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Ali S, de Gracia Lux C, Brown K, Endsley C, Woodward A, Mattrey R, Lux J. Modulating Nonlinear Acoustic Response of Phospholipid-Coated Microbubbles with pH for Ultrasound Imaging. ACS Sens 2024; 9:2356-2363. [PMID: 38752383 DOI: 10.1021/acssensors.3c02382] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/25/2024]
Abstract
Activatable microbubble contrast agents for contrast-enhanced ultrasound have a potential role for measuring physiologic and pathologic states in deep tissues, including tumor acidosis. In this study, we describe a novel observation of increased harmonic oscillation of phosphatidylcholine microbubbles (PC-MBs) in response to lower ambient pH using a clinical ultrasound scanner. MB echogenicity and nonlinear echoes were monitored at neutral and acidic pH using B-mode and Cadence contrast pulse sequencing (CPS), a harmonic imaging technique at 7.0 and 1.5 MHz. A 3-fold increase in harmonic signal intensity was observed when the pH of PC-MB suspensions was decreased from 7.4 to 5.5 to mimic normal and pathophysiological levels that can be encountered in vivo. This pH-mediated activation is tunable based on the chemical structure and length of phospholipids composing the MB shell. It is also reliant on the presence of phosphate groups, as the use of lipids without phosphate instead of phospholipids completely abrogated this phenomenon. The increased harmonic signal likely is the result of increased MB oscillation caused by a decrease of the interfacial tension induced at a lower pH, altering the lipid conformation. While relative signal changes are interpreted clinically as mostly related to blood flow, pH effects could be significant contributors, particularly when imaging tumors. While our observation can be used clinically, it requires further research to isolate the effect of pH from other variables. These findings could pave the way toward for the development of new smart ultrasound contrast agents that expand the clinical utility of contrast-enhanced ultrasound.
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Affiliation(s)
- Shariq Ali
- Department of Radiology, University of Texas Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, Texas 75390-8514, United States
| | - Caroline de Gracia Lux
- Department of Radiology, University of Texas Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, Texas 75390-8514, United States
| | - Katherine Brown
- Department of Bioengineering, University of Texas at Dallas, 800 West Campbell Road, Richardson, Texas 75080-3021, United States
| | - Connor Endsley
- Department of Radiology, University of Texas Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, Texas 75390-8514, United States
| | - Adam Woodward
- Department of Radiology, University of Texas Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, Texas 75390-8514, United States
| | - Robert Mattrey
- Department of Radiology, University of Texas Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, Texas 75390-8514, United States
| | - Jacques Lux
- Department of Radiology, University of Texas Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, Texas 75390-8514, United States
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2
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Duché G, Sanderson JM. The Chemical Reactivity of Membrane Lipids. Chem Rev 2024; 124:3284-3330. [PMID: 38498932 PMCID: PMC10979411 DOI: 10.1021/acs.chemrev.3c00608] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2023] [Revised: 02/27/2024] [Accepted: 02/28/2024] [Indexed: 03/20/2024]
Abstract
It is well-known that aqueous dispersions of phospholipids spontaneously assemble into bilayer structures. These structures have numerous applications across chemistry and materials science and form the fundamental structural unit of the biological membrane. The particular environment of the lipid bilayer, with a water-poor low dielectric core surrounded by a more polar and better hydrated interfacial region, gives the membrane particular biophysical and physicochemical properties and presents a unique environment for chemical reactions to occur. Many different types of molecule spanning a range of sizes, from dissolved gases through small organics to proteins, are able to interact with membranes and promote chemical changes to lipids that subsequently affect the physicochemical properties of the bilayer. This Review describes the chemical reactivity exhibited by lipids in their membrane form, with an emphasis on conditions where the lipids are well hydrated in the form of bilayers. Key topics include the following: lytic reactions of glyceryl esters, including hydrolysis, aminolysis, and transesterification; oxidation reactions of alkenes in unsaturated fatty acids and sterols, including autoxidation and oxidation by singlet oxygen; reactivity of headgroups, particularly with reactive carbonyl species; and E/Z isomerization of alkenes. The consequences of reactivity for biological activity and biophysical properties are also discussed.
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Affiliation(s)
- Genevieve Duché
- Génie
Enzimatique et Cellulaire, Université
Technologique de Compiègne, Compiègne 60200, France
| | - John M Sanderson
- Chemistry
Department, Durham University, Durham DH1 3LE, United Kingdom
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3
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Leomil FC, Stephan M, Pramanik S, Riske KA, Dimova R. Bilayer Charge Asymmetry and Oil Residues Destabilize Membranes upon Poration. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2024; 40:4719-4731. [PMID: 38373285 PMCID: PMC10919074 DOI: 10.1021/acs.langmuir.3c03370] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/05/2023] [Revised: 01/03/2024] [Accepted: 01/05/2024] [Indexed: 02/21/2024]
Abstract
Transmembrane asymmetry is ubiquitous in cells, particularly with respect to lipids, where charged lipids are mainly restricted to one monolayer. We investigate the influence of anionic lipid asymmetry on the stability of giant unilamellar vesicles (GUVs), minimal plasma membrane models. To quantify asymmetry, we apply the fluorescence quenching assay, which is often difficult to reproduce, and caution in handling the quencher is generally underestimated. We first optimize this assay and then apply it to GUVs prepared with the inverted emulsion transfer protocol by using increasing fractions of anionic lipids restricted to one leaflet. This protocol is found to produce highly asymmetric bilayers but with ∼20% interleaflet mixing. To probe the stability of asymmetric versus symmetric membranes, we expose the GUVs to porating electric pulses and monitor the fraction of destabilized vesicles. The pulses open macropores, and the GUVs either completely recover or exhibit leakage or bursting/collapse. Residual oil destabilizes porated membranes, and destabilization is even more pronounced in asymmetrically charged membranes. This is corroborated by the measured pore edge tension, which is also found to decrease with increasing charge asymmetry. Using GUVs with imposed transmembrane pH asymmetry, we confirm that poration-triggered destabilization does not depend on the approach used to generate membrane asymmetry.
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Affiliation(s)
- Fernanda
S. C. Leomil
- Max
Planck Institute of Colloids and Interfaces, 14776 Potsdam, Germany
- Departamento
de Biofísica, Universidade Federal
de São Paulo, São
Paulo 04039-032, Brazil
| | - Mareike Stephan
- Max
Planck Institute of Colloids and Interfaces, 14776 Potsdam, Germany
| | - Shreya Pramanik
- Max
Planck Institute of Colloids and Interfaces, 14776 Potsdam, Germany
| | - Karin A. Riske
- Departamento
de Biofísica, Universidade Federal
de São Paulo, São
Paulo 04039-032, Brazil
| | - Rumiana Dimova
- Max
Planck Institute of Colloids and Interfaces, 14776 Potsdam, Germany
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4
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Rogers NMK, McCumber AW, McMillan HM, McNamara RP, Dittmer DP, Kuehn MJ, Hendren CO, Wiesner MR. Comparative electrokinetic properties of extracellular vesicles produced by yeast and bacteria. Colloids Surf B Biointerfaces 2023; 225:113249. [PMID: 36905832 PMCID: PMC10085849 DOI: 10.1016/j.colsurfb.2023.113249] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2022] [Revised: 02/13/2023] [Accepted: 03/04/2023] [Indexed: 03/08/2023]
Abstract
Extracellular vesicles (EVs) are nano-sized, biocolloidal proteoliposomes that have been shown to be produced by all cell types studied to date and are ubiquitous in the environment. Extensive literature on colloidal particles has demonstrated the implications of surface chemistry on transport behavior. Hence, one may anticipate that physicochemical properties of EVs, particularly surface charge-associated properties, may influence EV transport and specificity of interactions with surfaces. Here we compare the surface chemistry of EVs as expressed by zeta potential (calculated from electrophoretic mobility measurements). The zeta potentials of EVs produced by Pseudomonas fluorescens, Staphylococcus aureus, and Saccharomyces cerevisiae were largely unaffected by changes in ionic strength and electrolyte type, but were affected by changes in pH. The addition of humic acid altered the calculated zeta potential of the EVs, especially for those from S. cerevisiae. Differences in zeta potential were compared between EVs and their respective parent cell with no consistent trend emerging; however, significant differences were discovered between the different cell types and their EVs. These findings imply that, while EV surface charge (as estimated from zeta potential) is relatively insensitive to the evaluated environmental conditions, EVs from different organisms can differ regarding which conditions will cause colloidal instability.
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Affiliation(s)
- Nicholas M K Rogers
- Department of Mechanical Engineering, Tel Aviv University, Tel Aviv 69978, Israel; Porter School of Earth and Environmental Studies, Tel Aviv University, Tel Aviv 69978, Israel.
| | - Alexander W McCumber
- Department of Environmental Sciences and Engineering, University of North Carolina Chapel Hill, Chapel Hill, NC, USA
| | - Hannah M McMillan
- Department of Molecular Genetics and Microbiology, Duke University, Durham, NC, USA
| | - Ryan P McNamara
- Department of Microbiology and Immunology, University of North Carolina Chapel Hill, Chapel Hill, NC, USA
| | - Dirk P Dittmer
- Department of Microbiology and Immunology, University of North Carolina Chapel Hill, Chapel Hill, NC, USA
| | - Meta J Kuehn
- Department of Biochemistry, Duke University, Durham, NC, USA; Department of Molecular Genetics and Microbiology, Duke University, Durham, NC, USA
| | - Christine Ogilvie Hendren
- Center for the Environmental Implications of Nanotechnology, Duke University, Durham, NC, USA; Department of Geological and Environmental Sciences, Appalachian State University, Boone, NC, USA; Research Institute for Environment, Energy and Economics, Appalachian State University, Boone, NC, USA
| | - Mark R Wiesner
- Department of Civil & Environmental Engineering, Duke University, Durham, NC, USA; Center for the Environmental Implications of Nanotechnology, Duke University, Durham, NC, USA
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5
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Trollmann MFW, Böckmann RA. mRNA lipid nanoparticle phase transition. Biophys J 2022; 121:3927-3939. [PMID: 36045573 PMCID: PMC9674992 DOI: 10.1016/j.bpj.2022.08.037] [Citation(s) in RCA: 20] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2022] [Revised: 08/06/2022] [Accepted: 08/25/2022] [Indexed: 11/28/2022] Open
Abstract
Crucial for mRNA-based vaccines are the composition, structure, and properties of lipid nanoparticles (LNPs) as their delivery vehicle. Using all-atom molecular dynamics simulations as a computational microscope, we provide an atomistic view of the structure of the Comirnaty vaccine LNP, its molecular organization, physicochemical properties, and insight in its pH-driven phase transition enabling mRNA release at atomistic resolution. At physiological pH, our simulations suggest an oil-like LNP core that is composed of the aminolipid ALC-0315 and cholesterol (ratio 72:28). It is surrounded by a lipid monolayer formed by distearoylphosphatidylcholine, ALC-0315, PEGylated lipids, and cholesterol at a ratio of 22:9:6:63. Protonated aminolipids enveloping mRNA formed inverted micellar structures that provide a shielding and likely protection from environmental factors. In contrast, at low pH, the Comirnaty lipid composition instead spontaneously formed lipid bilayers that display a high degree of elasticity. These pH-dependent lipid phases suggest that a change in pH of the environment upon LNP transfer to the endosome likely acts as trigger for cargo release from the LNP core by turning aminolipids inside out, thereby destabilizing both the LNP shell and the endosomal membrane.
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Affiliation(s)
- Marius F W Trollmann
- Computational Biology, Department of Biology, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany; Erlangen National Center for High-Performance Computing (NHR@FAU), Erlangen, Germany
| | - Rainer A Böckmann
- Computational Biology, Department of Biology, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany; Erlangen National Center for High-Performance Computing (NHR@FAU), Erlangen, Germany.
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6
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Nonlinear electric response of the diffuse double layer to an abrupt charge displacement inside a biological membrane. Bioelectrochemistry 2022; 146:108138. [DOI: 10.1016/j.bioelechem.2022.108138] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2022] [Revised: 04/15/2022] [Accepted: 04/20/2022] [Indexed: 12/18/2022]
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7
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Guidelli R, Becucci L. Functional activity of peptide ion channels in tethered bilayer lipid membranes: Review. ELECTROCHEMICAL SCIENCE ADVANCES 2021. [DOI: 10.1002/elsa.202100180] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Affiliation(s)
- Rolando Guidelli
- Department of Chemistry University of Florence Sesto Fiorentino Firenze Italy
| | - Lucia Becucci
- Ministero dell'Istruzione Scuola Media “Guglielmo Marconi” San Giovanni Valdarno Arezzo Italy
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8
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Biswas B, Singh PC. Signature of the surface hydrated proton and associated restructuring of water at model membrane interfaces: a vibrational sum frequency generation study. Phys Chem Chem Phys 2021; 23:14764-14769. [PMID: 34196339 DOI: 10.1039/d1cp01486b] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Hydrated proton at membrane interfaces plays an important role in the bioenergetic process of almost all organisms. Herein, the signature of the hydrated proton at membrane interfaces has been investigated by measuring the vibrational sum frequency generated (VSFG) spectra of negatively charged and zwitterionic lipids in the presence of different concentrations of acids. The addition of acids decreases the intensity of the OH stretch of the VSFG signal of water present at the negatively charged and zwitterionic lipids along with the enhanced intensity of the broad VSFG signal in the range of 2500-2800 cm-1. The enhanced intensity of the broad continuum observed in the range of 2500-2800 cm-1 has been assigned to the signature of the hydrated proton at the lipid interfaces. The decrease in the VSFG signal of the OH stretch of water along with the appearance of the broad signal suggests that the hydrated proton exists in the vicinity of the lipid interfaces and restructures the interaction between the interfacial water molecules.
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Affiliation(s)
- Biswajit Biswas
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata, 700032, India.
| | - Prashant Chandra Singh
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata, 700032, India.
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9
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Tanabe Y, Nishibayashi Y. Comprehensive insights into synthetic nitrogen fixation assisted by molecular catalysts under ambient or mild conditions. Chem Soc Rev 2021; 50:5201-5242. [PMID: 33651046 DOI: 10.1039/d0cs01341b] [Citation(s) in RCA: 64] [Impact Index Per Article: 21.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
N2 is fixed as NH3 industrially by the Haber-Bosch process under harsh conditions, whereas biological nitrogen fixation is achieved under ambient conditions, which has prompted development of alternative methods to fix N2 catalyzed by transition metal molecular complexes. Since the early 21st century, catalytic conversion of N2 into NH3 under ambient conditions has been achieved by using molecular catalysts, and now H2O has been utilized as a proton source with turnover frequencies reaching the values found for biological nitrogen fixation. In this review, recent advances in the development of molecular catalysts for synthetic N2 fixation under ambient or mild conditions are summarized, and potential directions for future research are also discussed.
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Affiliation(s)
- Yoshiaki Tanabe
- Department of Applied Chemistry, School of Engineering, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.
| | - Yoshiaki Nishibayashi
- Department of Applied Chemistry, School of Engineering, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.
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10
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11
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Liu J, Li X, Liu L, Bai Q, Sui N, Zhu Z. Self-assembled ultrasmall silver nanoclusters on liposome for topical antimicrobial delivery. Colloids Surf B Biointerfaces 2021; 200:111618. [DOI: 10.1016/j.colsurfb.2021.111618] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2020] [Revised: 12/16/2020] [Accepted: 02/03/2021] [Indexed: 10/22/2022]
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12
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Shields SWJ, Rosales CA, Roberts JA, Pallister PJ, Wasslen KV, Manthorpe JM, Smith JC. iTrEnDi: In Situ Trimethylation Enhancement Using Diazomethane: Improved and Expanded Glycerophospholipid and Sphingolipid Analyses via a Microscale Autonomous Derivatization Platform. Anal Chem 2021; 93:1084-1091. [PMID: 33300778 DOI: 10.1021/acs.analchem.0c04088] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Trimethylation enhancement using diazomethane (TrEnDi) is a derivatization technique that significantly enhances the signal intensity of glycerophospholipid species in mass spectrometry (MS) and tandem mass spectrometry (MS/MS) analyses. Here, we describe a novel apparatus that is able to conduct in situ TrEnDi (iTrEnDi) by generating and immediately reacting small amounts of gaseous diazoalkane with analyte molecules. iTrEnDi allows complete and rapid methylation of phosphatidylcholine (PC), phosphatidylethanolamine (PE), phosphatidic acid (PA), and sphingomyelin (SM) in a safe manner by removing any need for direct handling of dangerous diazoalkane solutions. iTrEnDi-modified PC ([PCTr]+) and PE ([PETr]+) showed similar sensitivity enhancements and fragmentation patterns compared to our previously reported methodology. iTrEnDi yielded dimethylated PA ([PATr]), which exhibited dramatically improved chromatographic behavior and a 14-fold increase in liquid chromatography MS (LCMS) sensitivity compared to unmodified PA. In comparison to in-solution-based TrEnDi, iTrEnDi demonstrated a modest decrease in sensitivity, likely due to analyte losses during handling. However, the enhanced safety benefits of iTrEnDi coupled with its ease of use and capacity for automation, as well as its accommodation of more-reactive diazoalkane species, vastly improve the accessibility and utility of this derivatization technique. Finally, as a proof of concept, iTrEnDi was used to produce diazoethane (DZE), a more-reactive diazoalkane than diazomethane. Reaction between DZE and PC yielded ethylated [PCTr]+, which fragmented via MS/MS to produce a high-intensity characteristic fragment ion, enabling a novel and highly sensitive precursor ion scan.
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Affiliation(s)
- Samuel W J Shields
- Department of Chemistry, Carleton University, Ottawa, Ontario K1S 5B6, Canada.,Carleton Mass Spectrometry Centre, Carleton University, Ottawa, Ontario K1S 5B6, Canada
| | - Christian A Rosales
- Department of Chemistry, Carleton University, Ottawa, Ontario K1S 5B6, Canada.,Carleton Mass Spectrometry Centre, Carleton University, Ottawa, Ontario K1S 5B6, Canada
| | - Joshua A Roberts
- Institute of Biochemistry, Carleton University, Ottawa, Ontario K1S 5B6, Canada.,Carleton Mass Spectrometry Centre, Carleton University, Ottawa, Ontario K1S 5B6, Canada
| | - Peter J Pallister
- Department of Chemistry, Carleton University, Ottawa, Ontario K1S 5B6, Canada.,Carleton Mass Spectrometry Centre, Carleton University, Ottawa, Ontario K1S 5B6, Canada
| | - Karl V Wasslen
- Department of Chemistry, Carleton University, Ottawa, Ontario K1S 5B6, Canada.,Carleton Mass Spectrometry Centre, Carleton University, Ottawa, Ontario K1S 5B6, Canada
| | - Jeffrey M Manthorpe
- Department of Chemistry, Carleton University, Ottawa, Ontario K1S 5B6, Canada.,Institute of Biochemistry, Carleton University, Ottawa, Ontario K1S 5B6, Canada.,Carleton Mass Spectrometry Centre, Carleton University, Ottawa, Ontario K1S 5B6, Canada
| | - Jeffrey C Smith
- Department of Chemistry, Carleton University, Ottawa, Ontario K1S 5B6, Canada.,Institute of Biochemistry, Carleton University, Ottawa, Ontario K1S 5B6, Canada.,Carleton Mass Spectrometry Centre, Carleton University, Ottawa, Ontario K1S 5B6, Canada
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13
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Wen Y, Vogt VM, Feigenson GW. PI(4,5)P 2 Clustering and Its Impact on Biological Functions. Annu Rev Biochem 2021; 90:681-707. [PMID: 33441034 DOI: 10.1146/annurev-biochem-070920-094827] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Located at the inner leaflet of the plasma membrane (PM), phosphatidyl-inositol 4,5-bisphosphate [PI(4,5)P2] composes only 1-2 mol% of total PM lipids. With its synthesis and turnover both spatially and temporally regulated, PI(4,5)P2 recruits and interacts with hundreds of cellular proteins to support a broad spectrum of cellular functions. Several factors contribute to the versatile and dynamic distribution of PI(4,5)P2 in membranes. Physiological multivalent cations such as Ca2+ and Mg2+ can bridge between PI(4,5)P2 headgroups, forming nanoscopic PI(4,5)P2-cation clusters. The distinct lipid environment surrounding PI(4,5)P2 affects the degree of PI(4,5)P2 clustering. In addition, diverse cellular proteins interacting with PI(4,5)P2 can further regulate PI(4,5)P2 lateral distribution and accessibility. This review summarizes the current understanding of PI(4,5)P2 behavior in both cells and model membranes, with emphasis on both multivalent cation- and protein-induced PI(4,5)P2 clustering. Understanding the nature of spatially separated pools of PI(4,5)P2 is fundamental to cell biology.
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Affiliation(s)
- Yi Wen
- Department of Molecular Biology and Genetics, Cornell University, Ithaca, New York 14850, USA; , ,
| | - Volker M Vogt
- Department of Molecular Biology and Genetics, Cornell University, Ithaca, New York 14850, USA; , ,
| | - Gerald W Feigenson
- Department of Molecular Biology and Genetics, Cornell University, Ithaca, New York 14850, USA; , ,
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14
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Kataoka-Hamai C, Kawakami K. Determination of the Coverage of Phosphatidylcholine Monolayers Formed at Silicone Oil–Water Interfaces by Vesicle Fusion. J Phys Chem B 2020; 124:8719-8727. [DOI: 10.1021/acs.jpcb.0c06310] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Chiho Kataoka-Hamai
- Research Center for Functional Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
| | - Kohsaku Kawakami
- Research Center for Functional Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
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15
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Salminen H, Bischoff S, Weiss J. Formation and stability of emulsions stabilized by Quillaja saponin-egg lecithin mixtures. J Food Sci 2020; 85:1213-1222. [PMID: 32249411 DOI: 10.1111/1750-3841.15104] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2019] [Revised: 02/03/2020] [Accepted: 02/14/2020] [Indexed: 11/27/2022]
Abstract
Knowledge of binary emulsifiers' influence on the formation and stability of emulsion-based products is still limited. The aim of this study was to investigate the emulsifying properties of Quillaja saponin-egg lecithin mixtures at different concentration ratios (r = 5:0, 4:1, 3:2, 2:3, 1:4, and 0:5) with total emulsifier concentration set to 0.5% or 1.0% (w/w). For this, oil-in-water emulsions (10% oil, pH 7) were prepared via high-pressure homogenization. Furthermore, emulsion stability against different environmental stresses was tested. All the binary emulsifier mixtures formed submicron sized emulsions upon homogenization. The most stable emulsions among the mixed emulsifiers were obtained at low Quillaja saponin concentration at r = 1:4 that showed similar physical stability over time to emulsions stabilized by Quillaja saponins and egg lecithin alone. The data suggested that the mixtures of Quillaja saponins and egg lecithins built mixed interfacial layers that were prone to changes over time. Emulsions stabilized by the binary mixtures were in general less stable against changes in pH and ionic strength than the emulsions stabilized by the individual emulsifiers. An exception were the emulsions at r = 1:4 that showed improved stability at pH 2 over the phase separated Quillaja saponin-stabilized emulsions at the same pH. Moreover, all the emulsions were heat stable up to 90 °C. On the other hand, none of the emulsions were stable upon freeze-thawing. These results increase our understanding of technofunctionality of binary emulsifier systems. PRACTICAL APPLICATION: Food-grade and natural emulsifier mixtures composed of Quillaja saponins and egg lecithin may be used in selected emulsion-based food or personal care product applications to replace synthetic surfactants due to issues with consumer acceptance and regulatory restrictions.
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Affiliation(s)
- Hanna Salminen
- Department of Food Physics and Meat Science, Institute of Food Science and Biotechnology, University of Hohenheim, Garbenstraße 21/25, Stuttgart, 70599, Germany
| | - Sonja Bischoff
- Department of Food Physics and Meat Science, Institute of Food Science and Biotechnology, University of Hohenheim, Garbenstraße 21/25, Stuttgart, 70599, Germany
| | - Jochen Weiss
- Department of Food Physics and Meat Science, Institute of Food Science and Biotechnology, University of Hohenheim, Garbenstraße 21/25, Stuttgart, 70599, Germany
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16
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Matsuo K, Kumashiro M, Gekko K. Characterization of the mechanism of interaction between α1‐acid glycoprotein and lipid membranes by vacuum‐ultraviolet circular‐dichroism spectroscopy. Chirality 2020; 32:594-604. [DOI: 10.1002/chir.23208] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2019] [Revised: 01/27/2020] [Accepted: 02/17/2020] [Indexed: 12/11/2022]
Affiliation(s)
- Koichi Matsuo
- Hiroshima Synchrotron Radiation CenterHiroshima University Higashi‐Hiroshima Japan
| | - Munehiro Kumashiro
- Department of Physical Science, Graduate School of ScienceHiroshima University Higashi‐Hiroshima Japan
| | - Kunihiko Gekko
- Hiroshima Synchrotron Radiation CenterHiroshima University Higashi‐Hiroshima Japan
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17
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Vasconcelos JM, Zen F, Angione MD, Cullen RJ, Santos-Martinez MJ, Colavita PE. Understanding the Carbon–Bio Interface: Influence of Surface Chemistry and Buffer Composition on the Adsorption of Phospholipid Liposomes at Carbon Surfaces. ACS APPLIED BIO MATERIALS 2020; 3:997-1007. [DOI: 10.1021/acsabm.9b01011] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
| | - Federico Zen
- School of Chemistry, Trinity College Dublin, Dublin 2, Ireland
| | | | - Ronan J. Cullen
- School of Chemistry, Trinity College Dublin, Dublin 2, Ireland
| | - Maria J. Santos-Martinez
- School of Pharmacy and Pharmaceutical Sciences, School of Medicine and Trinity Biomedical Sciences Institute, Trinity College Dublin, Dublin 2, Ireland
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18
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Rizzuti B, Bartucci R, Guzzi R. Effects of Polar Head Nature and Tail Length of Single-Chain Lipids on the Conformational Stability of β-Lactoglobulin. J Phys Chem B 2020; 124:944-952. [PMID: 31968169 DOI: 10.1021/acs.jpcb.9b09925] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Interaction between β-lactoglobulin and single-chain lipids, differing for either the length of the aliphatic chain or the molecular properties of the headgroup, was investigated at neutral and acidic pH to determine the impact on the thermal stability of the protein. Differential scanning calorimetry results with different fatty acids (from C10:0 to C18:0) show a correlation of both melting temperature and unfolding enthalpy of the protein with the ligand binding affinity, and the maximum effect was found for palmitic acid (PLM). The influence of the lipid polar head was investigated by comparing PLM with lyso-palmitoylphosphatidylcholine (LPC), which possesses the same aliphatic chain. At neutral pH, the stabilizing effect of LPC is less favorable compared to PLM. However, fluorescence results revealed that LPC can bind into the protein calyx even at acidic pH, at variance with fatty acids. Molecular dynamics simulations indicated that this difference is due to the ability of the polar head of LPC to interact with the protein loop that regulates the shift (Tanford transition) between open and closed state of the binding site of β-lactoglobulin. The results provide a rationale for how a ligand has the ability to access the protein active site at acidic conditions by overcoming the Tanford transition, and they demonstrate that β-lactoglobulin can deliver ligands with tailored properties of the polar head in a wide pH range.
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Affiliation(s)
- Bruno Rizzuti
- CNR-NANOTEC, Licryl-UOS Cosenza and CEMIF.Cal, Department of Physics , University of Calabria , 87036 Rende , Italy
| | - Rosa Bartucci
- Department of Chemistry and Chemical Technologies and Molecular Biophysics Laboratory , University of Calabria , 87036 Rende , Italy
| | - Rita Guzzi
- CNR-NANOTEC, Licryl-UOS Cosenza and CEMIF.Cal, Department of Physics , University of Calabria , 87036 Rende , Italy.,Department of Physics, Molecular Biophysics Laboratory , University of Calabria , 87036 Rende , Italy
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19
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Peppino Margutti M, Wilke N, Villasuso AL. Influence of Ca 2+ on the surface behavior of phosphatidic acid and its mixture with diacylglycerol pyrophosphate at different pHs. Chem Phys Lipids 2020; 228:104887. [PMID: 32027867 DOI: 10.1016/j.chemphyslip.2020.104887] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2019] [Revised: 12/13/2019] [Accepted: 01/30/2020] [Indexed: 01/13/2023]
Abstract
The signaling lipids phosphatidic acid (PA) and diacylglycerol pyrophosphate (DGPP) are involved in regulating the stress response in plants. PA and DGPP are anionic lipids consisting of a negatively charged phosphomonoester or pyrophosphate group attached to diacylglycerol, respectively. Changes in the pH modulate the protonation of their head groups modifying the interaction with other effectors. Here, we examine in a controlled system how the presence of Ca2+ modulates the surface organization of dioleyl diacylglycerol pyrophosphate (DGPP) and its interaction with dioleoyl phosphatidic acid (DOPA) at different pHs. Both lipids formed expanded monolayers at pH 5 and 8. At acid and basic pHs, monolayers formed by DOPA or DGPP became denser when Ca2+ was added to the subphase. At pH 5, Ca2+ also induced an increase of surface potential of both lipids. Conversely, at pH 8 the effects induced by the presence of Ca2+ on the surface potential were reversed. Mixed monolayers of DOPA and DGPP showed a non-ideal behavior. The addition of even tiny amounts of DGPP to DOPA films caused a reduction of the mean molecular area. This effect was more evident at pH 8 compared to pH 5. Our finding suggests that low amounts of DGPP in an film enriched in DOPA could lead to a local increase in film packing with a concomitant change in the local polarization, further regulated by local pH. This fact may have implications for the assigned role of PA as a pH-sensing phospholipid or during its interaction with proteins.
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Affiliation(s)
- Micaela Peppino Margutti
- Universidad Nacional de Río Cuarto, FCEFQyN, Departamento de Biología Molecular, Río Cuarto, Argentina
| | - Natalia Wilke
- Universidad Nacional de Córdoba, Facultad de Ciencias Químicas, Departamento de Química Biológica Ranwel Caputto, Córdoba, Argentina; CONICET, Universidad Nacional de Córdoba, Centro de Investigaciones en Química Biológica de Córdoba (CIQUIBIC), Córdoba, Argentina
| | - Ana Laura Villasuso
- Universidad Nacional de Río Cuarto, FCEFQyN, Departamento de Biología Molecular, Río Cuarto, Argentina; CONICET, Universidad Nacional de Río Cuarto, Instituto de Biotecnologia Ambiental y Salud, (INBIAS), Río Cuarto, Argentina.
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20
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Deplazes E, Sarrami F, Poger D. Effect of H3O+ on the Structure and Dynamics of Water at the Interface with Phospholipid Bilayers. J Phys Chem B 2020; 124:1361-1373. [DOI: 10.1021/acs.jpcb.9b10169] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Affiliation(s)
- Evelyne Deplazes
- School of Life Sciences, University of Technology Sydney, Ultimo, New South Wales 2007, Australia
- School of Pharmacy and Biomedical Sciences, Curtin Institute for Computation, Curtin University, Perth, Western Australia 6845, Australia
| | - Farzaneh Sarrami
- School of Chemistry and Biochemistry, The University of Western Australia, Perth, Western Australia 6009, Australia
| | - David Poger
- School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, Queensland 4072, Australia
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21
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Moles E, Kavallaris M, Fernàndez-Busquets X. Modeling the Distribution of Diprotic Basic Drugs in Liposomal Systems: Perspectives on Malaria Nanotherapy. Front Pharmacol 2019; 10:1064. [PMID: 31611785 PMCID: PMC6773836 DOI: 10.3389/fphar.2019.01064] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2019] [Accepted: 08/20/2019] [Indexed: 01/16/2023] Open
Abstract
Understanding how polyprotic compounds distribute within liposome (LP) suspensions is of major importance to design effective drug delivery strategies. Advances in this research field led to the definition of LP-based active drug encapsulation methods driven by transmembrane pH gradients with evidenced efficacy in the management of cancer and infectious diseases. An accurate modeling of membrane-solution drug partitioning is also fundamental when designing drug delivery systems for poorly endocytic cells, such as red blood cells (RBCs), in which the delivered payloads rely mostly on the passive diffusion of drug molecules across the cell membrane. Several experimental models have been proposed so far to predict the partitioning of polyprotic basic/acid drugs in artificial membranes. Nevertheless, the definition of a model in which the membrane-solution partitioning of each individual drug microspecies is studied relative to each other is still a topic of ongoing research. We present here a novel experimental approach based on mathematical modeling of drug encapsulation efficiency (EE) data in liposomal systems by which microspecies-specific partition coefficients are reported as a function of pH and phospholipid compositions replicating the RBC membrane in a simple and highly translatable manner. This approach has been applied to the study of several diprotic basic antimalarials of major clinical importance (quinine, primaquine, tafenoquine, quinacrine, and chloroquine) describing their respective microspecies distribution in phosphatidylcholine-LP suspensions. Estimated EE data according to the model described here closely fitted experimental values with no significant differences obtained in 75% of all pH/lipid composition-dependent conditions assayed. Additional applications studied include modeling drug EE in LPs in response to transmembrane pH gradients and lipid bilayer asymmetric charge, conditions of potential interest reflected in our previously reported RBC-targeted antimalarial nanotherapeutics.
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Affiliation(s)
- Ernest Moles
- Children's Cancer Institute, Lowy Cancer Research Centre, UNSW Sydney, Randwick, NSW, Australia.,School of Women's and Children's Health, UNSW Sydney, Sydney, NSW, Australia.,ARC Centre of Excellence in Convergent Bio-Nano Science and Technology, Australian Centre for NanoMedicine, UNSW Sydney, Sydney, NSW, Australia
| | - Maria Kavallaris
- Children's Cancer Institute, Lowy Cancer Research Centre, UNSW Sydney, Randwick, NSW, Australia.,School of Women's and Children's Health, UNSW Sydney, Sydney, NSW, Australia.,ARC Centre of Excellence in Convergent Bio-Nano Science and Technology, Australian Centre for NanoMedicine, UNSW Sydney, Sydney, NSW, Australia
| | - Xavier Fernàndez-Busquets
- Nanomalaria Group, Institute for Bioengineering of Catalonia (IBEC), The Barcelona Institute of Science and Technology, Barcelona, Spain.,Barcelona Institute for Global Health (ISGlobal, Hospital Clínic-Universitat de Barcelona), Barcelona, Spain.,Nanoscience and Nanotechnology Institute (IN2UB), University of Barcelona, Barcelona, Spain
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22
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Yue Z, Li C, Voth GA, Swanson JMJ. Dynamic Protonation Dramatically Affects the Membrane Permeability of Drug-like Molecules. J Am Chem Soc 2019; 141:13421-13433. [PMID: 31382734 DOI: 10.1021/jacs.9b04387] [Citation(s) in RCA: 44] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Permeability (Pm) across biological membranes is of fundamental importance and a key factor in drug absorption, distribution, and development. Although the majority of drugs will be charged at some point during oral delivery, our understanding of membrane permeation by charged species is limited. The canonical model assumes that only neutral molecules partition into and passively permeate across membranes, but there is mounting evidence that these processes are also facile for certain charged species. However, it is unknown whether such ionizable permeants dynamically neutralize at the membrane surface or permeate in their charged form. To probe protonation-coupled permeation in atomic detail, we herein apply continuous constant-pH molecular dynamics along with free energy sampling to study the permeation of a weak base propranolol (PPL), and evaluate the impact of including dynamic protonation on Pm. The simulations reveal that PPL dynamically neutralizes at the lipid-tail interface, which dramatically influences the permeation free energy landscape and explains why the conventional model overestimates the assigned intrinsic permeability. We demonstrate how fixed-charge-state simulations can account for this effect, and propose a revised model that better describes pH-coupled partitioning and permeation. Our results demonstrate how dynamic changes in protonation state may play a critical role in the permeation of ionizable molecules, including pharmaceuticals and drug-like molecules, thus requiring a revision of the standard picture.
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Affiliation(s)
- Zhi Yue
- Department of Chemistry, James Frank Institute, and Institute for Biophysical Dynamics , The University of Chicago , Chicago , Illinois 60637 , United States
| | - Chenghan Li
- Department of Chemistry, James Frank Institute, and Institute for Biophysical Dynamics , The University of Chicago , Chicago , Illinois 60637 , United States
| | - Gregory A Voth
- Department of Chemistry, James Frank Institute, and Institute for Biophysical Dynamics , The University of Chicago , Chicago , Illinois 60637 , United States
| | - Jessica M J Swanson
- Department of Chemistry, James Frank Institute, and Institute for Biophysical Dynamics , The University of Chicago , Chicago , Illinois 60637 , United States
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23
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Mercurio FA, Scaloni A, Caira S, Leone M. The antimicrobial peptides casocidins I and II: Solution structural studies in water and different membrane-mimetic environments. Peptides 2019; 114:50-58. [PMID: 30243923 DOI: 10.1016/j.peptides.2018.09.004] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/08/2018] [Revised: 09/18/2018] [Accepted: 09/18/2018] [Indexed: 10/28/2022]
Abstract
Antimicrobial peptides (AMPs) represent crucial components of the natural immune defense machinery of different organisms. Generally, they are short and positively charged, and bind to and destabilize bacterial cytoplasmic membranes, ultimately leading to cell death. Natural proteolytic cleavage of αs2-casein in bovine milk generates the antimicrobial peptides casocidin I and II. In the current study, we report for the first time on a detailed structure characterization of casocidins in solution by means of Nuclear Magnetic Resonance spectroscopy (NMR). Structural studies were conducted in H2O and different membrane mimetic environments, including 2,2,2-trifluoroethanol (TFE) and lipid anionic and zwitterionic vesicles. For both peptides, results indicate a mainly disordered conformation in H2O, with a few residues in a partial helical structure. No wide increase of order occurs upon interaction with lipid vesicles. Conversely, peptide conformation becomes highly ordered in presence of TFE, with both casocidins presenting a large helical content. Our data point out a preference of casocidins to interact with model anionic membranes. These results are compatible with possible mechanisms of action underlying the antimicrobial activity of casocidins that ultimately may affect membrane bilayer stability.
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Affiliation(s)
- Flavia Anna Mercurio
- Institute of Biostructures and Bioimaging (IBB), National Research Council & Interuniversity Research Centre on Bioactive Peptides (CIRPEB), Via Mezzocannone 16, 80134 Naples, Italy
| | - Andrea Scaloni
- Proteomics & Mass Spectrometry Laboratory, ISPAAM, National Research Council, Via Argine 1085, 80147 Naples, Italy
| | - Simonetta Caira
- Proteomics & Mass Spectrometry Laboratory, ISPAAM, National Research Council, Via Argine 1085, 80147 Naples, Italy
| | - Marilisa Leone
- Institute of Biostructures and Bioimaging (IBB), National Research Council & Interuniversity Research Centre on Bioactive Peptides (CIRPEB), Via Mezzocannone 16, 80134 Naples, Italy.
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24
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Engel KM, Sampels S, Dzyuba B, Podhorec P, Policar T, Dannenberger D, Schiller J. Swimming at different temperatures: The lipid composition of sperm from three freshwater fish species determined by mass spectrometry and nuclear magnetic resonance spectroscopy. Chem Phys Lipids 2019; 221:65-72. [PMID: 30922837 DOI: 10.1016/j.chemphyslip.2019.03.014] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2019] [Revised: 03/22/2019] [Accepted: 03/25/2019] [Indexed: 12/11/2022]
Abstract
The spawning behavior of different fish species is as diverse as their habitats. A lot of factors influence the (phospho)lipid composition of fish sperm, including the water temperature at which spawning takes place. Therefore, this study aimed on the elucidation of the phospholipid composition of sperm from three fish species from different orders (common carp - Cyprinus carpio, northern pike - Esox lucius and burbot - Lota lota) with different spawning temperatures by nuclear magnetic resonance spectroscopy (NMR), matrix-assisted laser desorption/ionization mass spectrometry and thin-layer chromatography (TLC) coupled to electrospray ionization mass spectrometry as well as gas chromatography. Next to the lipid composition that was different for carp, northern pike and burbot, regarding the moieties of the different (phospho)lipid classes (particularly sphingomyelin and acidic phospholipids) and the saturation degree of the fatty acyl residues, there were differences observed depending on the analytical method that was used. The results from TLC and NMR investigations differed regarding the amounts of the different phospholipids. Reasons for these discrepancies are discussed in detail.
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Affiliation(s)
- Kathrin M Engel
- Institute for Medical Physics and Biophysics, Medical Faculty, University of Leipzig, Härtelstr. 16-18, 04107 Leipzig, Germany.
| | - Sabine Sampels
- Department of Molecular Sciences, Swedish University of Agricultural Sciences, PO Box 7015, 75007 Uppsala, Sweden
| | - Borys Dzyuba
- Faculty of Fisheries and Protection of Waters, University of South Bohemia, South Bohemian Research Centre for Aquaculture and Biodiversity of Hydrocenoses, Zátiší 728/II, 389 25 Vodňany, Czech Republic
| | - Peter Podhorec
- Faculty of Fisheries and Protection of Waters, University of South Bohemia, South Bohemian Research Centre for Aquaculture and Biodiversity of Hydrocenoses, Zátiší 728/II, 389 25 Vodňany, Czech Republic
| | - Tomáš Policar
- Faculty of Fisheries and Protection of Waters, University of South Bohemia, South Bohemian Research Centre for Aquaculture and Biodiversity of Hydrocenoses, Zátiší 728/II, 389 25 Vodňany, Czech Republic
| | - Dirk Dannenberger
- Leibniz Institute for Farm Animal Biology, Institute of Muscle Biology and Growth, Lipid Metabolism and Muscular Adaptation Workgroup, Wilhelm-Stahl-Allee 2, 18196 Dummerstorf, Germany
| | - Jürgen Schiller
- Institute for Medical Physics and Biophysics, Medical Faculty, University of Leipzig, Härtelstr. 16-18, 04107 Leipzig, Germany
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25
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Alnajeebi AM, Vickerman JC, Lockyer NP. The influence of polyatomic primary ion chemistry on matrix effects in secondary ion mass spectrometry analysis. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2018; 32:1962-1970. [PMID: 30133034 DOI: 10.1002/rcm.8265] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/19/2018] [Revised: 08/01/2018] [Accepted: 08/10/2018] [Indexed: 06/08/2023]
Abstract
RATIONALE The application of mass spectrometry imaging techniques to determine two- (2D) and three- (3D) dimensional chemical distribution ideally provides uniform, high sensitivity to multiple components and reliable quantification. These criteria are typically not met due to variations in sensitivity due to the chemistry of the analyte and surrounding surface chemistry. Here we explore the influence of projectile beam chemistry and sample chemistry in time-of-flight secondary ion mass spectrometry (TOF-SIMS). To the authors' knowledge this is the first time the combined effects of projectile chemistry and sample environment on the quantitative determination of mixed samples have been systematically studied. METHODS Secondary ion yields of lipid and amino acid mixtures were measured under 20 keV C60 , Arn , and (H2 O)n cluster ion bombardment (n = 2000 or 4000) using TOF-SIMS. Ion suppression/enhancement effects were studied in dry sample films and in trehalose and water ice matrices. RESULTS The extent of the matrix effects and the secondary ion yield were found to depend on the chemistry of the primary ion beam and (for C60 , Arn ) on the nature of the sample matrix. Under (H2 O)n bombardment the sample matrix had negligible effect on the analysis. CONCLUSIONS Compared with C60 and Arn , water-containing cluster projectiles enhanced the sensitivity of TOF-SIMS determination of the chosen analytes and reduced the effect of signal suppression/enhancement in multicomponent samples and in different sample matrices. One possible explanation for this is that the (H2 O)4000 projectile initiates on impact a nanoscale matrix environment that is very similar to that in frozen-hydrated samples in terms of the resulting ionisation effects. The competition between analytes for protons and the effect of the sample matrix are reduced with water-containing cluster projectiles. These chemically reactive projectile beams have improved characteristics for quantitative chemical imaging by TOF-SIMS compared with their non-reactive counterparts.
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Affiliation(s)
- Afnan M Alnajeebi
- Manchester Institute of Biotechnology, The University of Manchester, 131 Princess St, Manchester, M1 7DN, UK
- School of Chemistry, The University of Manchester, Oxford Rd, Manchester, M13 9PL, UK
| | - John C Vickerman
- Manchester Institute of Biotechnology, The University of Manchester, 131 Princess St, Manchester, M1 7DN, UK
- School of Chemical Engineering and Analytical Science, The University of Manchester, Oxford Rd, Manchester, M13 9PL, UK
| | - Nicholas P Lockyer
- Manchester Institute of Biotechnology, The University of Manchester, 131 Princess St, Manchester, M1 7DN, UK
- School of Chemistry, The University of Manchester, Oxford Rd, Manchester, M13 9PL, UK
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26
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Ehrl B, Mogusu EO, Kim K, Hofstetter H, Pedersen JA, Elsner M. High Permeation Rates in Liposome Systems Explain Rapid Glyphosate Biodegradation Associated with Strong Isotope Fractionation. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2018; 52:7259-7268. [PMID: 29790342 PMCID: PMC7193547 DOI: 10.1021/acs.est.8b01004] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/21/2018] [Revised: 05/17/2018] [Accepted: 05/23/2018] [Indexed: 05/22/2023]
Abstract
Bacterial uptake of charged organic pollutants such as the widely used herbicide glyphosate is typically attributed to active transporters, whereas passive membrane permeation as an uptake pathway is usually neglected. For 1-palmitoyl-2-oleoyl- sn-glycero-3-phosphocholine (POPC) liposomes, the pH-dependent apparent membrane permeation coefficients ( Papp) of glyphosate, determined by nuclear magnetic resonance (NMR) spectroscopy, varied from Papp (pH 7.0) = 3.7 (±0.3) × 10-7 m·s-1 to Papp (pH 4.1) = 4.2 (±0.1) × 10-6 m·s-1. The magnitude of this surprisingly rapid membrane permeation depended on glyphosate speciation and was, at circumneutral pH, in the range of polar, noncharged molecules. These findings point to passive membrane permeation as a potential uptake pathway during glyphosate biodegradation. To test this hypothesis, a Gram-negative glyphosate degrader, Ochrobactrum sp. FrEM, was isolated from glyphosate-treated soil and glyphosate permeation rates inferred from the liposome model system were compared to bacterial degradation rates. Estimated maximum permeation rates were, indeed, 2 orders of magnitude higher than degradation rates of glyphosate. In addition, biodegradation of millimolar glyphosate concentrations gave rise to pronounced carbon isotope fractionation with an apparent kinetic isotope effect, AKIEcarbon, of 1.014 ± 0.003. This value lies in the range typical of non-masked enzymatic isotope fractionation demonstrating that glyphosate biodegradation was not subject to mass transfer limitations and glyphosate exchange across the cell membrane was rapid relative to enzymatic turnover.
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Affiliation(s)
- Benno
N. Ehrl
- Institute
of Groundwater Ecology, Helmholtz Zentrum
München, Ingolstädter
Landstrasse 1, 85764 Neuherberg, Germany
| | - Emmanuel O. Mogusu
- Institute
of Groundwater Ecology, Helmholtz Zentrum
München, Ingolstädter
Landstrasse 1, 85764 Neuherberg, Germany
- Department
of Chemistry, Mwenge Catholic University, P.O. Box 1226, Moshi, Tanzania
| | - Kyoungtea Kim
- Molecular
and Environmental Toxicology Center, University
of Wisconsin, Madison, Wisconsin 53706, United States
| | - Heike Hofstetter
- Department
of Chemistry, University of Wisconsin, Madison, Wisconsin 53706, United States
| | - Joel A. Pedersen
- Molecular
and Environmental Toxicology Center, University
of Wisconsin, Madison, Wisconsin 53706, United States
- Department
of Chemistry, University of Wisconsin, Madison, Wisconsin 53706, United States
- Departments
of Soil Science and Civil & Environmental Chemistry, University of Wisconsin, Madison, Wisconsin 53706, United States
| | - Martin Elsner
- Institute
of Groundwater Ecology, Helmholtz Zentrum
München, Ingolstädter
Landstrasse 1, 85764 Neuherberg, Germany
- Institute
of Hydrochemistry, Chair for Analytical Chemistry and Water Chemistry, Technical University of Munich, Marchioninistrasse 17, 81377 Munich, Germany
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Lütgebaucks C, Macias-Romero C, Roke S. Characterization of the interface of binary mixed DOPC:DOPS liposomes in water: The impact of charge condensation. J Chem Phys 2018; 146:044701. [PMID: 28147550 DOI: 10.1063/1.4974084] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Solutions of liposomes composed of binary mixtures of anionic dioleoylphosphatidylserine (DOPS) and zwitterionic dioleoylphosphatidylcholine (DOPC) are investigated with label-free angle-resolved (AR) second harmonic scattering (SHS) and electrophoretic mobility measurements. The membrane surface potential is extracted from the AR-SHS response. The surface potential changes from -10 to -145 mV with varying DOPS content ( from 0% to 100%) and levels off already at ∼ 10 % DOPS content. The ζ-potential shows the same trend but with a drastically lower saturation value (-44 mV). This difference is explained by the formation of a condensed layer of Na+ counterions around the outer leaflet of the liposome as predicted by charge condensation theories for polyelectrolyte systems.
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Affiliation(s)
- Cornelis Lütgebaucks
- Laboratory for fundamental BioPhotonics (LBP), Institute of Bioengineering (IBI), and Institute of Materials Science (IMX), School of Engineering (STI), and Lausanne Centre for Ultrafast Science (LACUS), École Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
| | - Carlos Macias-Romero
- Laboratory for fundamental BioPhotonics (LBP), Institute of Bioengineering (IBI), and Institute of Materials Science (IMX), School of Engineering (STI), and Lausanne Centre for Ultrafast Science (LACUS), École Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
| | - Sylvie Roke
- Laboratory for fundamental BioPhotonics (LBP), Institute of Bioengineering (IBI), and Institute of Materials Science (IMX), School of Engineering (STI), and Lausanne Centre for Ultrafast Science (LACUS), École Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
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28
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Synergistic effect of PLGA nanoparticles and submicron triglyceride droplets in enhancing the intestinal solubilisation of a lipophilic weak base. Eur J Pharm Sci 2018; 118:40-48. [DOI: 10.1016/j.ejps.2018.03.018] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2018] [Revised: 02/23/2018] [Accepted: 03/16/2018] [Indexed: 12/13/2022]
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29
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Becucci L, Aloisi G, Scaloni A, Guidelli R. Channel-forming activity of lactophoricins I and II in mercury-supported tethered bilayer lipid membranes. J Electroanal Chem (Lausanne) 2018. [DOI: 10.1016/j.jelechem.2017.08.030] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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30
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Becucci L, Aloisi G, Scaloni A, Caira S, Guidelli R. On the interaction of the highly charged peptides casocidins with biomimetic membranes. Bioelectrochemistry 2018; 123:1-8. [PMID: 29715585 DOI: 10.1016/j.bioelechem.2018.04.012] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2018] [Revised: 04/12/2018] [Accepted: 04/17/2018] [Indexed: 11/16/2022]
Abstract
Casocidin I and II (CI and CII) are structurally related antimicrobial peptides made of 39 and 31 amino acids, respectively, which derive from natural proteolytic processing of αs2-casein and adopt an ordered α-helical structure in biomimetic membranes. Their putative membrane-permeabilizing activity was investigated at Hg-supported self-assembled monolayers (SAMs) and at tethered bilayer lipid membranes (tBLMs); the latter consisted of a monolayer of 2,3,di-O-phytanyl-sn-glycerol-1-tetraethylene-glycol-d,l-α lipoic acid ester thiolipid (DPTL), with a dioleoylphosphatidylcholine (DOPC) or dioleoylphosphatidylserine (DOPS) monolayer on top of it. Interaction of CI and CII with these biomimetic membranes was studied by four electrochemical techniques at pH 3, 5.4 and 6.8. Peptide incorporation in tBLMs was attempted via scans of electrochemical impedance spectra. Experiments demonstrated that CI and CII penetrate SAMs as well as the distal DOPC monolayer of DPTL/DOPC tBLMs, but not the proximal phytanyl monolayer, with the only exception of CII at pH 5.4. Conversely, CII permeabilized DPTL/DOPS tBLMs to a moderate extent at all investigated pH values by forming holes across the membrane, but not ion channels. Structural distribution of charged residues seemed to prevent CII from having a hydrophobic side of the α-helix capable of stabilizing a regular ion channel in the lipid matrix.
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Affiliation(s)
- Lucia Becucci
- Department of Chemistry, Florence University, via della Lastruccia 3, 50019 Sesto Fiorentino, Firenze, Italy; 1st Grade Secondary School "Giuseppe Pescetti", Via Gramsci 390, 50019 Sesto Fiorentino, Firenze, Italy.
| | - Giovanni Aloisi
- Department of Chemistry, Florence University, via della Lastruccia 3, 50019 Sesto Fiorentino, Firenze, Italy
| | - Andrea Scaloni
- Proteomics & Mass Spectrometry Laboratory, ISPAAM-National Research Council, 80147 Naples, Italy
| | - Simonetta Caira
- Proteomics & Mass Spectrometry Laboratory, ISPAAM-National Research Council, 80147 Naples, Italy
| | - Rolando Guidelli
- Department of Chemistry, Florence University, via della Lastruccia 3, 50019 Sesto Fiorentino, Firenze, Italy
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Mano CM, Guaratini T, Cardozo KHM, Colepicolo P, Bechara EJH, Barros MP. Astaxanthin Restrains Nitrative-Oxidative Peroxidation in Mitochondrial-Mimetic Liposomes: A Pre-Apoptosis Model. Mar Drugs 2018; 16:md16040126. [PMID: 29649159 PMCID: PMC5923413 DOI: 10.3390/md16040126] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2018] [Revised: 03/19/2018] [Accepted: 04/04/2018] [Indexed: 01/14/2023] Open
Abstract
Astaxanthin (ASTA) is a ketocarotenoid found in many marine organisms and that affords many benefits to human health. ASTA is particularly effective against radical-mediated lipid peroxidation, and recent findings hypothesize a “mitochondrial-targeted” action of ASTA in cells. Therefore, we examined the protective effects of ASTA against lipid peroxidation in zwitterionic phosphatidylcholine liposomes (PCLs) and anionic phosphatidylcholine: phosphatidylglycerol liposomes (PCPGLs), at different pHs (6.2 to 8.0), which were challenged by oxidizing/nitrating conditions that mimic the regular and preapoptotic redox environment of active mitochondria. Pre-apoptotic conditions were created by oxidized/nitr(osyl)ated cytochrome c and resulted in the highest levels of lipoperoxidation in both PCL and PCPGLs (pH 7.4). ASTA was less protective at acidic conditions, especially in anionic PCPGLs. Our data demonstrated the ability of ASTA to hamper oxidative and nitrative events that lead to cytochrome c-peroxidase apoptosis and lipid peroxidation, although its efficiency changes with pH and lipid composition of membranes.
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Affiliation(s)
- Camila M Mano
- Departamento de Bioquímica, Instituto de Química, Universidade de São Paulo (IQUSP), 05508-000 São Paulo, SP, Brazil.
- Instituto de Ciências da Atividade Física e do Esporte (ICAFE), Universidade Cruzeiro do Sul, 01506-000 São Paulo, SP, Brazil.
- Superintendência da Polícia Técnico Científica, 05507-060 São Paulo, SP, Brazil.
| | - Thais Guaratini
- Departamento de Bioquímica, Instituto de Química, Universidade de São Paulo (IQUSP), 05508-000 São Paulo, SP, Brazil.
- Lychnoflora Pesquisa e Desenvolvimento em Produtos Naturais LTDA, 14030-090 Ribeirão Preto, SP, Brazil.
| | - Karina H M Cardozo
- Departamento de Bioquímica, Instituto de Química, Universidade de São Paulo (IQUSP), 05508-000 São Paulo, SP, Brazil.
- Grupo Fleury, 04344-070 São Paulo, SP, Brazil.
| | - Pio Colepicolo
- Departamento de Bioquímica, Instituto de Química, Universidade de São Paulo (IQUSP), 05508-000 São Paulo, SP, Brazil.
| | - Etelvino J H Bechara
- Departamento de Ciências Exatas e da Terra, Universidade Federal de São Paulo, Diadema, UNIFESP, 09972-270 Diadema, SP, Brazil.
- Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo (IQUSP), 05508-000 São Paulo, SP, Brazil.
| | - Marcelo P Barros
- Instituto de Ciências da Atividade Física e do Esporte (ICAFE), Universidade Cruzeiro do Sul, 01506-000 São Paulo, SP, Brazil.
- Instituto de Agroquímica y Tecnología de Alimentos (IATA-CSIC), Departamento de Ciencia de los Alimentos, Calle Catedrático Agustín Escardino 7, 46980 Paterna, Spain.
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32
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Electrochemical behaviour of uncoated and phosphatidylcholine coated copper in hydrochloric acid medium. J Mol Liq 2018. [DOI: 10.1016/j.molliq.2017.11.129] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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33
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Deplazes E, Poger D, Cornell B, Cranfield CG. The effect of hydronium ions on the structure of phospholipid membranes. Phys Chem Chem Phys 2018; 20:357-366. [DOI: 10.1039/c7cp06776c] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
This work studies the mechanisms by which hydronium ions modulate the structure of phospholipid bilayers.
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Affiliation(s)
- Evelyne Deplazes
- School of Biomedical Sciences
- Curtin Health Innovation Research Institute and Curtin Institute for Computation
- Curtin University
- Perth
- Australia
| | - David Poger
- School of Chemistry and Molecular Biosciences
- The University of Queensland
- Brisbane
- Australia
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34
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Sugikawa K, Takamatsu Y, Kakigi T, Yasuhara K, Ikeda A. Tubulation of liposomes via the interaction of supramolecular nanofibers. Chem Commun (Camb) 2017; 53:10140-10143. [PMID: 28848982 DOI: 10.1039/c7cc05857h] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We achieved tubulation of self-assembled lipid membranes, liposomes, via the interaction of supramolecular nanofibers, porphyrin J-aggregates. This structural change was reversible, and the deformation of the porphyrin J-aggregates caused reconstruction of the liposomes from the tubes. We discussed the tubulation mechanism and calculated the force provided by porphyrin J-aggregates for tubulation.
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Affiliation(s)
- Kouta Sugikawa
- Graduate School of Engineering, Hiroshima University, Higashi-Hiroshima 739-8527, Japan.
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35
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Navon Y, Radavidson H, Putaux JL, Jean B, Heux L. pH-Sensitive Interactions between Cellulose Nanocrystals and DOPC Liposomes. Biomacromolecules 2017; 18:2918-2927. [DOI: 10.1021/acs.biomac.7b00872] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Yotam Navon
- Univ. Grenoble Alpes, Centre de Recherches sur les Macromolécules
Végétales (CERMAV), F-38000 Grenoble, France
- CNRS, CERMAV, F-38000 Grenoble, France
| | - Harisoa Radavidson
- Univ. Grenoble Alpes, Centre de Recherches sur les Macromolécules
Végétales (CERMAV), F-38000 Grenoble, France
- CNRS, CERMAV, F-38000 Grenoble, France
| | - Jean-Luc Putaux
- Univ. Grenoble Alpes, Centre de Recherches sur les Macromolécules
Végétales (CERMAV), F-38000 Grenoble, France
- CNRS, CERMAV, F-38000 Grenoble, France
| | - Bruno Jean
- Univ. Grenoble Alpes, Centre de Recherches sur les Macromolécules
Végétales (CERMAV), F-38000 Grenoble, France
- CNRS, CERMAV, F-38000 Grenoble, France
| | - Laurent Heux
- Univ. Grenoble Alpes, Centre de Recherches sur les Macromolécules
Végétales (CERMAV), F-38000 Grenoble, France
- CNRS, CERMAV, F-38000 Grenoble, France
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36
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Okamoto H, Hamaguchi R, Kuroda Y. Hydrophilic interaction chromatography with a focus on the drug–phosphate interaction in drug screening to determine the phospholipidosis induction risk. J Chromatogr B Analyt Technol Biomed Life Sci 2017; 1051:33-40. [DOI: 10.1016/j.jchromb.2017.02.024] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2016] [Revised: 02/20/2017] [Accepted: 02/22/2017] [Indexed: 11/26/2022]
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37
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Sugikawa K, Takamatsu Y, Yasuhara K, Ueda M, Ikeda A. Reversible Vesicle-to-Disk Transitions of Liposomes Induced by the Self-Assembly of Water-Soluble Porphyrins. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:1023-1029. [PMID: 28054781 DOI: 10.1021/acs.langmuir.6b02723] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Structural control of lipid membranes is important for mechanisms underlying biological functions and for creating high-functionality soft materials. We demonstrate the reversible control of vesicle structures (liposomes) using supramolecular assemblies. Specifically, water-soluble anionic porphyrin molecules interact with positively charged lipid membrane surfaces to form one-dimensional self-assembled structures (J-aggregates) under acidic conditions. Cryogenic transmission electron microscopy revealed that porphyrin J-aggregates on the membrane surface induced an extensive structural change from vesicles to layered disks. Neutralization of the solution deformed the porphyrin J-aggregates, thereby reforming nanosized liposomes from the layered disks.
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Affiliation(s)
- Kouta Sugikawa
- Department of Applied Chemistry, Graduate School of Engineering, Hiroshima University , Higashi-Hiroshima 739-8527, Japan
| | - Yutaro Takamatsu
- Department of Applied Chemistry, Graduate School of Engineering, Hiroshima University , Higashi-Hiroshima 739-8527, Japan
| | - Kazuma Yasuhara
- Graduate School of Materials Science, Nara Institute of Science and Technology , Nara 630-0192, Japan
| | - Masafumi Ueda
- Department of Applied Chemistry, Graduate School of Engineering, Hiroshima University , Higashi-Hiroshima 739-8527, Japan
| | - Atsushi Ikeda
- Department of Applied Chemistry, Graduate School of Engineering, Hiroshima University , Higashi-Hiroshima 739-8527, Japan
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Becucci L, Guidelli R. What Ion Flow along Ion Channels Can Tell us about Their Functional Activity. MEMBRANES 2016; 6:membranes6040053. [PMID: 27983579 PMCID: PMC5192409 DOI: 10.3390/membranes6040053] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/29/2016] [Revised: 11/25/2016] [Accepted: 12/01/2016] [Indexed: 11/16/2022]
Abstract
The functional activity of channel-forming peptides and proteins is most directly verified by monitoring the flow of physiologically relevant inorganic ions, such as Na⁺, K⁺ and Cl-, along the ion channels. Electrical current measurements across bilayer lipid membranes (BLMs) interposed between two aqueous solutions have been widely employed to this end and are still extensively used. However, a major drawback of BLMs is their fragility, high sensitivity toward vibrations and mechanical shocks, and low resistance to electric fields. To overcome this problem, metal-supported tethered BLMs (tBLMs) have been devised, where the BLM is anchored to the metal via a hydrophilic spacer that replaces and mimics the water phase on the metal side. However, only mercury-supported tBLMs can measure and regulate the flow of the above inorganic ions, thanks to mercury liquid state and high hydrogen overpotential. This review summarizes the main results achieved by BLMs incorporating voltage-gated channel-forming peptides, interpreting them on the basis of a kinetic mechanism of nucleation and growth. Hg-supported tBLMs are then described, and their potential for the investigation of voltage-gated and ohmic channels is illustrated by the use of different electrochemical techniques.
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Affiliation(s)
- Lucia Becucci
- Department of Chemistry "Ugo Schiff", University of Florence, Via della Lastruccia, 3, Sesto Fiorentino 50019, Italy.
| | - Rolando Guidelli
- Department of Chemistry "Ugo Schiff", University of Florence, Via della Lastruccia, 3, Sesto Fiorentino 50019, Italy.
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39
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Becucci L, Aloisi G, Guidelli R. When and how the melittin ion channel exhibits ohmic behavior. Bioelectrochemistry 2016; 113:51-59. [PMID: 27732908 DOI: 10.1016/j.bioelechem.2016.10.001] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2016] [Revised: 10/03/2016] [Accepted: 10/04/2016] [Indexed: 11/15/2022]
Abstract
Melittin exhibits an ohmic behavior in a lipid bilayer having a DOPC distal leaflet and interposed between a 2.25nm tetraethyleneoxy chain tethered to a mercury drop and an aqueous solution. This behavior is induced in a pH6.8 buffer solution of 0.8μg/mL melittin by a pretreatment consisting of series of electrochemical impedance spectroscopy measurements at bias potentials varied by 50mV steps over a transmembrane potential range from about +250 to -250mV. This metastable ohmic behavior remains unchanged for hours, even after acidifying the solution to pH3. The midpoint potential E1/2 between the positive and negative peaks of the resulting cyclic voltammogram is almost coincident with that of the ohmic channels gramicidin and syringopeptin 25A and shifts by the same amount toward more positive potentials with a pH decrease from 6.8 to 3. This common cyclic voltammetry behavior is explained by a tilt of the DOPC polar heads around the channel mouth of these three peptides and is simulated by a modelistic approach. The ohmic behavior of melittin is explained by the persistence of the peptide orientation initially assumed at trans-negative potentials even after application of trans-positive ones, at sufficiently high peptide-to-lipid molar ratios.
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Affiliation(s)
- Lucia Becucci
- Department of Chemistry "Ugo Schiff", Florence University, Via della Lastruccia 3, 50019 Sesto Fiorentino, Firenze, Italy.
| | - Giovanni Aloisi
- Department of Chemistry "Ugo Schiff", Florence University, Via della Lastruccia 3, 50019 Sesto Fiorentino, Firenze, Italy
| | - Rolando Guidelli
- Department of Chemistry "Ugo Schiff", Florence University, Via della Lastruccia 3, 50019 Sesto Fiorentino, Firenze, Italy.
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40
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Becucci L, Toppi A, Fiore A, Scaloni A, Guidelli R. Channel-forming activity of syringopeptin 25A in mercury-supported phospholipid monolayers and negatively charged bilayers. Bioelectrochemistry 2016; 111:131-42. [DOI: 10.1016/j.bioelechem.2016.06.004] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2016] [Revised: 06/10/2016] [Accepted: 06/12/2016] [Indexed: 11/15/2022]
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41
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Martfeld AN, Greathouse DV, Koeppe RE. Ionization Properties of Histidine Residues in the Lipid Bilayer Membrane Environment. J Biol Chem 2016; 291:19146-56. [PMID: 27440045 PMCID: PMC5009283 DOI: 10.1074/jbc.m116.738583] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2016] [Revised: 07/12/2016] [Indexed: 01/22/2023] Open
Abstract
We address the critically important ionization properties of histidine side chains of membrane proteins, when exposed directly to lipid acyl chains within lipid bilayer membranes. The problem is important for addressing general principles that may underlie membrane protein function. To this end, we have employed a favorable host peptide framework provided by GWALP23 (acetyl-GGALW(5)LALALALALALALW(19)LAGA-amide). We inserted His residues into position 12 or 14 of GWALP23 (replacing either Leu(12) or Leu(14)) and incorporated specific [(2)H]Ala labels within the helical core sequence. Solid-state (2)H NMR spectra report the folding and orientation of the core sequence, revealing marked differences in the histidine-containing transmembrane helix behavior between acidic and neutral pH conditions. At neutral pH, the GWALP23-H12 and GWALP23-H14 helices exhibit well defined tilted transmembrane orientations in dioleoylphosphatidylcholine (DOPC)and dilauroylphosphatidylcholine (DLPC) bilayer membranes. Under acidic conditions, when His(12) is protonated and charged, the GWALP23-H12 helix exhibits a major population that moves to the DOPC bilayer surface and a minor population that occupies multiple transmembrane states. The response to protonation of His(14) is an increase in helix tilt, but GWALP23-H14 remains in a transmembrane orientation. The results suggest pKa values of less than 3 for His(12) and about 3-5 for His(14) in DOPC membranes. In the thinner DLPC bilayers, with increased water access, the helices are less responsive to changes in pH. The combined results enable us to compare the ionization properties of lipid-exposed His, Lys, and Arg side chains in lipid bilayer membranes.
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Affiliation(s)
- Ashley N Martfeld
- From the Department of Chemistry and Biochemistry, University of Arkansas, Fayetteville, Arkansas 72701
| | - Denise V Greathouse
- From the Department of Chemistry and Biochemistry, University of Arkansas, Fayetteville, Arkansas 72701
| | - Roger E Koeppe
- From the Department of Chemistry and Biochemistry, University of Arkansas, Fayetteville, Arkansas 72701
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42
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Becucci L, Rossi M, Fiore A, Scaloni A, Guidelli R. Channel-forming activity of syringopeptin 25A in mercury-supported lipid bilayers with a phosphatidylcholine distal leaflet. Bioelectrochemistry 2016; 108:28-35. [DOI: 10.1016/j.bioelechem.2015.12.002] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2015] [Revised: 10/09/2015] [Accepted: 12/01/2015] [Indexed: 10/22/2022]
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43
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Levine ZA, DeNardis NI, Vernier PT. Phospholipid and Hydrocarbon Interactions with a Charged Electrode Interface. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:2808-2819. [PMID: 26927605 DOI: 10.1021/acs.langmuir.5b04090] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Using a combination of molecular dynamics simulations and experiments we examined the interactions of alkanes and phospholipids at charged interfaces in order to understand how interfacial charge densities affect the association of these two representative molecules with electrodes. Consistent with theory and experiment, these model systems reveal interfacial associations mediated through a combination of Coulombic and van der Waals forces. van der Waals forces, in particular, mediate rapid binding of decane to neutral electrodes. No decane binding was observed at high surface charge densities because of interfacial water polarization, which screens hydrophobic attractions. The positively charged choline moiety of the phospholipid palmitoyloleoylphosphatidylcholine (POPC) is primarily responsible for POPC attraction by a moderately negatively charged electrode. The hydrocarbon tails of POPC interact with the hydrophobic electrode interface similarly to decane. Previously reported electrochemical results confirm these findings by demonstrating bipolar displacement currents from PC vesicles adhering to moderately negatively charged interfaces, originating from the choline interactions observed in simulations. At more negatively charged interfaces, choline-to-surface binding was stronger. In both simulations and experiments the maximal interaction of anionic PS occurs with a positively charged interface, provided that the electrostatic forces outweigh local Lennard-Jones interactions. Direct comparisons between the binding affinities measured in experiments and those obtained in simulations reveal previously unobserved atomic interactions that facilitate lipid vesicle adhesion to charged interfaces. Moreover, the implementation of a charged interface in molecular dynamics simulations provides an alternative method for the generation of large electric fields across phospholipid bilayers, especially for systems with periodic boundary conditions, and may be useful for simulations of membrane electropermeabilization.
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Affiliation(s)
| | - Nadica Ivošević DeNardis
- Division for Marine and Environmental Research, Ruđer Bošković Institute , 10000 Zagreb, Croatia
| | - P Thomas Vernier
- Frank Reidy Research Center for Bioelectrics, Old Dominion University , Norfolk, Virginia 23508, United States
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44
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Cui L, Decker EA. Phospholipids in foods: prooxidants or antioxidants? JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE 2016; 96:18-31. [PMID: 26108454 DOI: 10.1002/jsfa.7320] [Citation(s) in RCA: 142] [Impact Index Per Article: 17.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/02/2015] [Revised: 06/09/2015] [Accepted: 06/22/2015] [Indexed: 05/25/2023]
Abstract
Lipid oxidation is one of the major causes of quality deterioration in natural and processed foods and thus a large economic concern in the food industry. Phospholipids, especially lecithins, are already widely used as natural emulsifiers and have been gaining increasing interest as natural antioxidants to control lipid oxidation. This review summarizes the fatty acid composition and content of phospholipids naturally occurring in several foods. The role of phospholipids as substrates for lipid oxidation is discussed, with a focus on meats and dairy products. Prooxidant and antioxidant mechanisms of phospholipids are also discussed to get a better understanding of the possible opportunities for using phospholipids as food antioxidants.
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Affiliation(s)
- Leqi Cui
- Department of Food Science, University of Massachusetts, Amherst, MA 01003, USA
| | - Eric A Decker
- Department of Food Science, University of Massachusetts, Amherst, MA 01003, USA
- Bioactive Natural Products Research Group, Department of Biochemistry, Faculty of Science, King Abdulaziz University, PO Box 80203, Jeddah 21589, Saudi Arabia
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Investigation of Fatty Acid Ketohydrazone Modified Liposome's Properties as a Drug Carrier. JOURNAL OF DRUG DELIVERY 2015; 2015:481670. [PMID: 26649201 PMCID: PMC4663332 DOI: 10.1155/2015/481670] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/25/2015] [Revised: 10/02/2015] [Accepted: 10/18/2015] [Indexed: 12/05/2022]
Abstract
pH-responsive liposomes were prepared by modifying the liposome with acid-cleaving amphiphiles. Palmitic ketohydrazone (P-KH) or stearic ketohydrazone (S-KH), composed of hydrophilic sugar headgroup and hydrophobic acyl chain, was used as a modifier of the DMPC liposome. Because the ketohydrazone group of P-KH or S-KH was cleaved at low pH conditions (<pH 5.0), the delivery of the P-KH modified liposomes was observed probably via an endocytic pathway. The membrane properties of these liposomes were characterized, focusing on the variation of both polarity (measured by Laurdan) and membrane fluidity (measured by DPH) at low pH condition. The interface of the P-KH modified liposome at acidic pH was found to become more hydrophobic and less fluidic as compared with that at neutral pH; that is, P-KH modified liposome became more rigid structure. Therefore, it seems that the P-KH modified liposome could protect encapsulated drugs from the enzymes in the lysosome. This study shows the novel approach about design of pH-responsive liposomes based on the membrane properties.
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46
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Can gramicidin ion channel affect the dipole potential of neighboring phospholipid headgroups? Bioelectrochemistry 2015; 106:343-52. [DOI: 10.1016/j.bioelechem.2015.06.008] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2015] [Revised: 05/14/2015] [Accepted: 06/21/2015] [Indexed: 11/17/2022]
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47
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Becucci L, Benci S, Nuti F, Real-Fernandez F, Vaezi Z, Stella L, Venanzi M, Rovero P, Papini AM. Interaction Study of Phospholipid Membranes with an N-Glucosylated β-Turn Peptide Structure Detecting Autoantibodies Biomarkers of Multiple Sclerosis. MEMBRANES 2015; 5:576-96. [PMID: 26437433 PMCID: PMC4704000 DOI: 10.3390/membranes5040576] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/27/2015] [Accepted: 09/24/2015] [Indexed: 11/18/2022]
Abstract
The interaction of lipid environments with the type I’ β-turn peptide structure called CSF114 and its N-glucosylated form CSF114(Glc), previously developed as a synthetic antigenic probe recognizing specific autoantibodies in a subpopulation of multiple sclerosis patients’ serum, was investigated by fluorescence spectroscopy and electrochemical experiments using large unilamellar vesicles, mercury supported lipid self-assembled monolayers (SAMs) and tethered bilayer lipid membranes (tBLMs). The synthetic antigenic probe N-glucosylated peptide CSF114(Glc) and its unglucosylated form interact with the polar heads of lipid SAMs of dioleoylphosphatidylcholine at nonzero transmembrane potentials, probably establishing a dual electrostatic interaction of the trimethylammonium and phosphate groups of the phosphatidylcholine polar head with the Glu5 and His9 residues on the opposite ends of the CSF114(Glc) β-turn encompassing residues 6-9. His9 protonation at pH 7 eliminates this dual interaction. CSF114(Glc) is adsorbed on top of SAMs of mixtures of dioleoylphosphatidylcholine with sphingomyelin, an important component of myelin, whose proteins are hypothesized to undergo an aberrant N-glucosylation triggering the autoimmune response. Incorporation of the type I’ β-turn peptide structure CSF114 into lipid SAMs by potential scans of electrochemical impedance spectroscopy induces defects causing a slight permeabilization toward cadmium ions. The N-glucopeptide CSF114(Glc) does not affect tBLMs to a detectable extent.
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Affiliation(s)
- Lucia Becucci
- Department of Chemistry "Ugo Schiff", University of Florence, Via della Lastruccia 13, 50019 Sesto Fiorentino, Italy.
- Department of Chemistry, University of Padova, Via Marzolo 1, 35131 Padova, Italy.
| | - Stefano Benci
- Department of Chemistry "Ugo Schiff", University of Florence, Via della Lastruccia 13, 50019 Sesto Fiorentino, Italy
- Interdepartmental Laboratory of Peptide and Protein Chemistry and Biology, Via della Lastruccia 13, 50019 Sesto Fiorentino, Italy
| | - Francesca Nuti
- Department of Chemistry "Ugo Schiff", University of Florence, Via della Lastruccia 13, 50019 Sesto Fiorentino, Italy
- Interdepartmental Laboratory of Peptide and Protein Chemistry and Biology, Via della Lastruccia 13, 50019 Sesto Fiorentino, Italy
| | - Feliciana Real-Fernandez
- Department of Chemistry "Ugo Schiff", University of Florence, Via della Lastruccia 13, 50019 Sesto Fiorentino, Italy
- Interdepartmental Laboratory of Peptide and Protein Chemistry and Biology, Via della Lastruccia 13, 50019 Sesto Fiorentino, Italy
| | - Zahra Vaezi
- Department of Chemical Sciences and Technologies, University of Rome 'Tor Vergata', Via Ricerca Scientifica 1, 00133 Rome, Italy
| | - Lorenzo Stella
- Department of Chemical Sciences and Technologies, University of Rome 'Tor Vergata', Via Ricerca Scientifica 1, 00133 Rome, Italy
| | - Mariano Venanzi
- Department of Chemical Sciences and Technologies, University of Rome 'Tor Vergata', Via Ricerca Scientifica 1, 00133 Rome, Italy
| | - Paolo Rovero
- Interdepartmental Laboratory of Peptide and Protein Chemistry and Biology, Via della Lastruccia 13, 50019 Sesto Fiorentino, Italy
- Department of Neurosciences, Psychology, Drug Research and Child Health-Section of Pharmaceutical Sciences and Nutraceutics, University of Florence, Via Ugo Schiff 6, 50019 Sesto Fiorentino, Italy
| | - Anna Maria Papini
- Department of Chemistry "Ugo Schiff", University of Florence, Via della Lastruccia 13, 50019 Sesto Fiorentino, Italy
- Interdepartmental Laboratory of Peptide and Protein Chemistry and Biology, Via della Lastruccia 13, 50019 Sesto Fiorentino, Italy
- PeptLab@UCP Platform and Laboratory of Chemical Biology EA4505, University of Cergy-Pontoise, 5 mail Gay-Lussac, 95031 Cergy-Pontoise CEDEX, France
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48
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Laatikainen M, Srithammavut W, Toukoniitty B, Turunen I, Sainio T. Phospholipid adsorption from vegetable oils on acid-activated sepiolite. ADSORPTION 2015. [DOI: 10.1007/s10450-015-9681-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Cury TAC, Yoneda JS, Zuliani JP, Soares AM, Stábeli RG, Calderon LDA, Ciancaglini P. Cinnamic acid derived compounds loaded into liposomes: antileishmanial activity, production standardisation and characterisation. J Microencapsul 2015; 32:467-77. [PMID: 26052723 DOI: 10.3109/02652048.2015.1046518] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Synthetic compounds derived from cinnamic acid were tested in cultures containing the promastigote form of Leishmania amazonensis and the dimethylsulphoxide solution of B2 compound (2.0 mg/mL) led to a 92% decrease of leishmania in 96 h of treatment. Then, different liposomal systems (diameters ∼200 nm) were prepared by the extrusion method in the presence and absence of compounds studied. DSC thermograms of the liposomes in the presence of these compounds caused changes in ΔH, Tm and ΔT1/2, compared to controls, indicating that there was an interaction of the compounds with the lipid bilayer. Assays with negatively charged liposomal systems containing these drugs in L. amazonensis cultures led to a 50-80% decrease in the number of leishmanias with a concentration to 100 times lower when compared to the B2 initial test. These liposomal systems are promoting more interaction and delivery of the compounds and proved to be an efficient, stable and promising system.
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Affiliation(s)
- Thuanny Alexandra Campos Cury
- Departamento de Química, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto (FFCLRP), Universidade de São Paulo , Ribeirão Preto, São Paulo , Brazil
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Sharma V, Ala-Vannesluoma P, Vattulainen I, Wikström M, Róg T. Role of subunit III and its lipids in the molecular mechanism of cytochrome c oxidase. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 2015; 1847:690-7. [PMID: 25896562 DOI: 10.1016/j.bbabio.2015.04.007] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/02/2015] [Revised: 04/07/2015] [Accepted: 04/12/2015] [Indexed: 12/31/2022]
Abstract
The terminal respiratory enzyme cytochrome c oxidase (CcO) reduces molecular oxygen to water, and pumps protons across the inner mitochondrial membrane, or the plasma membrane of bacteria. A two-subunit CcO harbors all the elements necessary for oxygen reduction and proton pumping. However, it rapidly undergoes turnover-induced irreversible damage, which is effectively prevented by the presence of subunit III and its tightly bound lipids. We have performed classical atomistic molecular dynamics (MD) simulations on a three-subunit CcO, which show the formation of water wires between the polar head groups of lipid molecules bound to subunit III and the proton uptake site Asp91 (Bos taurus enzyme numbering). Continuum electrostatic calculations suggest that these lipids directly influence the proton affinity of Asp91 by 1-2pK units. We surmise that lipids bound to subunit III influence the rate of proton uptake through the D-pathway, and therefore play a key role in preventing turnover-induced inactivation. Atomistic MD simulations show that subunit III is rapidly hydrated in the absence of internally bound lipids, which is likely to affect the rate of O2 diffusion into the active-site. The role of subunit III with its indigenous lipids in the molecular mechanism of CcO is discussed.
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Affiliation(s)
- Vivek Sharma
- Department of Physics, Tampere University of Technology, FI-33101 Tampere, Finland.
| | | | - Ilpo Vattulainen
- Department of Physics, Tampere University of Technology, FI-33101 Tampere, Finland; MEMPHYS, Center for Biomembrane Physics, Department of Physics, University of Southern Denmark, Odense, Denmark
| | - Mårten Wikström
- Helsinki Bioenergetics Group, Programme for Structural Biology and Biophysics, Institute of Biotechnology, University of Helsinki, FI-00014 Helsinki, Finland
| | - Tomasz Róg
- Department of Physics, Tampere University of Technology, FI-33101 Tampere, Finland
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