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Kamilar E, Bariwal J, Zheng W, Ma H, Liang H. SMALPs Are Not Simply Nanodiscs: The Polymer-to-Lipid Ratios of Fractionated SMALPs Underline Their Heterogeneous Nature. Biomacromolecules 2023; 24:1819-1838. [PMID: 36947865 DOI: 10.1021/acs.biomac.3c00034] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/24/2023]
Abstract
Amphipathic styrene-maleic acid (SMA) copolymers directly solubilize biomembranes into SMA-lipid particles, or SMALPs, that are often regarded as nanodiscs and hailed as a native membrane platform. The promising outlook of SMALPs inspires the discovery of many SMA-like copolymers that also solubilize biomembranes into putative nanodiscs, but a fundamental question remains on how much the SMALPs or SMALP analogues truly resemble the bilayer structure of nanodiscs. This unfortunate ambiguity undermines the utility of SMA or SMA-like copolymers in membrane biology because the structure and function of many membrane proteins depend critically on their surrounding matrices. Here, we report the structural heterogeneity of SMALPs revealed through fractionating SMALPs comprised of lipids and well-defined SMAs via size-exclusion chromatography followed by quantitative determination of the polymer-to-lipid (P/L) stoichiometric ratios in individual fractions. Through the lens of P/L stoichiometric ratios, different self-assembled polymer-lipid nanostructures are inferred, such as polymer-remodeled liposomes, polymer-encased nanodiscs, polymer-lipid mixed micelles, and lipid-doped polymer micellar aggregates. We attribute the structural heterogeneity of SMALPs to the microstructure variations amongst individual polymer chains that give rise to their polydisperse detergency. As an example, we demonstrate that SMAs with a similar S/MA ratio but different chain sizes participate preferentially in different polymer-lipid nanostructures. We further demonstrate that proteorhodopsin, a light-driven proton pump solubilized within the same SMALPs is distributed amongst different self-assembled nanostructures to display different photocycle kinetics. Our discovery challenges the native nanodisc notion of SMALPs or SMALP analogues and highlights the necessity to separate and identify the structurally dissimilar polymer-lipid particles in membrane biology studies.
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Affiliation(s)
- Elizabeth Kamilar
- Department of Cell Physiology & Molecular Biophysics, Center for Membrane Protein Research, School of Medicine, Texas Tech University Health Sciences Center, Lubbock, Texas 79430, United States
| | - Jitender Bariwal
- Department of Cell Physiology & Molecular Biophysics, Center for Membrane Protein Research, School of Medicine, Texas Tech University Health Sciences Center, Lubbock, Texas 79430, United States
| | - Wan Zheng
- Department of Cell Physiology & Molecular Biophysics, Center for Membrane Protein Research, School of Medicine, Texas Tech University Health Sciences Center, Lubbock, Texas 79430, United States
| | - Hairong Ma
- Department of Cell Physiology & Molecular Biophysics, Center for Membrane Protein Research, School of Medicine, Texas Tech University Health Sciences Center, Lubbock, Texas 79430, United States
| | - Hongjun Liang
- Department of Cell Physiology & Molecular Biophysics, Center for Membrane Protein Research, School of Medicine, Texas Tech University Health Sciences Center, Lubbock, Texas 79430, United States
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2
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Lo CH, Zeng J. Application of polymersomes in membrane protein study and drug discovery: Progress, strategies, and perspectives. Bioeng Transl Med 2022; 8:e10350. [PMID: 36684106 PMCID: PMC9842050 DOI: 10.1002/btm2.10350] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2022] [Revised: 05/08/2022] [Accepted: 05/10/2022] [Indexed: 01/25/2023] Open
Abstract
Membrane proteins (MPs) play key roles in cellular signaling pathways and are responsible for intercellular and intracellular interactions. Dysfunctional MPs are directly related to the pathogenesis of various diseases, and they have been exploited as one of the most sought-after targets in the pharmaceutical industry. However, working with MPs is difficult given that their amphiphilic nature requires protection from biological membrane or membrane mimetics. Polymersomes are bilayered nano-vesicles made of self-assembled block copolymers that have been widely used as cell membrane mimetics for MP reconstitution and in engineering of artificial cells. This review highlights the prevailing trend in the application of polymersomes in MP study and drug discovery. We begin with a review on the techniques for synthesis and characterization of polymersomes as well as methods of MP insertion to form proteopolymersomes. Next, we review the structural and functional analysis of the different types of MPs reconstituted in polymersomes, including membrane transport proteins, MP complexes, and membrane receptors. We then summarize the factors affecting reconstitution efficiency and the quality of reconstituted MPs for structural and functional studies. Additionally, we discuss the potential in using proteopolymersomes as platforms for high-throughput screening (HTS) in drug discovery to identify modulators of MPs. We conclude by providing future perspectives and recommendations on advancing the study of MPs and drug development using proteopolymersomes.
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Affiliation(s)
- Chih Hung Lo
- Lee Kong Chian School of MedicineNanyang Technological UniversitySingaporeSingapore,Department of Neurology, Brigham and Women's Hospital, Harvard Medical SchoolBostonMassachusettsUSA
| | - Jialiu Zeng
- Lee Kong Chian School of MedicineNanyang Technological UniversitySingaporeSingapore,Department of Biomedical EngineeringBoston UniversityBostonMassachusettsUSA,Department of ChemistryBoston UniversityBostonMassachusettsUSA
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de Grip WJ, Ganapathy S. Rhodopsins: An Excitingly Versatile Protein Species for Research, Development and Creative Engineering. Front Chem 2022; 10:879609. [PMID: 35815212 PMCID: PMC9257189 DOI: 10.3389/fchem.2022.879609] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2022] [Accepted: 05/16/2022] [Indexed: 01/17/2023] Open
Abstract
The first member and eponym of the rhodopsin family was identified in the 1930s as the visual pigment of the rod photoreceptor cell in the animal retina. It was found to be a membrane protein, owing its photosensitivity to the presence of a covalently bound chromophoric group. This group, derived from vitamin A, was appropriately dubbed retinal. In the 1970s a microbial counterpart of this species was discovered in an archaeon, being a membrane protein also harbouring retinal as a chromophore, and named bacteriorhodopsin. Since their discovery a photogenic panorama unfolded, where up to date new members and subspecies with a variety of light-driven functionality have been added to this family. The animal branch, meanwhile categorized as type-2 rhodopsins, turned out to form a large subclass in the superfamily of G protein-coupled receptors and are essential to multiple elements of light-dependent animal sensory physiology. The microbial branch, the type-1 rhodopsins, largely function as light-driven ion pumps or channels, but also contain sensory-active and enzyme-sustaining subspecies. In this review we will follow the development of this exciting membrane protein panorama in a representative number of highlights and will present a prospect of their extraordinary future potential.
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Affiliation(s)
- Willem J. de Grip
- Leiden Institute of Chemistry, Department of Biophysical Organic Chemistry, Leiden University, Leiden, Netherlands
- Radboud Institute for Molecular Life Sciences, Radboud University Medical Center, Nijmegen, Netherlands
| | - Srividya Ganapathy
- Department of Imaging Physics, Delft University of Technology, Netherlands
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Peng C, Kuang L, Zhao J, Ross AE, Wang Z, Ciolino JB. Bibliometric and visualized analysis of ocular drug delivery from 2001 to 2020. J Control Release 2022; 345:625-645. [PMID: 35321827 DOI: 10.1016/j.jconrel.2022.03.031] [Citation(s) in RCA: 55] [Impact Index Per Article: 27.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2021] [Revised: 03/15/2022] [Accepted: 03/16/2022] [Indexed: 01/01/2023]
Abstract
OBJECTIVE To perform a bibliometric analysis in the field of ocular drug delivery research to characterize the current international trends and to present visual representations of the past and emerging trends on ocular drug delivery research over the past decade. METHOD In this cross-sectional study, a bibliometric analysis of data retrieved and extracted from the Web of Science Core Collection (WoSCC) database was performed to analyze evolution and theme trends on ocular drug delivery research from January 1, 2001, to December 31, 2020. A total of 4334 articles on ocular drug delivery were evaluated for specific characteristics, such as publication year, journals, authors, institutions, countries/regions, references, and keywords. Co-authorship analysis, co-occurrence analysis, co-citation analysis, and network visualization were constructed by VOSviewer. Some important subtopics identified by bibliometric characterization were further discussed and reviewed. RESULTS From 2001 to 2020, the annual global publications increased by 746.15%, from 52 to 440. International Journal of Pharmaceutics published the most manuscripts (250 publications) and produced the highest citations (9509 citations), followed by Investigative Ophthalmology & Visual Science (202 publications) and Journal of Ocular Pharmacology and Therapeutics (136 publications). The United States (1289 publications, 31,512 citations), the University of Florida (82 publications, 2986 citations), and Chauhan, Anuj (52 publications, 2354 citations) were the most productive and impactful institution, country, and author respectively. The co-occurrence cluster analysis of the top 100 keywords form five clusters: (1) micro/nano ocular drug delivery systems; (2) the treatment of inflammation and posterior diseases; (3) macroscopic ocular drug delivery systems/devices; (4) the characteristics of drug delivery systems; (5) and the ocular drug delivery for glaucoma treatment. Diabetic macular edema, anti-VEGF, ranibizumab, bevacizumab, micelles and latanoprost, were the latest high-frequency keywords, indicating the emerging frontiers of ocular drug delivery. Further discussions into the subtopics were provided to assist researchers to determine the range of research topics and plan research direction. CONCLUSIONS Over the last two decades there has been a progressive increase in the number of publications and citations on research related to ocular drug delivery across many countries, institutions, and authors. The present study sheds light on current trends, global collaboration patterns, basic knowledge, research hotspots, and emerging frontiers of ocular drug delivery. Novel solutions for ocular drug delivery and the treatment of inflammation and posterior diseases were the major themes over the last 20 years.
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Park S, Lee J, Khan S, Wahab A, Kim M. Machine Learning-Based Heavy Metal Ion Detection Using Surface-Enhanced Raman Spectroscopy. SENSORS (BASEL, SWITZERLAND) 2022; 22:596. [PMID: 35062556 PMCID: PMC8778908 DOI: 10.3390/s22020596] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/22/2021] [Revised: 12/27/2021] [Accepted: 01/10/2022] [Indexed: 02/06/2023]
Abstract
Surface-Enhanced Raman Spectroscopy (SERS) is often used for heavy metal ion detection. However, large variations in signal strength, spectral profile, and nonlinearity of measurements often cause problems that produce varying results. It raises concerns about the reproducibility of the results. Consequently, the manual classification of the SERS spectrum requires carefully controlled experimentation that further hinders the large-scale adaptation. Recent advances in machine learning offer decent opportunities to address these issues. However, well-documented procedures for model development and evaluation, as well as benchmark datasets, are missing. Towards this end, we provide the SERS spectral benchmark dataset of lead(II) nitride (Pb(NO3)2) for a heavy metal ion detection task and evaluate the classification performance of several machine learning models. We also perform a comparative study to find the best combination between the preprocessing methods and the machine learning models. The proposed model can successfully identify the Pb(NO3)2 molecule from SERS measurements of independent test experiments. In particular, the proposed model shows an 84.6% balanced accuracy for the cross-batch testing task.
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Affiliation(s)
- Seongyong Park
- Department of Bio and Brain Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Korea; (S.P.); (S.K.)
| | - Jaeseok Lee
- Department of Mechanical System Engineering, Kumoh National Institute of Technology, Gumi 39177, Korea;
- Department of Aeronautics, Mechanical and Electronic Convergence Engineering, Kumoh National Institute of Technology, Gumi 39177, Korea
| | - Shujaat Khan
- Department of Bio and Brain Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Korea; (S.P.); (S.K.)
| | - Abdul Wahab
- Department of Mathematics, Nazarbayev University, Nur-Sultan 010000, Kazakhstan;
| | - Minseok Kim
- Department of Mechanical System Engineering, Kumoh National Institute of Technology, Gumi 39177, Korea;
- Department of Aeronautics, Mechanical and Electronic Convergence Engineering, Kumoh National Institute of Technology, Gumi 39177, Korea
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6
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Synergistic regulation of nonbinary molecular switches by protonation and light. Proc Natl Acad Sci U S A 2021; 118:2112973118. [PMID: 34789566 DOI: 10.1073/pnas.2112973118] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/06/2021] [Indexed: 11/18/2022] Open
Abstract
We report a molecular switching ensemble whose states may be regulated in synergistic fashion by both protonation and photoirradiation. This allows hierarchical control in both a kinetic and thermodynamic sense. These pseudorotaxane-based molecular devices exploit the so-called Texas-sized molecular box (cyclo[2]-(2,6-di(1H-imidazol-1-yl)pyridine)[2](1,4-dimethylenebenzene); 14+, studied as its tetrakis-PF6 - salt) as the wheel component. Anions of azobenzene-4,4'-dicarboxylic acid (2H+•2) or 4,4'-stilbenedicarboxylic acid (2H+•3) serve as the threading rod elements. The various forms of 2 and 3 (neutral, monoprotonated, and diprotonated) interact differently with 14+, as do the photoinduced cis or trans forms of these classic photoactive guests. The net result is a multimodal molecular switch that can be regulated in synergistic fashion through protonation/deprotonation and photoirradiation. The degree of guest protonation is the dominating control factor, with light acting as a secondary regulatory stimulus. The present dual input strategy provides a complement to more traditional orthogonal stimulus-based approaches to molecular switching and allows for the creation of nonbinary stimulus-responsive functional materials.
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Otrin L, Witkowska A, Marušič N, Zhao Z, Lira RB, Kyrilis FL, Hamdi F, Ivanov I, Lipowsky R, Kastritis PL, Dimova R, Sundmacher K, Jahn R, Vidaković-Koch T. En route to dynamic life processes by SNARE-mediated fusion of polymer and hybrid membranes. Nat Commun 2021; 12:4972. [PMID: 34404795 PMCID: PMC8371082 DOI: 10.1038/s41467-021-25294-z] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2021] [Accepted: 07/30/2021] [Indexed: 12/11/2022] Open
Abstract
A variety of artificial cells springs from the functionalization of liposomes with proteins. However, these models suffer from low durability without repair and replenishment mechanisms, which can be partly addressed by replacing the lipids with polymers. Yet natural membranes are also dynamically remodeled in multiple cellular processes. Here, we show that synthetic amphiphile membranes also undergo fusion, mediated by the protein machinery for synaptic secretion. We integrated fusogenic SNAREs in polymer and hybrid vesicles and observed efficient membrane and content mixing. We determined bending rigidity and pore edge tension as key parameters for fusion and described its plausible progression through cryo-EM snapshots. These findings demonstrate that dynamic membrane phenomena can be reconstituted in synthetic materials, thereby providing new tools for the assembly of synthetic protocells.
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Affiliation(s)
- Lado Otrin
- Electrochemical Energy Conversion, Max Planck Institute for Dynamics of Complex Technical Systems, Magdeburg, Germany.
| | - Agata Witkowska
- Laboratory of Neurobiology, Max Planck Institute for Biophysical Chemistry, Göttingen, Germany
- Department of Molecular Pharmacology and Cell Biology, Leibniz-Forschungsinstitut für Molekulare Pharmakologie (FMP), Berlin, Germany
| | - Nika Marušič
- Process Systems Engineering, Max Planck Institute for Dynamics of Complex Technical Systems, Magdeburg, Germany
| | - Ziliang Zhao
- Department of Theory and Bio-Systems, Max Planck Institute of Colloids and Interfaces, Potsdam, Germany
| | - Rafael B Lira
- Department of Theory and Bio-Systems, Max Planck Institute of Colloids and Interfaces, Potsdam, Germany
- Moleculaire Biofysica, Zernike Instituut, Rijksuniversiteit Groningen, Groningen, Netherlands
| | - Fotis L Kyrilis
- Interdisciplinary Research Center HALOmem & Institute of Biochemistry and Biotechnology, Martin Luther University Halle-Wittenberg, Biozentrum, Halle/Saale, Germany
| | - Farzad Hamdi
- Interdisciplinary Research Center HALOmem & Institute of Biochemistry and Biotechnology, Martin Luther University Halle-Wittenberg, Biozentrum, Halle/Saale, Germany
| | - Ivan Ivanov
- Process Systems Engineering, Max Planck Institute for Dynamics of Complex Technical Systems, Magdeburg, Germany
| | - Reinhard Lipowsky
- Department of Theory and Bio-Systems, Max Planck Institute of Colloids and Interfaces, Potsdam, Germany
| | - Panagiotis L Kastritis
- Interdisciplinary Research Center HALOmem & Institute of Biochemistry and Biotechnology, Martin Luther University Halle-Wittenberg, Biozentrum, Halle/Saale, Germany
| | - Rumiana Dimova
- Department of Theory and Bio-Systems, Max Planck Institute of Colloids and Interfaces, Potsdam, Germany
| | - Kai Sundmacher
- Process Systems Engineering, Max Planck Institute for Dynamics of Complex Technical Systems, Magdeburg, Germany
| | - Reinhard Jahn
- Laboratory of Neurobiology, Max Planck Institute for Biophysical Chemistry, Göttingen, Germany
| | - Tanja Vidaković-Koch
- Electrochemical Energy Conversion, Max Planck Institute for Dynamics of Complex Technical Systems, Magdeburg, Germany
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8
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Chen A, Majdinasab EJ, Fiori MC, Liang H, Altenberg GA. Polymer-Encased Nanodiscs and Polymer Nanodiscs: New Platforms for Membrane Protein Research and Applications. Front Bioeng Biotechnol 2020; 8:598450. [PMID: 33304891 PMCID: PMC7701119 DOI: 10.3389/fbioe.2020.598450] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2020] [Accepted: 10/27/2020] [Indexed: 12/18/2022] Open
Abstract
Membrane proteins (MPs) are essential to many organisms’ major functions. They are notorious for being difficult to isolate and study, and mimicking native conditions for studies in vitro has proved to be a challenge. Lipid nanodiscs are among the most promising platforms for MP reconstitution, but they contain a relatively labile lipid bilayer and their use requires previous protein solubilization in detergent. These limitations have led to the testing of copolymers in new types of nanodisc platforms. Polymer-encased nanodiscs and polymer nanodiscs support functional MPs and address some of the limitations present in other MP reconstitution platforms. In this review, we provide a summary of recent developments in the use of polymers in nanodiscs.
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Affiliation(s)
- Angela Chen
- School of Medicine, Texas Tech University Health Sciences Center, Lubbock, TX, United States
| | - Elleana J Majdinasab
- School of Medicine, Texas Tech University Health Sciences Center, Lubbock, TX, United States
| | - Mariana C Fiori
- Department of Cell Physiology and Molecular Biophysics, and Center for Membrane Protein Research, School of Medicine, Texas Tech University Health Sciences Center, Lubbock, TX, United States
| | - Hongjun Liang
- Department of Cell Physiology and Molecular Biophysics, and Center for Membrane Protein Research, School of Medicine, Texas Tech University Health Sciences Center, Lubbock, TX, United States
| | - Guillermo A Altenberg
- Department of Cell Physiology and Molecular Biophysics, and Center for Membrane Protein Research, School of Medicine, Texas Tech University Health Sciences Center, Lubbock, TX, United States
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Moreno S, Sharan P, Engelke J, Gumz H, Boye S, Oertel U, Wang P, Banerjee S, Klajn R, Voit B, Lederer A, Appelhans D. Light-Driven Proton Transfer for Cyclic and Temporal Switching of Enzymatic Nanoreactors. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2020; 16:e2002135. [PMID: 32783385 DOI: 10.1002/smll.202002135] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/02/2020] [Revised: 05/25/2020] [Indexed: 06/11/2023]
Abstract
Temporal activation of biological processes by visible light and subsequent return to an inactive state in the absence of light is an essential characteristic of photoreceptor cells. Inspired by these phenomena, light-responsive materials are very attractive due to the high spatiotemporal control of light irradiation, with light being able to precisely orchestrate processes repeatedly over many cycles. Herein, it is reported that light-driven proton transfer triggered by a merocyanine-based photoacid can be used to modulate the permeability of pH-responsive polymersomes through cyclic, temporally controlled protonation and deprotonation of the polymersome membrane. The membranes can undergo repeated light-driven swelling-contraction cycles without losing functional effectiveness. When applied to enzyme loaded-nanoreactors, this membrane responsiveness is used for the reversible control of enzymatic reactions. This combination of the merocyanine-based photoacid and pH-switchable nanoreactors results in rapidly responding and versatile supramolecular systems successfully used to switch enzymatic reactions ON and OFF on demand.
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Affiliation(s)
- Silvia Moreno
- Leibniz-Institut für Polymerforschung Dresden e.V., Hohe Straße 6, Dresden, 01069, Germany
| | - Priyanka Sharan
- Leibniz-Institut für Polymerforschung Dresden e.V., Hohe Straße 6, Dresden, 01069, Germany
- Faculty of Chemistry and Food Chemistry, Technische Universität Dresden, Dresden, 01062, Germany
- Materials Science Centre, Indian Institute of Technology Kharagpur, Kharagpur, 721302, India
| | - Johanna Engelke
- Leibniz-Institut für Polymerforschung Dresden e.V., Hohe Straße 6, Dresden, 01069, Germany
- Faculty of Chemistry and Food Chemistry, Technische Universität Dresden, Dresden, 01062, Germany
| | - Hannes Gumz
- Leibniz-Institut für Polymerforschung Dresden e.V., Hohe Straße 6, Dresden, 01069, Germany
- Center for Advancing Electronics Dresden, Technische Universität Dresden, Dresden, 01062, Germany
| | - Susanne Boye
- Leibniz-Institut für Polymerforschung Dresden e.V., Hohe Straße 6, Dresden, 01069, Germany
| | - Ulrich Oertel
- Leibniz-Institut für Polymerforschung Dresden e.V., Hohe Straße 6, Dresden, 01069, Germany
| | - Peng Wang
- Leibniz-Institut für Polymerforschung Dresden e.V., Hohe Straße 6, Dresden, 01069, Germany
- Faculty of Chemistry and Food Chemistry, Technische Universität Dresden, Dresden, 01062, Germany
| | - Susanta Banerjee
- Materials Science Centre, Indian Institute of Technology Kharagpur, Kharagpur, 721302, India
| | - Rafal Klajn
- Department of Organic Chemistry, Weizmann Institute of Science, Rehovot, 76100, Israel
| | - Brigitte Voit
- Leibniz-Institut für Polymerforschung Dresden e.V., Hohe Straße 6, Dresden, 01069, Germany
- Faculty of Chemistry and Food Chemistry, Technische Universität Dresden, Dresden, 01062, Germany
- Center for Advancing Electronics Dresden, Technische Universität Dresden, Dresden, 01062, Germany
| | - Albena Lederer
- Leibniz-Institut für Polymerforschung Dresden e.V., Hohe Straße 6, Dresden, 01069, Germany
- Faculty of Chemistry and Food Chemistry, Technische Universität Dresden, Dresden, 01062, Germany
- Department of Chemistry and Polymer Science, Stellenbosch University, Private Bag X1, Matieland, 7602, South Africa
| | - Dietmar Appelhans
- Leibniz-Institut für Polymerforschung Dresden e.V., Hohe Straße 6, Dresden, 01069, Germany
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Liang H, Guo Y, Shi Y, Peng X, Liang B, Chen B. A Light‐Responsive Metal–Organic Framework Hybrid Membrane with High On/Off Photoswitchable Proton Conductivity. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202002389] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Hong‐Qing Liang
- Department of Chemistry University of Texas at San Antonio San Antonio TX 78249 USA
| | - Yi Guo
- State Key Laboratory of Silicon Materials Department of Materials Science and Engineering Zhejiang University Hangzhou 310027 P. R. China
| | - Yanshu Shi
- Department of Chemistry University of Texas at San Antonio San Antonio TX 78249 USA
| | - Xinsheng Peng
- State Key Laboratory of Silicon Materials Department of Materials Science and Engineering Zhejiang University Hangzhou 310027 P. R. China
| | - Bin Liang
- Department of Chemistry University of Texas at San Antonio San Antonio TX 78249 USA
| | - Banglin Chen
- Department of Chemistry University of Texas at San Antonio San Antonio TX 78249 USA
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11
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Liang H, Guo Y, Shi Y, Peng X, Liang B, Chen B. A Light‐Responsive Metal–Organic Framework Hybrid Membrane with High On/Off Photoswitchable Proton Conductivity. Angew Chem Int Ed Engl 2020; 59:7732-7737. [DOI: 10.1002/anie.202002389] [Citation(s) in RCA: 61] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2020] [Indexed: 01/03/2023]
Affiliation(s)
- Hong‐Qing Liang
- Department of Chemistry University of Texas at San Antonio San Antonio TX 78249 USA
| | - Yi Guo
- State Key Laboratory of Silicon Materials Department of Materials Science and Engineering Zhejiang University Hangzhou 310027 P. R. China
| | - Yanshu Shi
- Department of Chemistry University of Texas at San Antonio San Antonio TX 78249 USA
| | - Xinsheng Peng
- State Key Laboratory of Silicon Materials Department of Materials Science and Engineering Zhejiang University Hangzhou 310027 P. R. China
| | - Bin Liang
- Department of Chemistry University of Texas at San Antonio San Antonio TX 78249 USA
| | - Banglin Chen
- Department of Chemistry University of Texas at San Antonio San Antonio TX 78249 USA
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12
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Belluati A, Mikhalevich V, Yorulmaz Avsar S, Daubian D, Craciun I, Chami M, Meier WP, Palivan CG. How Do the Properties of Amphiphilic Polymer Membranes Influence the Functional Insertion of Peptide Pores? Biomacromolecules 2019; 21:701-715. [DOI: 10.1021/acs.biomac.9b01416] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Andrea Belluati
- Department of Chemistry, University of Basel, Mattenstrasse 24a, BPR 1096, 4058 Basel, Switzerland
| | - Viktoria Mikhalevich
- Department of Chemistry, University of Basel, Mattenstrasse 24a, BPR 1096, 4058 Basel, Switzerland
| | - Saziye Yorulmaz Avsar
- Department of Chemistry, University of Basel, Mattenstrasse 24a, BPR 1096, 4058 Basel, Switzerland
| | - Davy Daubian
- Department of Chemistry, University of Basel, Mattenstrasse 24a, BPR 1096, 4058 Basel, Switzerland
| | - Ioana Craciun
- Department of Chemistry, University of Basel, Mattenstrasse 24a, BPR 1096, 4058 Basel, Switzerland
| | - Mohamed Chami
- BioEM Lab, Biozentrum, University of Basel, Mattenstrasse 26, 4058 Basel, Switzerland
| | - Wolfgang P. Meier
- Department of Chemistry, University of Basel, Mattenstrasse 24a, BPR 1096, 4058 Basel, Switzerland
| | - Cornelia G. Palivan
- Department of Chemistry, University of Basel, Mattenstrasse 24a, BPR 1096, 4058 Basel, Switzerland
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13
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Yewdall NA, Mason AF, van Hest JCM. The hallmarks of living systems: towards creating artificial cells. Interface Focus 2018; 8:20180023. [PMID: 30443324 PMCID: PMC6227776 DOI: 10.1098/rsfs.2018.0023] [Citation(s) in RCA: 88] [Impact Index Per Article: 14.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/29/2018] [Indexed: 01/01/2023] Open
Abstract
Despite the astonishing diversity and complexity of living systems, they all share five common hallmarks: compartmentalization, growth and division, information processing, energy transduction and adaptability. In this review, we give not only examples of how cells satisfy these requirements for life and the ways in which it is possible to emulate these characteristics in engineered platforms, but also the gaps that remain to be bridged. The bottom-up synthesis of life-like systems continues to be driven forward by the advent of new technologies, by the discovery of biological phenomena through their transplantation to experimentally simpler constructs and by providing insights into one of the oldest questions posed by mankind, the origin of life on Earth.
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Affiliation(s)
| | | | - Jan C. M. van Hest
- Eindhoven University of Technology, PO Box 513 (STO 3.31), Eindhoven, MB, The Netherlands
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14
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15
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Ishiwari F, Sakamoto M, Matsumura S, Fukushima T. Topology Effect of AIEgen-Appended Poly(acrylic acid) with Biocompatible Segments on Ca 2+-Sensing and Protein-Adsorption-Resistance Properties. ACS Macro Lett 2018; 7:711-715. [PMID: 35632952 DOI: 10.1021/acsmacrolett.8b00291] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
We recently reported that tetraphenylethene-appended poly(acrylic acid) derivatives (e.g., PAA-TPE0.02) can serve as fluorescent Ca2+ sensors in the presence of physiological concentrations of biologically relevant ions, amino acids, and sugars. However, in the presence of basic proteins such as albumins, the Ca2+-sensing property of the polymer is significantly impaired due to the nonspecific adsorption of protein molecules, which competes with binding to Ca2+. To solve this problem, we explored new designs by focusing on the polymer-chain topology of PAA-TPE0.02 with biocompatible segments. Here, we report the Ca2+-sensing and protein-adsorption-resistance properties of various types of PAA-TPE0.02 copolymers with a poly(oligoethylene glycol acrylate) (polyOEGA) segment, featuring a random, diblock, triblock, or 4-armed-star-block structure. Through this study, we show an interesting topology effect; i.e., a branch-shaped PAA-TPE0.02-co-polyOEGA with biocompatible segments at every terminal (i.e., 4-armed-star-block copolymer) exhibits both good Ca2+-sensing and protein-adsorption-resistance properties.
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Affiliation(s)
- Fumitaka Ishiwari
- Laboratory for Chemistry and Life Science, Institute of Innovative Research, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan
| | - Minami Sakamoto
- Laboratory for Chemistry and Life Science, Institute of Innovative Research, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan
| | - Satoko Matsumura
- Laboratory for Chemistry and Life Science, Institute of Innovative Research, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan
| | - Takanori Fukushima
- Laboratory for Chemistry and Life Science, Institute of Innovative Research, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan
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16
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17
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Li A, Pazzi J, Xu M, Subramaniam AB. Cellulose Abetted Assembly and Temporally Decoupled Loading of Cargo into Vesicles Synthesized from Functionally Diverse Lamellar Phase Forming Amphiphiles. Biomacromolecules 2018; 19:849-859. [DOI: 10.1021/acs.biomac.7b01645] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Alexander Li
- Department of Bioengineering, University of California, Merced, Merced, California 95343, United States
| | - Joseph Pazzi
- Department of Bioengineering, University of California, Merced, Merced, California 95343, United States
| | - Melissa Xu
- Department of Bioengineering, University of California, Merced, Merced, California 95343, United States
| | - Anand Bala Subramaniam
- Department of Bioengineering, University of California, Merced, Merced, California 95343, United States
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18
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Polymer Nanodiscs: Discoidal Amphiphilic Block Copolymer Membranes as a New Platform for Membrane Proteins. Sci Rep 2017; 7:15227. [PMID: 29123151 PMCID: PMC5680229 DOI: 10.1038/s41598-017-15151-9] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2017] [Accepted: 10/18/2017] [Indexed: 12/23/2022] Open
Abstract
Lipid nanodiscs are playing increasingly important roles in studies of the structure and function of membrane proteins. Development of lipid nanodiscs as a membrane-protein-supporting platform, or a drug targeting and delivery vehicle in general, is undermined by the fluidic and labile nature of lipid bilayers. Here, we report the discovery of polymer nanodiscs, i.e., discoidal amphiphilic block copolymer membrane patches encased within membrane scaffold proteins, as a novel two-dimensional nanomembrane that maintains the advantages of lipid nanodiscs while addressing their weaknesses. Using MsbA, a bacterial ATP-binding cassette transporter as a membrane protein prototype, we show that the protein can be reconstituted into the polymer nanodiscs in an active state. As with lipid nanodiscs, reconstitution of detergent-solubilized MsbA into the polymer nanodiscs significantly enhances its activity. In contrast to lipid nanodiscs that undergo time- and temperature-dependent structural changes, the polymer nanodiscs experience negligible structural evolution under similar environmental stresses, revealing a critically important property for the development of nanodisc-based characterization methodologies or biotechnologies. We expect that the higher mechanical and chemical stability of block copolymer membranes and their chemical versatility for adaptation will open new opportunities for applications built upon diverse membrane protein functions, or involved with drug targeting and delivery.
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Polymer-encased nanodiscs with improved buffer compatibility. Sci Rep 2017; 7:7432. [PMID: 28785023 PMCID: PMC5547149 DOI: 10.1038/s41598-017-07110-1] [Citation(s) in RCA: 56] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2017] [Accepted: 06/23/2017] [Indexed: 01/07/2023] Open
Abstract
Styrene-maleic acid copolymers allow for solubilization and reconstitution of membrane proteins into nanodiscs. These polymer-encased nanodiscs are promising platforms for studies of membrane proteins in a near-physiologic environment without the use of detergents. However, current styrene-maleic acid copolymers display severe limitations in terms of buffer compatibility and ensued flexibility for various applications. Here, we present a new family of styrene-maleic acid copolymers that do not aggregate at low pH or in the presence of polyvalent cations, and can be used to solubilize membrane proteins and produce nanodiscs of controlled sizes.
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Hu Z, Ho JC, Nallani M. Synthetic (polymer) biology (membrane): functionalization of polymer scaffolds for membrane proteins. Curr Opin Biotechnol 2017; 46:51-56. [DOI: 10.1016/j.copbio.2016.10.012] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2016] [Accepted: 10/24/2016] [Indexed: 12/13/2022]
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21
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Beales PA, Khan S, Muench SP, Jeuken LJC. Durable vesicles for reconstitution of membrane proteins in biotechnology. Biochem Soc Trans 2017; 45:15-26. [PMID: 28202656 PMCID: PMC5310719 DOI: 10.1042/bst20160019] [Citation(s) in RCA: 46] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2016] [Revised: 10/14/2016] [Accepted: 10/19/2016] [Indexed: 12/31/2022]
Abstract
The application of membrane proteins in biotechnology requires robust, durable reconstitution systems that enhance their stability and support their functionality in a range of working environments. Vesicular architectures are highly desirable to provide the compartmentalisation to utilise the functional transmembrane transport and signalling properties of membrane proteins. Proteoliposomes provide a native-like membrane environment to support membrane protein function, but can lack the required chemical and physical stability. Amphiphilic block copolymers can also self-assemble into polymersomes: tough vesicles with improved stability compared with liposomes. This review discusses the reconstitution of membrane proteins into polymersomes and the more recent development of hybrid vesicles, which blend the robust nature of block copolymers with the biofunctionality of lipids. These novel synthetic vesicles hold great promise for enabling membrane proteins within biotechnologies by supporting their enhanced in vitro performance and could also contribute to fundamental biochemical and biophysical research by improving the stability of membrane proteins that are challenging to work with.
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Affiliation(s)
- Paul A Beales
- School of Chemistry and Astbury Centre for Structural Molecular Biology, University of Leeds, Leeds LS2 9JT, U.K.
| | - Sanobar Khan
- School of Chemistry and Astbury Centre for Structural Molecular Biology, University of Leeds, Leeds LS2 9JT, U.K
| | - Stephen P Muench
- School of Biomedical Sciences and Astbury Centre for Structural Molecular Biology, University of Leeds, Leeds LS2 9JT, U.K
| | - Lars J C Jeuken
- School of Biomedical Sciences and Astbury Centre for Structural Molecular Biology, University of Leeds, Leeds LS2 9JT, U.K
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22
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Gonzalez-Perez A, Feld K, Ruso JM. Polymersomes mimic biofilms fractal growth. JOURNAL OF POLYMER RESEARCH 2016. [DOI: 10.1007/s10965-016-1085-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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23
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Xiao K, Wen L, Jiang L. Biomimetic Solid-State Nanochannels: From Fundamental Research to Practical Applications. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2016; 12:2810-2831. [PMID: 27040151 DOI: 10.1002/smll.201600359] [Citation(s) in RCA: 109] [Impact Index Per Article: 13.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/02/2016] [Revised: 02/25/2016] [Indexed: 06/05/2023]
Abstract
In recent years, solid-state smart nanopores/nanochannels for intelligent control of the transportation of ions and molecules as organisms have been extensively studied, because they hold great potential applications in molecular sieves, nanofluidics, energy conversion, and biosensors. To keep up with the fast development of this field, it is necessary to summarize the construction, characterization, and application of biomimetic smart nanopores/nanochannels. These can be classified into four sections: the fabrication of solid-state nanopores/nanochannels, the functionalization methods and materials, the mechanism explanation about the ion rectification, and the practical applications. A brief conclusion and outlook for the biomimetic nanochannels is provided, highlighting those that could be developed and integrated into devices for use in tackling current and the future problems including resources, energy, environment, and health.
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Affiliation(s)
- Kai Xiao
- Beijing National Laboratory for Molecular Sciences (BNLMS), Key Laboratory of Green Printing, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, P. R. China
| | - Liping Wen
- Laboratory of Bioinspired Smart Interfacial Science, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, 100190, P. R. China
| | - Lei Jiang
- Laboratory of Bioinspired Smart Interfacial Science, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, 100190, P. R. China
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24
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Chawla U, Jiang Y, Zheng W, Kuang L, Perera SMDC, Pitman MC, Brown MF, Liang H. A Usual G-Protein-Coupled Receptor in Unusual Membranes. Angew Chem Int Ed Engl 2016; 55:588-92. [PMID: 26633591 PMCID: PMC5233722 DOI: 10.1002/anie.201508648] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2015] [Revised: 11/02/2015] [Indexed: 12/30/2022]
Abstract
G-protein-coupled receptors (GPCRs) are the largest family of membrane-bound receptors and constitute about 50% of all known drug targets. They offer great potential for membrane protein nanotechnologies. We report here a charge-interaction-directed reconstitution mechanism that induces spontaneous insertion of bovine rhodopsin, the eukaryotic GPCR, into both lipid- and polymer-based artificial membranes. We reveal a new allosteric mode of rhodopsin activation incurred by the non-biological membranes: the cationic membrane drives a transition from the inactive MI to the activated MII state in the absence of high [H(+)] or negative spontaneous curvature. We attribute this activation to the attractive charge interaction between the membrane surface and the deprotonated Glu134 residue of the rhodopsin-conserved ERY sequence motif that helps break the cytoplasmic "ionic lock". This study unveils a novel design concept of non-biological membranes to reconstitute and harness GPCR functions in synthetic systems.
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Affiliation(s)
- Udeep Chawla
- Department of Chemistry & Biochemistry, Department of Physics University of Arizona, Tucson, AZ 85721 (USA)
| | - Yunjiang Jiang
- Department of Metallurgical & Materials Engineering, Colorado School of Mines, Golden, CO 80401 (USA)
- Current address: Department of Cell Physiology and Molecular Biophysics, Center for Membrane Protein Research, Texas Tech, University Health Science Center, Lubbock, TX 79430 (USA)
| | - Wan Zheng
- Department of Metallurgical & Materials Engineering, Colorado School of Mines, Golden, CO 80401 (USA)
| | - Liangju Kuang
- Department of Metallurgical & Materials Engineering, Colorado School of Mines, Golden, CO 80401 (USA)
| | - Suchithranga M D C Perera
- Department of Chemistry & Biochemistry, Department of Physics University of Arizona, Tucson, AZ 85721 (USA)
| | - Michael C Pitman
- Department of Chemistry & Biochemistry, Department of Physics University of Arizona, Tucson, AZ 85721 (USA)
| | - Michael F Brown
- Department of Chemistry & Biochemistry, Department of Physics University of Arizona, Tucson, AZ 85721 (USA).
| | - Hongjun Liang
- Department of Metallurgical & Materials Engineering, Colorado School of Mines, Golden, CO 80401 (USA).
- Current address: Department of Cell Physiology and Molecular Biophysics, Center for Membrane Protein Research, Texas Tech, University Health Science Center, Lubbock, TX 79430 (USA).
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25
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He W, Ma J, Shu X, Qian J, Hua D. Reconstitution of bacteriorhodopsin with cationic poly(dimethylaminoethyl acrylate)-block-poly(methylacrylate) for bio-hybrid materials. RSC Adv 2016. [DOI: 10.1039/c5ra21680j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A kind of cationic amphiphilic copolymer was synthesized for supporting membrane proteins to prepare bio-hybrid materials.
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Affiliation(s)
- Weiwei He
- School of Radiological and Interdisciplinary Sciences (RAD-X)
- Soochow University
- Collaborative Innovation Center of Radiological Medicine of Jiangsu Higher Education Institutions
- Suzhou 215123
- China
| | - Jiaqi Ma
- College of Chemistry
- Chemical Engineering and Materials Science
- Suzhou 215123
- China
| | - Xiaowen Shu
- School of Radiological and Interdisciplinary Sciences (RAD-X)
- Soochow University
- Collaborative Innovation Center of Radiological Medicine of Jiangsu Higher Education Institutions
- Suzhou 215123
- China
| | - Jun Qian
- College of Chemistry
- Chemical Engineering and Materials Science
- Suzhou 215123
- China
| | - Daoben Hua
- School of Radiological and Interdisciplinary Sciences (RAD-X)
- Soochow University
- Collaborative Innovation Center of Radiological Medicine of Jiangsu Higher Education Institutions
- Suzhou 215123
- China
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26
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Ward ME, Wang S, Munro R, Ritz E, Hung I, Gor'kov PL, Jiang Y, Liang H, Brown LS, Ladizhansky V. In situ structural studies of Anabaena sensory rhodopsin in the E. coli membrane. Biophys J 2016; 108:1683-1696. [PMID: 25863060 DOI: 10.1016/j.bpj.2015.02.018] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2014] [Revised: 12/18/2014] [Accepted: 02/12/2015] [Indexed: 01/06/2023] Open
Abstract
Magic-angle spinning nuclear magnetic resonance is well suited for the study of membrane proteins in the nativelike lipid environment. However, the natural cellular membrane is invariably more complex than the proteoliposomes most often used for solid-state NMR (SSNMR) studies, and differences may affect the structure and dynamics of the proteins under examination. In this work we use SSNMR and other biochemical and biophysical methods to probe the structure of a seven-transmembrane helical photoreceptor, Anabaena sensory rhodopsin (ASR), prepared in the Escherichia coli inner membrane, and compare it to that in a bilayer formed by DMPC/DMPA lipids. We find that ASR is organized into trimers in both environments but forms two-dimensional crystal lattices of different symmetries. It favors hexagonal packing in liposomes, but may form a square lattice in the E. coli membrane. To examine possible changes in structure site-specifically, we perform two- and three-dimensional SSNMR experiments and analyze the differences in chemical shifts and peak intensities. Overall, this analysis reveals that the structure of ASR is largely conserved in the inner membrane of E. coli, with many of the important structural features of rhodopsins previously observed in ASR in proteoliposomes being preserved. Small, site-specific perturbations in protein structure that occur as a result of the membrane changes indicate that the protein can subtly adapt to its environment without large structural rearrangement.
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Affiliation(s)
- Meaghan E Ward
- Department of Physics, University of Guelph, Guelph, Ontario, Canada; Biophysics Interdepartmental Group, University of Guelph, Guelph, Ontario, Canada
| | - Shenlin Wang
- Department of Physics, University of Guelph, Guelph, Ontario, Canada; Biophysics Interdepartmental Group, University of Guelph, Guelph, Ontario, Canada
| | - Rachel Munro
- Department of Physics, University of Guelph, Guelph, Ontario, Canada; Biophysics Interdepartmental Group, University of Guelph, Guelph, Ontario, Canada
| | - Emily Ritz
- Department of Physics, University of Guelph, Guelph, Ontario, Canada
| | - Ivan Hung
- National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida
| | - Peter L Gor'kov
- National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida
| | - Yunjiang Jiang
- Department of Metallurgical and Materials Engineering, Colorado School of Mines, Golden, Colorado
| | - Hongjun Liang
- Department of Metallurgical and Materials Engineering, Colorado School of Mines, Golden, Colorado
| | - Leonid S Brown
- Department of Physics, University of Guelph, Guelph, Ontario, Canada; Biophysics Interdepartmental Group, University of Guelph, Guelph, Ontario, Canada.
| | - Vladimir Ladizhansky
- Department of Physics, University of Guelph, Guelph, Ontario, Canada; Biophysics Interdepartmental Group, University of Guelph, Guelph, Ontario, Canada.
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27
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Chawla U, Jiang Y, Zheng W, Kuang L, Perera SMDC, Pitman MC, Brown MF, Liang H. A Usual G-Protein-Coupled Receptor in Unusual Membranes. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201508648] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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28
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Habel J, Ogbonna A, Larsen N, Schulte L, Almdal K, Hélix-Nielsen C. How molecular internal-geometric parameters affect PB-PEO polymersome size in aqueous solution. ACTA ACUST UNITED AC 2015. [DOI: 10.1002/polb.23954] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Joachim Habel
- Department of Environmental Engineering; Technical University of Denmark; Miljøvej, Building 113, 2800 Kgs. Lyngby Denmark
- Aquaporin A/S; Ole Maaløes Vej 3 2200 Copenhagen Denmark
| | - Anayo Ogbonna
- Aquaporin A/S; Ole Maaløes Vej 3 2200 Copenhagen Denmark
| | - Nanna Larsen
- University of Copenhagen, Copenhagen Biocenter; Ole Maaløes Vej 5 2200 Copenhagen Denmark
| | - Lars Schulte
- Department of Micro- and Nanotechnology; Technical University of Denmark; Produktionstorvet, Building 423, 2800 Kgs Lyngby Denmark
| | - Kristoffer Almdal
- Department of Micro- and Nanotechnology; Technical University of Denmark; Produktionstorvet, Building 423, 2800 Kgs Lyngby Denmark
| | - Claus Hélix-Nielsen
- Department of Environmental Engineering; Technical University of Denmark; Miljøvej, Building 113, 2800 Kgs. Lyngby Denmark
- Aquaporin A/S; Ole Maaløes Vej 3 2200 Copenhagen Denmark
- Laboratory for Water Biophysics and Membrane Processes, Faculty of Chemistry and Chemical Engineering; University of Maribor; Smetanova Ulica 17 2000 Maribor Slovenia
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29
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Synthesis of poly(sulfobetaine methacrylate)-grafted chitosan under γ-ray irradiation for alamethicin assembly. Colloids Surf B Biointerfaces 2015; 132:132-7. [DOI: 10.1016/j.colsurfb.2015.05.019] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2015] [Revised: 05/08/2015] [Accepted: 05/11/2015] [Indexed: 11/21/2022]
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30
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Habel J, Hansen M, Kynde S, Larsen N, Midtgaard SR, Jensen GV, Bomholt J, Ogbonna A, Almdal K, Schulz A, Hélix-Nielsen C. Aquaporin-Based Biomimetic Polymeric Membranes: Approaches and Challenges. MEMBRANES 2015; 5:307-51. [PMID: 26264033 PMCID: PMC4584284 DOI: 10.3390/membranes5030307] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/08/2015] [Accepted: 07/22/2015] [Indexed: 12/12/2022]
Abstract
In recent years, aquaporin biomimetic membranes (ABMs) for water separation have gained considerable interest. Although the first ABMs are commercially available, there are still many challenges associated with further ABM development. Here, we discuss the interplay of the main components of ABMs: aquaporin proteins (AQPs), block copolymers for AQP reconstitution, and polymer-based supporting structures. First, we briefly cover challenges and review recent developments in understanding the interplay between AQP and block copolymers. Second, we review some experimental characterization methods for investigating AQP incorporation including freeze-fracture transmission electron microscopy, fluorescence correlation spectroscopy, stopped-flow light scattering, and small-angle X-ray scattering. Third, we focus on recent efforts in embedding reconstituted AQPs in membrane designs that are based on conventional thin film interfacial polymerization techniques. Finally, we describe some new developments in interfacial polymerization using polyhedral oligomeric silsesquioxane cages for increasing the physical and chemical durability of thin film composite membranes.
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Affiliation(s)
- Joachim Habel
- Technical University of Denmark, Department of Environmental Engineering, Miljøvej, Building 113, 2800 Kgs. Lyngby, Denmark.
- Aquaporin A/S, Ole Maaløes Vej 3, 2200 Copenhagen, Denmark.
| | - Michael Hansen
- University of Copenhagen, Department of Plant and Environmental Sciences, Thorvaldsensvej 40, 1871 Frederiksberg, Denmark.
| | - Søren Kynde
- University of Copenhagen, Copenhagen Biocenter, Ole Maaløes Vej 5, 2200 Copenhagen, Denmark.
| | - Nanna Larsen
- University of Copenhagen, Niels Bohr Institute, Hans Christian Ørsted building D, Universitetsparken, 5, 2100 Copenhagen, Denmark.
| | - Søren Roi Midtgaard
- University of Copenhagen, Copenhagen Biocenter, Ole Maaløes Vej 5, 2200 Copenhagen, Denmark.
| | | | - Julie Bomholt
- Aquaporin A/S, Ole Maaløes Vej 3, 2200 Copenhagen, Denmark.
| | - Anayo Ogbonna
- Aquaporin A/S, Ole Maaløes Vej 3, 2200 Copenhagen, Denmark.
| | - Kristoffer Almdal
- Technical University of Denmark, Department of Micro- and Nanotechnology, Produktionstorvet, Building 423, 2800 Kgs. Lyngby.
| | - Alexander Schulz
- University of Copenhagen, Department of Plant and Environmental Sciences, Thorvaldsensvej 40, 1871 Frederiksberg, Denmark.
| | - Claus Hélix-Nielsen
- Technical University of Denmark, Department of Environmental Engineering, Miljøvej, Building 113, 2800 Kgs. Lyngby, Denmark.
- Aquaporin A/S, Ole Maaløes Vej 3, 2200 Copenhagen, Denmark.
- University of Maribor, Laboratory for Water Biophysics and Membrane Processes, Faculty of Chemistry and Chemical Engineering, Smetanova ulica 17, 2000 Maribor, Slovenia.
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31
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Wang L, Roth JS, Han X, Evans SD. Photosynthetic Proteins in Supported Lipid Bilayers: Towards a Biokleptic Approach for Energy Capture. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2015; 11:3306-3318. [PMID: 25727786 DOI: 10.1002/smll.201403469] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/21/2014] [Revised: 01/11/2015] [Indexed: 06/04/2023]
Abstract
In nature, plants and some bacteria have evolved an ability to convert solar energy into chemical energy usable by the organism. This process involves several proteins and the creation of a chemical gradient across the cell membrane. To transfer this process to a laboratory environment, several conditions have to be met: i) proteins need to be reconstituted into a lipid membrane, ii) the proteins need to be correctly oriented and functional and, finally, iii) the lipid membrane should be capable of maintaining chemical and electrical gradients. Investigating the processes of photosynthesis and energy generation in vivo is a difficult task due to the complexity of the membrane and its associated proteins. Solid, supported lipid bilayers provide a good model system for the systematic investigation of the different components involved in the photosynthetic pathway. In this review, the progress made to date in the development of supported lipid bilayer systems suitable for the investigation of membrane proteins is described; in particular, there is a focus on those used for the reconstitution of proteins involved in light capture.
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Affiliation(s)
- Lei Wang
- School of Physics and Astronomy, University of Leeds, Leeds, LS2 9JT, UK
- State Key Laboratory of Urban Water Resource and Environment, School of Chemical Engineering and Technology, Harbin Institute of Technology, Harbin, 150001, China
| | - Johannes S Roth
- School of Physics and Astronomy, University of Leeds, Leeds, LS2 9JT, UK
| | - Xiaojun Han
- State Key Laboratory of Urban Water Resource and Environment, School of Chemical Engineering and Technology, Harbin Institute of Technology, Harbin, 150001, China
| | - Stephen D Evans
- School of Physics and Astronomy, University of Leeds, Leeds, LS2 9JT, UK
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32
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Habel J, Ogbonna A, Larsen N, Cherré S, Kynde S, Midtgaard SR, Kinoshita K, Krabbe S, Jensen GV, Hansen JS, Almdal K, Hèlix-Nielsen C. Selecting analytical tools for characterization of polymersomes in aqueous solution. RSC Adv 2015. [DOI: 10.1039/c5ra16403f] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
We present 17 techniques to analyze polymersomes, in terms of their size, bilayer properties, elastic properties or surface charge.
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Affiliation(s)
- Joachim Habel
- Technical University of Denmark
- Department of Environmental Engineering
- 2800 Kgs. Lyngby
- Denmark
- Aquaporin A/S
| | | | - Nanna Larsen
- University of Copenhagen
- Copenhagen Biocenter
- 2200 Copenhagen
- Denmark
| | - Solène Cherré
- Technical University of Denmark
- Department of Micro- and Nanotechnology
- 2800 Kgs. Lyngby
- Denmark
| | - Søren Kynde
- University of Copenhagen
- Niels Bohr Institute
- 2100 Copenhagen
- Denmark
| | | | - Koji Kinoshita
- University of Southern Denmark
- Department of Physics
- Chemistry and Pharmacy
- 5230 Odense
- Denmark
| | - Simon Krabbe
- University of Copenhagen
- Department of Biology
- 2100 Copenhagen
- Denmark
| | | | | | - Kristoffer Almdal
- Technical University of Denmark
- Department of Micro- and Nanotechnology
- 2800 Kgs. Lyngby
- Denmark
| | - Claus Hèlix-Nielsen
- Technical University of Denmark
- Department of Environmental Engineering
- 2800 Kgs. Lyngby
- Denmark
- Aquaporin A/S
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Kuang L, Olson TL, Lin S, Flores M, Jiang Y, Zheng W, Williams JC, Allen JP, Liang H. Interface for Light-Driven Electron Transfer by Photosynthetic Complexes Across Block Copolymer Membranes. J Phys Chem Lett 2014; 5:787-791. [PMID: 26274068 DOI: 10.1021/jz402766y] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Incorporation of membrane proteins into nanodevices to mediate recognition and transport in a collective and scalable fashion remains a challenging problem. We demonstrate how nanoscale photovoltaics could be designed using robust synthetic nanomembranes with incorporated photosynthetic reaction centers (RCs). Specifically, RCs from Rhodobacter sphaeroides are reconstituted spontaneously into rationally designed polybutadiene membranes to form hierarchically organized proteopolymer membrane arrays via a charge-interaction-directed reconstitution mechanism. Once incorporated, the RCs are fully active for prolonged periods based upon a variety of spectroscopic measurements, underscoring preservation of their 3D pigment configuration critical for light-driven charge transfer. This result provides a strategy to construct solar conversion devices using structurally versatile proteopolymer membranes with integrated RC functions to harvest broad regions of the solar spectrum.
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Affiliation(s)
- Liangju Kuang
- †Department of Metallurgical and Materials Engineering, Colorado School of Mines, Golden, Colorado 80401, United States
| | - Tien L Olson
- ‡Department of Chemistry and Biochemistry, Arizona State University, Tempe, Arizona 85287, United States
| | - Su Lin
- ‡Department of Chemistry and Biochemistry, Arizona State University, Tempe, Arizona 85287, United States
| | - Marco Flores
- ‡Department of Chemistry and Biochemistry, Arizona State University, Tempe, Arizona 85287, United States
| | - Yunjiang Jiang
- †Department of Metallurgical and Materials Engineering, Colorado School of Mines, Golden, Colorado 80401, United States
| | - Wan Zheng
- †Department of Metallurgical and Materials Engineering, Colorado School of Mines, Golden, Colorado 80401, United States
| | - JoAnn C Williams
- ‡Department of Chemistry and Biochemistry, Arizona State University, Tempe, Arizona 85287, United States
| | - James P Allen
- ‡Department of Chemistry and Biochemistry, Arizona State University, Tempe, Arizona 85287, United States
| | - Hongjun Liang
- †Department of Metallurgical and Materials Engineering, Colorado School of Mines, Golden, Colorado 80401, United States
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