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Taguchi S, Okamoto Y, Suga K, Jung HS, Umakoshi H. Preparation of Planar Lipid Bilayer Membrane by Utilizing Bicelles and Its Characterization. KAGAKU KOGAKU RONBUN 2022. [DOI: 10.1252/kakoronbunshu.48.175] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Shogo Taguchi
- Department of Chemical Engineering and Materials Science, Graduate School of Engineering, University of Hyogo
| | - Yukihiro Okamoto
- Division of Chemical Engineering, Graduate School of Engineering Science, Osaka University
| | - Keishi Suga
- Department of Chemical Engineering, Tohoku University
| | - Ho-Sup Jung
- Center for Food and Bioconvergence, Department of Food Science and Biotechnology, Seoul National University
| | - Hiroshi Umakoshi
- Division of Chemical Engineering, Graduate School of Engineering Science, Osaka University
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2
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Farrelly MD, Martin LL, Thang SH. Polymer Nanodiscs and Their Bioanalytical Potential. Chemistry 2021; 27:12922-12939. [PMID: 34180107 DOI: 10.1002/chem.202101572] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2021] [Indexed: 12/21/2022]
Abstract
Membrane proteins (MPs) play a pivotal role in cellular function and are therefore predominant pharmaceutical targets. Although detailed understanding of MP structure and mechanistic activity is invaluable for rational drug design, challenges are associated with the purification and study of MPs. This review delves into the historical developments that became the prelude to currently available membrane mimetic technologies before shining a spotlight on polymer nanodiscs. These are soluble nanosized particles capable of encompassing MPs embedded in a phospholipid ring. The expanding range of reported amphipathic polymer nanodisc materials is presented and discussed in terms of their tolerance to different solution conditions and their nanodisc properties. Finally, the analytical scope of polymer nanodiscs is considered in both the demonstration of basic nanodisc parameters as well as in the elucidation of structures, lipid-protein interactions, and the functional mechanisms of reconstituted membrane proteins. The final emphasis is given to the unique benefits and applications demonstrated for native nanodiscs accessed through a detergent free process.
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Affiliation(s)
| | - Lisandra L Martin
- School of Chemistry, Monash University, Clayton, 3800, Vic, Australia
| | - San H Thang
- School of Chemistry, Monash University, Clayton, 3800, Vic, Australia
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3
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Caldwell TA, Baoukina S, Brock AT, Oliver RC, Root KT, Krueger JK, Glover KJ, Tieleman DP, Columbus L. Low- q Bicelles Are Mixed Micelles. J Phys Chem Lett 2018; 9:4469-4473. [PMID: 30024762 PMCID: PMC6353637 DOI: 10.1021/acs.jpclett.8b02079] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Bicelles are used in many membrane protein studies because they are thought to be more bilayer-like than micelles. We investigated the properties of "isotropic" bicelles by small-angle neutron scattering, small-angle X-ray scattering, fluorescence anisotropy, and molecular dynamics. All data suggest that bicelles with a q value below 1 deviate from the classic bicelle that contains lipids in the core and detergent in the rim. Thus not all isotropic bicelles are bilayer-like.
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Affiliation(s)
- Tracy A. Caldwell
- Department of Chemistry, University of Virginia, Charlottesville, Virginia 22904, United States
| | - Svetlana Baoukina
- Department of Biological Sciences and Centre for Molecular Simulation, University of Calgary, Calgary, Alberta T2N 1N4, Canada
| | - Ashton T. Brock
- Department of Chemistry, University of Virginia, Charlottesville, Virginia 22904, United States
| | - Ryan C. Oliver
- Department of Chemistry, University of Virginia, Charlottesville, Virginia 22904, United States
| | - Kyle T. Root
- Department of Chemistry, Lock Haven University, Lock Haven, Pennsylvania 17745, United States
| | - Joanna K. Krueger
- Department of Chemistry, The University of North Carolina at Charlotte, Charlotte, North Carolina 28223, United States
| | - Kerney Jebrell Glover
- Department of Chemistry, Lehigh University, Bethlehem, Pennsylvania 18015, United States
| | - D. Peter Tieleman
- Department of Biological Sciences and Centre for Molecular Simulation, University of Calgary, Calgary, Alberta T2N 1N4, Canada
| | - Linda Columbus
- Department of Chemistry, University of Virginia, Charlottesville, Virginia 22904, United States
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4
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Impact of membrane curvature on amyloid aggregation. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2018; 1860:1741-1764. [PMID: 29709613 DOI: 10.1016/j.bbamem.2018.04.012] [Citation(s) in RCA: 74] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/05/2018] [Revised: 04/23/2018] [Accepted: 04/25/2018] [Indexed: 12/11/2022]
Abstract
The misfolding, amyloid aggregation, and fibril formation of intrinsically disordered proteins/peptides (or amyloid proteins) have been shown to cause a number of disorders. The underlying mechanisms of amyloid fibrillation and structural properties of amyloidogenic precursors, intermediates, and amyloid fibrils have been elucidated in detail; however, in-depth examinations on physiologically relevant contributing factors that induce amyloidogenesis and lead to cell death remain challenging. A large number of studies have attempted to characterize the roles of biomembranes on protein aggregation and membrane-mediated cell death by designing various membrane components, such as gangliosides, cholesterol, and other lipid compositions, and by using various membrane mimetics, including liposomes, bicelles, and different types of lipid-nanodiscs. We herein review the dynamic effects of membrane curvature on amyloid generation and the inhibition of amyloidogenic proteins and peptides, and also discuss how amyloid formation affects membrane curvature and integrity, which are key for understanding relationships with cell death. Small unilamellar vesicles with high curvature and large unilamellar vesicles with low curvature have been demonstrated to exhibit different capabilities to induce the nucleation, amyloid formation, and inhibition of amyloid-β peptides and α-synuclein. Polymorphic amyloidogenesis in small unilamellar vesicles was revealed and may be viewed as one of the generic properties of interprotein interaction-dominated amyloid formation. Several mechanical models and phase diagrams are comprehensively shown to better explain experimental findings. The negative membrane curvature-mediated mechanisms responsible for the toxicity of pancreatic β cells by the amyloid aggregation of human islet amyloid polypeptide (IAPP) and binding of the precursors of the semen-derived enhancer of viral infection (SEVI) are also described. The curvature-dependent binding modes of several types of islet amyloid polypeptides with high-resolution NMR structures are also discussed.
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5
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Leninger M, Traaseth NJ. NMR Spectroscopy Approach to Study the Structure, Orientation, and Mechanism of the Multidrug Exporter EmrE. Methods Mol Biol 2018; 1700:83-96. [PMID: 29177827 PMCID: PMC5926179 DOI: 10.1007/978-1-4939-7454-2_6] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
Multidrug exporters are a class of membrane proteins that remove antibiotics from the cytoplasm of bacteria and in the process confer multidrug resistance to the organism. This chapter outlines the sample preparation and optimization of oriented solid-state NMR experiments applied to the study of structure and dynamics for the model transporter EmrE from the small multidrug resistance (SMR) family.
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Affiliation(s)
- Maureen Leninger
- Department of Chemistry, New York University, 100 Washington Square East, New York, NY, 10003, USA
| | - Nathaniel J Traaseth
- Department of Chemistry, New York University, 100 Washington Square East, New York, NY, 10003, USA.
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6
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Smrt ST, Draney AW, Singaram I, Lorieau JL. Structure and Dynamics of Membrane Proteins and Membrane Associated Proteins with Native Bicelles from Eukaryotic Tissues. Biochemistry 2017; 56:5318-5327. [PMID: 28915027 DOI: 10.1021/acs.biochem.7b00575] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Affiliation(s)
- Sean T. Smrt
- Department of Chemistry, University of Illinois at Chicago, 845 West Taylor Street, Chicago, Illinois 60607, United States
| | - Adrian W. Draney
- Department of Chemistry, University of Illinois at Chicago, 845 West Taylor Street, Chicago, Illinois 60607, United States
| | - Indira Singaram
- Department of Chemistry, University of Illinois at Chicago, 845 West Taylor Street, Chicago, Illinois 60607, United States
| | - Justin L. Lorieau
- Department of Chemistry, University of Illinois at Chicago, 845 West Taylor Street, Chicago, Illinois 60607, United States
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7
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Yamamoto K, Caporini MA, Im SC, Waskell L, Ramamoorthy A. Transmembrane Interactions of Full-length Mammalian Bitopic Cytochrome-P450-Cytochrome-b 5 Complex in Lipid Bilayers Revealed by Sensitivity-Enhanced Dynamic Nuclear Polarization Solid-state NMR Spectroscopy. Sci Rep 2017; 7:4116. [PMID: 28646173 PMCID: PMC5482851 DOI: 10.1038/s41598-017-04219-1] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2017] [Accepted: 05/11/2017] [Indexed: 01/12/2023] Open
Abstract
The dynamic protein-protein and protein-ligand interactions of integral bitopic membrane proteins with a single membrane-spanning helix play a plethora of vital roles in the cellular processes associated with human health and diseases, including signaling and enzymatic catalysis. While an increasing number of high-resolution structural studies of membrane proteins have successfully manifested an in-depth understanding of their biological functions, intact membrane-bound bitopic protein-protein complexes pose tremendous challenges for structural studies by crystallography or solution NMR spectroscopy. Therefore, there is a growing interest in developing approaches to investigate the functional interactions of bitopic membrane proteins embedded in lipid bilayers at atomic-level. Here we demonstrate the feasibility of dynamic nuclear polarization (DNP) magic-angle-spinning NMR techniques, along with a judiciously designed stable isotope labeling scheme, to measure atomistic-resolution transmembrane-transmembrane interactions of full-length mammalian ~72-kDa cytochrome P450-cytochrome b5 complex in lipid bilayers. Additionally, the DNP sensitivity-enhanced two-dimensional 13C/13C chemical shift correlations via proton driven spin diffusion provided distance constraints to characterize protein-lipid interactions and revealed the transmembrane topology of cytochrome b5. The results reported in this study would pave ways for high-resolution structural and topological investigations of membrane-bound full-length bitopic protein complexes under physiological conditions.
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Affiliation(s)
- Kazutoshi Yamamoto
- Biophysics and Department of Chemistry, University of Michigan, Ann Arbor, MI, 48109-1055, USA
| | - Marc A Caporini
- Bruker Biospin Corporation, 15 Fortune Drive, Billerica, MA, 01821, USA
| | - Sang-Choul Im
- Department of Anesthesiology, VA Medical Center, University of Michigan, Ann Arbor, MI, 48105, USA
| | - Lucy Waskell
- Department of Anesthesiology, VA Medical Center, University of Michigan, Ann Arbor, MI, 48105, USA
| | - Ayyalusamy Ramamoorthy
- Biophysics and Department of Chemistry, University of Michigan, Ann Arbor, MI, 48109-1055, USA.
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8
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Beaugrand M, Arnold AA, Juneau A, Gambaro AB, Warschawski DE, Williamson PTF, Marcotte I. Magnetically Oriented Bicelles with Monoalkylphosphocholines: Versatile Membrane Mimetics for Nuclear Magnetic Resonance Applications. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:13244-13251. [PMID: 27951690 DOI: 10.1021/acs.langmuir.6b03099] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Bicelles (bilayered micelles) are model membranes used in the study of peptide structure and membrane interactions. They are traditionally made of long- and short-chain phospholipids, usually dimyristoylphosphatidylcholine (D14PC) and dihexanoyl-PC (D6PC). They are attractive membrane mimetics because their composition and planar surface are similar to the native membrane environment. In this work, to improve the solubilization of membrane proteins and allow their study in bicellar systems, D6PC was replaced by detergents from the monoalkylphosphocholine (MAPCHO) family, of which dodecylphosphocholine (12PC) is known for its ability to solubilize membrane proteins. More specifically 12PC, tetradecyl- (14PC), and hexadecyl-PC (16PC) have been employed. To verify the possibility of making bicelles with different hydrophobic thicknesses to better accommodate membrane proteins, D14PC was also replaced by phospholipids with different alkyl chain lengths: dilauroyl-PC (D12PC), dipalmitoyl-PC (D16PC), distearoyl-PC (D18PC), and diarachidoyl-PC (D20PC). Results obtained by 31P solid-state nuclear magnetic resonance (NMR) and isothermal titration calorimetry (ITC) at several lipid-to-detergent molar ratios (q) and temperatures indicate that these new MAPCHO bicelles can be formed under a variety of conditions. The quality of their alignment is similar to that of classical bicelles, and the low critical micelle concentration (CMC) of the surfactants and their miscibility with phospholipids are likely to be advantageous for the reconstitution of membrane proteins.
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Affiliation(s)
- Maïwenn Beaugrand
- Département de Chimie, Université du Québec à Montréal , P.O. Box 8888, Downtown Station, Montreal H3C 3P8, Canada
| | - Alexandre A Arnold
- Département de Chimie, Université du Québec à Montréal , P.O. Box 8888, Downtown Station, Montreal H3C 3P8, Canada
| | - Antoine Juneau
- Département de Chimie, Université du Québec à Montréal , P.O. Box 8888, Downtown Station, Montreal H3C 3P8, Canada
| | - Aline Balieiro Gambaro
- Département de Chimie, Université du Québec à Montréal , P.O. Box 8888, Downtown Station, Montreal H3C 3P8, Canada
| | - Dror E Warschawski
- Département de Chimie, Université du Québec à Montréal , P.O. Box 8888, Downtown Station, Montreal H3C 3P8, Canada
- UMR 7099, CNRS - Université Paris Diderot, IBPC, 13 rue Pierre et Marie Curie, F-75005 Paris, France
| | - Philip T F Williamson
- Centre for Biological Sciences/Institute of Life Sciences, Highfield Campus, University of Southampton , Southampton SO17 1BJ, United Kingdom
| | - Isabelle Marcotte
- Département de Chimie, Université du Québec à Montréal , P.O. Box 8888, Downtown Station, Montreal H3C 3P8, Canada
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9
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Matsui R, Uchida N, Ohtani M, Yamada K, Shigeta A, Kawamura I, Aida T, Ishida Y. Magnetically Alignable Bicelles with Unprecedented Stability Using Tunable Surfactants Derived from Cholic Acid. Chemphyschem 2016; 17:3916-3922. [DOI: 10.1002/cphc.201600897] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2016] [Indexed: 11/09/2022]
Affiliation(s)
- Ryoichi Matsui
- Department of Chemistry and Biotechnology; School of Engineering, the; University of Tokyo; Hongo 7-3-1, Bunkyo-ku Tokyo 113-8656 Japan
| | - Noriyuki Uchida
- Department of Chemistry and Biotechnology; School of Engineering, the; University of Tokyo; Hongo 7-3-1, Bunkyo-ku Tokyo 113-8656 Japan
| | - Masataka Ohtani
- RIKEN Center for Emergent Matter Science; Hirosawa 2-1, Wako Saitama 351-0198 Japan
| | - Kuniyo Yamada
- RIKEN Center for Emergent Matter Science; Hirosawa 2-1, Wako Saitama 351-0198 Japan
| | - Arisu Shigeta
- Graduate School of Engineering; Yokohama National University; Tokiwadai 79-5, Hodogaya-ku Yokohama 240-8501 Japan
| | - Izuru Kawamura
- Graduate School of Engineering; Yokohama National University; Tokiwadai 79-5, Hodogaya-ku Yokohama 240-8501 Japan
| | - Takuzo Aida
- RIKEN Center for Emergent Matter Science; Hirosawa 2-1, Wako Saitama 351-0198 Japan
- Department of Chemistry and Biotechnology; School of Engineering, the; University of Tokyo; Hongo 7-3-1, Bunkyo-ku Tokyo 113-8656 Japan
| | - Yasuhiro Ishida
- RIKEN Center for Emergent Matter Science; Hirosawa 2-1, Wako Saitama 351-0198 Japan
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10
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Molugu TR, Brown MF. Cholesterol-induced suppression of membrane elastic fluctuations at the atomistic level. Chem Phys Lipids 2016; 199:39-51. [PMID: 27154600 DOI: 10.1016/j.chemphyslip.2016.05.001] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2016] [Revised: 04/29/2016] [Accepted: 05/02/2016] [Indexed: 12/14/2022]
Abstract
Applications of solid-state NMR spectroscopy for investigating the influences of lipid-cholesterol interactions on membrane fluctuations are reviewed in this paper. Emphasis is placed on understanding the energy landscapes and fluctuations at an emergent atomistic level. Solid-state (2)H NMR spectroscopy directly measures residual quadrupolar couplings (RQCs) due to individual C-(2)H labeled segments of the lipid molecules. Moreover, residual dipolar couplings (RDCs) of (13)C-(1)H bonds are obtained in separated local-field NMR spectroscopy. The distributions of RQC or RDC values give nearly complete profiles of the order parameters as a function of acyl segment position. Measured equilibrium properties of glycerophospholipids and sphingolipids including their binary and tertiary mixtures with cholesterol show unequal mixing associated with liquid-ordered domains. The entropic loss upon addition of cholesterol to sphingolipids is less than for glycerophospholipids and may drive the formation of lipid rafts. In addition relaxation time measurements enable one to study the molecular dynamics over a wide time-scale range. For (2)H NMR the experimental spin-lattice (R1Z) relaxation rates follow a theoretical square-law dependence on segmental order parameters (SCD) due to collective slow dynamics over mesoscopic length scales. The functional dependence for the liquid-crystalline lipid membranes is indicative of viscoelastic properties as they emerge from atomistic-level interactions. A striking decrease in square-law slope upon addition of cholesterol denotes stiffening relative to the pure lipid bilayers that is diminished in the case of lanosterol. Measured equilibrium properties and relaxation rates infer opposite influences of cholesterol and detergents on collective dynamics and elasticity at an atomistic scale that potentially affects lipid raft formation in cellular membranes.
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Affiliation(s)
- Trivikram R Molugu
- Department of Chemistry and Biochemistry, University of Arizona, Tucson, AZ 85721, USA
| | - Michael F Brown
- Department of Chemistry and Biochemistry, University of Arizona, Tucson, AZ 85721, USA; Department of Physics, University of Arizona, Tucson, AZ 85721, USA.
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11
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Salnikov ES, Aisenbrey C, Aussenac F, Ouari O, Sarrouj H, Reiter C, Tordo P, Engelke F, Bechinger B. Membrane topologies of the PGLa antimicrobial peptide and a transmembrane anchor sequence by Dynamic Nuclear Polarization/solid-state NMR spectroscopy. Sci Rep 2016; 6:20895. [PMID: 26876950 PMCID: PMC4753517 DOI: 10.1038/srep20895] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2015] [Accepted: 01/11/2016] [Indexed: 12/23/2022] Open
Abstract
Dynamic Nuclear Polarization (DNP) has been introduced to overcome the sensitivity limitations of nuclear magnetic resonance (NMR) spectroscopy also of supported lipid bilayers. When investigated by solid-state NMR techniques the approach typically involves doping the samples with biradicals and their investigation at cryo-temperatures. Here we investigated the effects of temperature and membrane hydration on the topology of amphipathic and hydrophobic membrane polypeptides. Although the antimicrobial PGLa peptide in dimyristoyl phospholipids is particularly sensitive to topological alterations, the DNP conditions represent well its membrane alignment also found in bacterial lipids at ambient temperature. With a novel membrane-anchored biradical and purpose-built hardware a 17-fold enhancement in NMR signal intensity is obtained by DNP which is one of the best obtained for a truly static matrix-free system. Furthermore, a membrane anchor sequence encompassing 19 hydrophobic amino acid residues was investigated. Although at cryotemperatures the transmembrane domain adjusts it membrane tilt angle by about 10 degrees, the temperature dependence of two-dimensional separated field spectra show that freezing the motions can have beneficial effects for the structural analysis of this sequence.
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Affiliation(s)
| | - Christopher Aisenbrey
- University of Strasbourg/CNRS, UMR7177, Chemistry Institute, 67070 Strasbourg, France
| | - Fabien Aussenac
- Bruker BioSpin, 34, rue de l’Industrie, 67166 Wissembourg, France
| | - Olivier Ouari
- Aix-Marseille University, Institut de Chimie Radicalaire, UMR 7273, Faculté des Sciences, 13397 Marseille, Cédex 20, France
| | - Hiba Sarrouj
- University of Strasbourg/CNRS, UMR7177, Chemistry Institute, 67070 Strasbourg, France
- Bruker BioSpin, Silberstreifen, 76287 Rheinstetten, Germany
| | | | - Paul Tordo
- Aix-Marseille University, Institut de Chimie Radicalaire, UMR 7273, Faculté des Sciences, 13397 Marseille, Cédex 20, France
| | - Frank Engelke
- Bruker BioSpin, Silberstreifen, 76287 Rheinstetten, Germany
| | - Burkhard Bechinger
- University of Strasbourg/CNRS, UMR7177, Chemistry Institute, 67070 Strasbourg, France
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12
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Matsui R, Ohtani M, Yamada K, Hikima T, Takata M, Nakamura T, Koshino H, Ishida Y, Aida T. Chemically Locked Bicelles with High Thermal and Kinetic Stability. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201506781] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Ryoichi Matsui
- Department of Chemistry and Biotechnology, School of Engineering, The University of Tokyo, 7‐3‐1 Hongo, Bunkyo‐ku, Tokyo 113‐8656 (Japan)
| | - Masataka Ohtani
- RIKEN Center for Emergent Material Science, 2‐1 Hirosawa, Wako, Saitama 351‐0198 (Japan)
| | - Kuniyo Yamada
- RIKEN Center for Emergent Material Science, 2‐1 Hirosawa, Wako, Saitama 351‐0198 (Japan)
| | - Takaaki Hikima
- RIKEN SPring‐8 Center, 1‐1‐1 Kouto, Sayo, Hyogo 679‐5148 (Japan)
| | - Masaki Takata
- RIKEN SPring‐8 Center, 1‐1‐1 Kouto, Sayo, Hyogo 679‐5148 (Japan)
| | - Takashi Nakamura
- RIKEN Center for Sustainable Resource Science, 2‐1 Hirosawa, Wako, Saitama 351‐0198 (Japan)
| | - Hiroyuki Koshino
- RIKEN Center for Sustainable Resource Science, 2‐1 Hirosawa, Wako, Saitama 351‐0198 (Japan)
| | - Yasuhiro Ishida
- RIKEN Center for Emergent Material Science, 2‐1 Hirosawa, Wako, Saitama 351‐0198 (Japan)
| | - Takuzo Aida
- RIKEN Center for Emergent Material Science, 2‐1 Hirosawa, Wako, Saitama 351‐0198 (Japan)
- Department of Chemistry and Biotechnology, School of Engineering, The University of Tokyo, 7‐3‐1 Hongo, Bunkyo‐ku, Tokyo 113‐8656 (Japan)
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13
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Matsui R, Ohtani M, Yamada K, Hikima T, Takata M, Nakamura T, Koshino H, Ishida Y, Aida T. Chemically Locked Bicelles with High Thermal and Kinetic Stability. Angew Chem Int Ed Engl 2015; 54:13284-8. [PMID: 26373898 DOI: 10.1002/anie.201506781] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2015] [Indexed: 11/08/2022]
Abstract
In situ polymerization of a bicellar mixture composed of a phospholipid and polymerizable surfactants afforded unprecedented stable bicelles. The polymerized composite showed an aligned phase over a wide thermal range (25 to >90 °C) with excellent (2)H quadrupole splitting of the solvent signal, thus implying versatility as an alignment medium for NMR studies. Crosslinking of the surfactants also brought favorable effects on the kinetic stability and alignment morphology of the bicelles. This system could thus offer a new class of scaffolds for biomembrane models.
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Affiliation(s)
- Ryoichi Matsui
- Department of Chemistry and Biotechnology, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656 (Japan)
| | - Masataka Ohtani
- RIKEN Center for Emergent Material Science, 2-1 Hirosawa, Wako, Saitama 351-0198 (Japan)
| | - Kuniyo Yamada
- RIKEN Center for Emergent Material Science, 2-1 Hirosawa, Wako, Saitama 351-0198 (Japan)
| | - Takaaki Hikima
- RIKEN SPring-8 Center, 1-1-1 Kouto, Sayo, Hyogo 679-5148 (Japan)
| | - Masaki Takata
- RIKEN SPring-8 Center, 1-1-1 Kouto, Sayo, Hyogo 679-5148 (Japan)
| | - Takashi Nakamura
- RIKEN Center for Sustainable Resource Science, 2-1 Hirosawa, Wako, Saitama 351-0198 (Japan)
| | - Hiroyuki Koshino
- RIKEN Center for Sustainable Resource Science, 2-1 Hirosawa, Wako, Saitama 351-0198 (Japan)
| | - Yasuhiro Ishida
- RIKEN Center for Emergent Material Science, 2-1 Hirosawa, Wako, Saitama 351-0198 (Japan).
| | - Takuzo Aida
- RIKEN Center for Emergent Material Science, 2-1 Hirosawa, Wako, Saitama 351-0198 (Japan).,Department of Chemistry and Biotechnology, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656 (Japan)
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14
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Li Q, Wong YL, Yueqi Lee M, Li Y, Kang C. Solution structure of the transmembrane domain of the mouse erythropoietin receptor in detergent micelles. Sci Rep 2015; 5:13586. [PMID: 26316120 PMCID: PMC4551963 DOI: 10.1038/srep13586] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2015] [Accepted: 07/31/2015] [Indexed: 12/19/2022] Open
Abstract
Erythropoiesis is regulated by the erythropoietin receptor (EpoR) binding to its ligand. The transmembrane domain (TMD) and the juxtamembrane (JM) regions of the EpoR are important for signal transduction across the cell membrane. We report a solution NMR study of the mouse erythropoietin receptor (mEpoR) comprising the TMD and the JM regions reconstituted in dodecylphosphocholine (DPC) micelles. The TMD and the C-terminal JM region of the mEpoR are mainly α-helical, adopting a similar structure to those of the human EpoR. Residues from S216 to T219 in mEpoR form a short helix. Relaxation study demonstrates that the TMD of the mEpoR is rigid whilst the N-terminal region preceding the TMD is flexible. Fluorescence spectroscopy and sequence analysis indicate that the C-terminal JM region is exposed to the solvent. Helix wheel result shows that there is hydrophilic patch in the TMD of the mEpoR formed by residues S231, S238 and T242, and these residues might be important for the receptor dimerization.
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Affiliation(s)
- Qingxin Li
- Institute of Chemical &Engineering Sciences, Agency for Science, Technology and Research (A*STAR), Singapore, Singapore
| | - Ying Lei Wong
- Experimental Therapeutics Centre, Agency for Science, Technology and Research (A*STAR), Singapore, 138669 Singapore
| | - Michelle Yueqi Lee
- Experimental Therapeutics Centre, Agency for Science, Technology and Research (A*STAR), Singapore, 138669 Singapore
| | - Yan Li
- Experimental Therapeutics Centre, Agency for Science, Technology and Research (A*STAR), Singapore, 138669 Singapore
| | - CongBao Kang
- Experimental Therapeutics Centre, Agency for Science, Technology and Research (A*STAR), Singapore, 138669 Singapore
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