101
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Ponomareva OA, Trushkin NA, Filimonov IS, Krivoshey AV, Barkhatov VI, Mitrofanov SI, Vrzheshch PV. Prostaglandin H synthase kinetics in the two-phase aqueous-micellar system. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2016; 1858:2199-2207. [PMID: 27342373 DOI: 10.1016/j.bbamem.2016.06.013] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/08/2016] [Revised: 05/28/2016] [Accepted: 06/17/2016] [Indexed: 10/21/2022]
Abstract
Reaction mixture for PGHS (prostaglandin-H-synthase) is a two-phase system including micellar hydrophobic phase and hydrophilic aqueous phase. Reagents added to the mixture are distributed between phases, thus concentrations of reagents dissolved in phases can differ significantly from their overall contents. Using dynamic light scattering we found that the hydrophobic phase produced by tween-20 consists of micelles, which radius (4-5nm) does not depend on either tween-20 overall content (0.1%-1% v/v) or arachidonic acid (AA) addition (10-1000μM) or PGHS addition (1μM). Tween-20 overall content changing from 0.1% to 2% v/v dramatically affected COX kinetic, but accounting AA distribution between phases allowed us to estimate "true" parameters, independent of the tween-20 overall content and the concentration of another substrate: KM(Ox) equals 9.8μM O2 in the aqueous phase or 0.0074bar in the gaseous phase, KM(AA) equals 5400μM AA in the phase of tween-20 micelles and 5400/PμM AA in the aqueous phase (P is the distribution ratio for the AA between the aqueous phase and the hydrophobic phase (P≫1000)). This approach allowed to evaluate PS, the distribution ratio for the AA between the hydrophobic phase and the PGHS active center (PS ~310). This coefficient indicates the AA selectivity toward the cyclooxygenase active center.
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Affiliation(s)
- Olga A Ponomareva
- International Biotechnological Center of Lomonosov Moscow State University, Russia.
| | - Nikita A Trushkin
- International Biotechnological Center of Lomonosov Moscow State University, Russia.
| | - Ivan S Filimonov
- International Biotechnological Center of Lomonosov Moscow State University, Russia.
| | - Alexandr V Krivoshey
- International Biotechnological Center of Lomonosov Moscow State University, Russia.
| | - Vladimir I Barkhatov
- International Biotechnological Center of Lomonosov Moscow State University, Russia.
| | - Sergey I Mitrofanov
- International Biotechnological Center of Lomonosov Moscow State University, Russia.
| | - Petr V Vrzheshch
- International Biotechnological Center of Lomonosov Moscow State University, Russia.
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102
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Kaur H, Lakatos A, Spadaccini R, Vogel R, Hoffmann C, Becker-Baldus J, Ouari O, Tordo P, Mchaourab H, Glaubitz C. The ABC exporter MsbA probed by solid state NMR – challenges and opportunities. Biol Chem 2016; 396:1135-49. [PMID: 25849794 DOI: 10.1515/hsz-2015-0119] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2015] [Accepted: 03/26/2015] [Indexed: 01/20/2023]
Abstract
ATP binding cassette (ABC) transporters form a superfamily of integral membrane proteins involved in translocation of substrates across the membrane driven by ATP hydrolysis. Despite available crystal structures and extensive biochemical data, many open questions regarding their transport mechanisms remain. Therefore, there is a need to explore spectroscopic techniques such as solid state NMR in order to bridge the gap between structural and mechanistic data. In this study, we investigate the feasibility of using Escherichia coli MsbA as a model ABC transporter for solid state NMR studies. We show that optimised solubilisation and reconstitution procedures enable preparing stable and homogenous protein samples. Depending on the duration of solubilisation, MsbA can be obtained in either an apo- or in a native lipid A bound form. Building onto these optimisations, the first promising MAS-NMR spectra with narrow lines have been recorded. However, further sensitivity improvements are required so that complex NMR experiments can be recorded within a reasonable amount of time. We therefore demonstrate the usability of paramagnetic doping for rapid data acquisition and explore dynamic nuclear polarisation as a method for general signal enhancement. Our results demonstrate that solid state NMR provides an opportunity to address important biological questions related to complex mechanisms of ABC transporters.
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103
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Fogeron ML, Jirasko V, Penzel S, Paul D, Montserret R, Danis C, Lacabanne D, Badillo A, Gouttenoire J, Moradpour D, Bartenschlager R, Penin F, Meier BH, Böckmann A. Cell-free expression, purification, and membrane reconstitution for NMR studies of the nonstructural protein 4B from hepatitis C virus. JOURNAL OF BIOMOLECULAR NMR 2016; 65:87-98. [PMID: 27233794 DOI: 10.1007/s10858-016-0040-2] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/08/2016] [Accepted: 05/21/2016] [Indexed: 06/05/2023]
Abstract
We describe the expression of the hepatitis C virus nonstructural protein 4B (NS4B), which is an integral membrane protein, in a wheat germ cell-free system, the subsequent purification and characterization of NS4B and its insertion into proteoliposomes in amounts sufficient for multidimensional solid-state NMR spectroscopy. First spectra of the isotopically [(2)H,(13)C,(15)N]-labeled protein are shown to yield narrow (13)C resonance lines and a proper, predominantly α-helical fold. Clean residue-selective leucine, isoleucine and threonine-labeling is demonstrated. These results evidence the suitability of the wheat germ-produced integral membrane protein NS4B for solid-state NMR. Still, the proton linewidth under fast magic angle spinning is broader than expected for a perfect sample and possible causes are discussed.
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Affiliation(s)
- Marie-Laure Fogeron
- Institut de Biologie et Chimie des Protéines, Bases Moléculaires et Structurales des Systèmes Infectieux, Labex Ecofect, UMR 5086 CNRS, Université de Lyon, 7 passage du Vercors, 69367, Lyon, France
| | - Vlastimil Jirasko
- Physical Chemistry, ETH Zurich, 8093, Zurich, Switzerland
- Department of Infectious Diseases, Molecular Virology, Heidelberg University, Im Neuenheimer Feld 345, 69120, Heidelberg, Germany
- German Centre for Infection Research (DZIF), Partner Site Heidelberg, Heidelberg, Germany
| | - Susanne Penzel
- Physical Chemistry, ETH Zurich, 8093, Zurich, Switzerland
| | - David Paul
- Department of Infectious Diseases, Molecular Virology, Heidelberg University, Im Neuenheimer Feld 345, 69120, Heidelberg, Germany
- German Centre for Infection Research (DZIF), Partner Site Heidelberg, Heidelberg, Germany
| | - Roland Montserret
- Institut de Biologie et Chimie des Protéines, Bases Moléculaires et Structurales des Systèmes Infectieux, Labex Ecofect, UMR 5086 CNRS, Université de Lyon, 7 passage du Vercors, 69367, Lyon, France
| | - Clément Danis
- Institut de Biologie et Chimie des Protéines, Bases Moléculaires et Structurales des Systèmes Infectieux, Labex Ecofect, UMR 5086 CNRS, Université de Lyon, 7 passage du Vercors, 69367, Lyon, France
| | - Denis Lacabanne
- Institut de Biologie et Chimie des Protéines, Bases Moléculaires et Structurales des Systèmes Infectieux, Labex Ecofect, UMR 5086 CNRS, Université de Lyon, 7 passage du Vercors, 69367, Lyon, France
| | - Aurélie Badillo
- Institut de Biologie et Chimie des Protéines, Bases Moléculaires et Structurales des Systèmes Infectieux, Labex Ecofect, UMR 5086 CNRS, Université de Lyon, 7 passage du Vercors, 69367, Lyon, France
- Recombinant Protein Unit, RD-Biotech, 3 rue Henri Baigue, 25000, Besançon, France
| | - Jérôme Gouttenoire
- Division of Gastroenterology and Hepatology, Centre Hospitalier Universitaire Vaudois, University of Lausanne, 1011, Lausanne, Switzerland
| | - Darius Moradpour
- Division of Gastroenterology and Hepatology, Centre Hospitalier Universitaire Vaudois, University of Lausanne, 1011, Lausanne, Switzerland
| | - Ralf Bartenschlager
- Department of Infectious Diseases, Molecular Virology, Heidelberg University, Im Neuenheimer Feld 345, 69120, Heidelberg, Germany
- German Centre for Infection Research (DZIF), Partner Site Heidelberg, Heidelberg, Germany
| | - François Penin
- Institut de Biologie et Chimie des Protéines, Bases Moléculaires et Structurales des Systèmes Infectieux, Labex Ecofect, UMR 5086 CNRS, Université de Lyon, 7 passage du Vercors, 69367, Lyon, France
| | - Beat H Meier
- Physical Chemistry, ETH Zurich, 8093, Zurich, Switzerland.
| | - Anja Böckmann
- Institut de Biologie et Chimie des Protéines, Bases Moléculaires et Structurales des Systèmes Infectieux, Labex Ecofect, UMR 5086 CNRS, Université de Lyon, 7 passage du Vercors, 69367, Lyon, France.
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104
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Niroomand H, Venkatesan GA, Sarles SA, Mukherjee D, Khomami B. Lipid-Detergent Phase Transitions During Detergent-Mediated Liposome Solubilization. J Membr Biol 2016; 249:523-38. [DOI: 10.1007/s00232-016-9894-1] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2015] [Accepted: 03/24/2016] [Indexed: 11/24/2022]
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105
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Ghosh Moulick R, Afanasenkau D, Choi SE, Albers J, Lange W, Maybeck V, Utesch T, Offenhäusser A. Reconstitution of Fusion Proteins in Supported Lipid Bilayers for the Study of Cell Surface Receptor-Ligand Interactions in Cell-Cell Contact. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:3462-3469. [PMID: 26986674 DOI: 10.1021/acs.langmuir.5b04644] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Bioactive molecules such as adhesion ligands, growth factors, or enzymes play an important role in modulating cell behavior such as cell adhesion, spreading, and differentiation. Deciphering the mechanism of ligand-mediated cell adhesion and associated signaling is of great interest not only for fundamental biophysical investigations but also for applications in medicine and biotechnology. In the presented work, we developed a new biomimetic platform that enables culturing primary neurons and testing cell surface-receptor ligand interactions in cell-cell contacts as, e.g., in neuronal synapses. This platform consists of a supported lipid bilayer modified with incorporated neuronal adhesion proteins conjugated with the Fc-domain of IgG (ephrin A5 Fc-chimera). We extensively characterized properties of these protein containing bilayers using fluorescence recovery after photobleaching (FRAP), quartz crystal microbalance with dissipation (QCM-D), and immunostaining. We conclude that the Fc-domain is the part responsible for the incorporation of the protein into the bilayer. The biomimetic platform prepared by this new approach was able to promote neuronal cell adhesion and maintain growth as well as facilitate neuronal maturation as shown by electrophysiological measurements. We believe that our approach can be extended to insert other proteins to create a general culture platform for neurons and other cell types.
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Affiliation(s)
- R Ghosh Moulick
- Institute for Bioelectronics (ICS-8), Forschungszentrum Jülich , Wilhelm-Johnen Straße, 52425 Jülich, Germany
| | - D Afanasenkau
- Institute for Bioelectronics (ICS-8), Forschungszentrum Jülich , Wilhelm-Johnen Straße, 52425 Jülich, Germany
| | - S-E Choi
- Institute for Bioelectronics (ICS-8), Forschungszentrum Jülich , Wilhelm-Johnen Straße, 52425 Jülich, Germany
| | - J Albers
- Institute for Bioelectronics (ICS-8), Forschungszentrum Jülich , Wilhelm-Johnen Straße, 52425 Jülich, Germany
| | - W Lange
- Institute for Bioelectronics (ICS-8), Forschungszentrum Jülich , Wilhelm-Johnen Straße, 52425 Jülich, Germany
| | - V Maybeck
- Institute for Bioelectronics (ICS-8), Forschungszentrum Jülich , Wilhelm-Johnen Straße, 52425 Jülich, Germany
| | - T Utesch
- Department of Chemistry, Technische Universität Berlin , Straße des 17. Juni 135, 10623 Berlin, Germany
| | - A Offenhäusser
- Institute for Bioelectronics (ICS-8), Forschungszentrum Jülich , Wilhelm-Johnen Straße, 52425 Jülich, Germany
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106
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Schmitt C, Lippert AH, Bonakdar N, Sandoghdar V, Voll LM. Compartmentalization and Transport in Synthetic Vesicles. Front Bioeng Biotechnol 2016; 4:19. [PMID: 26973834 PMCID: PMC4770187 DOI: 10.3389/fbioe.2016.00019] [Citation(s) in RCA: 52] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2015] [Accepted: 02/11/2016] [Indexed: 12/03/2022] Open
Abstract
Nanoscale vesicles have become a popular tool in life sciences. Besides liposomes that are generated from phospholipids of natural origin, polymersomes fabricated of synthetic block copolymers enjoy increasing popularity, as they represent more versatile membrane building blocks that can be selected based on their specific physicochemical properties, such as permeability, stability, or chemical reactivity. In this review, we focus on the application of simple and nested artificial vesicles in synthetic biology. First, we provide an introduction into the utilization of multicompartmented vesosomes as compartmentalized nanoscale bioreactors. In the bottom-up development of protocells from vesicular nanoreactors, the specific exchange of pathway intermediates across compartment boundaries represents a bottleneck for future studies. To date, most compartmented bioreactors rely on unspecific exchange of substrates and products. This is either based on changes in permeability of the coblock polymer shell by physicochemical triggers or by the incorporation of unspecific porin proteins into the vesicle membrane. Since the incorporation of membrane transport proteins into simple and nested artificial vesicles offers the potential for specific exchange of substances between subcompartments, it opens new vistas in the design of protocells. Therefore, we devote the main part of the review to summarize the technical advances in the use of phospholipids and block copolymers for the reconstitution of membrane proteins.
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Affiliation(s)
- Christine Schmitt
- Division of Biochemistry, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
| | - Anna H. Lippert
- Max-Planck-Institute for the Science of Light, Erlangen, Germany
| | - Navid Bonakdar
- Max-Planck-Institute for the Science of Light, Erlangen, Germany
| | - Vahid Sandoghdar
- Max-Planck-Institute for the Science of Light, Erlangen, Germany
| | - Lars M. Voll
- Division of Biochemistry, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
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107
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Ando M, Akiyama M, Okuno D, Hirano M, Ide T, Sawada S, Sasaki Y, Akiyoshi K. Liposome chaperon in cell-free membrane protein synthesis: one-step preparation of KcsA-integrated liposomes and electrophysiological analysis by the planar bilayer method. Biomater Sci 2016; 4:258-64. [DOI: 10.1039/c5bm00285k] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Chaperoning functions of liposomes were investigated using cell-free membrane protein synthesis.
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Affiliation(s)
- M. Ando
- Department of Polymer Chemistry
- Graduate School of Engineering
- Kyoto University
- Kyoto
- Japan
| | - M. Akiyama
- Department of Polymer Chemistry
- Graduate School of Engineering
- Kyoto University
- Kyoto
- Japan
| | - D. Okuno
- Laboratory for Cell Dynamics Observation
- Quantitative Biology Center
- RIKEN
- Osaka 565-0874
- Japan
| | - M. Hirano
- Laboratory for Cell Dynamics Observation
- Quantitative Biology Center
- RIKEN
- Osaka 565-0874
- Japan
| | - T. Ide
- Graduate School of Natural Science and Technology
- Okayama University
- Okayama 700-8530
- Japan
| | - S. Sawada
- Department of Polymer Chemistry
- Graduate School of Engineering
- Kyoto University
- Kyoto
- Japan
| | - Y. Sasaki
- Department of Polymer Chemistry
- Graduate School of Engineering
- Kyoto University
- Kyoto
- Japan
| | - K. Akiyoshi
- Department of Polymer Chemistry
- Graduate School of Engineering
- Kyoto University
- Kyoto
- Japan
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108
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Logez C, Damian M, Legros C, Dupré C, Guéry M, Mary S, Wagner R, M’Kadmi C, Nosjean O, Fould B, Marie J, Fehrentz JA, Martinez J, Ferry G, Boutin JA, Banères JL. Detergent-free Isolation of Functional G Protein-Coupled Receptors into Nanometric Lipid Particles. Biochemistry 2015; 55:38-48. [DOI: 10.1021/acs.biochem.5b01040] [Citation(s) in RCA: 73] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Christel Logez
- Pole
d’expertise Biotechnologie, Chimie, Biologie, Institut de Recherches Servier, 125, chemin de Ronde, F-78290 Croissy-sur-Seine, France
| | - Marjorie Damian
- Faculté
de Pharmacie, Institut des Biomolécules Max Mousseron (IBMM), UMR 5247 CNRS-Université Montpellier-ENSCM, 15 Avenue C. Flahault, F-34093 Montpellier, France
| | - Céline Legros
- Pole
d’expertise Biotechnologie, Chimie, Biologie, Institut de Recherches Servier, 125, chemin de Ronde, F-78290 Croissy-sur-Seine, France
| | - Clémence Dupré
- Pole
d’expertise Biotechnologie, Chimie, Biologie, Institut de Recherches Servier, 125, chemin de Ronde, F-78290 Croissy-sur-Seine, France
| | - Mélody Guéry
- Faculté
de Pharmacie, Institut des Biomolécules Max Mousseron (IBMM), UMR 5247 CNRS-Université Montpellier-ENSCM, 15 Avenue C. Flahault, F-34093 Montpellier, France
| | - Sophie Mary
- Faculté
de Pharmacie, Institut des Biomolécules Max Mousseron (IBMM), UMR 5247 CNRS-Université Montpellier-ENSCM, 15 Avenue C. Flahault, F-34093 Montpellier, France
| | - Renaud Wagner
- CNRS
UMR7242, Institut de Recherche de l’ESBS, Biotechnologie et
Signalisation Cellulaire, Université de Strasbourg, 300 Boulevard
Sébastien Brant, 67412 Ilkirch cedex, France
| | - Céline M’Kadmi
- Faculté
de Pharmacie, Institut des Biomolécules Max Mousseron (IBMM), UMR 5247 CNRS-Université Montpellier-ENSCM, 15 Avenue C. Flahault, F-34093 Montpellier, France
| | - Olivier Nosjean
- Pole
d’expertise Biotechnologie, Chimie, Biologie, Institut de Recherches Servier, 125, chemin de Ronde, F-78290 Croissy-sur-Seine, France
| | - Benjamin Fould
- Pole
d’expertise Biotechnologie, Chimie, Biologie, Institut de Recherches Servier, 125, chemin de Ronde, F-78290 Croissy-sur-Seine, France
| | - Jacky Marie
- Faculté
de Pharmacie, Institut des Biomolécules Max Mousseron (IBMM), UMR 5247 CNRS-Université Montpellier-ENSCM, 15 Avenue C. Flahault, F-34093 Montpellier, France
| | - Jean-Alain Fehrentz
- Faculté
de Pharmacie, Institut des Biomolécules Max Mousseron (IBMM), UMR 5247 CNRS-Université Montpellier-ENSCM, 15 Avenue C. Flahault, F-34093 Montpellier, France
| | - Jean Martinez
- Faculté
de Pharmacie, Institut des Biomolécules Max Mousseron (IBMM), UMR 5247 CNRS-Université Montpellier-ENSCM, 15 Avenue C. Flahault, F-34093 Montpellier, France
| | - Gilles Ferry
- Pole
d’expertise Biotechnologie, Chimie, Biologie, Institut de Recherches Servier, 125, chemin de Ronde, F-78290 Croissy-sur-Seine, France
| | - Jean A. Boutin
- Pole
d’expertise Biotechnologie, Chimie, Biologie, Institut de Recherches Servier, 125, chemin de Ronde, F-78290 Croissy-sur-Seine, France
| | - Jean-Louis Banères
- Faculté
de Pharmacie, Institut des Biomolécules Max Mousseron (IBMM), UMR 5247 CNRS-Université Montpellier-ENSCM, 15 Avenue C. Flahault, F-34093 Montpellier, France
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109
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von Ballmoos C, Biner O, Nilsson T, Brzezinski P. Mimicking respiratory phosphorylation using purified enzymes. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 2015; 1857:321-31. [PMID: 26707617 DOI: 10.1016/j.bbabio.2015.12.007] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 08/17/2015] [Revised: 11/17/2015] [Accepted: 12/16/2015] [Indexed: 11/26/2022]
Abstract
The enzymes of oxidative phosphorylation is a striking example of the functional association of multiple enzyme complexes, working together to form ATP from cellular reducing equivalents. These complexes, such as cytochrome c oxidase or the ATP synthase, are typically investigated individually and therefore, their functional interplay is not well understood. Here, we present methodology that allows the co-reconstitution of purified terminal oxidases and ATP synthases in synthetic liposomes. The enzymes are functionally coupled via proton translocation where upon addition of reducing equivalents the oxidase creates and maintains a transmembrane electrochemical proton gradient that energizes the synthesis of ATP by the F1F0 ATP synthase. The method has been tested with the ATP synthases from Escherichia coli and spinach chloroplasts, and with the quinol and cytochrome c oxidases from E. coli and Rhodobacter sphaeroides, respectively. Unlike in experiments with the ATP synthase reconstituted alone, the setup allows in vitro ATP synthesis under steady state conditions, with rates up to 90 ATP×s(-1)×enzyme(-1). We have also used the novel system to study the phenomenon of "mild uncoupling" as observed in mitochondria upon addition of low concentrations of ionophores (e.g. FCCP, SF6847) and the recoupling effect of 6-ketocholestanol. While we could reproduce the described effects, our data with the in vitro system does not support the idea of a direct interaction between a mitochondrial protein and the uncoupling agents as proposed earlier.
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Affiliation(s)
- Christoph von Ballmoos
- Department of Chemistry and Biochemistry, University of Bern, Freiestrasse 3, 3012 Bern, Switzerland.
| | - Olivier Biner
- Department of Chemistry and Biochemistry, University of Bern, Freiestrasse 3, 3012 Bern, Switzerland
| | - Tobias Nilsson
- Department of Biochemistry and Biophysics, The Arrhenius Laboratories for Natural Sciences, Stockholm University, SE-106 91 Stockholm, Sweden
| | - Peter Brzezinski
- Department of Biochemistry and Biophysics, The Arrhenius Laboratories for Natural Sciences, Stockholm University, SE-106 91 Stockholm, Sweden
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110
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Preparing giant unilamellar vesicles (GUVs) of complex lipid mixtures on demand: Mixing small unilamellar vesicles of compositionally heterogeneous mixtures. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2015; 1848:3175-80. [DOI: 10.1016/j.bbamem.2015.09.020] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/26/2015] [Revised: 08/16/2015] [Accepted: 09/22/2015] [Indexed: 11/18/2022]
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111
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Xiong W, Quan C, Zhang X, Wang L, Liu B, Jin L, Fan S. Quantitative analysis of protein orientation in membrane environments by kinase activity. J Biosci Bioeng 2015; 121:242-6. [PMID: 26560241 DOI: 10.1016/j.jbiosc.2015.06.002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2015] [Revised: 05/25/2015] [Accepted: 06/10/2015] [Indexed: 02/07/2023]
Abstract
AgrC is an integral membrane receptor protein with histidine kinase activity in the accessory gene regulator (agr) quorum-sensing system of Staphylococcus aureus. In this study, proteoliposomes were used as a model to investigate AgrC orientation. Many approaches have been described to determine membrane protein orientation, but they are often complicated and time consuming. In this study, AgrC orientation in liposomes was determined by thiol-reactive reagent labeling and a kinase activity assay. Our results suggest use of a kinase activity assay could get an accurate percentage of functional protein orientation and only cost nearly one-sixth of the time compared with the method based on thiol-reactive reagent labeling. We present an effective and rapid method for determining the orientation of membrane protein kinases like AgrC.
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Affiliation(s)
- Wen Xiong
- Department of Life Science, Dalian Nationalities University, Economical and Technological Development Zone, Dalian 116600, China; Key Laboratory of Biotechnology and Resource Utilization, State Ethnic Affairs Commission and Ministry of Education, Dalian Nationalities University, Economical and Technological Development Zone, Dalian 116600, China.
| | - Chunshan Quan
- Department of Life Science, Dalian Nationalities University, Economical and Technological Development Zone, Dalian 116600, China; Key Laboratory of Biotechnology and Resource Utilization, State Ethnic Affairs Commission and Ministry of Education, Dalian Nationalities University, Economical and Technological Development Zone, Dalian 116600, China.
| | - Xuning Zhang
- School of Biological Engineering, Dalian Polytechnic University, 1 Qinggongyuan, Dalian 116034, China.
| | - Lina Wang
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhong-shan Road, Dalian 116023, China.
| | - Baoquan Liu
- Department of Life Science, Dalian Nationalities University, Economical and Technological Development Zone, Dalian 116600, China; Key Laboratory of Biotechnology and Resource Utilization, State Ethnic Affairs Commission and Ministry of Education, Dalian Nationalities University, Economical and Technological Development Zone, Dalian 116600, China.
| | - Liming Jin
- Department of Life Science, Dalian Nationalities University, Economical and Technological Development Zone, Dalian 116600, China; Key Laboratory of Biotechnology and Resource Utilization, State Ethnic Affairs Commission and Ministry of Education, Dalian Nationalities University, Economical and Technological Development Zone, Dalian 116600, China.
| | - Shengdi Fan
- Department of Life Science, Dalian Nationalities University, Economical and Technological Development Zone, Dalian 116600, China; Key Laboratory of Biotechnology and Resource Utilization, State Ethnic Affairs Commission and Ministry of Education, Dalian Nationalities University, Economical and Technological Development Zone, Dalian 116600, China.
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112
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Clarke OB, Tomasek D, Jorge CD, Dufrisne MB, Kim M, Banerjee S, Rajashankar KR, Shapiro L, Hendrickson WA, Santos H, Mancia F. Structural basis for phosphatidylinositol-phosphate biosynthesis. Nat Commun 2015; 6:8505. [PMID: 26510127 PMCID: PMC4634129 DOI: 10.1038/ncomms9505] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2015] [Accepted: 08/29/2015] [Indexed: 11/24/2022] Open
Abstract
Phosphatidylinositol is critical for intracellular signalling and anchoring of carbohydrates and proteins to outer cellular membranes. The defining step in phosphatidylinositol biosynthesis is catalysed by CDP-alcohol phosphotransferases, transmembrane enzymes that use CDP-diacylglycerol as donor substrate for this reaction, and either inositol in eukaryotes or inositol phosphate in prokaryotes as the acceptor alcohol. Here we report the structures of a related enzyme, the phosphatidylinositol-phosphate synthase from Renibacterium salmoninarum, with and without bound CDP-diacylglycerol to 3.6 and 2.5 Å resolution, respectively. These structures reveal the location of the acceptor site, and the molecular determinants of substrate specificity and catalysis. Functional characterization of the 40%-identical ortholog from Mycobacterium tuberculosis, a potential target for the development of novel anti-tuberculosis drugs, supports the proposed mechanism of substrate binding and catalysis. This work therefore provides a structural and functional framework to understand the mechanism of phosphatidylinositol-phosphate biosynthesis.
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Affiliation(s)
- Oliver B. Clarke
- Department of Biochemistry and Molecular Biophysics, Columbia University, New York, NY 10032, USA
| | - David Tomasek
- Department of Physiology and Cellular Biophysics, Columbia University, New York, NY 10032, USA
| | - Carla D. Jorge
- Biology Division, Instituto de Tecnologia Química e Biológica, Universidade Nova de Lisboa, Avenida da República-EAN, 2780-157 Oeiras, Portugal
| | - Meagan Belcher Dufrisne
- Department of Physiology and Cellular Biophysics, Columbia University, New York, NY 10032, USA
| | - Minah Kim
- Department of Physiology and Cellular Biophysics, Columbia University, New York, NY 10032, USA
| | - Surajit Banerjee
- NE-CAT and Department of Chemistry and Chemical Biology, Cornell University, Argonne National Laboratory, Argonne, IL 60439, USA
| | - Kanagalaghatta R. Rajashankar
- NE-CAT and Department of Chemistry and Chemical Biology, Cornell University, Argonne National Laboratory, Argonne, IL 60439, USA
| | - Lawrence Shapiro
- Department of Biochemistry and Molecular Biophysics, Columbia University, New York, NY 10032, USA
| | - Wayne A. Hendrickson
- Department of Biochemistry and Molecular Biophysics, Columbia University, New York, NY 10032, USA
| | - Helena Santos
- Biology Division, Instituto de Tecnologia Química e Biológica, Universidade Nova de Lisboa, Avenida da República-EAN, 2780-157 Oeiras, Portugal
| | - Filippo Mancia
- Department of Physiology and Cellular Biophysics, Columbia University, New York, NY 10032, USA
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113
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Graf S, Broll C, Wissig J, Strecker A, Parowatkin M, Unden G. CitA (citrate) and DcuS (C4-dicarboxylate) sensor kinases in thermophilic Geobacillus kaustophilus and Geobacillus thermodenitrificans. MICROBIOLOGY-SGM 2015; 162:127-137. [PMID: 26346610 DOI: 10.1099/mic.0.000171] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
The thermophilic Geobacillus thermodenitrificans and Geobacillus kaustophilus are able to use citrate or C4-dicarboxylates like fumarate or succinate as the substrates for growth. The genomes of the sequenced Geobacillus strains (nine strains) each encoded a two-component system of the CitA family. The sensor kinase of G. thermodenitrificans (termed CitAGt) was able to replace CitA of Escherichia coli (CitAEc) in a heterologous complementation assay restoring expression of the CitAEc-dependent citC-lacZ reporter gene and anaerobic growth on citrate. Complementation was specific for citrate. The sensor kinase of G. kaustophilus (termed DcuSGk) was able to replace DcuSEc of E. coli. It responded in the heterologous expression system to C4-dicarboxylates and to citrate, suggesting that DcuSGk is, like DcuSEc, a C4-dicarboxylate sensor with a side-activity for citrate. DcuSGk, unlike the homologous DctS from Bacillus subtilis, required no binding protein for function in the complementation assay. Thus, the thermophilic G. thermodenitrificans and G. kaustophilus contain citrate and C4-dicarboxylate sensor kinases of the CitA and DcuS type, respectively, and retain function and substrate specificity under mesophilic growth conditions in E. coli.
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Affiliation(s)
- Sabrina Graf
- Institute for Microbiology and Wine Research, Johannes Gutenberg University Mainz, 55099 Mainz, Germany
| | - Constanze Broll
- Institute for Microbiology and Wine Research, Johannes Gutenberg University Mainz, 55099 Mainz, Germany
| | - Juliane Wissig
- Institute for Microbiology and Wine Research, Johannes Gutenberg University Mainz, 55099 Mainz, Germany
| | - Alexander Strecker
- Institute for Microbiology and Wine Research, Johannes Gutenberg University Mainz, 55099 Mainz, Germany
| | - Maria Parowatkin
- Institute for Microbiology and Wine Research, Johannes Gutenberg University Mainz, 55099 Mainz, Germany
| | - Gottfried Unden
- Institute for Microbiology and Wine Research, Johannes Gutenberg University Mainz, 55099 Mainz, Germany
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114
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Cole CM, Brea RJ, Kim YH, Hardy MD, Yang J, Devaraj NK. Spontaneous Reconstitution of Functional Transmembrane Proteins During Bioorthogonal Phospholipid Membrane Synthesis. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201504339] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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115
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Cole CM, Brea RJ, Kim YH, Hardy MD, Yang J, Devaraj NK. Spontaneous Reconstitution of Functional Transmembrane Proteins During Bioorthogonal Phospholipid Membrane Synthesis. Angew Chem Int Ed Engl 2015; 54:12738-42. [PMID: 26316292 DOI: 10.1002/anie.201504339] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2015] [Revised: 07/02/2015] [Indexed: 11/11/2022]
Abstract
Transmembrane proteins are critical for signaling, transport, and metabolism, yet their reconstitution in synthetic membranes is often challenging. Non-enzymatic and chemoselective methods to generate phospholipid membranes in situ would be powerful tools for the incorporation of membrane proteins. Herein, the spontaneous reconstitution of functional integral membrane proteins during the de novo synthesis of biomimetic phospholipid bilayers is described. The approach takes advantage of bioorthogonal coupling reactions to generate proteoliposomes from micelle-solubilized proteins. This method was successfully used to reconstitute three different transmembrane proteins into synthetic membranes. This is the first example of the use of non-enzymatic chemical synthesis of phospholipids to prepare proteoliposomes.
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Affiliation(s)
- Christian M Cole
- Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, Building: Urey Hall 4120, La Jolla, CA 92093 (USA) http://devarajgroup.ucsd.edu
| | - Roberto J Brea
- Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, Building: Urey Hall 4120, La Jolla, CA 92093 (USA) http://devarajgroup.ucsd.edu
| | - Young Hun Kim
- Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, Building: Pacific Hall 6160, La Jolla, CA 92093 (USA)
| | - Michael D Hardy
- Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, Building: Urey Hall 4120, La Jolla, CA 92093 (USA) http://devarajgroup.ucsd.edu
| | - Jerry Yang
- Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, Building: Pacific Hall 6160, La Jolla, CA 92093 (USA)
| | - Neal K Devaraj
- Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, Building: Urey Hall 4120, La Jolla, CA 92093 (USA) http://devarajgroup.ucsd.edu.
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116
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Inducible release of particulates from liposomes using the mechanosensitive channel of large conductance and L-α-lysophosphatidylcholine. EUROPEAN BIOPHYSICS JOURNAL: EBJ 2015; 44:521-30. [PMID: 26143502 DOI: 10.1007/s00249-015-1055-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/31/2014] [Revised: 06/07/2015] [Accepted: 06/17/2015] [Indexed: 01/05/2023]
Abstract
The mechanosensitive channel of large conductance (MscL) from Escherichia coli is a prototype for the mechanosensitive class of ion channels and opens one of the largest known gated transmembrane pores. As such, MscL offers the structural framework for the development of liposomal nanovalves for biotechnological applications. Here we incorporated MscL into liposomes and investigated the effects of L-α-lysophosphatidylcholine (LPC) with varying acyl chain lengths or saturation on its pore gating. This was measured by the efflux of encapsulated 5,6-carboxyfluorescein (CF) from the MscL proteoliposomes. Efflux improved in the presence of shorter and double-bonded LPC acyl chains. It was also dependent on the detergent concentration employed during MscL purification. MscL purified in 2 mM dodecyl β-D-maltopyranoside (DDM) had a marked increase in CF efflux compared to MscL purified in 1 mM DDM when treated with LPC. The purification conditions also resulted in increased efflux from proteoliposomes containing the G22C-MscL pore mutant channel, which requires higher membrane tension for its activation compared to WT-MscL.
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117
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Heydenreich FM, Vuckovic Z, Matkovic M, Veprintsev DB. Stabilization of G protein-coupled receptors by point mutations. Front Pharmacol 2015; 6:82. [PMID: 25941489 PMCID: PMC4403299 DOI: 10.3389/fphar.2015.00082] [Citation(s) in RCA: 56] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2015] [Accepted: 03/31/2015] [Indexed: 11/13/2022] Open
Abstract
G protein-coupled receptors (GPCRs) are flexible integral membrane proteins involved in transmembrane signaling. Their involvement in many physiological processes makes them interesting targets for drug development. Determination of the structure of these receptors will help to design more specific drugs, however, their structural characterization has so far been hampered by the low expression and their inherent instability in detergents which made protein engineering indispensable for structural and biophysical characterization. Several approaches to stabilize the receptors in a particular conformation have led to breakthroughs in GPCR structure determination. These include truncations of the flexible regions, stabilization by antibodies and nanobodies, fusion partners, high affinity and covalently bound ligands as well as conformational stabilization by mutagenesis. In this review we focus on stabilization of GPCRs by insertion of point mutations, which lead to increased conformational and thermal stability as well as improved expression levels. We summarize existing mutagenesis strategies with different coverage of GPCR sequence space and depth of information, design and transferability of mutations and the molecular basis for stabilization. We also discuss whether mutations alter the structure and pharmacological properties of GPCRs.
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Affiliation(s)
- Franziska M Heydenreich
- Laboratory of Biomolecular Research, Paul Scherrer Institut Villigen, Switzerland ; Department of Biology, ETH Zürich Zürich, Switzerland
| | - Ziva Vuckovic
- Laboratory of Biomolecular Research, Paul Scherrer Institut Villigen, Switzerland ; Department of Biology, ETH Zürich Zürich, Switzerland
| | - Milos Matkovic
- Laboratory of Biomolecular Research, Paul Scherrer Institut Villigen, Switzerland ; Department of Biology, ETH Zürich Zürich, Switzerland
| | - Dmitry B Veprintsev
- Laboratory of Biomolecular Research, Paul Scherrer Institut Villigen, Switzerland ; Department of Biology, ETH Zürich Zürich, Switzerland
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118
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Lopes SC, Ferreira M, Sousa CF, Gameiro P. A fast way to track functional OmpF reconstitution in liposomes: Escherichia coli total lipid extract. Anal Biochem 2015; 479:54-9. [PMID: 25841673 DOI: 10.1016/j.ab.2015.03.026] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2015] [Revised: 03/24/2015] [Accepted: 03/25/2015] [Indexed: 10/23/2022]
Abstract
A major requirement to perform structural studies with membrane proteins is to define efficient reconstitution protocols that ensure a high incorporation degree and protein directionality and topology that mimics its in vivo conditions. For this kind of studies, protein reconstitution in membrane systems via a detergent-mediated pathway is usually successfully adopted because detergents are generally used in the initial isolation and purification of membrane proteins. This study reports OmpF reconstitution in preformed Escherichia coli liposomes followed by detection of its insertion by analyzing modifications on membrane structure by two different techniques: steady-state fluorescence anisotropy and dynamic light scattering. Another important issue is protein directionality. For OmpF, it is known that interaction with polyamines promotes channel blockage. In this work, the spermine-OmpF interaction was evaluated using surface plasmon resonance, and protein directionality was confirmed.
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Affiliation(s)
- S C Lopes
- UCIBIO@Requimte, Faculdade de Ciências, Universidade do Porto, 4169-007 Porto, Portugal
| | - M Ferreira
- UCIBIO@Requimte, Faculdade de Ciências, Universidade do Porto, 4169-007 Porto, Portugal
| | - C F Sousa
- UCIBIO@Requimte, Faculdade de Ciências, Universidade do Porto, 4169-007 Porto, Portugal
| | - P Gameiro
- UCIBIO@Requimte, Faculdade de Ciências, Universidade do Porto, 4169-007 Porto, Portugal.
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119
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Wang L, Tonggu L. Membrane protein reconstitution for functional and structural studies. SCIENCE CHINA-LIFE SCIENCES 2015; 58:66-74. [PMID: 25576454 DOI: 10.1007/s11427-014-4769-0] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/15/2014] [Accepted: 10/27/2014] [Indexed: 10/24/2022]
Abstract
Membrane proteins are involved in various critical biological processes, and studying membrane proteins represents a major challenge in protein biochemistry. As shown by both structural and functional studies, the membrane environment plays an essential role for membrane proteins. In vitro studies are reliant on the successful reconstitution of membrane proteins. This review describes the interaction between detergents and lipids that aids the understanding of the reconstitution processes. Then the techniques of detergent removal and a few useful techniques to refine the formed proteoliposomes are reviewed. Finally the applications of reconstitution techniques to study membrane proteins involved in Ca(2+) signaling are summarized.
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Affiliation(s)
- LiGuo Wang
- Department of Biological Structure, University of Washington, Seattle, Washington, 98195, USA,
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120
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Faust JE, Desai T, Verma A, Ulengin I, Sun TL, Moss TJ, Betancourt-Solis MA, Huang HW, Lee T, McNew JA. The Atlastin C-terminal tail is an amphipathic helix that perturbs the bilayer structure during endoplasmic reticulum homotypic fusion. J Biol Chem 2015; 290:4772-4783. [PMID: 25555915 DOI: 10.1074/jbc.m114.601823] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
Abstract
Fusion of tubular membranes is required to form three-way junctions found in reticular subdomains of the endoplasmic reticulum. The large GTPase Atlastin has recently been shown to drive endoplasmic reticulum membrane fusion and three-way junction formation. The mechanism of Atlastin-mediated membrane fusion is distinct from SNARE-mediated membrane fusion, and many details remain unclear. In particular, the role of the amphipathic C-terminal tail of Atlastin is still unknown. We found that a peptide corresponding to the Atlastin C-terminal tail binds to membranes as a parallel α helix, induces bilayer thinning, and increases acyl chain disorder. The function of the C-terminal tail is conserved in human Atlastin. Mutations in the C-terminal tail decrease fusion activity in vitro, but not GTPase activity, and impair Atlastin function in vivo. In the context of unstable lipid bilayers, the requirement for the C-terminal tail is abrogated. These data suggest that the C-terminal tail of Atlastin locally destabilizes bilayers to facilitate membrane fusion.
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Affiliation(s)
- Joseph E Faust
- Department of Biochemistry and Cell Biology, Rice University, Houston Texas 77005
| | - Tanvi Desai
- Department of Biochemistry and Cell Biology, Rice University, Houston Texas 77005
| | - Avani Verma
- Department of Biochemistry and Cell Biology, Rice University, Houston Texas 77005
| | - Idil Ulengin
- Department of Biological Sciences, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213
| | - Tzu-Lin Sun
- Department of Physics and Astronomy, Rice University, Houston, Texas 77005
| | - Tyler J Moss
- Department of Biochemistry and Cell Biology, Rice University, Houston Texas 77005
| | | | - Huey W Huang
- Department of Physics and Astronomy, Rice University, Houston, Texas 77005
| | - Tina Lee
- Department of Biological Sciences, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213
| | - James A McNew
- Department of Biochemistry and Cell Biology, Rice University, Houston Texas 77005,.
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121
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Tabaei SR, Cho NJ. Lamellar sheet exfoliation of single lipid vesicles by a membrane-active peptide. Chem Commun (Camb) 2015; 51:10272-5. [DOI: 10.1039/c5cc02769a] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Using total internal fluorescence microscopy, highly parallel measurements of single lipid vesicles unexpectedly reveal that a small fraction of vesicles rupture in multiple discrete steps when destabilized by a membrane-active peptide which is in contrast to classical solubilization models.
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Affiliation(s)
- Seyed R. Tabaei
- School of Materials Science and Engineering
- Nanyang Technological University
- Singapore
- Centre for Biomimetic Sensor Science
- Nanyang Technological University
| | - N. J. Cho
- School of Materials Science and Engineering
- Nanyang Technological University
- Singapore
- Centre for Biomimetic Sensor Science
- Nanyang Technological University
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122
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Preobraschenski J, Zander JF, Suzuki T, Ahnert-Hilger G, Jahn R. Vesicular Glutamate Transporters Use Flexible Anion and Cation Binding Sites for Efficient Accumulation of Neurotransmitter. Neuron 2014; 84:1287-301. [DOI: 10.1016/j.neuron.2014.11.008] [Citation(s) in RCA: 69] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/04/2014] [Indexed: 11/16/2022]
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123
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Surma MA, Szczepaniak A, Króliczewski J. Comparative studies on detergent-assisted apocytochrome b6 reconstitution into liposomal bilayers monitored by Zetasizer instruments. PLoS One 2014; 9:e111341. [PMID: 25423011 PMCID: PMC4244035 DOI: 10.1371/journal.pone.0111341] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2014] [Accepted: 10/01/2014] [Indexed: 11/19/2022] Open
Abstract
The present paper is a systematic, comparative study on the reconstitution of an apocytochrome b6 purified from a heterologous system using a detergent-free method and reconstitution into liposomes performed using three different detergents: SDS, Triton X-100 and DM, and two methods of detergent removal by dialysis and using Bio-Beads. The product size, its distribution and zeta potential, and other parameters were monitored throughout the process. We found that zeta potential of proteoliposomes is correlated with reconstitution efficiency and, as such, can serve as a quick and convenient quality control for reconstitution experiments. We also advocate using detergent-free protein purification methods as they allow for an unfettered choice of detergent for reconstitution, which is the most crucial factor influencing the final product parameters.
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Affiliation(s)
- Michał A. Surma
- Faculty of Biotechnology, University of Wroclaw, Wroclaw, Poland
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124
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Sun R, Liu K, Dong L, Wu Y, Paulsen H, Yang C. Direct energy transfer from the major antenna to the photosystem II core complexes in the absence of minor antennae in liposomes. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 2014; 1847:248-261. [PMID: 25461977 DOI: 10.1016/j.bbabio.2014.11.005] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/09/2014] [Revised: 11/13/2014] [Accepted: 11/18/2014] [Indexed: 10/24/2022]
Abstract
Minor antennae of photosystem (PS) II, located between the PSII core complex and the major antenna (LHCII), are important components for the structural and functional integrity of PSII supercomplexes. In order to study the functional significance of minor antennae in the energetic coupling between LHCII and the PSII core, characteristics of PSII-LHCII proteoliposomes, with or without minor antennae, were investigated. Two types of PSII preparations containing different antenna compositions were isolated from pea: 1) the PSII preparation composed of the PSII core complex, all of the minor antennae, and a small amount of major antennae (MCC); and 2) the purified PSII dimeric core complexes without periphery antenna (CC). They were incorporated, together with LHCII, into liposomes composed of thylakoid membrane lipids. The spectroscopic and functional characteristics were measured. 77K fluorescence emission spectra revealed an increased spectral weight of fluorescence from PSII reaction center in the CC-LHCII proteoliposomes, implying energetic coupling between LHCII and CC in the proteoliposomes lacking minor antennae. This result was further confirmed by chlorophyll a fluorescence induction kinetics. The incorporation of LHCII together with CC markedly increased the antenna cross-section of the PSII core complex. The 2,6-dichlorophenolindophenol photoreduction measurement implied that the lack of minor antennae in PSII supercomplexes did not block the energy transfer from LHCII to the PSII core complex. In conclusion, it is possible, in liposomes, that LHCII transfer energy directly to the PSII core complex, in the absence of minor antennae.
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Affiliation(s)
- Ruixue Sun
- Key Laboratory of Photobiology, Institute of Botany, Chinese Academy of Sciences, Nanxincun 20, Beijing 100093, China; University of Chinese Academy of Sciences, Yuquan Road 19A, Beijing 100049, China
| | - Kun Liu
- Key Laboratory of Photobiology, Institute of Botany, Chinese Academy of Sciences, Nanxincun 20, Beijing 100093, China
| | - Lianqing Dong
- Key Laboratory of Photobiology, Institute of Botany, Chinese Academy of Sciences, Nanxincun 20, Beijing 100093, China; University of Chinese Academy of Sciences, Yuquan Road 19A, Beijing 100049, China
| | - Yuling Wu
- Key Laboratory of Photobiology, Institute of Botany, Chinese Academy of Sciences, Nanxincun 20, Beijing 100093, China; University of Chinese Academy of Sciences, Yuquan Road 19A, Beijing 100049, China
| | - Harald Paulsen
- Institut für Allgemeine Botanik, Johannes-Gutenberg-Universität Mainz, Johannes-von-Müllerweg 6, 55099 Mainz, Germany
| | - Chunhong Yang
- Key Laboratory of Photobiology, Institute of Botany, Chinese Academy of Sciences, Nanxincun 20, Beijing 100093, China.
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125
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Haustein M, Schiller P, Wahab M, Mögel HJ. Computer Simulations of the Formation of Bile Salt Micelles and Bile Salt/DPPC Mixed Micelles in Aqueous Solutions. J SOLUTION CHEM 2014. [DOI: 10.1007/s10953-014-0239-3] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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126
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Brüggemann D, Frohnmayer JP, Spatz JP. Model systems for studying cell adhesion and biomimetic actin networks. BEILSTEIN JOURNAL OF NANOTECHNOLOGY 2014; 5:1193-202. [PMID: 25161853 PMCID: PMC4142981 DOI: 10.3762/bjnano.5.131] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/30/2014] [Accepted: 06/25/2014] [Indexed: 05/28/2023]
Abstract
Many cellular processes, such as migration, proliferation, wound healing and tumor progression are based on cell adhesion. Amongst different cell adhesion molecules, the integrin receptors play a very significant role. Over the past decades the function and signalling of various such integrins have been studied by incorporating the proteins into lipid membranes. These proteolipid structures lay the foundation for the development of artificial cells, which are able to adhere to substrates. To build biomimetic models for studying cell shape and spreading, actin networks can be incorporated into lipid vesicles, too. We here review the mechanisms of integrin-mediated cell adhesion and recent advances in the field of minimal cells towards synthetic adhesion. We focus on reconstituting integrins into lipid structures for mimicking cell adhesion and on the incorporation of actin networks and talin into model cells.
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Affiliation(s)
- Dorothea Brüggemann
- Department of New Materials and Biosystems, Max Planck Institute for Intelligent Systems, Heisenbergstr. 3, D-70569 Stuttgart, Germany
- Department of Biophysical Chemistry, University of Heidelberg, INF 253, D-69120 Heidelberg, Germany
| | - Johannes P Frohnmayer
- Department of New Materials and Biosystems, Max Planck Institute for Intelligent Systems, Heisenbergstr. 3, D-70569 Stuttgart, Germany
- Department of Biophysical Chemistry, University of Heidelberg, INF 253, D-69120 Heidelberg, Germany
| | - Joachim P Spatz
- Department of New Materials and Biosystems, Max Planck Institute for Intelligent Systems, Heisenbergstr. 3, D-70569 Stuttgart, Germany
- Department of Biophysical Chemistry, University of Heidelberg, INF 253, D-69120 Heidelberg, Germany
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127
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Nordlund G, Brzezinski P, von Ballmoos C. SNARE-fusion mediated insertion of membrane proteins into native and artificial membranes. Nat Commun 2014; 5:4303. [DOI: 10.1038/ncomms5303] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2014] [Accepted: 06/04/2014] [Indexed: 11/09/2022] Open
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128
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Kunert B, Gardiennet C, Lacabanne D, Calles-Garcia D, Falson P, Jault JM, Meier BH, Penin F, Böckmann A. Efficient and stable reconstitution of the ABC transporter BmrA for solid-state NMR studies. Front Mol Biosci 2014; 1:5. [PMID: 25988146 PMCID: PMC4428385 DOI: 10.3389/fmolb.2014.00005] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2014] [Accepted: 05/26/2014] [Indexed: 01/20/2023] Open
Abstract
We present solid-state NMR sample preparation and first 2D spectra of the Bacillus subtilis ATP-binding cassette (ABC) transporter BmrA, a membrane protein involved in multidrug resistance. The homodimeric 130-kDa protein is a challenge for structural characterization due to its membrane-bound nature, size, inherent flexibility and insolubility. We show that reconstitution of this protein in lipids from Bacillus subtilis at a lipid-protein ratio of 0.5 w/w allows for optimal protein insertion in lipid membranes with respect to two central NMR requirements, high signal-to-noise in the spectra and sample stability over a time period of months. The obtained spectra point to a well-folded protein and a highly homogenous preparation, as witnessed by the narrow resonance lines and the signal dispersion typical for the expected secondary structure distribution of BmrA. This opens the way for studies of the different conformational states of the transporter in the export cycle, as well as on interactions with substrates, via chemical-shift fingerprints and sequential resonance assignments.
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Affiliation(s)
- Britta Kunert
- Labex Ecofect, Bases Moleculaires et Structurales des Systemes Infectieux, UMR 5086 CNRS, IBCP, Université de Lyon 1Lyon, France
| | - Carole Gardiennet
- Labex Ecofect, Bases Moleculaires et Structurales des Systemes Infectieux, UMR 5086 CNRS, IBCP, Université de Lyon 1Lyon, France
| | - Denis Lacabanne
- Labex Ecofect, Bases Moleculaires et Structurales des Systemes Infectieux, UMR 5086 CNRS, IBCP, Université de Lyon 1Lyon, France
| | - Daniel Calles-Garcia
- Labex Ecofect, Bases Moleculaires et Structurales des Systemes Infectieux, UMR 5086 CNRS, IBCP, Université de Lyon 1Lyon, France
| | - Pierre Falson
- Labex Ecofect, Bases Moleculaires et Structurales des Systemes Infectieux, UMR 5086 CNRS, IBCP, Université de Lyon 1Lyon, France
| | - Jean-Michel Jault
- Labex Ecofect, Bases Moleculaires et Structurales des Systemes Infectieux, UMR 5086 CNRS, IBCP, Université de Lyon 1Lyon, France
| | | | - François Penin
- Labex Ecofect, Bases Moleculaires et Structurales des Systemes Infectieux, UMR 5086 CNRS, IBCP, Université de Lyon 1Lyon, France
| | - Anja Böckmann
- Labex Ecofect, Bases Moleculaires et Structurales des Systemes Infectieux, UMR 5086 CNRS, IBCP, Université de Lyon 1Lyon, France
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129
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Olguín Y, Carrascosa LG, Lechuga LM, Young M. The effects of lipids and surfactants on TLR5-proteoliposome functionality for flagellin detection using surface plasmon resonance biosensing. Talanta 2014; 126:136-44. [PMID: 24881544 DOI: 10.1016/j.talanta.2014.03.065] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2013] [Revised: 03/25/2014] [Accepted: 03/27/2014] [Indexed: 12/15/2022]
Abstract
The use of proteoliposomes as affinity elements in conjunction with a surface plasmon resonance sensor is a high-sensitivity alternative for the detection of multiple analytes. However, one of the most important aspects of these conformations is maintaining the functionality of the immobilized protein, which is determined by the choice of lipids and surfactants employed in the reconstitutions. Previously, we demonstrated the functionality of TLR5-proteoliposomes as screening affinity elements of bacterial flagellin. In this new study we change the conditions of immobilization of TLR5 and evaluate how the fluidity of the membrane and the final size of the liposomes affect the functionality of the construct and thus increase their utility as an affinity element for design of new biosensors. In particular, we used reconstructions into preformed liposomes composed of the lipids POPC, POPC-DMPC and POPC-POPE mediated by the use of surfactants OG, Triton X100, and DDM, respectively. The affinity results were evaluated by SPR technology proteoliposomes and were correlated with the anisotropic change in the membrane status; the final sizes of the proteoliposomes were estimated. Our results clearly show the dependence of fluidity and final size of the proteoliposomes with surface plasmon resonance affinity measurements.
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Affiliation(s)
- Y Olguín
- Biotechnology Center, Federico Santa Maria Technical University, Valparaíso, Chile.
| | - L G Carrascosa
- Nanobiosensor and Bioanalytical Applications Group, Institut Catàla de Nanociencia i Nanotecnología (ICN2), CSIC and CIBER-BBN, Bellaterra, Barcelona, Spain
| | - L M Lechuga
- Nanobiosensor and Bioanalytical Applications Group, Institut Catàla de Nanociencia i Nanotecnología (ICN2), CSIC and CIBER-BBN, Bellaterra, Barcelona, Spain
| | - M Young
- Biotechnology Center, Federico Santa Maria Technical University, Valparaíso, Chile
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130
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Growth of large and highly ordered 2D crystals of a K⁺ channel, structural role of lipidic environment. Biophys J 2014; 105:398-408. [PMID: 23870261 DOI: 10.1016/j.bpj.2013.05.054] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2012] [Revised: 05/18/2013] [Accepted: 05/29/2013] [Indexed: 02/04/2023] Open
Abstract
2D crystallography has proven to be an excellent technique to determine the 3D structure of membrane proteins. Compared to 3D crystallography, it has the advantage of visualizing the protein in an environment closer to the native one. However, producing good 2D crystals is still a challenge and little statistical knowledge can be gained from literature. Here, we present a thorough screening of 2D crystallization conditions for a prokaryotic inwardly rectifying potassium channel (>130 different conditions). Key parameters leading to very large and well-organized 2D crystals are discussed. In addition, the problem of formation of multilayers during the growth of 2D crystals is also addressed. An intermediate resolution projection map of KirBac3.1 at 6 Å is presented, which sheds (to our knowledge) new light on the structure of this channel in a lipid environment.
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131
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Wang L, Quan C, Liu B, Wang J, Xiong W, Zhao P, Fan S. Functional reconstitution of Staphylococcus aureus truncated AgrC histidine kinase in a model membrane system. PLoS One 2013; 8:e80400. [PMID: 24303011 PMCID: PMC3841183 DOI: 10.1371/journal.pone.0080400] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2013] [Accepted: 10/03/2013] [Indexed: 11/18/2022] Open
Abstract
The integral membrane protein AgrC is a histidine kinase whose sensor domains interact with an autoinducing peptide, resulting in a series of downstream responses. In this study, truncated AgrCTM5-6C and AgrCTM5-6C-GFP with GFP as a reporter gene were produced using a bacterial system. Purified AgrCTM5-6C and AgrCTM5-6C-GFP were reconstituted into liposomes by a detergent-mediated method. To achieve high-yield protein incorporation, we investigated the effect of different detergents on protein reconstitution efficiency. The highest incorporation was found with N,N-dimethyldode-cylamine N-oxide during complete liposome solubilization, which resulted in a yield of 85±5%. The COOH-terminus of the protein AgrCTM5-6C was almost exclusively oriented towards the inside of the vesicles. AgrCTM5-6C in proteoliposomes exhibited approximately a 6-fold increase in constitutive activity compared with AgrCTM5-6C in detergent micelles. The reconstitution of AgrCTM5-6C or AgrCTM5-6C-GFP was characterized using dynamic light scattering, fluorescence microscopy, and transmission electron microscopy. Based on the results, the optimal conditions for protein incorporation were defined. These findings contribute to the study of membrane protein structure and function in vitro using a reconstitution system.
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Affiliation(s)
- Lina Wang
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, China
| | - Chunshan Quan
- Department of Life Science, Dalian Nationalities University, Dalian, China
- The State Ethnic Affairs Commission-Ministry of Education, Dalian, China
- * E-mail:
| | - Baoquan Liu
- Department of Life Science, Dalian Nationalities University, Dalian, China
- The State Ethnic Affairs Commission-Ministry of Education, Dalian, China
| | - Jianfeng Wang
- Department of Life Science, Dalian Nationalities University, Dalian, China
- The State Ethnic Affairs Commission-Ministry of Education, Dalian, China
| | - Wen Xiong
- Department of Life Science, Dalian Nationalities University, Dalian, China
- The State Ethnic Affairs Commission-Ministry of Education, Dalian, China
| | - Pengchao Zhao
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, China
| | - Shengdi Fan
- Department of Life Science, Dalian Nationalities University, Dalian, China
- The State Ethnic Affairs Commission-Ministry of Education, Dalian, China
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132
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Malingriaux EA, Rupprecht A, Gille L, Jovanovic O, Jezek P, Jaburek M, Pohl EE. Fatty acids are key in 4-hydroxy-2-nonenal-mediated activation of uncoupling proteins 1 and 2. PLoS One 2013; 8:e77786. [PMID: 24204965 PMCID: PMC3810126 DOI: 10.1371/journal.pone.0077786] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2013] [Accepted: 09/12/2013] [Indexed: 11/19/2022] Open
Abstract
The production of reactive oxygen species (ROS) in mitochondria is very sensitive to the proton motive force and may be decreased by mild uncoupling, mediated e.g. by mitochondrial uncoupling proteins (UCPs). UCPs were conversely hypothesized to be activated by ROS. Conclusions from experiments studying the reactive product of lipid peroxidation 4-hydroxy-2-nonenal (HNE) in isolated mitochondria and UCP knock-out mice are highly controversial. Here we investigated the molecular mechanism of HNE action by evaluating the separate contributions of lipid and protein phases of the membrane and by comparing UCP1 and UCP2, which were reconstituted in planar lipid bilayers. We demonstrated that aldehyde does not directly activate either UCP1 or UCP2. However, HNE strongly potentiated the membrane conductance increase (Gm) mediated by different long-chain fatty acids in UCP-containing and in UCP-free membranes and this suggest the involvement of both lipid-mediated and protein-mediated mechanisms with FA playing the central role. Gm increase was concentration-dependent and exhibited a typical saturation kinetic with the binding constant 0.3 mM. By using Electron Paramagnetic Resonance, membrane fluidity change could be excluded as a cause for the HNE-mediated increase in the presence of FA. The impact of the HNE binding to definite positively charged UCP amino acid residues is discussed as a possible protein-mediated mechanism of the UCP activation.
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Affiliation(s)
- Elena A. Malingriaux
- Institute of Physiology, Pathophysiology and Biophysics, University of Veterinary Medicine, Vienna, Austria
| | - Anne Rupprecht
- Institute of Physiology, Pathophysiology and Biophysics, University of Veterinary Medicine, Vienna, Austria
| | - Lars Gille
- Institute of Pharmacology and Toxicology, University of Veterinary Medicine, Vienna, Austria
| | - Olga Jovanovic
- Institute of Physiology, Pathophysiology and Biophysics, University of Veterinary Medicine, Vienna, Austria
| | - Petr Jezek
- Institute of Physiology, Academy of Sciences of the Czech Republic, Prague, Czech Republic
| | - Martin Jaburek
- Institute of Physiology, Academy of Sciences of the Czech Republic, Prague, Czech Republic
| | - Elena E. Pohl
- Institute of Physiology, Pathophysiology and Biophysics, University of Veterinary Medicine, Vienna, Austria
- * E-mail:
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133
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Das N, Murray DT, Cross TA. Lipid bilayer preparations of membrane proteins for oriented and magic-angle spinning solid-state NMR samples. Nat Protoc 2013; 8:2256-70. [PMID: 24157546 DOI: 10.1038/nprot.2013.129] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Solid-state NMR spectroscopy has been used successfully for characterizing the structure and dynamics of membrane proteins as well as their interactions with other proteins in lipid bilayers. Such an environment is often necessary for achieving native-like structures. Sample preparation is the key to this success. Here we present a detailed description of a robust protocol that results in high-quality membrane protein samples for both magic-angle spinning and oriented-sample solid-state NMR. The procedure is demonstrated using two proteins: CrgA (two transmembrane helices) and Rv1861 (three transmembrane helices), both from Mycobacterium tuberculosis. The success of this procedure relies on two points. First, for samples for both types of NMR experiment, the reconstitution of the protein from a detergent environment to an environment in which it is incorporated into liposomes results in 'complete' removal of detergent. Second, for the oriented samples, proper dehydration followed by rehydration of the proteoliposomes is essential. By using this protocol, proteoliposome samples for magic-angle spinning NMR and uniformly aligned samples (orientational mosaicity of <1°) for oriented-sample NMR can be obtained within 10 d.
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Affiliation(s)
- Nabanita Das
- 1] Institute of Molecular Biophysics (IMB), Florida State University (FSU), Tallahassee, Florida, USA. [2] National High Magnetic Field Laboratory (NMHFL), FSU, Tallahassee, Florida, USA
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134
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Liu YJ, Hansen GPR, Venancio-Marques A, Baigl D. Cell-free preparation of functional and triggerable giant proteoliposomes. Chembiochem 2013; 14:2243-7. [PMID: 24115581 DOI: 10.1002/cbic.201300501] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2013] [Indexed: 01/15/2023]
Abstract
Heat, we leak: We express a membrane protein outside well-defined giant liposomes obtained by gravity-transferred sucrose-in-oil droplets into a cell-free, reconstituted expression system. We show that the presence of the liposome is necessary during expression for efficient protein insertion into the membrane and that temperature can trigger the resulting membrane function.
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Affiliation(s)
- Yan-Jun Liu
- Department of Chemistry, Ecole Normale Superieure, 24 rue Lhomond, 75005 Paris (France) http://www.baigllab.com/; Université Pierre et Marie Curie Paris 6, 4 place Jussieu, 75005 Paris (France); UMR 8640, CNRS, 3 rue Michel-Ange, 75016 Paris (France)
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135
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Koeda S, Umezaki K, Sumino A, Noji T, Ikeda A, Yamamoto Y, Dewa T, Taga K, Nango M, Tanaka T, Mizuno T. Creation of cross-linked bilayer membranes that can incorporate membrane proteins from oligo-Asp-based peptide gemini surfactants. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:11695-11704. [PMID: 23944736 DOI: 10.1021/la401566h] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
We designed novel bilayer-forming amphiphiles based on the cyclic oligo-Asp-based peptide gemini (PG) surfactants cr-D2C12 and cr-D3C12, which consist of -Cys(Asp)nCys- (n = 2 or 3) as a core peptide and two Cys residues containing a dodecylamidomethyl group. Dynamic light scattering and transmission electron microscopy measurements revealed the formation of spherical bilayer membranes that could incorporate the light-harvesting antenna complex 2 (LH2) from Rhodopseudomonas acidophila . Furthermore, this proteoliposome-like conjugate could be assembled onto cationized glass and mica to form planar bilayer membranes incorporating LH2. Using atomic force microscopy, we observed LH2 protruding (ca. 1.2-1.5 nm) from flat terraces of the planar bilayer membranes formed from cr-D2C12 or cr-D3C12. Thus, our designed PG surfactants are a new class of bilayer-forming amphiphiles that may be applied to the study of various membrane proteins.
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Affiliation(s)
- Shuhei Koeda
- Graduate School of Engineering, Nagoya Institute of Technology , Gokiso-cho, Showa-ku, Nagoya, Aichi 466-8555, Japan
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136
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Simeonov P, Werner S, Haupt C, Tanabe M, Bacia K. Membrane protein reconstitution into liposomes guided by dual-color fluorescence cross-correlation spectroscopy. Biophys Chem 2013; 184:37-43. [PMID: 24050929 DOI: 10.1016/j.bpc.2013.08.003] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2013] [Revised: 08/08/2013] [Accepted: 08/09/2013] [Indexed: 10/26/2022]
Abstract
Proteoliposomes represent nanoscale assemblies of indispensable value for studying membrane proteins in general and membrane transporters in particular. Since no universal protocol exists, conditions for proteoliposome formation must be determined on a case-by-case basis. This process will be significantly expedited if the size and composition of the assemblies can be analyzed in a single step using only microliters of sample. Here we show that dual-color fluorescence cross-correlation spectroscopy (FCCS) is of great value for optimizing the reconstitution process, because it distinguishes micelles, liposomes and aggregates in heterogeneous mixtures and permits direct monitoring of the co-localization of proteins and lipids in the diffusing assemblies. As proof-of-principle, liposomes containing the functional multidrug resistance transporter NorA from Staphylococcus aureus were prepared, demonstrating that FCCS is an excellent tool to guide the development of reconstitution protocols.
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Affiliation(s)
- Peter Simeonov
- Membrane Protein Biochemistry, HALOmem, University of Halle, Kurt-Mothes-Str. 3, D-06120 Halle (Saale), Germany
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137
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Puthenveetil R, Vinogradova O. Optimization of the design and preparation of nanoscale phospholipid bilayers for its application to solution NMR. Proteins 2013; 81:1222-31. [PMID: 23436707 PMCID: PMC5051544 DOI: 10.1002/prot.24271] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2012] [Revised: 01/23/2013] [Accepted: 02/06/2013] [Indexed: 12/15/2022]
Abstract
Despite arduous efforts and recent technological developments structural investigation of integral membrane proteins remains a challenge. The primary deterrents include difficulties with their expression, low inherent solubility, and problems associated with existing membrane mimicking systems. A relatively new class of membrane mimetics, nanodiscs, is emerging as a promising alternative. Although nanodiscs have been proven successful for several biophysical applications, they yet remain to become the system of preferred choice for structure determination. We have hereby made nanodiscs more suitable for solution NMR applications by reducing the diameter of the self-assembly complex to its potential limit. We achieved a noticeable improvement in the quality of NMR spectra obtained for the transmembrane and cytoplasmic domains of integrin αIIb incorporated into these smaller discs rendering them susceptible for a thorough structural investigation. In addition, we also present an on-column method for a rapid, efficient, single-step preparation of protein incorporated nanodiscs at high concentrations. These discs have been fully characterized by transmission electron microscopy, dynamic light scattering, and differential scanning calorimetry.
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Affiliation(s)
| | - Olga Vinogradova
- Department of Pharmaceutical Sciences, School of Pharmacy, University of Connecticut, Storrs, CT
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138
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Resveratrol modulates ATPase activity of liposome-reconstituted ABCG1. FEBS Lett 2013; 587:2359-63. [DOI: 10.1016/j.febslet.2013.06.001] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2013] [Accepted: 06/04/2013] [Indexed: 12/16/2022]
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139
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Chen C, Jiang C, Tripp CP. Molecular dynamics of the interaction of anionic surfactants with liposomes. Colloids Surf B Biointerfaces 2013; 105:173-9. [DOI: 10.1016/j.colsurfb.2012.12.045] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2012] [Revised: 11/26/2012] [Accepted: 12/19/2012] [Indexed: 11/28/2022]
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140
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Detergent-mediated incorporation of transmembrane proteins in giant unilamellar vesicles with controlled physiological contents. Proc Natl Acad Sci U S A 2013; 110:7276-81. [PMID: 23589883 DOI: 10.1073/pnas.1303857110] [Citation(s) in RCA: 104] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Giant unilamellar vesicles (GUVs) are convenient biomimetic systems of the same size as cells that are increasingly used to quantitatively address biophysical and biochemical processes related to cell functions. However, current approaches to incorporate transmembrane proteins in the membrane of GUVs are limited by the amphiphilic nature or proteins. Here, we report a method to incorporate transmembrane proteins in GUVs, based on concepts developed for detergent-mediated reconstitution in large unilamellar vesicles. Reconstitution is performed either by direct incorporation from proteins purified in detergent micelles or by fusion of purified native vesicles or proteoliposomes in preformed GUVs. Lipid compositions of the membrane and the ionic, protein, or DNA compositions in the internal and external volumes of GUVs can be controlled. Using confocal microscopy and functional assays, we show that proteins are unidirectionally incorporated in the GUVs and keep their functionality. We have successfully tested our method with three types of transmembrane proteins. GUVs containing bacteriorhodopsin, a photoactivable proton pump, can generate large transmembrane pH and potential gradients that are light-switchable and stable for hours. GUVs with FhuA, a bacterial porin, were used to follow the DNA injection by T5 phage upon binding to its transmembrane receptor. GUVs incorporating BmrC/BmrD, a bacterial heterodimeric ATP-binding cassette efflux transporter, were used to demonstrate the protein-dependent translocation of drugs and their interactions with encapsulated DNA. Our method should thus apply to a wide variety of membrane or peripheral proteins for producing more complex biomimetic GUVs.
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141
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Mörs K, Roos C, Scholz F, Wachtveitl J, Dötsch V, Bernhard F, Glaubitz C. Modified lipid and protein dynamics in nanodiscs. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2013; 1828:1222-9. [DOI: 10.1016/j.bbamem.2012.12.011] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/18/2012] [Revised: 12/04/2012] [Accepted: 12/11/2012] [Indexed: 02/09/2023]
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142
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Abstract
Liposome structures have a wide range of applications in biology, biochemistry, and biophysics. As a result, several methods for forming liposomes have been developed. This review provides a critical comparison of existing microfluidic technologies for forming liposomes and, when applicable, a comparison with their analogous macroscale counterparts. The properties of the generated liposomes, including size, size distribution, lamellarity, membrane composition, and encapsulation efficiency, form the basis for comparison. We hope that this critique will allow the reader to make an informed decision as to which method should be used for a given biological application.
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Affiliation(s)
- Dirk van Swaay
- Institute for Chemical and Bioengineering, ETH Zurich, Zurich, Switzerland
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143
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Zhu R, Rupprecht A, Ebner A, Haselgrübler T, Gruber HJ, Hinterdorfer P, Pohl EE. Mapping the nucleotide binding site of uncoupling protein 1 using atomic force microscopy. J Am Chem Soc 2013; 135:3640-6. [PMID: 23414455 PMCID: PMC3593612 DOI: 10.1021/ja312550k] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
![]()
A tight regulation of proton transport
in the inner mitochondrial
membrane is crucial for physiological processes such as ATP synthesis,
heat production, or regulation of the reactive oxygen species as proposed
for the uncoupling protein family members (UCP). Specific regulation
of proton transport is thus becoming increasingly important in the
therapy of obesity and inflammatory, neurodegenerative, and ischemic
diseases. We and other research groups have shown previously that
UCP1- and UCP2-mediated proton transport is inhibited by purine nucleotides.
Several hypotheses have been proposed to explain the inhibitory effect
of ATP, although structural details are still lacking. Moreover, the
unresolved mystery is how UCP operates in vivo despite the permanent
presence of high (millimolar) concentrations of ATP in mitochondria.
Here we use the topographic and recognition (TREC) mode of an atomic
force microscope to visualize UCP1 reconstituted into lipid bilayers
and to analyze the ATP–protein interaction at a single molecule
level. The comparison of recognition patterns obtained with anti-UCP1
antibody and ATP led to the conclusion that the ATP binding site can
be accessed from both sides of the membrane. Using cantilever tips
with different cross-linker lengths, we determined the location of
the nucleotide binding site inside the membrane with 1 Å precision.
Together with the recently published NMR structure of a UCP family
member (Berardi et al. Nature, 2011, 476, 109–113), our data
provide a valuable insight into the mechanism of the nucleotide binding
and pave the way for new pharmacological approaches against the diseases
mentioned above.
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Affiliation(s)
- Rong Zhu
- Institute for Biophysics, Johannes Kepler University, Linz, Austria
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144
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Levy D, Milhiet PE. Imaging of transmembrane proteins directly incorporated within supported lipid bilayers using atomic force microscopy. Methods Mol Biol 2013; 950:343-357. [PMID: 23086884 DOI: 10.1007/978-1-62703-137-0_19] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Structural analysis of transmembrane proteins remains a challenge in biology, mainly due to their difficulty in being overexpressed and the required use of detergents that impair different steps of biochemistry classically used to obtain 3D crystals. In this context, we have developed a new technique for protein incorporation within supported lipid bilayers that only requires a few picomoles of protein per assay. Proteins are directly inserted into a detergent-destabilized bilayer that can be imaged in buffer with atomic force microscopy (AFM) allowing structural analysis down to sub-nanometer lateral resolution. In this chapter, we describe the main guidelines for this technique, from the choice of detergent to the requirements for AFM high-resolution imaging.
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145
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Development of a proteoliposome model to probe transmembrane electron-transfer reactions. Biochem Soc Trans 2012; 40:1257-60. [DOI: 10.1042/bst20120116] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The mineral-respiring bacterium Shewanella oneidensis uses a protein complex, MtrCAB, composed of two decahaem cytochromes brought together inside a transmembrane porin to transport electrons across the outer membrane to a variety of mineral-based electron acceptors. A proteoliposome system has been developed that contains Methyl Viologen as an internalized electron carrier and valinomycin as a membrane-associated cation exchanger. These proteoliposomes can be used as a model system to investigate MtrCAB function.
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146
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Ohlsson G, Tabaei SR, Beech J, Kvassman J, Johanson U, Kjellbom P, Tegenfeldt JO, Höök F. Solute transport on the sub 100 ms scale across the lipid bilayer membrane of individual proteoliposomes. LAB ON A CHIP 2012; 12:4635-4643. [PMID: 22895529 DOI: 10.1039/c2lc40518k] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Screening assays designed to probe ligand and drug-candidate regulation of membrane proteins responsible for ion-translocation across the cell membrane are wide spread, while efficient means to screen membrane-protein facilitated transport of uncharged solutes are sparse. We report on a microfluidic-based system to monitor transport of uncharged solutes across the membrane of multiple (>100) individually resolved surface-immobilized liposomes. This was accomplished by rapidly switching (<10 ms) the solution above dye-containing liposomes immobilized on the floor of a microfluidic channel. With liposomes encapsulating the pH-sensitive dye carboxyfluorescein (CF), internal changes in pH induced by transport of a weak acid (acetic acid) could be measured at time scales down to 25 ms. The applicability of the set up to study biological transport reactions was demonstrated by examining the osmotic water permeability of human aquaporin (AQP5) reconstituted in proteoliposomes. In this case, the rate of osmotic-induced volume changes of individual proteoliposomes was time resolved by imaging the self quenching of encapsulated calcein in response to an osmotic gradient. Single-liposome analysis of both pure and AQP5-containing liposomes revealed a relatively large heterogeneity in osmotic permeability. Still, in the case of AQP5-containing liposomes, the single liposome data suggest that the membrane-protein incorporation efficiency depends on liposome size, with higher incorporation efficiency for larger liposomes. The benefit of low sample consumption and automated liquid handling is discussed in terms of pharmaceutical screening applications.
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Affiliation(s)
- Gabriel Ohlsson
- Department of Applied Physics, Chalmers University of Technology, Gothenburg, Sweden
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147
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Doumiati S, Haupt K, Rossi C. Autophosphorylation activation and inhibition by curcumin of the epidermal growth factor receptor reconstituted in liposomes. J Mol Recognit 2012; 25:623-9. [DOI: 10.1002/jmr.2194] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Samah Doumiati
- UMR 6022 CNRS; Université de Technologie de Compiègne; BP 20529, 60205; Compiègne Cedex; France
| | - Karsten Haupt
- UMR 6022 CNRS; Université de Technologie de Compiègne; BP 20529, 60205; Compiègne Cedex; France
| | - Claire Rossi
- UMR 6022 CNRS; Université de Technologie de Compiègne; BP 20529, 60205; Compiègne Cedex; France
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148
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Roberts PG, Hirst J. The deactive form of respiratory complex I from mammalian mitochondria is a Na+/H+ antiporter. J Biol Chem 2012; 287:34743-51. [PMID: 22854968 PMCID: PMC3464577 DOI: 10.1074/jbc.m112.384560] [Citation(s) in RCA: 64] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2012] [Revised: 07/23/2012] [Indexed: 11/21/2022] Open
Abstract
In mitochondria, complex I (NADH:ubiquinone oxidoreductase) uses the redox potential energy from NADH oxidation by ubiquinone to transport protons across the inner membrane, contributing to the proton-motive force. However, in some prokaryotes, complex I may transport sodium ions instead, and three subunits in the membrane domain of complex I are closely related to subunits from the Mrp family of Na(+)/H(+) antiporters. Here, we define the relationship between complex I from Bos taurus heart mitochondria, a close model for the human enzyme, and sodium ion transport across the mitochondrial inner membrane. In accord with current consensus, we exclude the possibility of redox-coupled Na(+) transport by B. taurus complex I. Instead, we show that the "deactive" form of complex I, which is formed spontaneously when enzyme turnover is precluded by lack of substrates, is a Na(+)/H(+) antiporter. The antiporter activity is abolished upon reactivation by the addition of substrates and by the complex I inhibitor rotenone. It is specific for Na(+) over K(+), and it is not exhibited by complex I from the yeast Yarrowia lipolytica, which thus has a less extensive deactive transition. We propose that the functional connection between the redox and transporter modules of complex I is broken in the deactive state, allowing the transport module to assert its independent properties. The deactive state of complex I is formed during hypoxia, when respiratory chain turnover is slowed, and may contribute to determining the outcome of ischemia-reperfusion injury.
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Affiliation(s)
- Philippa G. Roberts
- From The Medical Research Council Mitochondrial Biology Unit, Wellcome Trust/MRC Building, Hills Road, Cambridge CB2 0XY, United Kingdom
| | - Judy Hirst
- From The Medical Research Council Mitochondrial Biology Unit, Wellcome Trust/MRC Building, Hills Road, Cambridge CB2 0XY, United Kingdom
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149
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Hassanzadeh A, Ma HK, Dixon SJ, Mittler S. Visualization of the solubilization process of the plasma membrane of a living cell by waveguide evanescent field fluorescence microscopy. JOURNAL OF BIOMEDICAL OPTICS 2012; 17:076025. [PMID: 22894508 DOI: 10.1117/1.jbo.17.7.076025] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Waveguide evanescent field fluorescence microscopy (WEFF) is a novel microscopy technology that allows imaging of a cell's plasma membrane in the vicinity of a glass substrate with high axial resolution, low background and little photobleaching. Time-lapse imaging can be performed to investigate changes in cell morphology in the presence or absence of chemical agents. WEFF microscopy provides a method to investigate plasma membranes of living cells and allows a comparison to simplified model membranes immobilized on planar substrates. The interaction of the nonionic detergent Triton X-100 with plasma membranes of osteoblasts in an aqueous environment was investigated. Solubilization of the membranes very close to the waveguide surface was visualized and related to the three-stage solubilisation model proposed for liposomes and supported lipid bilayers. Findings for the plasma membranes of cells are in excellent agreement with results reported for these artificial model systems.
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Affiliation(s)
- Abdollah Hassanzadeh
- Western University, London, Department of Physics and Astronomy, Ontario, Canada
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150
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Hernandez JM, Stein A, Behrmann E, Riedel D, Cypionka A, Farsi Z, Walla PJ, Raunser S, Jahn R. Membrane fusion intermediates via directional and full assembly of the SNARE complex. Science 2012; 336:1581-4. [PMID: 22653732 PMCID: PMC3677693 DOI: 10.1126/science.1221976] [Citation(s) in RCA: 172] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Cellular membrane fusion is thought to proceed through intermediates including docking of apposed lipid bilayers, merging of proximal leaflets to form a hemifusion diaphragm, and fusion pore opening. A membrane-bridging four-helix complex of soluble N-ethylmaleimide-sensitive factor attachment protein receptors (SNAREs) mediates fusion. However, how assembly of the SNARE complex generates docking and other fusion intermediates is unknown. Using a cell-free reaction, we identified intermediates visually and then arrested the SNARE fusion machinery when fusion was about to begin. Partial and directional assembly of SNAREs tightly docked bilayers, but efficient fusion and an extended form of hemifusion required assembly beyond the core complex to the membrane-connecting linkers. We propose that straining of lipids at the edges of an extended docking zone initiates fusion.
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Affiliation(s)
- Javier M. Hernandez
- Department of Neurobiology, Max Planck Institute for Biophysical Chemistry, Am Fassberg 11, 37077 Göttingen, Germany
| | - Alexander Stein
- Department of Neurobiology, Max Planck Institute for Biophysical Chemistry, Am Fassberg 11, 37077 Göttingen, Germany
| | - Elmar Behrmann
- Department of Physical Biochemistry, Max Planck Institute of Molecular Physiology, Otto-Hahn-Str. 11, 44227 Dortmund, Germany
| | - Dietmar Riedel
- Department of Neurobiology, Max Planck Institute for Biophysical Chemistry, Am Fassberg 11, 37077 Göttingen, Germany
| | - Anna Cypionka
- Department of Neurobiology, Max Planck Institute for Biophysical Chemistry, Am Fassberg 11, 37077 Göttingen, Germany
- AG Biomolecular Spectroscopy and Single-Molecule Detection, Max Planck Institute for Biophysical Chemistry, Am Fassberg 11, 37077 Göttingen, Germany
| | - Zohreh Farsi
- Department of Neurobiology, Max Planck Institute for Biophysical Chemistry, Am Fassberg 11, 37077 Göttingen, Germany
| | - Peter J. Walla
- AG Biomolecular Spectroscopy and Single-Molecule Detection, Max Planck Institute for Biophysical Chemistry, Am Fassberg 11, 37077 Göttingen, Germany
- Department of Biophysical Chemistry, Institute for Physical and Theoretical Chemistry, Technical University of Braunschweig, Hans-Sommer-Str. 10, 38106 Braunschweig, Germany
| | - Stefan Raunser
- Department of Physical Biochemistry, Max Planck Institute of Molecular Physiology, Otto-Hahn-Str. 11, 44227 Dortmund, Germany
| | - Reinhard Jahn
- Department of Neurobiology, Max Planck Institute for Biophysical Chemistry, Am Fassberg 11, 37077 Göttingen, Germany
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