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Ardalan A, Sowlati-Hashjin S, Uwumarenogie SO, Fish M, Mitchell J, Karttunen M, Smith MD, Jelokhani-Niaraki M. Functional Oligomeric Forms of Uncoupling Protein 2: Strong Evidence for Asymmetry in Protein and Lipid Bilayer Systems. J Phys Chem B 2020; 125:169-183. [PMID: 33373220 DOI: 10.1021/acs.jpcb.0c09422] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Stoichiometry of uncoupling proteins (UCPs) and their coexistence as functional monomeric and associated forms in lipid membranes remain intriguing open questions. In this study, tertiary and quaternary structures of UCP2 were analyzed experimentally and through molecular dynamics (MD) simulations. UCP2 was overexpressed in the inner membrane of Escherichia coli, then purified and reconstituted in lipid vesicles. Structure and proton transport function of UCP2 were characterized by circular dichroism (CD) spectroscopy and fluorescence methods. Findings suggest a tetrameric functional form for UCP2. MD simulations conclude that tetrameric UCP2 is a dimer of dimers, is more stable than its monomeric and dimeric forms, is asymmetrical and induces asymmetry in the membrane's lipid structure, and a biphasic on-off switch between the dimeric units is its possible mode of transport. MD simulations also show that the water density inside the UCP2 monomer is asymmetric, with the cytoplasmic side having a higher water density and a wider radius. In contrast, the structurally comparable adenosine 5'-diphosphate (ADP)/adenosine 5'-triphosphate (ATP) carrier (AAC1) did not form tetramers, implying that tetramerization cannot be generalized to all mitochondrial carriers.
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Affiliation(s)
- Afshan Ardalan
- Department of Chemistry and Biochemistry, Wilfrid Laurier University, Waterloo, Ontario, Canada N2L 3C5
| | - Shahin Sowlati-Hashjin
- Department of Chemistry, The University of Western Ontario, London, Ontario, Canada N6A 3K7.,Center for Advanced Materials and Biomaterials Research, The University of Western Ontario, London, Ontario, Canada N6K 3K7
| | - Stephanie O Uwumarenogie
- Department of Chemistry and Biochemistry, Wilfrid Laurier University, Waterloo, Ontario, Canada N2L 3C5
| | - Michael Fish
- Department of Chemistry and Biochemistry, Wilfrid Laurier University, Waterloo, Ontario, Canada N2L 3C5.,Department of Biology, Wilfrid Laurier University, Waterloo, Ontario, Canada N2L 3C5
| | - Joel Mitchell
- Department of Chemistry and Biochemistry, Wilfrid Laurier University, Waterloo, Ontario, Canada N2L 3C5
| | - Mikko Karttunen
- Department of Chemistry, The University of Western Ontario, London, Ontario, Canada N6A 3K7.,Center for Advanced Materials and Biomaterials Research, The University of Western Ontario, London, Ontario, Canada N6K 3K7.,Department of Applied Mathematics, The University of Western Ontario, London, Ontario, Canada N6A 5B7
| | - Matthew D Smith
- Department of Biology, Wilfrid Laurier University, Waterloo, Ontario, Canada N2L 3C5
| | - Masoud Jelokhani-Niaraki
- Department of Chemistry and Biochemistry, Wilfrid Laurier University, Waterloo, Ontario, Canada N2L 3C5
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Puiggalí-Jou A, Del Valle LJ, Alemán C. Biomimetic hybrid membranes: incorporation of transport proteins/peptides into polymer supports. SOFT MATTER 2019; 15:2722-2736. [PMID: 30869096 DOI: 10.1039/c8sm02513d] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Molecular sensing, water purification and desalination, drug delivery, and DNA sequencing are some striking applications of biomimetic hybrid membranes. These devices take advantage of biomolecules, which have gained excellence in their specificity and efficiency during billions of years, and of artificial materials that load the purified biological molecules and provide technological properties, such as robustness, scalability, and suitable nanofeatures to confine the biomolecules. Recent methodological advances allow more precise control of polymer membranes that support the biomacromolecules, and are expected to improve the design of the next generation of membranes as well as their applicability. In the first section of this review we explain the biological relevance of membranes, membrane proteins, and the classification used for the latter. After this, we critically analyse the different approaches employed for the production of highly selective hybrid membranes, focusing on novel materials made of self-assembled block copolymers and nanostructured polymers. Finally, a summary of the advantages and disadvantages of the different methodologies is presented and the main characteristics of biomimetic hybrid membranes are highlighted.
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Affiliation(s)
- Anna Puiggalí-Jou
- Departament d'Enginyeria Química, EEBE, Universitat Politècnica de Catalunya, C/Eduard Maristany, 10-14, Ed. I2, 08019, Barcelona, Spain. and Barcelona Research Center for Multiscale Science and Engineering, Universitat Politècnica de Catalunya, C/Eduard Maristany, 10-14, Ed. C, 08019, Barcelona, Spain
| | - Luis J Del Valle
- Departament d'Enginyeria Química, EEBE, Universitat Politècnica de Catalunya, C/Eduard Maristany, 10-14, Ed. I2, 08019, Barcelona, Spain. and Barcelona Research Center for Multiscale Science and Engineering, Universitat Politècnica de Catalunya, C/Eduard Maristany, 10-14, Ed. C, 08019, Barcelona, Spain
| | - Carlos Alemán
- Departament d'Enginyeria Química, EEBE, Universitat Politècnica de Catalunya, C/Eduard Maristany, 10-14, Ed. I2, 08019, Barcelona, Spain. and Barcelona Research Center for Multiscale Science and Engineering, Universitat Politècnica de Catalunya, C/Eduard Maristany, 10-14, Ed. C, 08019, Barcelona, Spain
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Lopes-Rodrigues M, Zanuy D, Alemán C, Michaux C, Perpète EA. 3D structure of a Brucella melitensis porin: molecular modelling in lipid membranes. J Biomol Struct Dyn 2018; 37:3923-3935. [DOI: 10.1080/07391102.2018.1529627] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Maximilien Lopes-Rodrigues
- Laboratoire de Chimie Physique des Biomolécules, Unité de Chimie Physique Théorique et Structurale (UCPTS), University of Namur, Namur, Belgium
- Namur Institute of Structured Matter, University of Namur, Namur, Belgium
- Departament d’Enginyeria Química, EEBE, Universitat Politècnica de Catalunya, Barcelona, Spain
- Barcelona Research Center for Multiscale Science and Engineering, Universitat Politècnica de Catalunya, Barcelona, Spain
| | - David Zanuy
- Departament d’Enginyeria Química, EEBE, Universitat Politècnica de Catalunya, Barcelona, Spain
| | - Carlos Alemán
- Departament d’Enginyeria Química, EEBE, Universitat Politècnica de Catalunya, Barcelona, Spain
- Barcelona Research Center for Multiscale Science and Engineering, Universitat Politècnica de Catalunya, Barcelona, Spain
| | - Catherine Michaux
- Laboratoire de Chimie Physique des Biomolécules, Unité de Chimie Physique Théorique et Structurale (UCPTS), University of Namur, Namur, Belgium
- Namur Institute of Structured Matter, University of Namur, Namur, Belgium
- Namur Research Institute for Life Sciences, University of Namur, Namur, Belgium
| | - Eric A. Perpète
- Laboratoire de Chimie Physique des Biomolécules, Unité de Chimie Physique Théorique et Structurale (UCPTS), University of Namur, Namur, Belgium
- Namur Institute of Structured Matter, University of Namur, Namur, Belgium
- Institute of Life-Earth-Environment, University of Namur, Namur, Belgium
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