1
|
Pabst G, Keller S. Exploring membrane asymmetry and its effects on membrane proteins. Trends Biochem Sci 2024; 49:333-345. [PMID: 38355393 DOI: 10.1016/j.tibs.2024.01.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2023] [Revised: 01/08/2024] [Accepted: 01/19/2024] [Indexed: 02/16/2024]
Abstract
Plasma membranes utilize free energy to maintain highly asymmetric, non-equilibrium distributions of lipids and proteins between their two leaflets. In this review we discuss recent progress in quantitative research enabled by using compositionally controlled asymmetric model membranes. Both experimental and computational studies have shed light on the nuanced mechanisms that govern the structural and dynamic coupling between compositionally distinct bilayer leaflets. This coupling can increase the membrane bending rigidity and induce order - or lipid domains - across the membrane. Furthermore, emerging evidence indicates that integral membrane proteins not only respond to asymmetric lipid distributions but also exhibit intriguing asymmetric properties themselves. We propose strategies to advance experimental research, aiming for a deeper, quantitative understanding of membrane asymmetry, which carries profound implications for cellular physiology.
Collapse
Affiliation(s)
- Georg Pabst
- Biophysics, Institute of Molecular Bioscience (IMB), NAWI Graz, University of Graz, Graz 8010, Austria; BioTechMed-Graz, Graz, Austria; Field of Excellence BioHealth, University of Graz, Graz, Austria.
| | - Sandro Keller
- Biophysics, Institute of Molecular Bioscience (IMB), NAWI Graz, University of Graz, Graz 8010, Austria; BioTechMed-Graz, Graz, Austria; Field of Excellence BioHealth, University of Graz, Graz, Austria
| |
Collapse
|
2
|
Cigler P, Moré G, Bize P, Meier CM, Frey CF, Basso W, Keller S. Trypanosomiasis: An emerging disease in Alpine swift ( Tachymarptis melba) nestlings in Switzerland? Int J Parasitol Parasites Wildl 2024; 23:100895. [PMID: 38187443 PMCID: PMC10767487 DOI: 10.1016/j.ijppaw.2023.100895] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2023] [Revised: 12/05/2023] [Accepted: 12/06/2023] [Indexed: 01/09/2024]
Abstract
Alpine swifts (Tachymarptis melba) are sub-Saharan migratory birds, which, in Switzerland, nest in colonies that have been continuously monitored for over 40 years. In the summer of 2022, despite favourable environmental conditions, an unexpectedly high number of sudden mortalities (30-80%) occurred in 20 to 45-day-old nestlings from several nesting sites, of which 3 were monitored in detail. Nestlings submitted for post-mortem analysis (n = 5) were in good body condition but exhibited extensive subcutaneous haematomas (n = 5), myocardial petechiae (n = 2) and stunted growth of primary feathers (n = 1). In all birds, 4-5 μm large, amastigote-like protozoans were identified in skeletal and cardiac muscle sections. These tissues tested positive in a PCR targeting the 18S-rRNA gene of Trypanosoma spp. Amplified sequences showed 99.63% identity with sequences of Trypanosoma corvi (JN006854 and AY461665) and Trypanosoma sp. (AJ620557, JN006841). 72 blood smears of 45-day-old nestlings from two colonies were assessed, of which 20 contained trypomastigote forms, some with high parasitaemia (highest average of 56.4 in 10 high power fields, 400x magnification). Trypomastigote morphometrics (n = 36; mean total length = 30.0 μm; length of free flagellum = 5.8 μm) were consistent with those of T. bouffardi. These findings suggest that an avian trypanosomiasis causing mass nestling mortality could be an emerging disease in Swiss Alpine swift populations.
Collapse
Affiliation(s)
- P Cigler
- Institute for Fish and Wildlife Health, University of Bern, Länggassstrasse 122, 3012 Bern, Switzerland
| | - G Moré
- Institute of Parasitology, University of Bern, Länggassstrasse 122, 3012 Bern, Switzerland
| | - P Bize
- Swiss Ornithological Institute, Seerose 1, 6204 Sempach, Switzerland
| | - C M Meier
- Swiss Ornithological Institute, Seerose 1, 6204 Sempach, Switzerland
| | - C F Frey
- Institute of Parasitology, University of Bern, Länggassstrasse 122, 3012 Bern, Switzerland
| | - W Basso
- Institute of Parasitology, University of Bern, Länggassstrasse 122, 3012 Bern, Switzerland
| | - S Keller
- Institute for Fish and Wildlife Health, University of Bern, Länggassstrasse 122, 3012 Bern, Switzerland
| |
Collapse
|
3
|
Dürig JN, Schulze C, Bosse M, Penk A, Huster D, Keller S, Rademann J. Dimerization and Crowding in the Binding of Interleukin 8 to Dendritic Glycosaminoglycans as Artificial Proteoglycans. Chemistry 2024; 30:e202302758. [PMID: 38010268 DOI: 10.1002/chem.202302758] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2023] [Revised: 11/20/2023] [Accepted: 11/21/2023] [Indexed: 11/29/2023]
Abstract
The interactions of glycosaminoglycans (GAG) with proteins of the extracellular matrix govern and regulate complex physiological functions including cellular growth, immune response, and inflammation. Repetitive presentation of GAG binding motifs, as found in native proteoglycans, might enhance GAG-protein binding through multivalent interactions. Here, we report the chemical synthesis of dendritic GAG oligomers constructed of nonasulfated hyaluronan tetrasaccharides for investigating the binding of the protein chemokine interleukin 8 (IL-8) to artificial, well-defined proteoglycan architectures. Binding of mutant monomeric and native dimerizable IL-8 was investigated by NMR spectroscopy and isothermal titration calorimetry. Dendritic oligomerization of GAG increased the binding affinity of both monomeric and dimeric IL-8. Monomeric IL-8 bound to monomeric and dimeric GAG with KD values of 7.3 and 0.108 μM, respectively. The effect was less pronounced for dimerizable wild-type IL-8, for which GAG dimerization improved the affinity from 34 to 5 nM. Binding of dimeric IL-8 to oligomeric GAG was limited by steric crowding effects, strongly reducing the affinity of subsequent binding events. In conclusion, the strongest effect of GAG oligomerization was the amplified binding of IL-8 monomers, which might concentrate monomeric protein in the extracellular matrix and thus promote protein dimerization under physiological conditions.
Collapse
Affiliation(s)
- Jan-Niklas Dürig
- Institute of Pharmacy - Medicinal Chemistry, Freie Universität Berlin, Königin-Luise-Str. 2+4, 14195, Berlin, Germany) Corresponding author
| | - Christian Schulze
- Institute of Medical Physics and Biophysics, Leipzig University, Härtelstr. 16/18, 04107, Leipzig, Germany
| | - Mathias Bosse
- Institute of Medical Physics and Biophysics, Leipzig University, Härtelstr. 16/18, 04107, Leipzig, Germany
| | - Anja Penk
- Institute of Medical Physics and Biophysics, Leipzig University, Härtelstr. 16/18, 04107, Leipzig, Germany
| | - Daniel Huster
- Institute of Medical Physics and Biophysics, Leipzig University, Härtelstr. 16/18, 04107, Leipzig, Germany
| | - Sandro Keller
- Biophysics, Institute of Molecular Biosciences (IMB), NAWI Graz, Field of Excellence BioHealth, BioTechMed-Graz, University of Graz, Humboldtstr. 50/III, 8010, Graz, Austria
| | - Jörg Rademann
- Institute of Pharmacy - Medicinal Chemistry, Freie Universität Berlin, Königin-Luise-Str. 2+4, 14195, Berlin, Germany) Corresponding author
| |
Collapse
|
4
|
Kiy Z, Chaud J, Xu L, Brandhorst E, Kamali T, Vargas C, Keller S, Hong H, Specht A, Cambridge S. Towards a Light-mediated Gene Therapy for the Eye using Caged Ethinylestradiol and the Inducible Cre/lox System. Angew Chem Int Ed Engl 2024; 63:e202317675. [PMID: 38127455 DOI: 10.1002/anie.202317675] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2023] [Revised: 12/14/2023] [Accepted: 12/15/2023] [Indexed: 12/23/2023]
Abstract
Increasingly, retinal pathologies are being treated with virus-mediated gene therapies. To be able to target viral transgene expression specifically to the pathological regions of the retina with light, we established an in vivo photoactivated gene expression paradigm for retinal tissue. Based on the inducible Cre/lox system, we discovered that ethinylestradiol is a suitable alternative to Tamoxifen as ethinylestradiol is more amenable to modification with photosensitive protecting compounds, i.e., "caging." Identification of ethinylestradiol as a ligand for the mutated human estradiol receptor was supported by in silico binding studies showing the reduced binding of caged ethinylestradiol. Caged ethinylestradiol was injected into the eyes of double transgenic GFAP-CreERT2 mice with a Cre-dependent tdTomato reporter transgene followed by irradiation with light of 450 nm. Photoactivation significantly increased retinal tdTomato expression compared to controls. We thus demonstrated a first step towards the development of a targeted, light-mediated gene therapy for the eyes.
Collapse
Affiliation(s)
- Zoe Kiy
- Heidelberg University, 69120, Heidelberg, Germany
| | - Juliane Chaud
- Laboratoire de Conception et Application de Molécules Bioactives, Equipe de Chimie et Neurobiologie Moléculaire, Université de Strasbourg, CNRS, CAMB UMR 7199, 67000, Strasbourg, France
| | - Liang Xu
- Division of Bioinformatics and Biostatistics, National Center for Toxicological Research, U.S. Food and Drug Administration, 3900 NCTR Road, Jefferson, AR, 72079, USA
| | - Eric Brandhorst
- Sektion Endokrinologie, Medizinische Fakultät Mannheim, 68167, Mannheim, Germany
| | - Tschackad Kamali
- Heidelberg Engineering GmbH, Max-Jarecki-Straße 8, 69115, Heidelberg, Germany
| | - Carolyn Vargas
- Biophysics, Institute of Molecular Biosciences (IMB), NAWI Graz, University of Graz, Humboldtstr. 50/III, 8010, Graz, Austria
- BioTechMed-Graz, Graz, Austria
- Field of Excellence BioHealth, University of Graz, Graz, Austria
| | - Sandro Keller
- Biophysics, Institute of Molecular Biosciences (IMB), NAWI Graz, University of Graz, Humboldtstr. 50/III, 8010, Graz, Austria
- BioTechMed-Graz, Graz, Austria
- Field of Excellence BioHealth, University of Graz, Graz, Austria
| | - Huixiao Hong
- Division of Bioinformatics and Biostatistics, National Center for Toxicological Research, U.S. Food and Drug Administration, 3900 NCTR Road, Jefferson, AR, 72079, USA
| | - Alexandre Specht
- Laboratoire de Conception et Application de Molécules Bioactives, Equipe de Chimie et Neurobiologie Moléculaire, Université de Strasbourg, CNRS, CAMB UMR 7199, 67000, Strasbourg, France
| | - Sidney Cambridge
- Heidelberg University, 69120, Heidelberg, Germany
- Institute for Anatomy II, Dr. Senckenberg Anatomy, Goethe-University Frankfurt am Main, 60590, Frankfurt am Main, Germany
| |
Collapse
|
5
|
Scherhag A, Räschle M, Unbehend N, Venn B, Glueck D, Mühlhaus T, Keller S, Pérez Patallo E, Zehner S, Frankenberg-Dinkel N. Characterization of a soluble library of the Pseudomonas aeruginosa PAO1 membrane proteome with emphasis on c-di-GMP turnover enzymes. Microlife 2023; 4:uqad028. [PMID: 37441524 PMCID: PMC10335732 DOI: 10.1093/femsml/uqad028] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/31/2023] [Revised: 04/28/2023] [Accepted: 05/30/2023] [Indexed: 07/15/2023]
Abstract
Studies of protein-protein interactions in membranes are very important to fully understand the biological function of a cell. The extraction of proteins from the native membrane environment is a critical step in the preparation of membrane proteins that might affect the stability of protein complexes. In this work, we used the amphiphilic diisobutylene/maleic acid copolymer to extract the membrane proteome of the opportunistic pathogen Pseudomonas aeruginosa, thereby creating a soluble membrane-protein library within a native-like lipid-bilayer environment. Size fractionation of nanodisc-embedded proteins and subsequent mass spectrometry enabled the identification of 3358 proteins. The native membrane-protein library showed a very good overall coverage compared to previous proteome data. The pattern of size fractionation indicated that protein complexes were preserved in the library. More than 20 previously described complexes, e.g. the SecYEG and Pili complexes, were identified and analyzed for coelution. Although the mass-spectrometric dataset alone did not reveal new protein complexes, combining pulldown assays with mass spectrometry was successful in identifying new protein interactions in the native membrane-protein library. Thus, we identified several candidate proteins for interactions with the membrane phosphodiesterase NbdA, a member of the c-di-GMP network. We confirmed the candidate proteins CzcR, PA4200, SadC, and PilB as novel interaction partners of NbdA using the bacterial adenylate cyclase two-hybrid assay. Taken together, this work demonstrates the usefulness of the native membrane-protein library of P. aeruginosa for the investigation of protein interactions and membrane-protein complexes. Data are available via ProteomeXchange with identifiers PXD039702 and PXD039700.
Collapse
Affiliation(s)
- Anna Scherhag
- Department of Microbiology, RPTU Kaiserslautern-Landau, Kaiserslautern 67655, Germany
| | - Markus Räschle
- Department of Molecular Genetics, RPTU Kaiserslautern-Landau, Kaiserslautern 67655, Germany
| | - Niklas Unbehend
- Department of Microbiology, RPTU Kaiserslautern-Landau, Kaiserslautern 67655, Germany
| | - Benedikt Venn
- Department of Computational Systems Biology, RPTU Kaiserslautern-Landau, Kaiserslautern 67655, Germany
| | - David Glueck
- Department of Biophysics, Institute of Molecular Biosciences (IMB), NAWI Graz, University of Graz, Graz 8010, Austria
- Department of Field of Excellence BioHealth, University of Graz, Graz 8010, Austria
- BioTechMed-Graz, Graz 8010, Austria
| | - Timo Mühlhaus
- Department of Computational Systems Biology, RPTU Kaiserslautern-Landau, Kaiserslautern 67655, Germany
| | - Sandro Keller
- Department of Biophysics, Institute of Molecular Biosciences (IMB), NAWI Graz, University of Graz, Graz 8010, Austria
- Department of Field of Excellence BioHealth, University of Graz, Graz 8010, Austria
- BioTechMed-Graz, Graz 8010, Austria
| | - Eugenio Pérez Patallo
- Department of Microbiology, RPTU Kaiserslautern-Landau, Kaiserslautern 67655, Germany
| | | | - Nicole Frankenberg-Dinkel
- Corresponding author. RPTU Kaiserslautern-Landau, Microbiology, Kaiserslautern 67655, Germany. E-mail:
| |
Collapse
|
6
|
Angerer N, Piller P, Semeraro EF, Keller S, Pabst G. Interaction of detergent with complex mimics of bacterial membranes. Biophys Chem 2023; 296:107002. [PMID: 36921495 DOI: 10.1016/j.bpc.2023.107002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2023] [Revised: 03/02/2023] [Accepted: 03/02/2023] [Indexed: 03/18/2023]
Abstract
Detergents are valuable tools to extract membrane proteins for biophysical, biochemical, and structural scrutiny. The detergent-driven solubilization of bilayers made from a single lipid species is commonly described in terms of pseudo-phase diagrams and a three-stage model accounting for three ranges comprising (i) intact vesicles, (ii) vesicle/micelle co-existence, or (iii) mixed micelles. Moreover, the pseudo-phase boundaries thus determined can often be quantitatively rationalized in terms of the molecular shapes of the lipid and the detergent used. Yet, it has remained unclear to what extent this approach can be applied to multi-component lipid membranes that more closely mimic the compositional complexity of cellular membranes. Here, we studied how lipid mixtures composed of palmitoyl oleoyl phosphatidylethanolamine (POPE), palmitoyl oleoyl phosphatidylglycerol (POPG), and tetraoleoyl cardiolipin (TOCL) are solubilized by the commonly used zwitterionic detergent lauryldimethylamine N-oxide using isothermal titration calorimetry. While phase diagrams of the diverse lipid mixtures showed the typical ranges of the three-stage model, we found that POPG-rich POPE/POPG bilayers are more difficult to solubilize than POPG-poor POPE/POPG bilayers. In turn, POPE/POPG/TOCL bilayers became increasingly resistant to detergent with increasing TOCL content. Since POPG is nearly cylindrically shaped and TOCL adopts inverted cone-like shapes under current buffer conditions, our solubilization data do not align with shape-based arguments. Instead, additional electrostatic interactions between lipids and detergents lead to non-additive mixing behavior affecting the resilience of complex lipid bilayers against solubilization.
Collapse
Affiliation(s)
- Nadine Angerer
- Biophysics, Institute of Molecular Bioscience (IMB), NAWI Graz, University of Graz, Humboldtstr. 50/III, Graz 8010, Austria; BioTechMed Graz, Graz, Austria; Field of Excellence BioHealth - University of Graz, Graz, Austria
| | - Paulina Piller
- Biophysics, Institute of Molecular Bioscience (IMB), NAWI Graz, University of Graz, Humboldtstr. 50/III, Graz 8010, Austria; BioTechMed Graz, Graz, Austria; Field of Excellence BioHealth - University of Graz, Graz, Austria
| | - Enrico F Semeraro
- Biophysics, Institute of Molecular Bioscience (IMB), NAWI Graz, University of Graz, Humboldtstr. 50/III, Graz 8010, Austria; BioTechMed Graz, Graz, Austria; Field of Excellence BioHealth - University of Graz, Graz, Austria
| | - Sandro Keller
- Biophysics, Institute of Molecular Bioscience (IMB), NAWI Graz, University of Graz, Humboldtstr. 50/III, Graz 8010, Austria; BioTechMed Graz, Graz, Austria; Field of Excellence BioHealth - University of Graz, Graz, Austria
| | - Georg Pabst
- Biophysics, Institute of Molecular Bioscience (IMB), NAWI Graz, University of Graz, Humboldtstr. 50/III, Graz 8010, Austria; BioTechMed Graz, Graz, Austria; Field of Excellence BioHealth - University of Graz, Graz, Austria.
| |
Collapse
|
7
|
Piller P, Semeraro EF, Rechberger GN, Keller S, Pabst G. Allosteric modulation of integral protein activity by differential stress in asymmetric membranes. PNAS Nexus 2023; 2:pgad126. [PMID: 37143864 PMCID: PMC10153742 DOI: 10.1093/pnasnexus/pgad126] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/01/2023] [Revised: 03/07/2023] [Accepted: 04/06/2023] [Indexed: 05/06/2023]
Abstract
The activity of integral membrane proteins is tightly coupled to the properties of the surrounding lipid matrix. In particular, transbilayer asymmetry, a hallmark of all plasma membranes, might be exploited to control membrane-protein activity. Here, we hypothesized that the membrane-embedded enzyme outer membrane phospholipase A (OmpLA) is susceptible to the lateral pressure differences that build up between such asymmetric membrane leaflets. Upon reconstituting OmpLA into synthetic, chemically well-defined phospholipid bilayers exhibiting different lateral pressure profiles, we indeed observed a substantial decrease in the enzyme's hydrolytic activity with increasing membrane asymmetry. No such effects were observed in symmetric mixtures of the same lipids. To quantitatively rationalize how the differential stress in asymmetric lipid bilayers inhibits OmpLA, we developed a simple allosteric model within the lateral pressure framework. Thus, we find that membrane asymmetry can serve as the dominant factor in controlling membrane-protein activity, even in the absence of specific, chemical cues or other physical membrane determinants such as hydrophobic mismatch.
Collapse
Affiliation(s)
- Paulina Piller
- Biophysics, Institute of Molecular Bioscience (IMB), NAWI Graz, University of Graz, Graz 8010, Austria
- BioTechMed Graz, Graz 8010, Austria
- Field of Excellence BioHealth—University of Graz, Graz 8010, Austria
| | - Enrico F Semeraro
- Biophysics, Institute of Molecular Bioscience (IMB), NAWI Graz, University of Graz, Graz 8010, Austria
- BioTechMed Graz, Graz 8010, Austria
- Field of Excellence BioHealth—University of Graz, Graz 8010, Austria
| | - Gerald N Rechberger
- Field of Excellence BioHealth—University of Graz, Graz 8010, Austria
- Biochemistry, Institute of Molecular Bioscience (IMB), NAWI Graz, University of Graz, Graz 8010, Austria
- Omics Center Graz, BioTechMed Graz, Graz 8010, Austria
| | - Sandro Keller
- Biophysics, Institute of Molecular Bioscience (IMB), NAWI Graz, University of Graz, Graz 8010, Austria
- BioTechMed Graz, Graz 8010, Austria
- Field of Excellence BioHealth—University of Graz, Graz 8010, Austria
| | | |
Collapse
|
8
|
Eggenreich L, Vargas C, Kolar C, Keller S. Lipid exchange among electroneutral Sulfo-DIBMA nanodiscs is independent of ion concentration. Biol Chem 2023:hsz-2022-0319. [PMID: 36921292 DOI: 10.1515/hsz-2022-0319] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2022] [Accepted: 02/21/2023] [Indexed: 03/17/2023]
Abstract
Polymer-encapsulated nanodiscs enable membrane proteins to be investigated within a native-like lipid-bilayer environment. Unlike other bilayer-based membrane mimetics, these nanodiscs are equilibrium structures that permit lipid exchange on experimentally relevant timescales. Therefore, examining the kinetics and mechanisms of lipid exchange is of great interest. Since the high charge densities of existing anionic polymers can interfere with protein-protein and protein-lipid interactions as well as charge-sensitive analysis techniques, electroneutral nanodisc-forming polymers have been recently introduced. However, it has remained unclear how the electroneutrality of these polymers affects the lipid-exchange behavior of the nanodiscs. Here, we use time-resolved Förster resonance energy transfer to study the kinetics and the mechanisms of lipid exchange among nanodiscs formed by the electroneutral polymer Sulfo-DIBMA. We also examine the role of coulombic repulsion and specific counterion association in lipid exchange. Our results show that Sulfo-DIBMA nanodiscs exchange lipids on a similar timescale as DIBMA nanodiscs. In contrast with nanodiscs made from polyanionic DIBMA, however, the presence of mono- and divalent cations does not influence lipid exchange among Sulfo-DIBMA nanodiscs, as expected from their electroneutrality. The robustness of Sulfo-DIBMA nanodiscs against varying ion concentrations opens new possibilities for investigating charge-sensitive processes involving membrane proteins.
Collapse
Affiliation(s)
- Loretta Eggenreich
- Biophysics, Institute of Molecular Biosciences (IMB), NAWI Graz, University of Graz, Humboldtstr. 50/III, A-8010 Graz, Austria.,Field of Excellence BioHealth, University of Graz, Graz, Austria.,BioTechMed-Graz, Graz, Austria
| | - Carolyn Vargas
- Biophysics, Institute of Molecular Biosciences (IMB), NAWI Graz, University of Graz, Humboldtstr. 50/III, A-8010 Graz, Austria.,Field of Excellence BioHealth, University of Graz, Graz, Austria.,BioTechMed-Graz, Graz, Austria
| | - Cenek Kolar
- Glycon Biochemicals GmbH, Im Biotechnologiepark TGZ 1, D-14943 Luckenwalde, Germany
| | - Sandro Keller
- Biophysics, Institute of Molecular Biosciences (IMB), NAWI Graz, University of Graz, Humboldtstr. 50/III, A-8010 Graz, Austria.,Field of Excellence BioHealth, University of Graz, Graz, Austria.,BioTechMed-Graz, Graz, Austria
| |
Collapse
|
9
|
Lenz J, Larsen AH, Keller S, Luchini A. Effect of Cholesterol on the Structure and Composition of Glyco-DIBMA Lipid Particles. Langmuir 2023; 39:3569-3579. [PMID: 36854196 PMCID: PMC10018766 DOI: 10.1021/acs.langmuir.2c03019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/04/2022] [Revised: 02/16/2023] [Indexed: 06/18/2023]
Abstract
Different amphiphilic co-polymers have been introduced to produce polymer-lipid particles with nanodisc structure composed of an inner lipid bilayer and polymer chains self-assembled as an outer belt. These particles can be used to stabilize membrane proteins in solution and enable their characterization by means of biophysical methods, including small-angle X-ray scattering (SAXS). Some of these co-polymers have also been used to directly extract membrane proteins together with their associated lipids from native membranes. Styrene/maleic acid and diisobutylene/maleic acid are among the most commonly used co-polymers for producing polymer-lipid particles, named SMALPs and DIBMALPs, respectively. Recently, a new co-polymer, named Glyco-DIBMA, was produced by partial amidation of DIBMA with the amino sugar N-methyl-d-glucosamine. Polymer-lipid particles produced with Glyco-DIBMA, named Glyco-DIBMALPs, exhibit improved structural properties and stability compared to those of SMALPs and DIBMALPs while retaining the capability of directly extracting membrane proteins from native membranes. Here, we characterize the structure and lipid composition of Glyco-DIBMALPs produced with either 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine (POPC) or 1,2-dimyristoyl-sn-glycero-3-phosphocholine (DMPC). Glyco-DIBMALPs were also prepared with mixtures of either POPC or DMPC and cholesterol at different mole fractions. We estimated the lipid content in the Glyco-DIBMALPs and determined the particle structure and morphology by SAXS. We show that the Glyco-DIBMALPs are nanodisc-like particles whose size and shape depend on the polymer/lipid ratio. This is relevant for designing nanodisc particles with a tunable diameter according to the size of the membrane protein to be incorporated. We also report that the addition of >20 mol % cholesterol strongly perturbed the formation of Glyco-DIBMALPs. Altogether, we describe a detailed characterization of the Glyco-DIBMALPs, which provides relevant inputs for future application of these particles in the biophysical investigation of membrane proteins.
Collapse
Affiliation(s)
- Julia Lenz
- Molecular
Biophysics, Technische Universität
Kaiserslautern, Erwin-Schrödinger-Strasse
13, 67663 Kaiserslautern, Germany
| | | | - Sandro Keller
- Biophysics,
Institute of Molecular Biosciences (IMB), NAWI Graz, University of Graz, Humboldtstrasse 50/III, 8010 Graz, Austria
- Field
of Excellence BioHealth, University of Graz, 8010 Graz, Austria
- BioTechMed-Graz, 8010 Graz, Austria
| | - Alessandra Luchini
- European
Spallation Source - ERIC, Partikel Gatan, Lund 224
84, Sweden
- Department
of Physics and Geology, University of Perugia, Via Alessandro Pascoli, 06123 Perugia, Italy
| |
Collapse
|
10
|
Jeblick T, Leisen T, Steidele CE, Albert I, Müller J, Kaiser S, Mahler F, Sommer F, Keller S, Hückelhoven R, Hahn M, Scheuring D. Botrytis hypersensitive response inducing protein 1 triggers noncanonical PTI to induce plant cell death. Plant Physiol 2023; 191:125-141. [PMID: 36222581 PMCID: PMC9806589 DOI: 10.1093/plphys/kiac476] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/02/2022] [Accepted: 09/20/2022] [Indexed: 05/28/2023]
Abstract
According to their lifestyle, plant pathogens are divided into biotrophic and necrotrophic organisms. Biotrophic pathogens exclusively nourish living host cells, whereas necrotrophic pathogens rapidly kill host cells and nourish cell walls and cell contents. To this end, the necrotrophic fungus Botrytis cinerea secretes large amounts of phytotoxic proteins and cell wall-degrading enzymes. However, the precise role of these proteins during infection is unknown. Here, we report on the identification and characterization of the previously unknown toxic protein hypersensitive response-inducing protein 1 (Hip1), which induces plant cell death. We found the adoption of a structurally conserved folded Alternaria alternata Alt a 1 protein structure to be a prerequisite for Hip1 to exert its necrosis-inducing activity in a host-specific manner. Localization and the induction of typical plant defense responses by Hip1 indicate recognition as a pathogen-associated molecular pattern at the plant plasma membrane. In contrast to other secreted toxic Botrytis proteins, the activity of Hip1 does not depend on the presence of the receptor-associated kinases BRI1-associated kinase 1 and suppressor of BIR1-1. Our results demonstrate that recognition of Hip1, even in the absence of obvious enzymatic or pore-forming activity, induces strong plant defense reactions eventually leading to plant cell death. Botrytis hip1 overexpression strains generated by CRISPR/Cas9 displayed enhanced infection, indicating the virulence-promoting potential of Hip1. Taken together, Hip1 induces a noncanonical defense response which might be a common feature of structurally conserved fungal proteins from the Alt a 1 family.
Collapse
Affiliation(s)
- Tanja Jeblick
- Plant Pathology, University of Kaiserslautern, Kaiserslautern 67663, Germany
| | - Thomas Leisen
- Plant Pathology, University of Kaiserslautern, Kaiserslautern 67663, Germany
| | - Christina E Steidele
- Phytopathology, TUM School of Life Sciences, Technical University of Munich, Freising 85354, Germany
| | - Isabell Albert
- Molecular Plant Physiology, FAU Erlangen, Erlangen 91058, Germany
| | - Jonas Müller
- Plant Pathology, University of Kaiserslautern, Kaiserslautern 67663, Germany
| | - Sabrina Kaiser
- Plant Pathology, University of Kaiserslautern, Kaiserslautern 67663, Germany
| | - Florian Mahler
- Molecular Biophysics, University of Kaiserslautern, Kaiserslautern 67663, Germany
| | - Frederik Sommer
- Molecular Biotechnology & Systems Biology, University of Kaiserslautern, Kaiserslautern 67663, Germany
| | - Sandro Keller
- Molecular Biophysics, University of Kaiserslautern, Kaiserslautern 67663, Germany
- Biophysics, Institute of Molecular Biosciences (IMB), NAWI Graz, University of Graz, Graz 8010, Austria
- Field of Excellence BioHealth, University of Graz, Graz, Austria
- BioTechMed-Graz, Graz, Austria
| | - Ralph Hückelhoven
- Phytopathology, TUM School of Life Sciences, Technical University of Munich, Freising 85354, Germany
| | - Matthias Hahn
- Plant Pathology, University of Kaiserslautern, Kaiserslautern 67663, Germany
| | | |
Collapse
|
11
|
Baron J, Bauernhofer L, Devenish SRA, Fiedler S, Ilsley A, Riedl S, Zweytick D, Glueck D, Pessentheiner A, Durand G, Keller S. FULL-MDS: Fluorescent Universal Lipid Labeling for Microfluidic Diffusional Sizing. Anal Chem 2022; 95:587-593. [PMID: 36574263 PMCID: PMC9850350 DOI: 10.1021/acs.analchem.2c03168] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Microfluidic diffusional sizing (MDS) is a recent and powerful method for determining the hydrodynamic sizes and interactions of biomolecules and nanoparticles. A major benefit of MDS is that it can report the size of a fluorescently labeled target even in mixtures with complex, unpurified samples. However, a limitation of MDS is that the target itself has to be purified and covalently labeled with a fluorescent dye. Such covalent labeling is not suitable for crude extracts such as native nanodiscs directly obtained from cellular membranes. In this study, we introduce fluorescent universal lipid labeling for MDS (FULL-MDS) as a sparse, noncovalent labeling method for determining particle size. We first demonstrate that the inexpensive and well-characterized fluorophore, Nile blue, spontaneously partitions into lipid nanoparticles without disrupting their structure. We then highlight the key advantage of FULL-MDS by showing that it yields robust size information on lipid nanoparticles in crude cell extracts that are not amenable to other sizing methods. Furthermore, even for synthetic nanodiscs, FULL-MDS is faster, cheaper, and simpler than existing labeling schemes.
Collapse
Affiliation(s)
- Jasmin Baron
- Biophysics,
Institute of Molecular Biosciences (IMB), NAWI Graz, University of Graz, Humboldtstr. 50/III, Graz 8010, Austria,Field
of Excellence BioHealth, University of Graz, Graz 8010, Austria,BioTechMed-Graz, Graz 8010, Austria
| | - Lena Bauernhofer
- Biophysics,
Institute of Molecular Biosciences (IMB), NAWI Graz, University of Graz, Humboldtstr. 50/III, Graz 8010, Austria,Field
of Excellence BioHealth, University of Graz, Graz 8010, Austria,BioTechMed-Graz, Graz 8010, Austria
| | - Sean R. A. Devenish
- The
Paddocks Business Centre, Fluidic Analytics
Ltd., Unit A, Cherry Hinton Road, Cambridge CB1 8DH, United Kingdom
| | - Sebastian Fiedler
- The
Paddocks Business Centre, Fluidic Analytics
Ltd., Unit A, Cherry Hinton Road, Cambridge CB1 8DH, United Kingdom
| | - Alison Ilsley
- The
Paddocks Business Centre, Fluidic Analytics
Ltd., Unit A, Cherry Hinton Road, Cambridge CB1 8DH, United Kingdom
| | - Sabrina Riedl
- Biophysics,
Institute of Molecular Biosciences (IMB), NAWI Graz, University of Graz, Humboldtstr. 50/III, Graz 8010, Austria,Field
of Excellence BioHealth, University of Graz, Graz 8010, Austria,BioTechMed-Graz, Graz 8010, Austria
| | - Dagmar Zweytick
- Biophysics,
Institute of Molecular Biosciences (IMB), NAWI Graz, University of Graz, Humboldtstr. 50/III, Graz 8010, Austria,Field
of Excellence BioHealth, University of Graz, Graz 8010, Austria,BioTechMed-Graz, Graz 8010, Austria
| | - David Glueck
- Biophysics,
Institute of Molecular Biosciences (IMB), NAWI Graz, University of Graz, Humboldtstr. 50/III, Graz 8010, Austria,Field
of Excellence BioHealth, University of Graz, Graz 8010, Austria,BioTechMed-Graz, Graz 8010, Austria
| | - Ariane Pessentheiner
- Biophysics,
Institute of Molecular Biosciences (IMB), NAWI Graz, University of Graz, Humboldtstr. 50/III, Graz 8010, Austria,Field
of Excellence BioHealth, University of Graz, Graz 8010, Austria,BioTechMed-Graz, Graz 8010, Austria
| | - Grégory Durand
- Equipe
Synthèse et Systèmes Colloïdaux Bio-organiques,
Unité Propre de Recherche et d’Innovation, Avignon Université, 301 rue Baruch de Spinoza, Avignon 84916 CEDEX 9, France,CHEM2STAB, 301 rue Baruch de Spinoza, Avignon 84916 CEDEX 9, France
| | - Sandro Keller
- Biophysics,
Institute of Molecular Biosciences (IMB), NAWI Graz, University of Graz, Humboldtstr. 50/III, Graz 8010, Austria,Field
of Excellence BioHealth, University of Graz, Graz 8010, Austria,BioTechMed-Graz, Graz 8010, Austria,
| |
Collapse
|
12
|
Janson K, Kyrilis FL, Tüting C, Alfes M, Das M, Träger TK, Schmidt C, Hamdi F, Vargas C, Keller S, Meister A, Kastritis PL. Cryo-Electron Microscopy Snapshots of Eukaryotic Membrane Proteins in Native Lipid-Bilayer Nanodiscs. Biomacromolecules 2022; 23:5084-5094. [PMID: 36399657 DOI: 10.1021/acs.biomac.2c00935] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
New technologies for purifying membrane-bound protein complexes in combination with cryo-electron microscopy (EM) have recently allowed the exploration of such complexes under near-native conditions. In particular, polymer-encapsulated nanodiscs enable the study of membrane proteins at high resolution while retaining protein-protein and protein-lipid interactions within a lipid bilayer. However, this powerful technology has not been exploited to address the important question of how endogenous─as opposed to overexpressed─membrane proteins are organized within a lipid environment. In this work, we demonstrate that biochemical enrichment protocols for native membrane-protein complexes from Chaetomium thermophilum in combination with polymer-based lipid-bilayer nanodiscs provide a substantial improvement in the quality of recovered endogenous membrane-protein complexes. Mass spectrometry results revealed ∼1123 proteins, while multiple 2D class averages and two 3D reconstructions from cryo-EM data furnished prominent structural signatures. This integrated methodological approach to enriching endogenous membrane-protein complexes provides unprecedented opportunities for a deeper understanding of eukaryotic membrane proteomes.
Collapse
Affiliation(s)
- Kevin Janson
- Interdisciplinary Research Center HALOmem, Charles Tanford Protein Center, Martin Luther University Halle-Wittenberg, Kurt-Mothes-Straße 3a, Halle/Saale 06120, Germany
| | - Fotis L Kyrilis
- Interdisciplinary Research Center HALOmem, Charles Tanford Protein Center, Martin Luther University Halle-Wittenberg, Kurt-Mothes-Straße 3a, Halle/Saale 06120, Germany
| | - Christian Tüting
- Interdisciplinary Research Center HALOmem, Charles Tanford Protein Center, Martin Luther University Halle-Wittenberg, Kurt-Mothes-Straße 3a, Halle/Saale 06120, Germany
| | - Marie Alfes
- Interdisciplinary Research Center HALOmem, Charles Tanford Protein Center, Martin Luther University Halle-Wittenberg, Kurt-Mothes-Straße 3a, Halle/Saale 06120, Germany.,Institute of Biochemistry and Biotechnology, Martin Luther University Halle-Wittenberg, Kurt-Mothes-Straße 3, Halle/Saale 06120, Germany
| | - Manabendra Das
- Molecular Biophysics, Technische Universität Kaiserslautern (TUK), Erwin-Schrödinger-Straße 13, Kaiserslautern 67663, Germany
| | - Toni K Träger
- Interdisciplinary Research Center HALOmem, Charles Tanford Protein Center, Martin Luther University Halle-Wittenberg, Kurt-Mothes-Straße 3a, Halle/Saale 06120, Germany.,Institute of Pharmacy, Martin Luther University Halle-Wittenberg, Kurt-Mothes-Straße 3, Halle/Saale 06120, Germany
| | - Carla Schmidt
- Interdisciplinary Research Center HALOmem, Charles Tanford Protein Center, Martin Luther University Halle-Wittenberg, Kurt-Mothes-Straße 3a, Halle/Saale 06120, Germany.,Institute of Biochemistry and Biotechnology, Martin Luther University Halle-Wittenberg, Kurt-Mothes-Straße 3, Halle/Saale 06120, Germany
| | - Farzad Hamdi
- Interdisciplinary Research Center HALOmem, Charles Tanford Protein Center, Martin Luther University Halle-Wittenberg, Kurt-Mothes-Straße 3a, Halle/Saale 06120, Germany
| | - Carolyn Vargas
- Molecular Biophysics, Technische Universität Kaiserslautern (TUK), Erwin-Schrödinger-Straße 13, Kaiserslautern 67663, Germany.,Biophysics, Institute of Molecular Bioscience (IMB), NAWI Graz, University of Graz, Humboldtstr. 50/III, Graz 8010, Austria.,Field of Excellence BioHealth, University of Graz, Graz 8010, Austria.,BioTechMed-Graz, Graz 8010, Austria
| | - Sandro Keller
- Molecular Biophysics, Technische Universität Kaiserslautern (TUK), Erwin-Schrödinger-Straße 13, Kaiserslautern 67663, Germany.,Biophysics, Institute of Molecular Bioscience (IMB), NAWI Graz, University of Graz, Humboldtstr. 50/III, Graz 8010, Austria.,Field of Excellence BioHealth, University of Graz, Graz 8010, Austria.,BioTechMed-Graz, Graz 8010, Austria
| | - Annette Meister
- Interdisciplinary Research Center HALOmem, Charles Tanford Protein Center, Martin Luther University Halle-Wittenberg, Kurt-Mothes-Straße 3a, Halle/Saale 06120, Germany.,Institute of Biochemistry and Biotechnology, Martin Luther University Halle-Wittenberg, Kurt-Mothes-Straße 3, Halle/Saale 06120, Germany
| | - Panagiotis L Kastritis
- Interdisciplinary Research Center HALOmem, Charles Tanford Protein Center, Martin Luther University Halle-Wittenberg, Kurt-Mothes-Straße 3a, Halle/Saale 06120, Germany.,Institute of Biochemistry and Biotechnology, Martin Luther University Halle-Wittenberg, Kurt-Mothes-Straße 3, Halle/Saale 06120, Germany
| |
Collapse
|
13
|
Glueck D, Grethen A, Das M, Mmeka OP, Patallo EP, Meister A, Rajender R, Kins S, Räschle M, Victor J, Chu C, Etzkorn M, Köck Z, Bernhard F, Babalola JO, Vargas C, Keller S. Electroneutral Polymer Nanodiscs Enable Interference-Free Probing of Membrane Proteins in a Lipid-Bilayer Environment. Small 2022; 18:e2202492. [PMID: 36228092 DOI: 10.1002/smll.202202492] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/21/2022] [Revised: 09/10/2022] [Indexed: 06/16/2023]
Abstract
Membrane proteins can be examined in near-native lipid-bilayer environments with the advent of polymer-encapsulated nanodiscs. These nanodiscs self-assemble directly from cellular membranes, allowing in vitro probing of membrane proteins with techniques that have previously been restricted to soluble or detergent-solubilized proteins. Often, however, the high charge densities of existing polymers obstruct bioanalytical and preparative techniques. Thus, the authors aim to fabricate electroneutral-yet water-soluble-polymer nanodiscs. By attaching a sulfobetaine group to the commercial polymers DIBMA and SMA(2:1), these polyanionic polymers are converted to the electroneutral maleimide derivatives, Sulfo-DIBMA and Sulfo-SMA(2:1). Sulfo-DIBMA and Sulfo-SMA(2:1) readily extract proteins and phospholipids from artificial and cellular membranes to form nanodiscs. Crucially, the electroneutral nanodiscs avert unspecific interactions, thereby enabling new insights into protein-lipid interactions through lab-on-a-chip detection and in vitro translation of membrane proteins. Finally, the authors create a library comprising thousands of human membrane proteins and use proteome profiling by mass spectrometry to show that protein complexes are preserved in electroneutral nanodiscs.
Collapse
Affiliation(s)
- David Glueck
- Molecular Biophysics, Technische Universität Kaiserslautern (TUK), Erwin-Schrödinger-Str. 13, 67663, Kaiserslautern, Germany
- Biophysics, Institute of Molecular Biosciences (IMB), NAWI Graz, University of Graz, Humboldtstr. 50/III, Graz, 8010, Austria
- Field of Excellence BioHealth, University of Graz, Graz, Austria
- BioTechMed-Graz, Graz, Austria
| | - Anne Grethen
- Molecular Biophysics, Technische Universität Kaiserslautern (TUK), Erwin-Schrödinger-Str. 13, 67663, Kaiserslautern, Germany
| | - Manabendra Das
- Molecular Biophysics, Technische Universität Kaiserslautern (TUK), Erwin-Schrödinger-Str. 13, 67663, Kaiserslautern, Germany
| | - Ogochukwu Patricia Mmeka
- Molecular Biophysics, Technische Universität Kaiserslautern (TUK), Erwin-Schrödinger-Str. 13, 67663, Kaiserslautern, Germany
- Department of Chemistry, University of Ibadan, Ibadan, 200284, Nigeria
| | - Eugenio Pérez Patallo
- Molecular Biophysics, Technische Universität Kaiserslautern (TUK), Erwin-Schrödinger-Str. 13, 67663, Kaiserslautern, Germany
| | - Annette Meister
- HALOmem and Institute of Biochemistry and Biotechnology, Martin Luther University Halle-Wittenberg, Kurt-Mothes-Str. 3a, 06120, Halle (Saale), Germany
| | - Ritu Rajender
- Human Biology, Technische Universität Kaiserslautern (TUK), Erwin-Schrödinger-Str. 13, 67663, Kaiserslautern, Germany
| | - Stefan Kins
- Human Biology, Technische Universität Kaiserslautern (TUK), Erwin-Schrödinger-Str. 13, 67663, Kaiserslautern, Germany
| | - Markus Räschle
- Molecular Genetics, Technische Universität Kaiserslautern (TUK), Paul-Ehrlich-Str. 24, 67663, Kaiserslautern, Germany
| | - Julian Victor
- Institut für Physikalische Biologie, Heinrich-Heine-Universität Düsseldorf, Universitätsstr. 1, 40225, Düsseldorf, Germany
| | - Ci Chu
- Institut für Physikalische Biologie, Heinrich-Heine-Universität Düsseldorf, Universitätsstr. 1, 40225, Düsseldorf, Germany
| | - Manuel Etzkorn
- Institut für Physikalische Biologie, Heinrich-Heine-Universität Düsseldorf, Universitätsstr. 1, 40225, Düsseldorf, Germany
| | - Zoe Köck
- Centre for Biomolecular Magnetic Resonance, Institute for Biophysical Chemistry, Goethe University of Frankfurt/Main, Max-von-Laue-Str. 9, 60438, Frankfurt/Main, Germany
| | - Frank Bernhard
- Centre for Biomolecular Magnetic Resonance, Institute for Biophysical Chemistry, Goethe University of Frankfurt/Main, Max-von-Laue-Str. 9, 60438, Frankfurt/Main, Germany
| | | | - Carolyn Vargas
- Molecular Biophysics, Technische Universität Kaiserslautern (TUK), Erwin-Schrödinger-Str. 13, 67663, Kaiserslautern, Germany
- Biophysics, Institute of Molecular Biosciences (IMB), NAWI Graz, University of Graz, Humboldtstr. 50/III, Graz, 8010, Austria
- Field of Excellence BioHealth, University of Graz, Graz, Austria
- BioTechMed-Graz, Graz, Austria
| | - Sandro Keller
- Molecular Biophysics, Technische Universität Kaiserslautern (TUK), Erwin-Schrödinger-Str. 13, 67663, Kaiserslautern, Germany
- Biophysics, Institute of Molecular Biosciences (IMB), NAWI Graz, University of Graz, Humboldtstr. 50/III, Graz, 8010, Austria
- Field of Excellence BioHealth, University of Graz, Graz, Austria
- BioTechMed-Graz, Graz, Austria
| |
Collapse
|
14
|
Jabbour S, Lee K, Frost N, Breder V, Kowalski D, Levchenko E, Reguart N, Martinez-Marti A, Houghton B, Paoli J, Safina S, Komiya T, Sanford A, Liu H, Song A, Keller S, Reck M. Pembrolizumab plus Concurrent Chemoradiation Therapy (cCRT) for Unresectable, Locally Advanced, Stage III NSCLC: KEYNOTE-799 2-Year Update. Int J Radiat Oncol Biol Phys 2022. [DOI: 10.1016/j.ijrobp.2022.07.383] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
|
15
|
Lee HS, Das M, Mahler F, Ahmed W, Wang H, Mortensen JS, Hariharan P, Ghani L, Byrne B, Guan L, Loland CJ, Keller S, Chae PS. 3,4-Bis(hydroxymethyl)hexane-1,6-diol-based maltosides (HDMs) for membrane-protein study: Importance of detergent rigidity-flexibility balance in protein stability. Chem Asian J 2022; 17:e202200941. [PMID: 36253323 DOI: 10.1002/asia.202200941] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2022] [Revised: 10/14/2022] [Indexed: 11/07/2022]
Abstract
Detergents have been major contributors to membrane-protein structural study for decades. However, membrane proteins solubilized in conventional detergents tend to aggregate or denature over time. Stability of large eukaryotic membrane proteins with complex structures tends to be worse, necessitating development of novel detergents with improved properties. Here, we prepared a novel class of detergents, designated 3,4-bis(hydroxymethyl)hexane-1,6-diol-based maltosides (HDMs). When tested on three membrane proteins, including two G-protein-coupled receptors (GPCRs), the new detergents displayed significantly better behaviors compared with DDM. Moreover, the HDMs were superior or comparable to LMNG, an amphiphile widely used for GPCR structural study. An optimal balance of detergent rigidity vs. flexibility of the HDMs is likely responsible for their favorable behaviors toward membrane-protein stability. Thus, the current study not only introduces the HDMs, with significant potential for membrane-protein structural study, but also suggests a useful guideline for designing novel detergents for membrane-protein research.
Collapse
Affiliation(s)
- Hyun Sung Lee
- Hanyang University - ERICA Campus: Hanyang University - Ansan Campus, Bionanotechnology, 55, Hanyangdaehak-ro, Sangnok-gu, the 1st engineering building # 232, 15588, Ansan-si, KOREA, REPUBLIC OF
| | - Manabendra Das
- Technische Universitat Kaiserslautern, Molecular Biophysics, GERMANY
| | - Florian Mahler
- Technische Universitat Kaiserslautern, Molecular Biophysics, GERMANY
| | - Waqar Ahmed
- Hanyang University - ERICA Campus: Hanyang University - Ansan Campus, Bionano Technology, KOREA, REPUBLIC OF
| | - Haoqing Wang
- Stanford University, Molecular and Cellular Physiology, UNITED STATES
| | - Jonas S Mortensen
- University of Copenhagen: Kobenhavns Universitet, Neuroscience, DENMARK
| | - Parameswaran Hariharan
- Texas Tech University Health Sciences Center School of Medicine - Lubbock Campus: Texas Tech University Health Sciences Center School of Medicine, Cell Physiology and Molecular Biophysics, UNITED STATES
| | - Lubna Ghani
- Hanyang University - ERICA Campus: Hanyang University - Ansan Campus, Bionano Technology, KOREA, REPUBLIC OF
| | | | - Lan Guan
- Texas Tech University Health Sciences Center School of Medicine - Lubbock Campus: Texas Tech University Health Sciences Center School of Medicine, Cell Physiology and Molecular Biophysics, UNITED STATES
| | - Claus J Loland
- University of Copenhagen: Kobenhavns Universitet, Neuroscience, DENMARK
| | - Sandro Keller
- University of Graz: Karl-Franzens-Universitat Graz, Biophysics, AUSTRIA
| | - Pil Seok Chae
- Hanyang University, Department of Bionano Engineering, 55 Hanyangdaehak-ro, 15588, Ansan, KOREA, REPUBLIC OF
| |
Collapse
|
16
|
N’Dow J, Smith E, Polychronopoulos K, Cannon A, Roobol M, Auweter S, Thomas M, Kremer A, De Meulder B, Dellamonica D, Alhambra D, Asiimwe A, Bussmann M, Ji X, Torremante P, Keller S, Kube F, Krueger H. 917P OPTIMA: Improve care for patients with prostate, breast, and lung cancer through artificial intelligence. Ann Oncol 2022. [DOI: 10.1016/j.annonc.2022.07.1042] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
|
17
|
Ramanan A, Quartier P, Okamoto N, Meszaros G, Araujo J, Wang Z, Liao R, Crowe B, Zhang X, Decker R, Keller S, Brunner H, Ruperto N. LB0002 BARICITINIB IN JUVENILE IDIOPATHIC ARTHRITIS: A PHASE 3, DOUBLE-BLIND, PLACEBO-CONTROLLED, WITHDRAWAL, EFFICACY AND SAFETY STUDY. Ann Rheum Dis 2022. [DOI: 10.1136/annrheumdis-2022-eular.5091a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
BackgroundBaricitinib is a JAK1/2 selective inhibitor approved for the treatment of rheumatoid arthritis. Juvenile idiopathic arthritis (JIA) is a group of diseases characterized by immune mediated chronic arthritis which often requires treatment with conventional synthetic or biologic disease-modifying antirheumatic drugs (cs or b-DMARDs).ObjectivesTo investigate baricitinib efficacy and safety in pediatric patients with JIA and an inadequate response to cs or b-DMARDs.MethodsThis Phase 3 multicenter, double-blind, withdrawal, efficacy, and safety study, enrolled patients (pts) age 2 to <18 years with extended oligo- or poly-articular JIA, ERA, or JPsA, per ILAR criteria, and an inadequate response to ≥1 cs and/or b-DMARDs (NCT03773978). There were 3 periods: a 2-week (wk) pharmacokinetic/safety assessment (PKS), a 12-wk open-label lead-in (OLLI), and an up-to 32-wk double-blind withdrawal (DBW). Dosage and safety were confirmed in the PKS and then pts, including those from the PKS, enrolled in the OLLI, receiving age-based, oral, once daily doses of baricitinib. Pts with a JIA-ACR30 response at wk12, end of OLLI, entered the DBW to be randomized 1:1 to continued baricitinib or newly started placebo (PBO) and remained until flare or up to wk32. Primary endpoint was time to flare during the DBW. Secondary endpoints included JIA-ACR30/50/70/90 response rates at wk12, and proportion of pts with a flare during the DBW. Survival curves were estimated using the Kaplan-Meier method.ResultsOf 220 pts enrolled, 29 participated in the PKS, 219 entered the OLLI, and 163 entered the DBW. The JIA-ACR30/50/70/90 response at wk12 was 76.3%/63.5%/46.1%/20.1%, respectively. During the DBW, time of flare was significantly shorter with PBO vs baricitinib (hazard ratio 0.24 [95% CI 0.13,0.45], p<0.001; Figure 1). The proportion of pts with a flare during the DBW was significantly lower for baricitinib vs PBO (14 (17.1%) vs. 41 (50.6%), p<0.001). In the PKS and OLLI periods, 126 (57.3%) pts reported ≥1 treatment emergent adverse event (TEAE), while 6 (2.7%) reported ≥1 serious adverse event (SAE); Table 1. In the DBW, 38 (46.9%) and 54 (65.9%) pts reported ≥1 TEAE for PBO and baricitinib, respectively, whereas those with ≥1 SAE were 3 (3.7%) and 4 (4.9%). The mean wks of exposure was higher in the baricitinib vs PBO group during DBW (26.34 vs 18.91) due to study design. There were no deaths, cardiovascular events or uveitis and 1 case of herpes zoster.
Table 1.Safety dataEvents, N (%)PKS and OLLI (N=220)Events, N (%)DBW Placebo (N=81)DBW Baricitinib (N=82)Discontinuations due to AEs2 (0.9)2 (2.5)1 (1.2)TEAEs126 (57.3)38 (46.9)54 (65.9)most common TEAEsNasopharyngitis19 (8.6)URTI1 (1.2)9 (11.0)Headache14 (6.4)Headache3 (3.7)9 (11.0)Arthralgia12 (5.5)Nasopharyngitis3 (3.7)6 (7.3)URTI11 (5.0)Arthralgia3 (3.7)6 (7.3)Nausea11 (5.0)Oropharyngeal pain1 (1.2)5 (6.1)SAEs6 (2.7)3 (3.7)4 (4.9)All reported SAEsArthralgia1 (0.5)COVID-1901 (1.2)Joint Destruction1 (0.5)Gastroenteritis01 (1.2)Joint Effusion1 (0.5)Headache01 (1.2)JIA1 (0.5)Pulmonary Embolism01 (1.2)Musculoskeletal Chest Pain1 (0.5)Bronchospasm1 (1.2)0Decreased Appetite1 (0.5)JIA1 (1.2)0Suicide Attempt1 (1.2)0Potential opportunistic infections2 (0.9)1 (1.2)1 (1.2)Herpes virus1 (0.5)Herpes virus1 (1.2)0Herpes zoster1 (0.5)Candida01 (1.2)URTI= Upper Respiratory Tract InfectionConclusionBaricitinib significantly reduced time to and frequency of JIA flares in pts with JIA versus PBO, and improved JIA-ACR scores in the majority of pts within 12wks. Safety findings were consistent with the known safety profile in adult rheumatoid arthritis indications. These findings support baricitinib as a treatment for signs and symptoms of JIA with an inadequate response to cs or b-DMARDs.References[1]Giannini EH, et. al. Preliminary definition of improvement in juvenile arthritis. Arthritis Rheum 1997; 40: 1202-1209.[2]Brunner HI, et. al. Preliminary definition of disease flare in juvenile rheumatoid arthritis. J Rheumatol 2002; 29(5):1058-64.Disclosure of InterestsAthimalaipet Ramanan Consultant of: Eli Lilly and Company, Abbvie, Roche, UCB, Novartis, Pfizer, and Sobi, Grant/research support from: Eli Lilly and Company, Pierre Quartier Consultant of: Eli Lilly and Company, Abbvie, Amgen, BMS, Novartis, Novimmune, Pfizer, Swedish Orphan Biovitrum, SANOFI, Speakers bureau: Abbvie, Novartis, Pfizer, Swedish Orphan Biovitrum, Nami Okamoto Consultant of: Swedish Orphan Biovitrum, Eli Lilly and Company, Speakers bureau: AbbVie, Eli Lilly and Company, Sanofi, Asahi Kasei Medical, Mitsubishi Tanabe Pharma, Bristol Myers Squibb, Pfizer Japan, Ayumi Pharma, Eisai, Torii Pharma, GlaxoSmithKline, Kyorin Pharma, Novartis, Chugai Pharmaceutical, Teijin Pharma, Gabriella Meszaros Employee of: Eli Lilly and Company, Joana Araujo Employee of: Eli Lilly and Company, Zhongkai Wang Employee of: Eli Lilly and Company, Ran Liao Employee of: Eli Lilly and Company, Brenda Crowe Employee of: Eli Lilly and Company, Xin Zhang Employee of: Eli Lilly and Company, Rodney Decker Employee of: Eli Lilly and Company, Stuart Keller Employee of: Eli Lilly and Company, Hermine Brunner Consultant of: AbbVie, Astra Zeneca-Medimmune, Biogen, Boehringer, Bristol-Myers Squibb, Celgene, Eli Lilly, EMD Serono, Idorsia, Cerocor, Janssen, GlaxoSmithKline, F. Hoffmann-La Roche, Merck, Novartis, R-Pharm, Sanofi, Speakers bureau: Novartis, Pfizer, GlaxoSmithKline, Nicolino Ruperto Consultant of: Eli Lilly and Company, Ablynx, Amgen, Astrazeneca-Medimmune, Aurinia, Bayer, Bristol Myers and Squibb, Cambridge Healthcare Research (CHR), Celgene, Domain therapeutic, Eli-Lilly, EMD Serono, Glaxo Smith and Kline, Idorsia, Janssen, Novartis, Pfizer, Sobi, UCB, Speakers bureau: Eli Lilly and Company, Glaxo Smith and Kline, Pfizer, Sobi, UCB
Collapse
|
18
|
Danielczak B, Rasche M, Lenz J, Pérez Patallo E, Weyrauch S, Mahler F, Agbadaola MT, Meister A, Babalola JO, Vargas C, Kolar C, Keller S. A bioinspired glycopolymer for capturing membrane proteins in native-like lipid-bilayer nanodiscs. Nanoscale 2022; 14:1855-1867. [PMID: 35040850 DOI: 10.1039/d1nr03811g] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Amphiphilic copolymers that directly extract membrane proteins and lipids from cellular membranes to form nanodiscs combine the advantages of harsher membrane mimics with those of a native-like membrane environment. Among the few commercial polymers that are capable of forming nanodiscs, alternating diisobutylene/maleic acid (DIBMA) copolymers have gained considerable popularity as gentle and UV-transparent alternatives to aromatic polymers. However, their moderate hydrophobicities and high electric charge densities render all existing aliphatic copolymers rather inefficient under near-physiological conditions. Here, we introduce Glyco-DIBMA, a bioinspired glycopolymer that possesses increased hydrophobicity and reduced charge density but nevertheless retains excellent solubility in aqueous solutions. Glyco-DIBMA outperforms established aliphatic copolymers in that it solubilizes lipid vesicles of various compositions much more efficiently, thereby furnishing smaller, more narrowly distributed nanodiscs that preserve a bilayer architecture and exhibit rapid lipid exchange. We demonstrate the superior performance of Glyco-DIBMA in preparative and analytical applications by extracting a broad range of integral membrane proteins from cellular membranes and further by purifying a membrane-embedded voltage-gated K+ channel, which was fluorescently labeled and analyzed with the aid of microfluidic diffusional sizing (MDS) directly within native-like lipid-bilayer nanodiscs.
Collapse
Affiliation(s)
- Bartholomäus Danielczak
- Molecular Biophysics, Technische Universität Kaiserslautern (TUK), Erwin-Schrödinger-Str. 13, 67663 Kaiserslautern, Germany
| | - Marie Rasche
- Glycon Biochemicals GmbH, Im Biotechnologiepark TGZ 1, 14943 Luckenwalde, Germany
| | - Julia Lenz
- Molecular Biophysics, Technische Universität Kaiserslautern (TUK), Erwin-Schrödinger-Str. 13, 67663 Kaiserslautern, Germany
| | - Eugenio Pérez Patallo
- Molecular Biophysics, Technische Universität Kaiserslautern (TUK), Erwin-Schrödinger-Str. 13, 67663 Kaiserslautern, Germany
| | - Sophie Weyrauch
- Molecular Biophysics, Technische Universität Kaiserslautern (TUK), Erwin-Schrödinger-Str. 13, 67663 Kaiserslautern, Germany
| | - Florian Mahler
- Molecular Biophysics, Technische Universität Kaiserslautern (TUK), Erwin-Schrödinger-Str. 13, 67663 Kaiserslautern, Germany
| | - Michael Tope Agbadaola
- Molecular Biophysics, Technische Universität Kaiserslautern (TUK), Erwin-Schrödinger-Str. 13, 67663 Kaiserslautern, Germany
- Department of Chemistry, University of Ibadan, 200284, Ibadan, Nigeria
| | - Annette Meister
- Institute of Biochemistry and Biotechnology, and ZIK HALOmem, Martin Luther University Halle-Wittenberg, Kurt-Mothes-Str. 3a, 06120 Halle (Saale), Germany
| | | | - Carolyn Vargas
- Molecular Biophysics, Technische Universität Kaiserslautern (TUK), Erwin-Schrödinger-Str. 13, 67663 Kaiserslautern, Germany
- Biophysics, Institute of Molecular Biosciences (IMB), NAWI Graz, University of Graz, Humboldtstr. 50/III, 8010 Graz, Austria.
- Field of Excellence BioHealth, University of Graz, Graz, Austria
- BioTechMed-Graz, Graz, Austria
| | - Cenek Kolar
- Glycon Biochemicals GmbH, Im Biotechnologiepark TGZ 1, 14943 Luckenwalde, Germany
| | - Sandro Keller
- Molecular Biophysics, Technische Universität Kaiserslautern (TUK), Erwin-Schrödinger-Str. 13, 67663 Kaiserslautern, Germany
- Biophysics, Institute of Molecular Biosciences (IMB), NAWI Graz, University of Graz, Humboldtstr. 50/III, 8010 Graz, Austria.
- Field of Excellence BioHealth, University of Graz, Graz, Austria
- BioTechMed-Graz, Graz, Austria
| |
Collapse
|
19
|
Lee J, Roux S, Le Roux E, Keller S, Rega B, Bonazzi C. Unravelling caramelization and Maillard reactions in glucose and glucose + leucine model cakes: Formation and degradation kinetics of precursors, α-dicarbonyl intermediates and furanic compounds during baking. Food Chem 2021; 376:131917. [PMID: 34968913 DOI: 10.1016/j.foodchem.2021.131917] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2021] [Revised: 12/08/2021] [Accepted: 12/19/2021] [Indexed: 11/04/2022]
Abstract
Understanding the mechanisms leading to the multitude of newly-formed compounds generated during the thermal processing of food is important for the reasoned construction of quality. Thanks to a solid food model with a structure and technological history comparable to that of a real sponge cake and containing only known amounts of precursors (glucose with or without leucine), an adapted reaction scheme unravelling Maillard and caramelization reactions was built and then compared to experimental kinetic data measured on numerous reaction markers (precursors, α-dicarbonyl intermediates and furanic compounds). For caramelization, this study showed that glucose mainly formed 1,2-enediol and then fructose rather than glucosone and glyoxal. 5-hydroxymethylfurfural started to form when there were sufficient quantities of fructose, and 3,4-dideoxyoglucosone was not generated until after this step. Furfural was mainly formed via 3-deoxyglucosone. The involvement of leucine tended to accelerate the breakdown of sugars as more degradation pathways (via enaminols) were added.
Collapse
Key Words
- 1deoxyglucosone (PubChem CID: 11228966, IUPAC name: (4R,5R)4,5,6trihydroxyhexane2,3dione)
- 3,4dideoxyglucosone (PubChem CID: 132520491, IUPAC name: (5R)5,6dihydroxy2oxohexanal)
- 3deoxyglucosone (PubChem CID: 114839, IUPAC name: (4S,5R)4,5,6trihydroxy2oxohexanal)
- 5-Hydroxymethylfurfural
- 5hydroxymethylfurfural (PubChem CID: 237332, IUPAC name: 5(hydroxymethyl)furan2carbaldehyde)
- Deoxyglucosone
- Diacetyl (PubChem CID: 650, IUPAC name: Butane2,3dione)
- Fructose (PubChem CID: 2723872)
- Furfual (PubChem CID: 7362, IUPAC name: furan2carbaldehyde)
- Furfural
- Glucose (PubChem CID: 107526)
- Glucosone (PubChem CID: 159630, IUPAC name: (4S,5R)4,5,6trihydroxy2oxohexanal)
- Glyoxal (PubChem CID: 7860, IUPAC name: oxaldehyde)
- Heat transfer
- Leucine (PubChem CID: 6106)
- Methylglyoxal (PubChem CID: 880, IUPAC name: 2oxopropanal)
- Reaction pathways
Collapse
Affiliation(s)
- J Lee
- Université Paris-Saclay, INRAE, AgroParisTech, UMR SayFood, 91300 Massy, France.
| | - S Roux
- Université Paris-Saclay, INRAE, AgroParisTech, UMR SayFood, 91300 Massy, France.
| | - E Le Roux
- Université Paris-Saclay, INRAE, AgroParisTech, UMR SayFood, 91300 Massy, France.
| | - S Keller
- Université Paris-Saclay, INRAE, AgroParisTech, UMR SayFood, 91300 Massy, France.
| | - B Rega
- Université Paris-Saclay, INRAE, AgroParisTech, UMR SayFood, 91300 Massy, France.
| | - C Bonazzi
- Université Paris-Saclay, INRAE, AgroParisTech, UMR SayFood, 91300 Massy, France.
| |
Collapse
|
20
|
Tomazic N, Overkamp KE, Wegner H, Gu B, Mahler F, Aras M, Keller S, Pierik AJ, Hofmann E, Frankenberg-Dinkel N. Exchange of a single amino acid residue in the cryptophyte phycobiliprotein lyase GtCPES expands its substrate specificity. Biochim Biophys Acta Bioenerg 2021; 1862:148493. [PMID: 34537203 DOI: 10.1016/j.bbabio.2021.148493] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/02/2021] [Revised: 08/26/2021] [Accepted: 09/07/2021] [Indexed: 06/13/2023]
Abstract
Cryptophytes are among the few eukaryotes employing phycobiliproteins (PBP) for light harvesting during oxygenic photosynthesis. In contrast to cyanobacterial PBP that are organized in membrane-associated phycobilisomes, those from cryptophytes are soluble within the chloroplast thylakoid lumen. Their light-harvesting capacity is due to covalent linkage of several open-chain tetrapyrrole chromophores (phycobilins). Guillardia theta utilizes the PBP phycoerythrin 545 with 15,16-dihydrobiliverdin (DHBV) in addition to phycoerythrobilin (PEB) as chromophores. The assembly of PBPs in cryptophytes involves the action of PBP-lyases as shown for cyanobacterial PBP. PBP-lyases facilitate the attachment of the chromophore in the right configuration and stereochemistry. Here we present the functional characterization of the eukaryotic S-type PBP lyase GtCPES. We show GtCPES-mediated transfer and covalent attachment of PEB to the conserved Cys82 of the acceptor PBP β-subunit (PmCpeB) of Prochlorococcus marinus MED4. On the basis of the previously solved crystal structure, the GtCPES binding pocket was investigated using site-directed mutagenesis. Thereby, amino acid residues involved in phycobilin binding and transfer were identified. Interestingly, exchange of a single amino acid residue Met67 to Ala extended the substrate specificity to phycocyanobilin (PCB), most likely by enlarging the substrate-binding pocket. Variant GtCPES_M67A binds both PEB and PCB forming a stable, colored complex in vitro and produced in Escherichia coli. GtCPES_M67A is able to mediate PCB transfer to Cys82 of PmCpeB. Based on these findings, we postulate that this single amino acid residue has a crucial role for bilin binding specificity of S-type phycoerythrin lyases but additional factors regulate handover to the target protein.
Collapse
Affiliation(s)
- Natascha Tomazic
- Microbiology, Faculty for Biology, Technische Universität Kaiserslautern (TUK), Germany
| | - Kristina E Overkamp
- Microbiology, Faculty for Biology, Technische Universität Kaiserslautern (TUK), Germany
| | - Helen Wegner
- Microbiology, Faculty for Biology, Technische Universität Kaiserslautern (TUK), Germany
| | - Bin Gu
- Microbiology, Faculty for Biology, Technische Universität Kaiserslautern (TUK), Germany
| | - Florian Mahler
- Molecular Biophysics, Technische Universität Kaiserslautern (TUK), Germany
| | - Marco Aras
- Microbiology, Faculty for Biology, Technische Universität Kaiserslautern (TUK), Germany
| | - Sandro Keller
- Molecular Biophysics, Technische Universität Kaiserslautern (TUK), Germany; Biophysics, Institute of Molecular Biosciences (IMB), NAWI Graz, University of Graz, Austria; Field of Excellence BioHealth, University of Graz, Graz, Austria; BioTechMed-Graz, Graz, Austria
| | - Antonio J Pierik
- Biochemistry, Faculty for Chemistry, Technische Universität Kaiserslautern (TUK), Germany
| | - Eckhard Hofmann
- Proteincrystallography, Faculty for Biology and Biotechnology, Ruhr-Universität Bochum, Germany
| | | |
Collapse
|
21
|
Mahler F, Meister A, Vargas C, Durand G, Keller S. Self-Assembly of Protein-Containing Lipid-Bilayer Nanodiscs from Small-Molecule Amphiphiles. Small 2021; 17:e2103603. [PMID: 34674382 DOI: 10.1002/smll.202103603] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/20/2021] [Revised: 08/24/2021] [Indexed: 06/13/2023]
Abstract
When membrane proteins are removed from their natural environment, the quality of the membrane-solubilizing agent used is critical for preserving their native structures and functions. Nanodiscs that retain a lipid-bilayer core around membrane proteins have attracted great attention because they offer a much more native-like environment than detergent micelles. Here, two small-molecule amphiphiles with diglucose headgroups and either a hydrocarbon or a fluorocarbon hydrophobic chain are shown to directly assemble lipids and membrane proteins to form native nanodiscs rather than mixed micelles. Self-assembly of nanodiscs of increasing complexity from both defined, artificial vesicles as well as complex, cellular membranes is demonstrated. A detailed investigation of bilayer integrity and membrane-protein activity in these nanodiscs reveals gentle effects on the encapsulated bilayer core. The fluorinated amphiphile appears particularly promising because its lipophobicity results in gentle, non-perturbing interactions with the nanoscale lipid bilayer. A sequential model of nanodisc self-assembly is proposed that proceeds through perforation of the original membrane followed by saturation and complete solubilization of the bilayer. On this basis, pseudophase diagrams are established for mixtures of lipids and nanodisc-forming diglucoside amphiphiles, and the latter are used for the extraction of a broad range of membrane proteins from cellular membranes.
Collapse
Affiliation(s)
- Florian Mahler
- Molecular Biophysics, Technische Universität Kaiserslautern (TUK), 67663, Kaiserslautern, Germany
| | - Annette Meister
- HALOmem and Institute of Biochemistry, Martin-Luther-Universität Halle-Wittenberg, 06108, Halle (Saale), Germany
| | - Carolyn Vargas
- Molecular Biophysics, Technische Universität Kaiserslautern (TUK), 67663, Kaiserslautern, Germany
- Biophysics, Institute of Molecular Biosciences (IMB), NAWI Graz, University of Graz, Graz, 8010, Austria
- Field of Excellence BioHealth, University of Graz, Graz, Austria
- BioTechMed-Graz, Graz, Austria
| | - Grégory Durand
- Equipe Chimie Bioorganique et Systèmes Amphiphiles, Institut des Biomolécules Max Mousseron, Avignon University, Avignon, 84916, France
- CHEM2STAB, Avignon, 84916, France
| | - Sandro Keller
- Molecular Biophysics, Technische Universität Kaiserslautern (TUK), 67663, Kaiserslautern, Germany
- Biophysics, Institute of Molecular Biosciences (IMB), NAWI Graz, University of Graz, Graz, 8010, Austria
- Field of Excellence BioHealth, University of Graz, Graz, Austria
- BioTechMed-Graz, Graz, Austria
| |
Collapse
|
22
|
Grousson E, Mahler F, Keller S, Contino-Pépin C, Durand G. Hybrid Fluorocarbon-Hydrocarbon Surfactants: Synthesis and Colloidal Characterization. J Org Chem 2021; 86:14672-14683. [PMID: 34609857 DOI: 10.1021/acs.joc.1c01493] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Four double-tailed hybrid fluorocarbon-hydrocarbon (F-H) surfactants with a poly(ethylene glycol) (PEG) polar headgroup were synthesized. The hydrophobic scaffold consists of an amino acid core, onto which were grafted both fluorocarbon and hydrocarbon chains of different lengths. The PEG polar head was connected to the hydrophobic scaffold through a copper(I)-mediated click reaction. The four derivatives exhibit aqueous solubility >100 g/L and self-assemble into micellar aggregates with micromolar critical micellar concentration (CMC) values, as demonstrated by isothermal titration calorimetry (ITC), surface tension (ST) measurements, and steady-state fluorescence spectroscopy. The CMC value decreased by a factor of ∼6 for each additional pair of CH2 groups, whereas a decrease by a factor of ∼2.5 was observed when the size of the PEG polar head was reduced from 2000 to 750 g/mol. Dynamic light scattering (DLS) showed unimodal micelle populations with hydrodynamic diameters of 10-15 nm, in agreement with results obtained from size-exclusion chromatography (SEC). The aggregation number increased with the hydrocarbon chain length but decreased with increasing PEG chain lengths. The combination in one molecular design of both low CMC and high water solubility makes these new surfactants promising systems for novel drug-delivery systems.
Collapse
Affiliation(s)
- Emilie Grousson
- Institut des Biomolécules Max Mousseron (IBMM)─UMR5247, 34093 Montpellier, France.,Equipe Chimie Bioorganique et Systèmes Amphiphiles (CBSA), Avignon Université, 84000 Avignon, France
| | - Florian Mahler
- Molecular Biophysics, Technische Universität Kaiserslautern, (TUK), Erwin-Schrödinger-Str. 13, 67663 Kaiserslautern, Germany
| | - Sandro Keller
- Molecular Biophysics, Technische Universität Kaiserslautern, (TUK), Erwin-Schrödinger-Str. 13, 67663 Kaiserslautern, Germany.,Biophysics, Institute of Molecular Biosciences (IMB), NAWI Graz, University of Graz, Humboldtstr. 50/III, 8010 Graz, Austria.,Field of Excellence BioHealth, University of Graz, 8010 Graz, Austria.,BioTechMed-Graz, 8010 Graz, Austria
| | - Christiane Contino-Pépin
- Institut des Biomolécules Max Mousseron (IBMM)─UMR5247, 34093 Montpellier, France.,Equipe Chimie Bioorganique et Systèmes Amphiphiles (CBSA), Avignon Université, 84000 Avignon, France
| | - Grégory Durand
- Institut des Biomolécules Max Mousseron (IBMM)─UMR5247, 34093 Montpellier, France.,Equipe Chimie Bioorganique et Systèmes Amphiphiles (CBSA), Avignon Université, 84000 Avignon, France
| |
Collapse
|
23
|
Krusche M, Schneider U, Geisler C, Keller S, Stenzel W, Ohrndorf S. [Myofasciitis under nivolumab treatment]. Z Rheumatol 2021; 80:884-888. [PMID: 33885949 PMCID: PMC8575749 DOI: 10.1007/s00393-021-01001-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/25/2021] [Indexed: 11/20/2022]
Abstract
We report the case of a 73-year-old female patient with malignant melanoma who developed rapidly progressive dermatosclerosis of the arms and legs as well as myalgia and flexion contractures during treatment with the immune checkpoint inhibitor nivolumab. The diagnosis of a myofasciitis was confirmed by imaging and biopsy. Following consultation with the treating dermato-oncologists nivolumab treatment was paused and treatment with methotrexate and prednisolone was initiated. Immune checkpoint inhibitors can induce a variety of immune-mediated side effects and can also imitate symptoms of rheumatological diseases. The occurrence of myofasciitis under immune checkpoint inhibition has been reported in the literature only in a few cases. Further oncological and rheumatological treatment management should be carried out in close interdisciplinary coordination.
Collapse
Affiliation(s)
- M Krusche
- Medizinische Klinik mit Schwerpunkt Rheumatologie und Klinische Immunologie, Charité - Universitätsmedizin, Charitéplatz 1, 10117, Berlin, Deutschland.
| | - U Schneider
- Medizinische Klinik mit Schwerpunkt Rheumatologie und Klinische Immunologie, Charité - Universitätsmedizin, Charitéplatz 1, 10117, Berlin, Deutschland
| | - C Geisler
- Klinik für Dermatologie, Venerologie und Allergologie, Charité - Universitätsmedizin, Charitéplatz 1, 10117, Berlin, Deutschland
| | - S Keller
- Klinik für Radiologie, Charité - Universitätsmedizin, Charitéplatz 1, 10117, Berlin, Deutschland
| | - W Stenzel
- Institut für Neuropathologie, Charité - Universitätsmedizin Berlin, Charitéplatz 1, 10117, Berlin, Deutschland
| | - S Ohrndorf
- Medizinische Klinik mit Schwerpunkt Rheumatologie und Klinische Immunologie, Charité - Universitätsmedizin, Charitéplatz 1, 10117, Berlin, Deutschland
| |
Collapse
|
24
|
Schumann R, Bischoff E, Klaus S, Möhring S, Flock J, Keller S, Remans K, Ganter M, Deponte M. Protein abundance and folding rather than the redox state of Kelch13 determine the artemisinin susceptibility of Plasmodium falciparum. Redox Biol 2021; 48:102177. [PMID: 34773836 PMCID: PMC8600086 DOI: 10.1016/j.redox.2021.102177] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2021] [Revised: 10/25/2021] [Accepted: 10/30/2021] [Indexed: 12/30/2022] Open
Abstract
Decreased susceptibilities of the human malaria parasite Plasmodium falciparum towards the endoperoxide antimalarial artemisinin are linked to mutations of residue C580 of PfKelch13, a homologue of the redox sensor Keap1 and other vertebrate BTB-Kelch proteins. Here, we addressed whether mutations alter the artemisinin susceptibility by modifying the redox properties of PfKelch13 or by compromising its native fold or abundance. Using selection-linked integration and the glmS ribozyme, efficient down-regulation of PfKelch13 resulted in ring-stage survival rates around 40%. While the loss of the thiol group of C469 or of the potential disulfide bond between residues C580 and C532 had no effect on the artemisinin susceptibility, the thiol group of C473 could not be replaced. Furthermore, we detected two different forms of PfKelch13 with distinct electrophoretic mobilities around 85 and 95 kDa, suggesting an unidentified post-translational modification. We also established a protocol for the production of recombinant PfKelch13 and produced an antibody against the protein. Recombinant PfKelch13 adopted alternative oligomeric states and only two of its seven cysteine residues, C469 and C473, reacted with Ellman's reagent. While common field mutations resulted in misfolded and completely insoluble recombinant PfKelch13, cysteine-to-serine replacements had no effect on the solubility except for residue C473. In summary, in contrast to residues C469, C532, and C580, the surface-exposed thiol group of residue C473 appears to be essential. However, not the redox properties but impaired folding of PfKelch13, resulting in a decreased PfKelch13 abundance, alters the artemisinin susceptibility and is the central parameter for mutant selection.
Collapse
Affiliation(s)
- Robin Schumann
- Faculty of Chemistry, Comparative Biochemistry, Technische Universität Kaiserslautern, D-67663 Kaiserslautern, Germany
| | - Eileen Bischoff
- Faculty of Chemistry, Comparative Biochemistry, Technische Universität Kaiserslautern, D-67663 Kaiserslautern, Germany
| | - Severina Klaus
- Centre for Infectious Diseases, Parasitology, Heidelberg University Hospital, D-69120, Heidelberg, Germany
| | - Sophie Möhring
- Faculty of Chemistry, Comparative Biochemistry, Technische Universität Kaiserslautern, D-67663 Kaiserslautern, Germany
| | - Julia Flock
- Protein Expression and Purification Core Facility, European Molecular Biology Laboratory (EMBL), D-69117, Heidelberg, Germany
| | - Sandro Keller
- Molecular Biophysics, Technische Universität Kaiserslautern, D-67663, Kaiserslautern, Germany; Biophysics, Institute of Molecular Biosciences (IMB), NAWI Graz, University of Graz, Humboldtstr. 50/III, 8010, Graz, Austria; Field of Excellence BioHealth, University of Graz, Graz, Austria; BioTechMed-Graz, Graz, Austria
| | - Kim Remans
- Protein Expression and Purification Core Facility, European Molecular Biology Laboratory (EMBL), D-69117, Heidelberg, Germany
| | - Markus Ganter
- Centre for Infectious Diseases, Parasitology, Heidelberg University Hospital, D-69120, Heidelberg, Germany
| | - Marcel Deponte
- Faculty of Chemistry, Comparative Biochemistry, Technische Universität Kaiserslautern, D-67663 Kaiserslautern, Germany.
| |
Collapse
|
25
|
Janson K, Zierath J, Kyrilis FL, Semchonok DA, Hamdi F, Skalidis I, Kopf AH, Das M, Kolar C, Rasche M, Vargas C, Keller S, Kastritis PL, Meister A. Solubilization of artificial mitochondrial membranes by amphiphilic copolymers of different charge. Biochim Biophys Acta Biomembr 2021; 1863:183725. [PMID: 34384757 DOI: 10.1016/j.bbamem.2021.183725] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 05/01/2021] [Revised: 07/21/2021] [Accepted: 08/02/2021] [Indexed: 01/19/2023]
Abstract
Certain amphiphilic copolymers form lipid-bilayer nanodiscs from artificial and natural membranes, thereby rendering incorporated membrane proteins optimal for structural analysis. Recent studies have shown that the amphiphilicity of a copolymer strongly determines its solubilization efficiency. This is especially true for highly negatively charged membranes, which experience pronounced Coulombic repulsion with polyanionic polymers. Here, we present a systematic study on the solubilization of artificial multicomponent lipid vesicles that mimic inner mitochondrial membranes, which harbor essential membrane-protein complexes. In particular, we compared the lipid-solubilization efficiencies of established anionic with less densely charged or zwitterionic and even cationic copolymers in low- and high-salt concentrations. The nanodiscs formed under these conditions were characterized by dynamic light scattering and negative-stain electron microscopy, pointing to a bimodal distribution of nanodisc diameters with a considerable fraction of nanodiscs engaging in side-by-side interactions through their polymer rims. Overall, our results show that some recent, zwitterionic copolymers are best suited to solubilize negatively charged membranes at high ionic strengths even at low polymer/lipid ratios.
Collapse
Affiliation(s)
- Kevin Janson
- Interdisciplinary Research Center HALOmem, Charles Tanford Protein Center, Martin Luther University Halle-Wittenberg, Kurt-Mothes-Straße 3a, 06120 Halle/Saale, Germany; Institute of Biochemistry and Biotechnology, Martin Luther University Halle-Wittenberg, Kurt-Mothes-Straße 3a, 06120 Halle/Saale, Germany
| | - Jennifer Zierath
- Institute of Biochemistry and Biotechnology, Martin Luther University Halle-Wittenberg, Kurt-Mothes-Straße 3a, 06120 Halle/Saale, Germany
| | - Fotis L Kyrilis
- Interdisciplinary Research Center HALOmem, Charles Tanford Protein Center, Martin Luther University Halle-Wittenberg, Kurt-Mothes-Straße 3a, 06120 Halle/Saale, Germany; Institute of Biochemistry and Biotechnology, Martin Luther University Halle-Wittenberg, Kurt-Mothes-Straße 3a, 06120 Halle/Saale, Germany
| | - Dmitry A Semchonok
- Interdisciplinary Research Center HALOmem, Charles Tanford Protein Center, Martin Luther University Halle-Wittenberg, Kurt-Mothes-Straße 3a, 06120 Halle/Saale, Germany
| | - Farzad Hamdi
- Interdisciplinary Research Center HALOmem, Charles Tanford Protein Center, Martin Luther University Halle-Wittenberg, Kurt-Mothes-Straße 3a, 06120 Halle/Saale, Germany
| | - Ioannis Skalidis
- Interdisciplinary Research Center HALOmem, Charles Tanford Protein Center, Martin Luther University Halle-Wittenberg, Kurt-Mothes-Straße 3a, 06120 Halle/Saale, Germany; Institute of Biochemistry and Biotechnology, Martin Luther University Halle-Wittenberg, Kurt-Mothes-Straße 3a, 06120 Halle/Saale, Germany
| | - Adrian H Kopf
- Membrane Biochemistry and Biophysics, Bijvoet Center for Biomolecular Research, Institute of Biomembranes, Utrecht University, Padualaan 8, 3584 CH Utrecht, the Netherlands
| | - Manabendra Das
- Molecular Biophysics, Technische Universität Kaiserslautern (TUK), Erwin-Schrödinger-Straße 13, 67663 Kaiserslautern, Germany
| | - Cenek Kolar
- GLYCON Biochemicals GmbH, Im Biotechnologie Park TGZ 1, 14943 Luckenwalde, Germany
| | - Marie Rasche
- GLYCON Biochemicals GmbH, Im Biotechnologie Park TGZ 1, 14943 Luckenwalde, Germany
| | - Carolyn Vargas
- Molecular Biophysics, Technische Universität Kaiserslautern (TUK), Erwin-Schrödinger-Straße 13, 67663 Kaiserslautern, Germany; Biophysics, Institute of Molecular Biosciences (IMB), NAWI Graz, University of Graz, Humboldtstr. 50/III, 8010 Graz, Austria; Field of Excellence BioHealth, University of Graz, Graz, Austria; BioTechMed-Graz, Graz, Austria
| | - Sandro Keller
- Molecular Biophysics, Technische Universität Kaiserslautern (TUK), Erwin-Schrödinger-Straße 13, 67663 Kaiserslautern, Germany; Biophysics, Institute of Molecular Biosciences (IMB), NAWI Graz, University of Graz, Humboldtstr. 50/III, 8010 Graz, Austria; Field of Excellence BioHealth, University of Graz, Graz, Austria; BioTechMed-Graz, Graz, Austria
| | - Panagiotis L Kastritis
- Interdisciplinary Research Center HALOmem, Charles Tanford Protein Center, Martin Luther University Halle-Wittenberg, Kurt-Mothes-Straße 3a, 06120 Halle/Saale, Germany; Institute of Biochemistry and Biotechnology, Martin Luther University Halle-Wittenberg, Kurt-Mothes-Straße 3a, 06120 Halle/Saale, Germany; Biozentrum, Martin Luther University Halle-Wittenberg, Weinbergweg 22, 06120 Halle/Saale, Germany.
| | - Annette Meister
- Interdisciplinary Research Center HALOmem, Charles Tanford Protein Center, Martin Luther University Halle-Wittenberg, Kurt-Mothes-Straße 3a, 06120 Halle/Saale, Germany; Institute of Biochemistry and Biotechnology, Martin Luther University Halle-Wittenberg, Kurt-Mothes-Straße 3a, 06120 Halle/Saale, Germany.
| |
Collapse
|
26
|
Hoffmann M, Haselberger D, Hofmann T, Müller L, Janson K, Meister A, Das M, Vargas C, Keller S, Kastritis PL, Schmidt C, Hinderberger D. Nanoscale Model System for the Human Myelin Sheath. Biomacromolecules 2021; 22:3901-3912. [PMID: 34324309 DOI: 10.1021/acs.biomac.1c00714] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Neurodegenerative disorders are among the most common diseases in modern society. However, the molecular bases of diseases such as multiple sclerosis or Charcot-Marie-Tooth disease remain far from being fully understood. Research in this field is limited by the complex nature of native myelin and by difficulties in obtaining good in vitro model systems of myelin. Here, we introduce an easy-to-use model system of the myelin sheath that can be used to study myelin proteins in a native-like yet well-controlled environment. To this end, we present myelin-mimicking nanodiscs prepared through one of the amphiphilic copolymers styrene/maleic acid (SMA), diisobutylene/maleic acid (DIBMA), and styrene/maleimide sulfobetaine (SMA-SB). These nanodiscs were tested for their lipid composition using chromatographic (HPLC) and mass spectrometric (MS) methods and, utilizing spin probes within the nanodisc, their comparability with liposomes was studied. In addition, their binding behavior with bovine myelin basic protein (MBP) was scrutinized to ensure that the nanodiscs represent a suitable model system of myelin. Our results suggest that both SMA and SMA-SB are able to solubilize the myelin-like (cytoplasmic) liposomes without preferences for specific lipid headgroups or fatty acyl chains. In nanodiscs of both SMA and SMA-SB (called SMA(-SB)-lipid particles, short SMALPs or SMA-SBLPs, respectively), the polymers restrict the lipids' motion in the hydrophobic center of the bilayer. The headgroups of the lipids, however, are sterically less hindered in nanodiscs when compared with liposomes. Myelin-like SMALPs are able to bind bovine MBP, which can stack the lipid bilayers like in native myelin, showing the usability of these simple, well-controlled systems in further studies of protein-lipid interactions of native myelin.
Collapse
Affiliation(s)
- Matthias Hoffmann
- Interdisciplinary Research Center HALOmem, Martin Luther University (MLU) Halle-Wittenberg, Charles Tanford Protein Center, Kurt-Mothes-Straße 3a, 06120 Halle (Saale), Germany.,Institute of Chemistry, Martin Luther University (MLU) Halle-Wittenberg, Von-Danckelmann-Platz 4, 06120 Halle (Saale), Germany
| | - David Haselberger
- Interdisciplinary Research Center HALOmem, Martin Luther University (MLU) Halle-Wittenberg, Charles Tanford Protein Center, Kurt-Mothes-Straße 3a, 06120 Halle (Saale), Germany.,Institute of Chemistry, Martin Luther University (MLU) Halle-Wittenberg, Von-Danckelmann-Platz 4, 06120 Halle (Saale), Germany
| | - Tommy Hofmann
- Interdisciplinary Research Center HALOmem, Martin Luther University (MLU) Halle-Wittenberg, Charles Tanford Protein Center, Kurt-Mothes-Straße 3a, 06120 Halle (Saale), Germany.,Institute of Biochemistry and Biotechnology, Martin Luther University (MLU) Halle-Wittenberg, Charles Tanford Protein Center, Kurt-Mothes-Straße 3a, 06120 Halle (Saale), Germany
| | - Lisa Müller
- Institute of Pharmacy, Martin Luther University (MLU) Halle-Wittenberg, Wolfgang-Langenbeck-Straße 4, 06120 Halle (Saale), Germany
| | - Kevin Janson
- Interdisciplinary Research Center HALOmem, Martin Luther University (MLU) Halle-Wittenberg, Charles Tanford Protein Center, Kurt-Mothes-Straße 3a, 06120 Halle (Saale), Germany.,Institute of Biochemistry and Biotechnology, Martin Luther University (MLU) Halle-Wittenberg, Charles Tanford Protein Center, Kurt-Mothes-Straße 3a, 06120 Halle (Saale), Germany
| | - Annette Meister
- Interdisciplinary Research Center HALOmem, Martin Luther University (MLU) Halle-Wittenberg, Charles Tanford Protein Center, Kurt-Mothes-Straße 3a, 06120 Halle (Saale), Germany.,Institute of Biochemistry and Biotechnology, Martin Luther University (MLU) Halle-Wittenberg, Charles Tanford Protein Center, Kurt-Mothes-Straße 3a, 06120 Halle (Saale), Germany
| | - Manabendra Das
- Molecular Biophysics, Technische Universität Kaiserslautern (TUK), Erwin-Schrödinger-Straße 13, 67663 Kaiserslautern, Germany
| | - Carolyn Vargas
- Molecular Biophysics, Technische Universität Kaiserslautern (TUK), Erwin-Schrödinger-Straße 13, 67663 Kaiserslautern, Germany.,Biophysics, Institute of Molecular Biosciences (IMB), NAWI Graz, University of Graz, Humboldtstraße 50/III, 8010 Graz, Austria.,Field of Excellence BioHealth, University of Graz, 8010 Graz, Austria.,BioTechMed-Graz, 8010 Graz, Austria
| | - Sandro Keller
- Molecular Biophysics, Technische Universität Kaiserslautern (TUK), Erwin-Schrödinger-Straße 13, 67663 Kaiserslautern, Germany.,Biophysics, Institute of Molecular Biosciences (IMB), NAWI Graz, University of Graz, Humboldtstraße 50/III, 8010 Graz, Austria.,Field of Excellence BioHealth, University of Graz, 8010 Graz, Austria.,BioTechMed-Graz, 8010 Graz, Austria
| | - Panagiotis L Kastritis
- Interdisciplinary Research Center HALOmem, Martin Luther University (MLU) Halle-Wittenberg, Charles Tanford Protein Center, Kurt-Mothes-Straße 3a, 06120 Halle (Saale), Germany.,Institute of Biochemistry and Biotechnology, Martin Luther University (MLU) Halle-Wittenberg, Charles Tanford Protein Center, Kurt-Mothes-Straße 3a, 06120 Halle (Saale), Germany
| | - Carla Schmidt
- Interdisciplinary Research Center HALOmem, Martin Luther University (MLU) Halle-Wittenberg, Charles Tanford Protein Center, Kurt-Mothes-Straße 3a, 06120 Halle (Saale), Germany.,Institute of Biochemistry and Biotechnology, Martin Luther University (MLU) Halle-Wittenberg, Charles Tanford Protein Center, Kurt-Mothes-Straße 3a, 06120 Halle (Saale), Germany
| | - Dariush Hinderberger
- Interdisciplinary Research Center HALOmem, Martin Luther University (MLU) Halle-Wittenberg, Charles Tanford Protein Center, Kurt-Mothes-Straße 3a, 06120 Halle (Saale), Germany.,Institute of Chemistry, Martin Luther University (MLU) Halle-Wittenberg, Von-Danckelmann-Platz 4, 06120 Halle (Saale), Germany
| |
Collapse
|
27
|
Hoffmann M, Eisermann J, Schöffmann FA, Das M, Vargas C, Keller S, Hinderberger D. Influence of different polymer belts on lipid properties in nanodiscs characterized by CW EPR spectroscopy. Biochim Biophys Acta Biomembr 2021; 1863:183681. [PMID: 34186033 DOI: 10.1016/j.bbamem.2021.183681] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 04/13/2021] [Revised: 05/31/2021] [Accepted: 06/14/2021] [Indexed: 12/21/2022]
Abstract
With this study we aim at comparing the well-known lipid membrane model system of liposomes and polymer-encapsulated nanodiscs regarding their lipid properties. Using differential scanning calorimetry (DSC) and continuous-wave electron paramagnetic resonance (CW EPR) spectroscopy, we characterize the temperature-dependent lipid behavior within 1,2-dimyristoyl-sn-glycero-3-phosphocholine (DMPC) liposomes and nanodiscs made from such liposomes by application of various polymers based on styrene-co-maleic acid (SMA), diisobutylene-alt-maleic acid (DIBMA), and styrene-co-maleic amide sulfobetaine (SMA-SB), a new SMA-derived copolymer containing sulfobetaine side chains. By incorporating a spin label doxyl moiety into the lipid bilayer in position 16 or 5 we were able to study the micropolarity as well as rotational restrictions onto the lipids in the apolar bilayer center and the chain region adjacent to the carbonyl groups, respectively. Our results suggest that all polymers broaden the main melting transition of DMPC, change the water accessibility within the lipid bilayer, and exhibit additional constraints onto the lipids. Independent of the used polymer, the rotational mobility of both spin-labeled lipids decreased with DIBMA exerting less restraints probably due to its aliphatic side chains. Our findings imply that the choice of the solubilizing polymer has to be considered an important step to form lipid nanodiscs which should be included into research of lipid membranes and membrane proteins in the future.
Collapse
Affiliation(s)
- Matthias Hoffmann
- Institute of Chemistry, Physical Chemistry - Complex Self-Organizing Systems, Martin Luther University (MLU) Halle-Wittenberg, Von-Danckelmann-Platz 4, 06120 Halle (Saale), Germany; Interdisciplinary Research Center HALOmem, Charles Tanford Protein Center, MLU Halle-Wittenberg, Kurt-Mothes-Str. 3a, 06120 Halle (Saale), Germany
| | - Jana Eisermann
- Institute of Chemistry, Physical Chemistry - Complex Self-Organizing Systems, Martin Luther University (MLU) Halle-Wittenberg, Von-Danckelmann-Platz 4, 06120 Halle (Saale), Germany; Department of Chemistry - Molecular Sciences Research Hub, Imperial College London, 82 Wood Ln, W12 0BZ London, United Kingdom
| | - Florian Arndt Schöffmann
- Institute of Chemistry, Physical Chemistry - Complex Self-Organizing Systems, Martin Luther University (MLU) Halle-Wittenberg, Von-Danckelmann-Platz 4, 06120 Halle (Saale), Germany; Interdisciplinary Research Center HALOmem, Charles Tanford Protein Center, MLU Halle-Wittenberg, Kurt-Mothes-Str. 3a, 06120 Halle (Saale), Germany
| | - Manabendra Das
- Molecular Biophysics, Technische Universität Kaiserslautern (TUK), Erwin-Schrödinger-Str. 13, 67663 Kaiserslautern, Germany
| | - Carolyn Vargas
- Molecular Biophysics, Technische Universität Kaiserslautern (TUK), Erwin-Schrödinger-Str. 13, 67663 Kaiserslautern, Germany; Biophysics, Institute of Molecular Biosciences (IMB), NAWI Graz, University of Graz, Humboldtstr. 50/III, 8010 Graz, Austria; Field of Excellence BioHealth, University of Graz, Graz, Austria; BioTechMed-Graz, Graz, Austria
| | - Sandro Keller
- Molecular Biophysics, Technische Universität Kaiserslautern (TUK), Erwin-Schrödinger-Str. 13, 67663 Kaiserslautern, Germany; Biophysics, Institute of Molecular Biosciences (IMB), NAWI Graz, University of Graz, Humboldtstr. 50/III, 8010 Graz, Austria; Field of Excellence BioHealth, University of Graz, Graz, Austria; BioTechMed-Graz, Graz, Austria
| | - Dariush Hinderberger
- Institute of Chemistry, Physical Chemistry - Complex Self-Organizing Systems, Martin Luther University (MLU) Halle-Wittenberg, Von-Danckelmann-Platz 4, 06120 Halle (Saale), Germany; Interdisciplinary Research Center HALOmem, Charles Tanford Protein Center, MLU Halle-Wittenberg, Kurt-Mothes-Str. 3a, 06120 Halle (Saale), Germany.
| |
Collapse
|
28
|
Eisermann J, Hoffmann M, Schöffmann FA, Das M, Vargas C, Keller S, Hinderberger D. Molecular‐Level Interactions of Nanodisc‐Forming Copolymers Dissected by EPR Spectroscopy. MACROMOL CHEM PHYS 2021. [DOI: 10.1002/macp.202100051] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Affiliation(s)
- Jana Eisermann
- Institute of Chemistry–Physical Chemistry–Complex Self‐Organizing Systems Martin Luther University (MLU) Halle‐Wittenberg Von‐Danckelmann‐Platz 4 06120 Halle (Saale) Germany
- Department of Chemistry – Molecular Sciences Research Hub Imperial College London 82 Wood Ln London W12 0BZ UK
| | - Matthias Hoffmann
- Institute of Chemistry–Physical Chemistry–Complex Self‐Organizing Systems Martin Luther University (MLU) Halle‐Wittenberg Von‐Danckelmann‐Platz 4 06120 Halle (Saale) Germany
- Interdisciplinary Research Center HALOmem MLU Halle‐Wittenberg Charles Tanford Protein Center Kurt‐Mothes‐Str. 3a 06120 Halle (Saale) Germany
| | - Florian A. Schöffmann
- Institute of Chemistry–Physical Chemistry–Complex Self‐Organizing Systems Martin Luther University (MLU) Halle‐Wittenberg Von‐Danckelmann‐Platz 4 06120 Halle (Saale) Germany
- Interdisciplinary Research Center HALOmem MLU Halle‐Wittenberg Charles Tanford Protein Center Kurt‐Mothes‐Str. 3a 06120 Halle (Saale) Germany
| | - Manabendra Das
- Molecular Biophysics Technische Universität Kaiserslautern (TUK) Erwin‐Schrödinger‐Str. 13 67663 Kaiserslautern Germany
| | - Carolyn Vargas
- Molecular Biophysics Technische Universität Kaiserslautern (TUK) Erwin‐Schrödinger‐Str. 13 67663 Kaiserslautern Germany
- Department of Biophysics Institute of Molecular Biosciences (IMB) NAWI Graz University of Graz Humboldtstr Graz 8010 Austria
- Field of Excellence BioHealth University of Graz Humboldtstr, 50/I Graz 8010 Austria
- BioTechMed‐Graz Mozartstr, 12/II Graz 8010 Austria
| | - Sandro Keller
- Molecular Biophysics Technische Universität Kaiserslautern (TUK) Erwin‐Schrödinger‐Str. 13 67663 Kaiserslautern Germany
- Department of Biophysics Institute of Molecular Biosciences (IMB) NAWI Graz University of Graz Humboldtstr Graz 8010 Austria
- Field of Excellence BioHealth University of Graz Humboldtstr, 50/I Graz 8010 Austria
- BioTechMed‐Graz Mozartstr, 12/II Graz 8010 Austria
| | - Dariush Hinderberger
- Institute of Chemistry–Physical Chemistry–Complex Self‐Organizing Systems Martin Luther University (MLU) Halle‐Wittenberg Von‐Danckelmann‐Platz 4 06120 Halle (Saale) Germany
- Interdisciplinary Research Center HALOmem MLU Halle‐Wittenberg Charles Tanford Protein Center Kurt‐Mothes‐Str. 3a 06120 Halle (Saale) Germany
| |
Collapse
|
29
|
Hetzel U, Korzyukov Y, Keller S, Szirovicza L, Pesch T, Vapalahti O, Kipar A, Hepojoki J. Experimental Reptarenavirus Infection of Boa constrictor and Python regius. J Virol 2021; 95:JVI.01968-20. [PMID: 33441344 PMCID: PMC8092697 DOI: 10.1128/jvi.01968-20] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2020] [Accepted: 12/22/2020] [Indexed: 11/20/2022] Open
Abstract
Boid inclusion body disease (BIBD) causes losses in captive snake populations globally. BIBD is associated with the formation of cytoplasmic inclusion bodies (IBs), which mainly comprise reptarenavirus nucleoprotein (NP). In 2017, BIBD was reproduced by cardiac injection of boas and pythons with reptarenaviruses, thus demonstrating a causative link between reptarenavirus infection and the disease. Here, we report experimental infections of Python regius (n = 16) and Boa constrictor (n = 16) with three reptarenavirus isolates. First, we used pythons (n = 8) to test two virus delivery routes: intraperitoneal injection and tracheal instillation. Viral RNAs but no IBs were detected in brains and lungs at 2 weeks postinoculation. Next, we inoculated pythons (n = 8) via the trachea. During the 4 months following infection, snakes showed transient central nervous system (CNS) signs but lacked detectable IBs at the time of euthanasia. One of the snakes developed severe CNS signs; we succeeded in reisolating the virus from the brain of this individual and could demonstrate viral antigen in neurons. In a third attempt, we tested cohousing, vaccination, and sequential infection with multiple reptarenavirus isolates on boas (n = 16). At 10 months postinoculation, all but one snake tested positive for viral RNA in lung, brain, and/or blood, but none exhibited the characteristic IBs. Three of the four vaccinated snakes seemed to sustain challenge with the same reptarenavirus; however, neither of the two snakes rechallenged with different reptarenaviruses remained uninfected. Comparison of the antibody responses in experimentally versus naturally reptarenavirus-infected animals indicated differences in the responses.IMPORTANCE In the present study, we experimentally infected pythons and boas with reptarenavirus via either intraperitoneal injection or tracheal instillation. The aims were to experimentally induce boid inclusion body disease (BIBD) and to develop an animal model for studying disease transmission and pathogenesis. Both virus delivery routes resulted in infection, and infection via the trachea could reflect the natural route of infection. In the experimentally infected snakes, we did not find evidence of inclusion body (IB) formation, characteristic of BIBD, in pythons or boas. Most of the boas (11/12) remained reptarenavirus infected after 10 months, which suggests that they developed a persistent infection that could eventually have led to BIBD. We demonstrated that vaccination using recombinant protein or an inactivated virus preparation prevented infection by a homologous virus in three of four snakes. Comparison of the antibody responses of experimentally and naturally reptarenavirus-infected snakes revealed differences that merit further studies.
Collapse
Affiliation(s)
- U Hetzel
- Institute of Veterinary Pathology, Vetsuisse Faculty, University of Zürich, Zürich, Switzerland
- University of Helsinki, Department of Veterinary Biosciences, Faculty of Veterinary Medicine, Helsinki, Finland
| | - Y Korzyukov
- University of Helsinki, Medicum, Department of Virology, Helsinki, Finland
| | - S Keller
- Institute of Veterinary Pathology, Vetsuisse Faculty, University of Zürich, Zürich, Switzerland
| | - L Szirovicza
- University of Helsinki, Medicum, Department of Virology, Helsinki, Finland
| | - T Pesch
- Institute of Veterinary Pathology, Vetsuisse Faculty, University of Zürich, Zürich, Switzerland
| | - O Vapalahti
- University of Helsinki, Medicum, Department of Virology, Helsinki, Finland
- University of Helsinki, Department of Veterinary Biosciences, Faculty of Veterinary Medicine, Helsinki, Finland
- University of Helsinki and Helsinki University Hospital, Department of Virology, Helsinki, Finland
| | - A Kipar
- Institute of Veterinary Pathology, Vetsuisse Faculty, University of Zürich, Zürich, Switzerland
- University of Helsinki, Department of Veterinary Biosciences, Faculty of Veterinary Medicine, Helsinki, Finland
| | - J Hepojoki
- Institute of Veterinary Pathology, Vetsuisse Faculty, University of Zürich, Zürich, Switzerland
- University of Helsinki, Medicum, Department of Virology, Helsinki, Finland
| |
Collapse
|
30
|
Wehbie M, Onyia KK, Mahler F, Le Roy A, Deletraz A, Bouchemal I, Vargas C, Babalola JO, Breyton C, Ebel C, Keller S, Durand G. Maltose-Based Fluorinated Surfactants for Membrane-Protein Extraction and Stabilization. Langmuir 2021; 37:2111-2122. [PMID: 33539092 DOI: 10.1021/acs.langmuir.0c03214] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Two new surfactants, F5OM and F5DM, were designed as partially fluorinated analogues of n-dodecyl-β-D-maltoside (DDM). The micellization properties and the morphologies of the aggregates formed by the two surfactants in water and phosphate buffer were evaluated by NMR spectroscopy, surface tension measurement, isothermal titration calorimetry, dynamic light scattering, small-angle X-ray scattering, and analytical ultracentrifugation. As expected, the critical micellar concentration (cmc) was found to decrease with chain length of the fluorinated tail from 2.1-2.5 mM for F5OM to 0.3-0.5 mM for F5DM, and micellization was mainly entropy-driven at 25 °C. Close to their respective cmc, the micelle sizes were similar for both surfactants, that is, 7 and 13 nm for F5OM and F5DM, respectively, and both increased with concentration forming 4 nm diameter rods with maximum dimensions of 50 and 70 nm, respectively, at a surfactant concentration of ∼30 mM. The surfactants were found to readily solubilize lipid vesicles and extract membrane proteins directly from Escherichia coli membranes. They were found more efficient than the commercial fluorinated detergent F6H2OM over a broad range of concentrations (1-10 mM) and even better than DDM at low concentrations (1-5 mM). When transferred into the two new surfactants, the thermal stability of the proteins bacteriorhodopsin (bR) and FhuA was higher than in the presence of their solubilization detergents and similar to that in DDM; furthermore, bR was stable over several months. The membrane enzymes SpNOX and BmrA were not as active as in DDM micelles but similarly active as in F6OM. Together, these findings indicate both extracting and stabilizing properties of the new maltose-based fluorinated surfactants, making them promising tools in MP applications.
Collapse
Affiliation(s)
- Moheddine Wehbie
- Institut des Biomolécules Max Mousseron (UMR 5247 UM-CNRS-ENSCM) & Avignon University, Equipe Chimie Bioorganique et Systèmes amphiphiles, 301 rue Baruch de Spinoza, 84916 cedex 9 Avignon, France
| | - Kenechi Kanayo Onyia
- Molecular Biophysics, Technische Universität Kaiserslautern (TUK), Erwin-Schrödinger-Str. 13, 67663 Kaiserslautern, Germany
- Department of Chemistry, University of Ibadan, 200284 Ibadan, Nigeria
| | - Florian Mahler
- Molecular Biophysics, Technische Universität Kaiserslautern (TUK), Erwin-Schrödinger-Str. 13, 67663 Kaiserslautern, Germany
| | - Aline Le Roy
- Université Grenoble Alpes, CNRS, CEA, CNRS, IBS, F-38000 Grenoble, France
| | - Anais Deletraz
- Institut des Biomolécules Max Mousseron (UMR 5247 UM-CNRS-ENSCM) & Avignon University, Equipe Chimie Bioorganique et Systèmes amphiphiles, 301 rue Baruch de Spinoza, 84916 cedex 9 Avignon, France
| | - Ilham Bouchemal
- Université Grenoble Alpes, CNRS, CEA, CNRS, IBS, F-38000 Grenoble, France
| | - Carolyn Vargas
- Molecular Biophysics, Technische Universität Kaiserslautern (TUK), Erwin-Schrödinger-Str. 13, 67663 Kaiserslautern, Germany
- Biophysics, Institute of Molecular Biosciences (IMB), NAWI Graz, University of Graz, Humboldtstr. 50/III 8010 Graz, Austria
- Field of Excellence BioHealth, University of Graz, 8010 Graz, Austria
- BioTechMed-Graz, 8010 Graz, Austria
| | | | - Cécile Breyton
- Université Grenoble Alpes, CNRS, CEA, CNRS, IBS, F-38000 Grenoble, France
| | - Christine Ebel
- Université Grenoble Alpes, CNRS, CEA, CNRS, IBS, F-38000 Grenoble, France
| | - Sandro Keller
- Molecular Biophysics, Technische Universität Kaiserslautern (TUK), Erwin-Schrödinger-Str. 13, 67663 Kaiserslautern, Germany
- Biophysics, Institute of Molecular Biosciences (IMB), NAWI Graz, University of Graz, Humboldtstr. 50/III 8010 Graz, Austria
- Field of Excellence BioHealth, University of Graz, 8010 Graz, Austria
- BioTechMed-Graz, 8010 Graz, Austria
| | - Grégory Durand
- Institut des Biomolécules Max Mousseron (UMR 5247 UM-CNRS-ENSCM) & Avignon University, Equipe Chimie Bioorganique et Systèmes amphiphiles, 301 rue Baruch de Spinoza, 84916 cedex 9 Avignon, France
| |
Collapse
|
31
|
Das M, Mahler F, Hariharan P, Wang H, Du Y, Mortensen JS, Patallo EP, Ghani L, Glück D, Lee HJ, Byrne B, Loland CJ, Guan L, Kobilka BK, Keller S, Chae PS. Diastereomeric Cyclopentane-Based Maltosides (CPMs) as Tools for Membrane Protein Study. J Am Chem Soc 2020; 142:21382-21392. [PMID: 33315387 DOI: 10.1021/jacs.0c09629] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Amphiphilic agents, called detergents, are invaluable tools for studying membrane proteins. However, membrane proteins encapsulated by conventional head-to-tail detergents tend to denature or aggregate, necessitating the development of structurally distinct molecules with improved efficacy. Here, a novel class of diastereomeric detergents with a cyclopentane core unit, designated cyclopentane-based maltosides (CPMs), were prepared and evaluated for their ability to solubilize and stabilize several model membrane proteins. A couple of CPMs displayed enhanced behavior compared with the benchmark conventional detergent, n-dodecyl-β-d-maltoside (DDM), for all the tested membrane proteins including two G-protein-coupled receptors (GPCRs). Furthermore, CPM-C12 was notable for its ability to confer enhanced membrane protein stability compared with the previously developed conformationally rigid NBMs [J. Am. Chem. Soc. 2017, 139, 3072] and LMNG. The effect of the individual CPMs on protein stability varied depending on both the detergent configuration (cis/trans) and alkyl chain length, allowing us draw conclusions on the detergent structure-property-efficacy relationship. Thus, this study not only provides novel detergent tools useful for membrane protein research but also reports on structural features of the detergents critical for detergent efficacy in stabilizing membrane proteins.
Collapse
Affiliation(s)
- Manabendra Das
- Department of Bionanotechnology, Center for Bionano Intelligence Education and Research, Hanyang University, Ansan 155-88, Korea.,Technische Universität Kaiserslautern (TUK), Erwin-Schrödinger-Str. 13, 67663 Kaiserslautern, Germany
| | - Florian Mahler
- Technische Universität Kaiserslautern (TUK), Erwin-Schrödinger-Str. 13, 67663 Kaiserslautern, Germany
| | - Parameswaran Hariharan
- Department of Cell Physiology and Molecular Biophysics, Center for Membrane Protein Research, School of Medicine, Texas Tech University Health Sciences Center, Lubbock, Texas 79430, United States
| | - Haoqing Wang
- Department of Molecular and Cellular Physiology, Stanford University, Stanford, California 94305, United States
| | - Yang Du
- Department of Molecular and Cellular Physiology, Stanford University, Stanford, California 94305, United States
| | - Jonas S Mortensen
- Department of Neuroscience, University of Copenhagen, Copenhagen DK-2200, Denmark
| | - Eugenio Pérez Patallo
- Technische Universität Kaiserslautern (TUK), Erwin-Schrödinger-Str. 13, 67663 Kaiserslautern, Germany
| | - Lubna Ghani
- Department of Bionanotechnology, Center for Bionano Intelligence Education and Research, Hanyang University, Ansan 155-88, Korea
| | - David Glück
- Technische Universität Kaiserslautern (TUK), Erwin-Schrödinger-Str. 13, 67663 Kaiserslautern, Germany
| | - Ho Jin Lee
- Department of Bionanotechnology, Center for Bionano Intelligence Education and Research, Hanyang University, Ansan 155-88, Korea
| | - Bernadette Byrne
- Department of Life Sciences, Imperial College London, London SW7 2AZ, United Kingdom
| | - Claus J Loland
- Department of Neuroscience, University of Copenhagen, Copenhagen DK-2200, Denmark
| | - Lan Guan
- Department of Cell Physiology and Molecular Biophysics, Center for Membrane Protein Research, School of Medicine, Texas Tech University Health Sciences Center, Lubbock, Texas 79430, United States
| | - Brian K Kobilka
- Department of Molecular and Cellular Physiology, Stanford University, Stanford, California 94305, United States
| | - Sandro Keller
- Technische Universität Kaiserslautern (TUK), Erwin-Schrödinger-Str. 13, 67663 Kaiserslautern, Germany.,Institute of Molecular Biosciences (IMB), NAWI Graz, University of Graz, Humboldtstr. 50/III, 8010 Graz, Austria.,Field of Excellence BioHealth, University of Graz, 8010 Graz, Austria.,BioTechMed-Graz, Graz, Austria
| | - Pil Seok Chae
- Department of Bionanotechnology, Center for Bionano Intelligence Education and Research, Hanyang University, Ansan 155-88, Korea
| |
Collapse
|
32
|
Bonnet C, Guillet P, Mahler F, Igonet S, Keller S, Jawhari A, Durand G. Detergent‐Like Polymerizable Monomers: Synthesis, Physicochemical, and Biochemical Characterization. European J Org Chem 2020. [DOI: 10.1002/ejoc.202000540] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Christophe Bonnet
- Chimie Bioorganique et Systèmes amphiphiles Institut des Biomolécules Max Mousseron (UMR 5247 UM‐CNRS‐ENSCM) & Avignon University 301 rue Baruch de Spinoza – 84916 AVIGNON cedex 9 France
- CHEM2STAB 301 rue Baruch de Spinoza – 84916 AVIGNON cedex 9 France
| | - Pierre Guillet
- Chimie Bioorganique et Systèmes amphiphiles Institut des Biomolécules Max Mousseron (UMR 5247 UM‐CNRS‐ENSCM) & Avignon University 301 rue Baruch de Spinoza – 84916 AVIGNON cedex 9 France
- CHEM2STAB 301 rue Baruch de Spinoza – 84916 AVIGNON cedex 9 France
| | - Florian Mahler
- Molecular Biophysics Technische Universität Kaiserslautern (TUK) Erwin‐Schrödinger‐Str. 13 67663 Kaiserslautern Germany
| | - Sébastien Igonet
- CHEM2STAB 301 rue Baruch de Spinoza – 84916 AVIGNON cedex 9 France
- CALIXAR 60A Avenue Rockefeller – 69008 Lyon France
| | - Sandro Keller
- Molecular Biophysics Technische Universität Kaiserslautern (TUK) Erwin‐Schrödinger‐Str. 13 67663 Kaiserslautern Germany
| | - Anass Jawhari
- CHEM2STAB 301 rue Baruch de Spinoza – 84916 AVIGNON cedex 9 France
- CALIXAR 60A Avenue Rockefeller – 69008 Lyon France
| | - Grégory Durand
- Chimie Bioorganique et Systèmes amphiphiles Institut des Biomolécules Max Mousseron (UMR 5247 UM‐CNRS‐ENSCM) & Avignon University 301 rue Baruch de Spinoza – 84916 AVIGNON cedex 9 France
- CHEM2STAB 301 rue Baruch de Spinoza – 84916 AVIGNON cedex 9 France
| |
Collapse
|
33
|
Adão R, Cruz PF, Vaz DC, Fonseca F, Pedersen JN, Ferreira-da-Silva F, Brito RM, Ramos CH, Otzen D, Keller S, Bastos M. DIBMA nanodiscs keep α-synuclein folded. Biochimica et Biophysica Acta (BBA) - Biomembranes 2020; 1862:183314. [DOI: 10.1016/j.bbamem.2020.183314] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/23/2019] [Revised: 04/10/2020] [Accepted: 04/13/2020] [Indexed: 02/08/2023]
|
34
|
Danielczak B, Keller S. Lipid exchange among polymer-encapsulated nanodiscs by time-resolved Förster resonance energy transfer. Methods 2020; 180:27-34. [DOI: 10.1016/j.ymeth.2020.04.010] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2020] [Revised: 04/20/2020] [Accepted: 04/28/2020] [Indexed: 12/30/2022] Open
|
35
|
Egloff S, Reichler IM, Kowalewski MP, Keller S, Goericke-Pesch S, Balogh O. Uterine expression of smooth muscle alpha- and gamma-actin and smooth muscle myosin in bitches diagnosed with uterine inertia and obstructive dystocia. Theriogenology 2020; 156:162-170. [PMID: 32750597 DOI: 10.1016/j.theriogenology.2020.06.033] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2020] [Revised: 06/15/2020] [Accepted: 06/27/2020] [Indexed: 02/03/2023]
Abstract
Primary uterine inertia (PUI) is the most common type of dystocia in dogs. We hypothesized that PUI develops because of lower than normal expression of the basic contractile elements in the uterus, i.e., smooth muscle (SM) α- and γ-actin and SM-myosin, and that the expression of these proteins is influenced by the number of fetuses present in utero. Full-thickness inter-placental uterine biopsies were collected during Cesarean sections from dogs with PUI (n = 11), and from bitches with obstructive dystocia (OD) still presenting strong labor contractions (designated as the control group, n = 7). Relative gene expression was determined by semi-quantitative real-time (TaqMan) PCR, and protein localization by immunohistochemistry. Gene expression between PUI and OD bitches, and between PUI bitches carrying small, large, or average number of fetuses according to their breed, were compared. Uterine SM-γ-actin and SM-myosin mRNA levels were significantly higher in PUI than in OD dogs, while SM-α-actin did not differ. PUI bitches carrying large litters had lower uterine SM-γ-actin gene expression than those with small litters (P = 0.008). Immunostaining for SM-actin isoforms and SM-myosin was present in the myometrium, and localization pattern and staining intensity appeared similar in the PUI and OD groups. All proteins stained in blood vessels, and SM-γ-actin was also present in endometrial luminal and glandular epithelium. In conclusion, higher uterine SM-γ-actin and SM-myosin gene expression in PUI bitches, compared with OD dogs, might be an indication of abnormal progression with labor. Whether this is the cause of PUI due to an intrinsic error of the myometrium not becoming committed to labor, or the consequence of inadequate endocrine or mechanical stimuli, is not clear. Litter size was previously shown to be one of the risk factors for the development of uterine inertia in dogs, and our findings suggest possible differing uterine pathophysiology of PUI with respect to litter size.
Collapse
Affiliation(s)
- S Egloff
- Clinic of Reproductive Medicine, Vetsuisse Faculty, University of Zurich, Winterthurerstrasse 260, 8057, Zurich, Switzerland
| | - I M Reichler
- Clinic of Reproductive Medicine, Vetsuisse Faculty, University of Zurich, Winterthurerstrasse 260, 8057, Zurich, Switzerland
| | - M P Kowalewski
- Institute of Veterinary Anatomy, Vetsuisse Faculty, University of Zurich, Winterthurerstrasse 260, 8057, Zurich, Switzerland
| | - S Keller
- Clinic of Reproductive Medicine, Vetsuisse Faculty, University of Zurich, Winterthurerstrasse 260, 8057, Zurich, Switzerland
| | - S Goericke-Pesch
- Section for Veterinary Reproduction and Obstetrics, Department of Veterinary Clinical Sciences, University of Copenhagen, Frederiksberg, Denmark; Reproductive Unit of the Clinic - Clinic for Small Animals, University of Veterinary Medicine Hannover, Bünteweg 15, 30559, Hannover, Germany
| | - O Balogh
- Clinic of Reproductive Medicine, Vetsuisse Faculty, University of Zurich, Winterthurerstrasse 260, 8057, Zurich, Switzerland; Department of Small Animal Clinical Sciences, Virginia-Maryland College of Veterinary Medicine, 215 Duck Pond Dr, Blacksburg, VA, 24061, USA.
| |
Collapse
|
36
|
Paller AS, Seyger MMB, Alejandro Magariños G, Bagel J, Pinter A, Cather J, Keller S, Rodriguez Capriles C, Gontijo Lima R, Gallo G, Little CA, Edson-Heredia E, Li L, Xu W, Papp K. Efficacy and safety of ixekizumab in a phase III, randomized, double-blind, placebo-controlled study in paediatric patients with moderate-to-severe plaque psoriasis (IXORA-PEDS). Br J Dermatol 2020; 183:231-241. [PMID: 32316070 PMCID: PMC7496501 DOI: 10.1111/bjd.19147] [Citation(s) in RCA: 61] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/12/2020] [Indexed: 01/02/2023]
Abstract
Background Plaque psoriasis affects children and adults, but treatment options for paediatric psoriasis are limited. Objectives To evaluate the efficacy and safety of ixekizumab (IXE), a high‐affinity monoclonal antibody that selectively targets interleukin‐17A, for moderate‐to‐severe paediatric psoriasis. Methods In a randomized, double‐blind, placebo‐controlled, phase III study (IXORA‐PEDS), patients aged 6 to < 18 years with moderate‐to‐severe plaque psoriasis were randomized 2 : 1 to weight‐based dosing of IXE every 4 weeks (IXE Q4W, n = 115) or placebo (n = 56) through week 12, followed by open‐label IXE Q4W. Coprimary endpoints were the proportions of patients at week 12 achieving ≥ 75% improvement in Psoriasis Area and Severity Index (PASI 75) and those achieving a static Physician's Global Assessment score of 0 or 1 (sPGA 0,1). Results IXE was superior (P < 0·001) to placebo for both coprimary endpoints of PASI 75 (IXE Q4W, 89%; placebo, 25%) and sPGA (0,1) (IXE Q4W, 81%; placebo, 11%). IXE was also superior for all gated secondary endpoints, including PASI 75 and sPGA (0,1) at week 4, improvement in itch, and complete skin clearance. IXE Q4W provided significant (P < 0·001) improvements vs. placebo in quality of life and clearance of scalp and genital psoriasis. Responses at week 12 were sustained or further improved through week 48. Through week 12, 45% (placebo) and 56% (IXE) of patients reported treatment‐emergent adverse events. One serious adverse event was reported (IXE), one patient discontinued due to an adverse event (placebo) and no deaths were reported. Conclusions IXE was superior to placebo in the treatment of moderate‐to‐severe paediatric psoriasis, and the safety profile was generally consistent with that observed in adults. What is already known about this topic? Paediatric psoriasis affects approximately 1% of children and can negatively impact health‐related quality of life. Treatment options for paediatric psoriasis are typically limited to off‐label treatments and approved systemic biologics. Ixekizumab, a high‐affinity monoclonal antibody that selectively targets interleukin‐17A, is approved for moderate‐to‐severe plaque psoriasis in adults and was recently approved by the US Food and Drug Administration for moderate‐to‐severe paediatric psoriasis.
What does this study add? Ixekizumab resulted in rapid and statistically significant improvements over placebo in skin involvement, itch and health‐related quality of life, which persisted through 48 weeks of treatment in paediatric patients with moderate‐to‐severe plaque psoriasis. The safety profile of ixekizumab was generally consistent with that seen in adults. Ixekizumab may be an additional potential therapeutic option and an additional class of biologic therapy (interleukin‐17A antagonist) for the treatment of moderate‐to‐severe paediatric psoriasis.
Plain language summary available online
Collapse
Affiliation(s)
- A S Paller
- Department of Dermatology, Northwestern University Feinberg School of Medicine, Chicago, IL, USA
| | - M M B Seyger
- Department of Dermatology, Radboud University Medical Center, Nijmegen, the Netherlands
| | | | - J Bagel
- Psoriasis Treatment Center of Central New Jersey, East Windsor, NJ, USA
| | - A Pinter
- Department of Dermatology, Venereology and Allergology, University Hospital Frankfurt, Frankfurt am Main, Germany
| | - J Cather
- Mindful Dermatology and Modern Research Associates, Dallas, TX, USA
| | - S Keller
- Eli Lilly and Company, Indianapolis, IN, USA
| | | | | | - G Gallo
- Eli Lilly and Company, Indianapolis, IN, USA
| | - C A Little
- Eli Lilly and Company, Indianapolis, IN, USA
| | | | - L Li
- Eli Lilly and Company, Indianapolis, IN, USA
| | - W Xu
- Eli Lilly and Company, Indianapolis, IN, USA
| | - K Papp
- K Papp Clinical Research and Probity Medical Research, Waterloo, ON, Canada
| | | |
Collapse
|
37
|
Tso SC, Mahler F, Höring J, Keller S, Brautigam CA. Fast and Robust Quantification of Detergent Micellization Thermodynamics from Isothermal Titration Calorimetry. Anal Chem 2019; 92:1154-1161. [PMID: 31829010 DOI: 10.1021/acs.analchem.9b04281] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Detergents are widely used in modern in vitro biochemistry and biophysics, in particular to aid the characterization of integral membrane proteins. An important characteristic of these chemicals in aqueous solutions is the concentration above which their molecular monomers self-associate to form micelles, termed the critical micellar concentration (CMC). Micelles are supramolecular assemblies arranged with the hydrophobic portions oriented inward and the hydrophilic head groups positioned outward to interact with the aqueous solvent. Knowledge of the CMC is not only of practical relevance but also of theoretical interest because it provides thermodynamic insights. Isothermal titration calorimetry (ITC) is a powerful method to determine CMCs, as it furnishes additional information on the enthalpy and entropy of micellization. Here we describe our extension of previous methods to determine CMCs and other thermodynamic parameters from ITC demicellization curves. The new algorithm, incorporated into the stand-alone software package D/STAIN, analyzes ITC demicellization curves by taking advantage of state-of-the-art thermogram-integration techniques and automatically providing rigorous confidence intervals on the refined parameters. As a demonstration of the software's capabilities, we undertook ITC experiments to determine the respective CMCs of n-octyl β-d-glucopyranoside (OG), n-dodecyl β-d-maltopyranoside (DDM), and lauryldimethylamine N-oxide (LDAO). Motivated by the fact that in vitro membrane protein studies often require additives such as precipitants (e.g., polyethylene glycol (PEG)), we also carried out ITC demicellization studies in the presence of PEG3350, finding in all cases that PEG had significant effects on the thermodynamics of detergent micellization.
Collapse
Affiliation(s)
| | - Florian Mahler
- Molecular Biophysics , Technische Universität Kaiserslautern (TUK) , Erwin-Schrödinger-Str. 13 , 67663 Kaiserslautern , Germany
| | - Jonas Höring
- Molecular Biophysics , Technische Universität Kaiserslautern (TUK) , Erwin-Schrödinger-Str. 13 , 67663 Kaiserslautern , Germany
| | - Sandro Keller
- Molecular Biophysics , Technische Universität Kaiserslautern (TUK) , Erwin-Schrödinger-Str. 13 , 67663 Kaiserslautern , Germany
| | | |
Collapse
|
38
|
Shendi D, Marzi J, Linthicum W, Rickards A, Dolivo D, Keller S, Kauss M, Wen Q, McDevitt T, Dominko T, Schenke-Layland K, Rolle M. Hyaluronic acid as a macromolecular crowding agent for production of cell-derived matrices. Acta Biomater 2019; 100:292-305. [PMID: 31568877 DOI: 10.1016/j.actbio.2019.09.042] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2019] [Revised: 09/19/2019] [Accepted: 09/26/2019] [Indexed: 12/18/2022]
Abstract
Cell-derived matrices (CDMs) provide an exogenous source of human extracellular matrix (ECM), with applications as cell delivery vehicles, substrate coatings for cell attachment and differentiation, and as biomaterial scaffolds. However, commercial application of CDMs has been hindered due to the prolonged culture time required for sufficient ECM accumulation. One approach to increasing matrix deposition in vitro is macromolecular crowding (MMC), which is a biophysical phenomenon that limits the diffusion of ECM precursor proteins, resulting in increased ECM accumulation at the cell layer. Hyaluronic acid (HA), a natural MMC highly expressed in vivo during fetal development, has been shown to play a role in ECM production, but has not been investigated as a macromolecule for increasing cell-mediated ECM deposition in vitro. In the current study, we hypothesized that HA can act as a MMC, and increase cell-mediated ECM production. Human dermal fibroblasts were cultured for 3, 7, or 14 days with 0%, 0.05%, or 0.5% high molecular weight HA. Ficoll 70/400 was used as a positive control. SDS-PAGE, Sircol, and hydroxyproline assays indicated that 0.05% HA-treated cultures had significantly higher mean collagen deposition at 14 days, whereas Ficoll 70/400-treated cultures had significantly lower collagen production compared to the HA and untreated controls. However, fluorescent immunostaining of ECM proteins and quantification of mean gray values did not indicate statistically significant differences in ECM production in HA or Ficoll 70/400-treated cultures compared to untreated controls. Raman imaging (a marker-free spectral imaging method) indicated that HA increased ECM deposition in human dermal fibroblasts. These results are consistent with decreases in CDM stiffness observed in Ficoll 70/400-treated cultures by atomic force microscopy. Overall, these results indicate that there are macromolecule- and cell type- dependent effects on matrix assembly, turnover, and stiffness in cell-derived matrices. STATEMENT OF SIGNIFICANCE: Cell-derived matrices (CDMs) are versatile biomaterials with many regenerative medicine applications, including as cell and drug delivery vehicles and scaffolds for wound healing and tissue regeneration. While CDMs have several advantages, their commercialization has been limited due to the prolonged culture time required to achieve CDM synthesis in vitro. In this study, we explored the use of hyaluronic acid (HA) as a macromolecular crowder in human fibroblast cell cultures to support production of CDM biomaterials. Successful application of macromolecular crowding will allow development of human cell-derived, xeno-free biomaterials that re-capitulate the native human tissue microenvironment.
Collapse
|
39
|
Höfer CT, Di Lella S, Dahmani I, Jungnick N, Bordag N, Bobone S, Huan Q, Keller S, Herrmann A, Chiantia S. Corrigendum to "Structural determinants of the interaction between influenza A virus matrix protein M1 and lipid membranes" [Biochim. Biophys. Acta Biomembr. 1861 (2019) 1123-1134]. Biochim Biophys Acta Biomembr 2019; 1861:183014. [PMID: 31320107 DOI: 10.1016/j.bbamem.2019.07.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Affiliation(s)
- C T Höfer
- Institute for Biology, IRI Life Sciences, Humboldt-Universität zu Berlin, Invalidenstraße 42, 10115 Berlin, Germany; University of Potsdam, Institute of Biochemistry and Biology, Karl-Liebknecht-Str. 24-25, 14476 Potsdam, Germany; Leibniz-Institute for Molecular Pharmacology (FMP), Biophysics of Membrane Proteins, Robert-Roessle-Str. 10, 13125 Berlin, Germany; School of Life Sciences, Fudan University, 220 Handan Rd, WuJiaoChang, Yangpu Qu, Shanghai Shi 200433, China; Molecular Biophysics, Technische Universität Kaiserslautern (TUK), Erwin-Schrödinger-Str. 13, 67663 Kaiserslautern, Germany
| | - S Di Lella
- Institute for Biology, IRI Life Sciences, Humboldt-Universität zu Berlin, Invalidenstraße 42, 10115 Berlin, Germany; University of Potsdam, Institute of Biochemistry and Biology, Karl-Liebknecht-Str. 24-25, 14476 Potsdam, Germany; Leibniz-Institute for Molecular Pharmacology (FMP), Biophysics of Membrane Proteins, Robert-Roessle-Str. 10, 13125 Berlin, Germany; School of Life Sciences, Fudan University, 220 Handan Rd, WuJiaoChang, Yangpu Qu, Shanghai Shi 200433, China; Molecular Biophysics, Technische Universität Kaiserslautern (TUK), Erwin-Schrödinger-Str. 13, 67663 Kaiserslautern, Germany
| | - I Dahmani
- Institute for Biology, IRI Life Sciences, Humboldt-Universität zu Berlin, Invalidenstraße 42, 10115 Berlin, Germany; University of Potsdam, Institute of Biochemistry and Biology, Karl-Liebknecht-Str. 24-25, 14476 Potsdam, Germany; Leibniz-Institute for Molecular Pharmacology (FMP), Biophysics of Membrane Proteins, Robert-Roessle-Str. 10, 13125 Berlin, Germany; School of Life Sciences, Fudan University, 220 Handan Rd, WuJiaoChang, Yangpu Qu, Shanghai Shi 200433, China; Molecular Biophysics, Technische Universität Kaiserslautern (TUK), Erwin-Schrödinger-Str. 13, 67663 Kaiserslautern, Germany
| | - N Jungnick
- Institute for Biology, IRI Life Sciences, Humboldt-Universität zu Berlin, Invalidenstraße 42, 10115 Berlin, Germany; University of Potsdam, Institute of Biochemistry and Biology, Karl-Liebknecht-Str. 24-25, 14476 Potsdam, Germany; Leibniz-Institute for Molecular Pharmacology (FMP), Biophysics of Membrane Proteins, Robert-Roessle-Str. 10, 13125 Berlin, Germany; School of Life Sciences, Fudan University, 220 Handan Rd, WuJiaoChang, Yangpu Qu, Shanghai Shi 200433, China; Molecular Biophysics, Technische Universität Kaiserslautern (TUK), Erwin-Schrödinger-Str. 13, 67663 Kaiserslautern, Germany
| | - N Bordag
- Institute for Biology, IRI Life Sciences, Humboldt-Universität zu Berlin, Invalidenstraße 42, 10115 Berlin, Germany; University of Potsdam, Institute of Biochemistry and Biology, Karl-Liebknecht-Str. 24-25, 14476 Potsdam, Germany; Leibniz-Institute for Molecular Pharmacology (FMP), Biophysics of Membrane Proteins, Robert-Roessle-Str. 10, 13125 Berlin, Germany; School of Life Sciences, Fudan University, 220 Handan Rd, WuJiaoChang, Yangpu Qu, Shanghai Shi 200433, China; Molecular Biophysics, Technische Universität Kaiserslautern (TUK), Erwin-Schrödinger-Str. 13, 67663 Kaiserslautern, Germany
| | - S Bobone
- Institute for Biology, IRI Life Sciences, Humboldt-Universität zu Berlin, Invalidenstraße 42, 10115 Berlin, Germany; University of Potsdam, Institute of Biochemistry and Biology, Karl-Liebknecht-Str. 24-25, 14476 Potsdam, Germany; Leibniz-Institute for Molecular Pharmacology (FMP), Biophysics of Membrane Proteins, Robert-Roessle-Str. 10, 13125 Berlin, Germany; School of Life Sciences, Fudan University, 220 Handan Rd, WuJiaoChang, Yangpu Qu, Shanghai Shi 200433, China; Molecular Biophysics, Technische Universität Kaiserslautern (TUK), Erwin-Schrödinger-Str. 13, 67663 Kaiserslautern, Germany
| | - Q Huan
- Institute for Biology, IRI Life Sciences, Humboldt-Universität zu Berlin, Invalidenstraße 42, 10115 Berlin, Germany; University of Potsdam, Institute of Biochemistry and Biology, Karl-Liebknecht-Str. 24-25, 14476 Potsdam, Germany; Leibniz-Institute for Molecular Pharmacology (FMP), Biophysics of Membrane Proteins, Robert-Roessle-Str. 10, 13125 Berlin, Germany; School of Life Sciences, Fudan University, 220 Handan Rd, WuJiaoChang, Yangpu Qu, Shanghai Shi 200433, China; Molecular Biophysics, Technische Universität Kaiserslautern (TUK), Erwin-Schrödinger-Str. 13, 67663 Kaiserslautern, Germany
| | - S Keller
- Institute for Biology, IRI Life Sciences, Humboldt-Universität zu Berlin, Invalidenstraße 42, 10115 Berlin, Germany; University of Potsdam, Institute of Biochemistry and Biology, Karl-Liebknecht-Str. 24-25, 14476 Potsdam, Germany; Leibniz-Institute for Molecular Pharmacology (FMP), Biophysics of Membrane Proteins, Robert-Roessle-Str. 10, 13125 Berlin, Germany; School of Life Sciences, Fudan University, 220 Handan Rd, WuJiaoChang, Yangpu Qu, Shanghai Shi 200433, China; Molecular Biophysics, Technische Universität Kaiserslautern (TUK), Erwin-Schrödinger-Str. 13, 67663 Kaiserslautern, Germany
| | - A Herrmann
- Institute for Biology, IRI Life Sciences, Humboldt-Universität zu Berlin, Invalidenstraße 42, 10115 Berlin, Germany; University of Potsdam, Institute of Biochemistry and Biology, Karl-Liebknecht-Str. 24-25, 14476 Potsdam, Germany; Leibniz-Institute for Molecular Pharmacology (FMP), Biophysics of Membrane Proteins, Robert-Roessle-Str. 10, 13125 Berlin, Germany; School of Life Sciences, Fudan University, 220 Handan Rd, WuJiaoChang, Yangpu Qu, Shanghai Shi 200433, China; Molecular Biophysics, Technische Universität Kaiserslautern (TUK), Erwin-Schrödinger-Str. 13, 67663 Kaiserslautern, Germany.
| | - S Chiantia
- Institute for Biology, IRI Life Sciences, Humboldt-Universität zu Berlin, Invalidenstraße 42, 10115 Berlin, Germany; University of Potsdam, Institute of Biochemistry and Biology, Karl-Liebknecht-Str. 24-25, 14476 Potsdam, Germany; Leibniz-Institute for Molecular Pharmacology (FMP), Biophysics of Membrane Proteins, Robert-Roessle-Str. 10, 13125 Berlin, Germany; School of Life Sciences, Fudan University, 220 Handan Rd, WuJiaoChang, Yangpu Qu, Shanghai Shi 200433, China; Molecular Biophysics, Technische Universität Kaiserslautern (TUK), Erwin-Schrödinger-Str. 13, 67663 Kaiserslautern, Germany.
| |
Collapse
|
40
|
Chandiramani R, Chen H, Cao D, Claessen B, Blum M, Goel R, Sartori S, Aquino M, Guedeney P, Effron M, Keller S, Baker B, Pocock S, Baber U, Mehran R. P1760Incidence and effects of stroke, MI and bleeding on mortality among patients with ACS undergoing PCI: a comparative analysis from the PROMETHEUS registry. Eur Heart J 2019. [DOI: 10.1093/eurheartj/ehz748.0513] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Abstract
Background
Stroke represents a potentially calamitous complication among patients with acute coronary syndrome (ACS) undergoing percutaneous coronary intervention (PCI) even though its rates are relatively low. Data on the distribution of stroke occurrence over time and its overlap with myocardial infarction (MI) and bleeding after PCI is scarce.
Purpose
We sought to compare the occurrence and impacts of stroke, MI and bleeding on subsequent mortality in ACS patients undergoing PCI in contemporary clinical practice.
Methods
A total of 19,914 ACS patients who underwent PCI in the PROMETHEUS multi-center observational study were analyzed. We calculated the cumulative stroke incidence at 30 days and 1 year using Kaplan Meier (KM) method. We also compared the distribution of stroke, myocardial infarction (MI) and bleeding across time and evaluated the overlap between their occurrences. Predictors of 1 year stroke occurrence were identified through multivariable Cox-regression and stroke, MI and bleeding were entered as time-updated covariates to estimate their individual effects on subsequent mortality.
Results
Of the total number of patients, 244 patients (1.5%) had a stroke within 1 year. 48 of these patients also experienced an MI while another 48 patients experienced a bleeding event. Furthermore, 14 of these overlapping patients experienced a stroke, MI and bleeding event, all within the 1-year follow-up. Patients who sustained a stroke were more likely to have a prior history of cerebrovascular disease, peripheral artery disease, MI and heart failure compared to those who did not have a stroke. Mortality risk was significantly higher among those with stroke versus those without stroke (adjusted HR 4.84, p<0.0001). However, the association attenuated over time with a much larger effect in the first 30 days of its occurrence (adjusted HR 17.7, p<0.0001) versus beyond 30 days (adjusted HR 1.22; 95% CI: 0.6–2.46, p=0.58). Although the effects of MI and bleeding on subsequent mortality within 30 days of occurrence were significantly lower than stroke (adjusted HR 6.22, p<0.0001; adjusted HR 7.30, p<0.0001, respectively), their effects were more sustained on mortality beyond 30 days (adjusted HR 2.89, p<0.0001; adjusted HR 3.05, p<0.0001, respectively).
Conclusion
When compared with MI and bleeding, stroke had a substantially stronger impact on mortality that attenuated rapidly over time among ACS patients undergoing PCI. Optimization of modifiable risk factors and medication adherence are essential parts of management of stroke following PCI for ACS.
Collapse
Affiliation(s)
- R Chandiramani
- The Zena and Michael A. Wiener Cardiovascular Institute, New York, United States of America
| | - H Chen
- The Zena and Michael A. Wiener Cardiovascular Institute, New York, United States of America
| | - D Cao
- The Zena and Michael A. Wiener Cardiovascular Institute, New York, United States of America
| | - B Claessen
- The Zena and Michael A. Wiener Cardiovascular Institute, New York, United States of America
| | - M Blum
- The Zena and Michael A. Wiener Cardiovascular Institute, New York, United States of America
| | - R Goel
- The Zena and Michael A. Wiener Cardiovascular Institute, New York, United States of America
| | - S Sartori
- The Zena and Michael A. Wiener Cardiovascular Institute, New York, United States of America
| | - M Aquino
- The Zena and Michael A. Wiener Cardiovascular Institute, New York, United States of America
| | - P Guedeney
- The Zena and Michael A. Wiener Cardiovascular Institute, New York, United States of America
| | - M Effron
- Eli Lilly and Company, Indianapolis, United States of America
| | - S Keller
- Eli Lilly and Company, Indianapolis, United States of America
| | - B Baker
- Daiichi-Sankyo, Inc, Parsippany, United States of America
| | - S Pocock
- London School of Hygiene and Tropical Medicine, London, United Kingdom
| | - U Baber
- The Zena and Michael A. Wiener Cardiovascular Institute, New York, United States of America
| | - R Mehran
- The Zena and Michael A. Wiener Cardiovascular Institute, New York, United States of America
| |
Collapse
|
41
|
Krainer G, Keller S, Schlierf M. Structural dynamics of membrane-protein folding from single-molecule FRET. Curr Opin Struct Biol 2019; 58:124-137. [DOI: 10.1016/j.sbi.2019.05.025] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2019] [Accepted: 05/27/2019] [Indexed: 12/15/2022]
|
42
|
Bonnet C, Guillet P, Igonet S, Meister A, Marconnet A, Keller S, Jawhari A, Durand G. Hybrid Double-Chain Maltose-Based Detergents: Synthesis and Colloidal and Biochemical Evaluation. J Org Chem 2019; 84:10606-10614. [PMID: 31414599 DOI: 10.1021/acs.joc.9b00873] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Four hybrid double-chain surfactants with a maltose polar head were synthesized. The apolar domain consists of a hydrogenated chain, and a partially fluorinated chain made of a propyl hydrogenated spacer terminated by a perfluorinated core of various lengths. Their water solubility was found to be lower than 1 g/L irrespective of the length of both chains. The self-assembling properties of pure hybrids in water were studied by dynamic light scattering and transmission electron microscopy, which revealed the formation of two populations of aggregates with diameters of 8-50 nm and 80-300 nm. When mixed with the classical detergent n-dodecylmaltoside (DDM), the four hybrids were well soluble and formed small mixed micelles. DDM/hybrid mixtures were further evaluated for the extraction of the full-length, wild-type human GPCR adenosine receptor (A2AR), and the bacterial transporter AcrB. The solubilization of A2AR showed extraction efficiencies ranging from 40 to 70%, while that of AcrB reached 60-90%. Finally, three of the hybrids exhibited significant thermostabilization when present as additives. The derivative with a C12-hydrogenated chain and a C4F9-fluorinated chain emerged as the most potent additive exhibiting both good extraction yields of A2AR and AcrB and thermostabilization of A2AR by ∼7 °C.
Collapse
Affiliation(s)
- Christophe Bonnet
- Equipe Chimie Bioorganique et Systèmes Amphiphiles , Institut des Biomolécules Max Mousseron (UMR 5247 UM-CNRS-ENSCM) & Avignon University , 301 rue Baruch de Spinoza , 84916 Avignon cedex 9 , France.,CHEM2STAB , 301 rue Baruch de Spinoza , 84916 Avignon cedex 9 , France
| | - Pierre Guillet
- Equipe Chimie Bioorganique et Systèmes Amphiphiles , Institut des Biomolécules Max Mousseron (UMR 5247 UM-CNRS-ENSCM) & Avignon University , 301 rue Baruch de Spinoza , 84916 Avignon cedex 9 , France.,CHEM2STAB , 301 rue Baruch de Spinoza , 84916 Avignon cedex 9 , France
| | - Sébastien Igonet
- CHEM2STAB , 301 rue Baruch de Spinoza , 84916 Avignon cedex 9 , France.,CALIXAR , 60 Avenue Rockefeller , 69008 Lyon , France
| | - Annette Meister
- ZIK HALOmem and Institute of Biochemistry and Biotechnology , Martin Luther University Halle-Wittenberg , Kurt-Mothes-Str. 3a , D-06120 Halle/Saale , Germany
| | - Anaïs Marconnet
- Equipe Chimie Bioorganique et Systèmes Amphiphiles , Institut des Biomolécules Max Mousseron (UMR 5247 UM-CNRS-ENSCM) & Avignon University , 301 rue Baruch de Spinoza , 84916 Avignon cedex 9 , France.,CHEM2STAB , 301 rue Baruch de Spinoza , 84916 Avignon cedex 9 , France
| | - Sandro Keller
- Molecular Biophysics , Technische Universität Kaiserslautern (TUK) , Erwin-Schrödinger-Str. 13 , 67663 Kaiserslautern , Germany
| | - Anass Jawhari
- CHEM2STAB , 301 rue Baruch de Spinoza , 84916 Avignon cedex 9 , France.,CALIXAR , 60 Avenue Rockefeller , 69008 Lyon , France
| | - Grégory Durand
- Equipe Chimie Bioorganique et Systèmes Amphiphiles , Institut des Biomolécules Max Mousseron (UMR 5247 UM-CNRS-ENSCM) & Avignon University , 301 rue Baruch de Spinoza , 84916 Avignon cedex 9 , France.,CHEM2STAB , 301 rue Baruch de Spinoza , 84916 Avignon cedex 9 , France
| |
Collapse
|
43
|
Ehsan M, Du Y, Mortensen JS, Hariharan P, Qu Q, Ghani L, Das M, Grethen A, Byrne B, Skiniotis G, Keller S, Loland CJ, Guan L, Kobilka BK, Chae PS. Self-Assembly Behavior and Application of Terphenyl-Cored Trimaltosides for Membrane-Protein Studies: Impact of Detergent Hydrophobic Group Geometry on Protein Stability. Chemistry 2019; 25:11545-11554. [PMID: 31243822 DOI: 10.1002/chem.201902468] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2019] [Indexed: 01/13/2023]
Abstract
Amphipathic agents are widely used in various fields including biomedical sciences. Micelle-forming detergents are particularly useful for in vitro membrane-protein characterization. As many conventional detergents are limited in their ability to stabilize membrane proteins, it is necessary to develop novel detergents to facilitate membrane-protein research. In the current study, we developed novel trimaltoside detergents with an alkyl pendant-bearing terphenyl unit as a hydrophobic group, designated terphenyl-cored maltosides (TPMs). We found that the geometry of the detergent hydrophobic group substantially impacts detergent self-assembly behavior, as well as detergent efficacy for membrane-protein stabilization. TPM-Vs, with a bent terphenyl group, were superior to the linear counterparts (TPM-Ls) at stabilizing multiple membrane proteins. The favorable protein stabilization efficacy of these bent TPMs is likely associated with a binding mode with membrane proteins distinct from conventional detergents and facial amphiphiles. When compared to n-dodecyl-β-d-maltoside (DDM), most TPMs were superior or comparable to this gold standard detergent at stabilizing membrane proteins. Notably, TPM-L3 was particularly effective at stabilizing the human β2 adrenergic receptor (β2 AR), a G-protein coupled receptor, and its complex with Gs protein. Thus, the current study not only provides novel detergent tools that are useful for membrane-protein study, but also suggests a critical role for detergent hydrophobic group geometry in governing detergent efficacy.
Collapse
Affiliation(s)
- Muhammad Ehsan
- Department of Bionanotechnology, Hanyang University, Ansan, 15588, Korea.,Current address: Department of Chemistry, Mirpur University of Science & Technology, Mirpur, AJK, 10250, Pakistan)
| | - Yang Du
- Molecular and Cellular Physiology, Stanford, CA, 94305, USA
| | - Jonas S Mortensen
- Department of Neuroscience, University of Copenhagen, 2200, Copenhagen, Denmark
| | - Parameswaran Hariharan
- Department of Cell Physiology and Molecular Biophysics, Center for Membrane Protein Research, School of Medicine, Texas Tech University Health Sciences Center Lubbock, TX, 79430, USA
| | - Qianhui Qu
- Molecular and Cellular Physiology and Structural Biology, Stanford University, Stanford, CA, 94305, USA
| | - Lubna Ghani
- Department of Bionanotechnology, Hanyang University, Ansan, 15588, Korea
| | - Manabendra Das
- Molecular Biophysics, Technische Universität Kaiserslautern (TUK), Erwin-Schrödinger-Str. 13, 67663, Kaiserslautern, Germany
| | - Anne Grethen
- Molecular Biophysics, Technische Universität Kaiserslautern (TUK), Erwin-Schrödinger-Str. 13, 67663, Kaiserslautern, Germany
| | - Bernadette Byrne
- Department of Life Sciences, Imperial College London, London, SW7 2AZ, UK
| | - Georgios Skiniotis
- Molecular and Cellular Physiology and Structural Biology, Stanford University, Stanford, CA, 94305, USA
| | - Sandro Keller
- Molecular Biophysics, Technische Universität Kaiserslautern (TUK), Erwin-Schrödinger-Str. 13, 67663, Kaiserslautern, Germany
| | - Claus J Loland
- Department of Neuroscience, University of Copenhagen, 2200, Copenhagen, Denmark
| | - Lan Guan
- Department of Cell Physiology and Molecular Biophysics, Center for Membrane Protein Research, School of Medicine, Texas Tech University Health Sciences Center Lubbock, TX, 79430, USA
| | | | - Pil Seok Chae
- Department of Bionanotechnology, Hanyang University, Ansan, 15588, Korea
| |
Collapse
|
44
|
Danielczak B, Meister A, Keller S. Influence of Mg2+ and Ca2+ on nanodisc formation by diisobutylene/maleic acid (DIBMA) copolymer. Chem Phys Lipids 2019; 221:30-38. [DOI: 10.1016/j.chemphyslip.2019.03.004] [Citation(s) in RCA: 36] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2018] [Revised: 03/08/2019] [Accepted: 03/11/2019] [Indexed: 11/15/2022]
|
45
|
August A, Schmidt N, Klingler J, Baumkötter F, Lechner M, Klement J, Eggert S, Vargas C, Wild K, Keller S, Kins S. Copper and zinc ions govern the trans‐directed dimerization of APP family members in multiple ways. J Neurochem 2019; 151:626-641. [DOI: 10.1111/jnc.14716] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2018] [Revised: 04/29/2019] [Accepted: 04/29/2019] [Indexed: 12/21/2022]
Affiliation(s)
- Alexander August
- Division of Human Biology and Human GeneticsTechnische Universität Kaiserslautern (TUK) Kaiserslautern Germany
| | - Nadine Schmidt
- Division of Human Biology and Human GeneticsTechnische Universität Kaiserslautern (TUK) Kaiserslautern Germany
| | - Johannes Klingler
- Molecular Biophysics Technische Universität Kaiserslautern (TUK) Kaiserslautern Germany
| | - Frederik Baumkötter
- Division of Human Biology and Human GeneticsTechnische Universität Kaiserslautern (TUK) Kaiserslautern Germany
| | - Marius Lechner
- Division of Human Biology and Human GeneticsTechnische Universität Kaiserslautern (TUK) Kaiserslautern Germany
| | - Jessica Klement
- Molecular Biophysics Technische Universität Kaiserslautern (TUK) Kaiserslautern Germany
| | - Simone Eggert
- Division of Human Biology and Human GeneticsTechnische Universität Kaiserslautern (TUK) Kaiserslautern Germany
| | - Carolyn Vargas
- Molecular Biophysics Technische Universität Kaiserslautern (TUK) Kaiserslautern Germany
| | - Klemens Wild
- Heidelberg University Biochemistry Center (BZH) University of Heidelberg Heidelberg Germany
| | - Sandro Keller
- Molecular Biophysics Technische Universität Kaiserslautern (TUK) Kaiserslautern Germany
| | - Stefan Kins
- Division of Human Biology and Human GeneticsTechnische Universität Kaiserslautern (TUK) Kaiserslautern Germany
| |
Collapse
|
46
|
Guillet P, Mahler F, Garnier K, Nyame Mendendy Boussambe G, Igonet S, Vargas C, Ebel C, Soulié M, Keller S, Jawhari A, Durand G. Hydrogenated Diglucose Detergents for Membrane-Protein Extraction and Stabilization. Langmuir 2019; 35:4287-4295. [PMID: 30767533 DOI: 10.1021/acs.langmuir.8b02842] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
We report herein the design and synthesis of a novel series of alkyl glycoside detergents consisting of a nonionic polar headgroup that comprises two glucose moieties in a branched arrangement (DG), onto which octane-, decane-, and dodecanethiols were grafted leading to ODG, DDG, and DDDG detergents, respectively. Micellization in aqueous solution was studied by isothermal titration calorimetry, 1H NMR spectroscopy, and surface tensiometry. Critical micellar concentration values were found to decrease by a factor of ∼10 for each pair of methylene groups added to the alkyl chain, ranging from ∼0.05 to 9 mM for DDDG and ODG, respectively. Dynamic light scattering and analytical ultracentrifugation sedimentation velocity experiments were used to investigate the size and composition of the micellar aggregates, showing that the aggregation number significantly increased from ∼40 for ODG to ∼80 for DDDG. All new compounds were able to solubilize membrane proteins (MPs) from bacterial membranes, insect cells, as well as the Madin-Darby canine kidney cells. In particular, native human adenosine receptor (A2AR) and bacterial transporter (BmrA) were solubilized efficiently. Striking thermostability improvements of +13 and +8 °C were observed when ODG and DDG were, respectively, applied to wild-type and full-length A2AR. Taken together, this novel detergent series shows promising detergent potency for solubilization and stabilization of membrane proteins (MPs) and thus makes a valuable addition to the chemical toolbox available for extracting and handling these important but challenging MP targets.
Collapse
Affiliation(s)
- Pierre Guillet
- Equipe Chimie Bioorganique et Systèmes Amphiphiles , Institut des Biomolécules Max Mousseron (UMR 5247 UM-CNRS-ENSCM) & Avignon University , 301 rue Baruch de Spinoza , 84916 Avignon cedex 9, France
- CHEM2STAB , 301 rue Baruch de Spinoza , 84916 Avignon cedex 9, France
| | - Florian Mahler
- Molecular Biophysics , Technische Universität Kaiserslautern (TUK) , Erwin-Schrödinger-Str. 13 , 67663 Kaiserslautern , Germany
| | - Kelly Garnier
- CHEM2STAB , 301 rue Baruch de Spinoza , 84916 Avignon cedex 9, France
- CALIXAR , 60 Avenue Rockefeller , 69008 Lyon , France
| | - Gildas Nyame Mendendy Boussambe
- Equipe Chimie Bioorganique et Systèmes Amphiphiles , Institut des Biomolécules Max Mousseron (UMR 5247 UM-CNRS-ENSCM) & Avignon University , 301 rue Baruch de Spinoza , 84916 Avignon cedex 9, France
- CHEM2STAB , 301 rue Baruch de Spinoza , 84916 Avignon cedex 9, France
| | - Sébastien Igonet
- CHEM2STAB , 301 rue Baruch de Spinoza , 84916 Avignon cedex 9, France
- CALIXAR , 60 Avenue Rockefeller , 69008 Lyon , France
| | - Carolyn Vargas
- Molecular Biophysics , Technische Universität Kaiserslautern (TUK) , Erwin-Schrödinger-Str. 13 , 67663 Kaiserslautern , Germany
| | - Christine Ebel
- Univ. Grenoble Alpes, CNRS, CEA, CNRS, IBS , F-38000 Grenoble , France
| | - Marine Soulié
- Equipe Chimie Bioorganique et Systèmes Amphiphiles , Institut des Biomolécules Max Mousseron (UMR 5247 UM-CNRS-ENSCM) & Avignon University , 301 rue Baruch de Spinoza , 84916 Avignon cedex 9, France
- CHEM2STAB , 301 rue Baruch de Spinoza , 84916 Avignon cedex 9, France
| | - Sandro Keller
- Molecular Biophysics , Technische Universität Kaiserslautern (TUK) , Erwin-Schrödinger-Str. 13 , 67663 Kaiserslautern , Germany
| | - Anass Jawhari
- CHEM2STAB , 301 rue Baruch de Spinoza , 84916 Avignon cedex 9, France
- CALIXAR , 60 Avenue Rockefeller , 69008 Lyon , France
| | - Grégory Durand
- Equipe Chimie Bioorganique et Systèmes Amphiphiles , Institut des Biomolécules Max Mousseron (UMR 5247 UM-CNRS-ENSCM) & Avignon University , 301 rue Baruch de Spinoza , 84916 Avignon cedex 9, France
- CHEM2STAB , 301 rue Baruch de Spinoza , 84916 Avignon cedex 9, France
| |
Collapse
|
47
|
Höfer CT, Di Lella S, Dahmani I, Jungnick N, Bordag N, Bobone S, Huang Q, Keller S, Herrmann A, Chiantia S. Structural determinants of the interaction between influenza A virus matrix protein M1 and lipid membranes. Biochim Biophys Acta Biomembr 2019; 1861:1123-1134. [PMID: 30902626 DOI: 10.1016/j.bbamem.2019.03.013] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/28/2019] [Accepted: 03/16/2019] [Indexed: 11/26/2022]
Abstract
Influenza A virus is a pathogen responsible for severe seasonal epidemics threatening human and animal populations every year. One of the ten major proteins encoded by the viral genome, the matrix protein M1, is abundantly produced in infected cells and plays a structural role in determining the morphology of the virus. During assembly of new viral particles, M1 is recruited to the host cell membrane where it associates with lipids and other viral proteins. The structure of M1 is only partially known. In particular, structural details of M1 interactions with the cellular plasma membrane as well as M1-protein interactions and multimerization have not been clarified, yet. In this work, we employed a set of complementary experimental and theoretical tools to tackle these issues. Using raster image correlation, surface plasmon resonance and circular dichroism spectroscopies, we quantified membrane association and oligomerization of full-length M1 and of different genetically engineered M1 constructs (i.e., N- and C-terminally truncated constructs and a mutant of the polybasic region, residues 95-105). Furthermore, we report novel information on structural changes in M1 occurring upon binding to membranes. Our experimental results are corroborated by an all-atom model of the full-length M1 protein bound to a negatively charged lipid bilayer.
Collapse
Affiliation(s)
- C T Höfer
- Institute for Biology, IRI Life Sciences, Humboldt-Universität zu Berlin, Invalidenstraße 42, 10115, Berlin, Germany
| | - S Di Lella
- Institute for Biology, IRI Life Sciences, Humboldt-Universität zu Berlin, Invalidenstraße 42, 10115, Berlin, Germany
| | - I Dahmani
- University of Potsdam, Institute of Biochemistry and Biology, Karl-Liebknecht-Str. 24-25, 14476 Potsdam, Germany
| | - N Jungnick
- Institute for Biology, IRI Life Sciences, Humboldt-Universität zu Berlin, Invalidenstraße 42, 10115, Berlin, Germany
| | - N Bordag
- Leibniz-Institute for Molecular Pharmacology (FMP), Biophysics of Membrane Proteins, Robert-Roessle-Str. 10, 13125 Berlin, Germany
| | - S Bobone
- University of Potsdam, Institute of Biochemistry and Biology, Karl-Liebknecht-Str. 24-25, 14476 Potsdam, Germany
| | - Q Huang
- School of Life Sciences, Fudan University, 220 Handan Rd, WuJiaoChang, Yangpu Qu, Shanghai Shi 200433, China
| | - S Keller
- Molecular Biophysics, Technische Universität Kaiserslautern (TUK), Erwin-Schrödinger-Str. 13, 67663 Kaiserslautern, Germany
| | - A Herrmann
- Institute for Biology, IRI Life Sciences, Humboldt-Universität zu Berlin, Invalidenstraße 42, 10115, Berlin, Germany.
| | - S Chiantia
- University of Potsdam, Institute of Biochemistry and Biology, Karl-Liebknecht-Str. 24-25, 14476 Potsdam, Germany.
| |
Collapse
|
48
|
Rohr M, Ries F, Herkt C, Gotsmann VL, Westrich LD, Gries K, Trösch R, Christmann J, Chaux-Jukic F, Jung M, Zimmer D, Mühlhaus T, Sommer F, Schroda M, Keller S, Möhlmann T, Willmund F. The Role of Plastidic Trigger Factor Serving Protein Biogenesis in Green Algae and Land Plants. Plant Physiol 2019; 179:1093-1110. [PMID: 30651302 PMCID: PMC6393800 DOI: 10.1104/pp.18.01252] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/16/2018] [Accepted: 01/07/2019] [Indexed: 05/07/2023]
Abstract
Biochemical processes in chloroplasts are important for virtually all life forms. Tight regulation of protein homeostasis and the coordinated assembly of protein complexes, composed of both imported and locally synthesized subunits, are vital to plastid functionality. Protein biogenesis requires the action of cotranslationally acting molecular chaperones. One such chaperone is trigger factor (TF), which is known to cotranslationally bind most newly synthesized proteins in bacteria, thereby assisting their correct folding and maturation. However, how these processes are regulated in chloroplasts remains poorly understood. We report here functional investigation of chloroplast-localized TF (TIG1) in the green alga (Chlamydomonas reinhardtii) and the vascular land plant Arabidopsis (Arabidopsis thaliana). We show that chloroplastic TIG1 evolved as a specialized chaperone. Unlike other plastidic chaperones that are functionally interchangeable with their prokaryotic counterpart, TIG1 was not able to complement the broadly acting ortholog in Escherichia coli. Whereas general chaperone properties such as the prevention of aggregates or substrate recognition seems to be conserved between bacterial and plastidic TFs, plant TIG1s differed by associating with only a relatively small population of translating ribosomes. Furthermore, a reduction of plastidic TIG1 levels leads to deregulated protein biogenesis at the expense of increased translation, thereby disrupting the chloroplast energy household. This suggests a central role of TIG1 in protein biogenesis in the chloroplast.
Collapse
Affiliation(s)
- Marina Rohr
- Molecular Genetics of Eukaryotes, University of Kaiserslautern, Paul-Ehrlich-Strasse 23, 67663 Kaiserslautern, Germany
| | - Fabian Ries
- Molecular Genetics of Eukaryotes, University of Kaiserslautern, Paul-Ehrlich-Strasse 23, 67663 Kaiserslautern, Germany
| | - Claudia Herkt
- Molecular Genetics of Eukaryotes, University of Kaiserslautern, Paul-Ehrlich-Strasse 23, 67663 Kaiserslautern, Germany
| | - Vincent Leon Gotsmann
- Molecular Genetics of Eukaryotes, University of Kaiserslautern, Paul-Ehrlich-Strasse 23, 67663 Kaiserslautern, Germany
| | - Lisa Désirée Westrich
- Molecular Genetics of Eukaryotes, University of Kaiserslautern, Paul-Ehrlich-Strasse 23, 67663 Kaiserslautern, Germany
| | - Karin Gries
- Molecular Genetics of Eukaryotes, University of Kaiserslautern, Paul-Ehrlich-Strasse 23, 67663 Kaiserslautern, Germany
| | - Raphael Trösch
- Molecular Genetics of Eukaryotes, University of Kaiserslautern, Paul-Ehrlich-Strasse 23, 67663 Kaiserslautern, Germany
| | - Jens Christmann
- Molecular Genetics of Eukaryotes, University of Kaiserslautern, Paul-Ehrlich-Strasse 23, 67663 Kaiserslautern, Germany
| | | | - Martin Jung
- Medical Biochemistry and Molecular Biology, Building 44, Saarland University, 66421 Homburg, Germany
| | - David Zimmer
- Computational Systems Biology, University of Kaiserslautern, Paul-Ehrlich-Strasse 23, 67663 Kaiserslautern, Germany
| | - Timo Mühlhaus
- Computational Systems Biology, University of Kaiserslautern, Paul-Ehrlich-Strasse 23, 67663 Kaiserslautern, Germany
| | - Frederik Sommer
- Molecular Biotechnology and Systems Biology, University of Kaiserslautern, Paul-Ehrlich-Strasse 23, 67663 Kaiserslautern, Germany
| | - Michael Schroda
- Molecular Biotechnology and Systems Biology, University of Kaiserslautern, Paul-Ehrlich-Strasse 23, 67663 Kaiserslautern, Germany
| | - Sandro Keller
- Molecular Biophysics, University of Kaiserslautern, Paul-Ehrlich-Strasse 23, 67663 Kaiserslautern, Germany
| | - Torsten Möhlmann
- Plant Physiology, University of Kaiserslautern, Paul-Ehrlich Strasse 22, 67663 Kaiserslautern, Germany
| | - Felix Willmund
- Molecular Genetics of Eukaryotes, University of Kaiserslautern, Paul-Ehrlich-Strasse 23, 67663 Kaiserslautern, Germany
| |
Collapse
|
49
|
Keller S, Gorantla V, Aaltonen E, Kulkarni K, McDermott M. 03:27 PM Abstract No. 134 Superior hypogastric nerve block for post-procedure pain control after uterine artery embolization. J Vasc Interv Radiol 2019. [DOI: 10.1016/j.jvir.2018.12.183] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
|
50
|
Wieshmann UC, Chawira A, Keller S, Baker G. TP3-1 Memory impairment in epilepsy. J Neurol Neurosurg Psychiatry 2019. [DOI: 10.1136/jnnp-2019-abn.56] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
ObjectivesMemory impairment is an extremely common complaint in people with epilepsy (PWE). The purpose of our cross sectional study was to identify factors associated with self-reported memory impairment in PWE.Methods514 PWE and 52 controls completed the Liverpool Adverse Event Profile, a 19 item questionnaire which includes items on memory and depression and provided clinical data on age, sex, medication, seizure onset, frequency and severity. For memory impairment, sleep disturbance, depression and seizure type scores were dichotomised into minor deficits (Likert scores 1 and 2), and major deficits (Likert scores 3 and 4).ResultsIn univariate analysis we found significant associations for mono vs polytherapy (χ2=14.85, p<0.001); minor/major depression (χ2=29.41, p<0.001); minor/major sleep disturbance (χ2=65.34, p<0.001); seizure freedom/persistence (χ2=14.40, p<0.001), the number of seizures in the last four weeks (p<0.001, U=17530.50, z=−5.11, but not sex, mean age of onset, mean duration of epilepsy or seizure type. Multinomial logistic regression revealed that sleep disturbance (p<0.001), AED poly therapy (p=0.004), depression (p<0.001) all retained significance whereas seizure persistence did not (p=0.377). Applying ANOVA to examine mean age with memory deficit outcomes, older age was significantly linked to poorer memory (F=3.34, p=0.002).ConclusionsSleep disturbance, poly therapy and depression are potentially treatable factors associated with self-reported memory impairment in PWE.
Collapse
|