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Rokitskaya TI, Alekseev AA, Tsybrov FM, Bukhalovich SM, Antonenko YN, Gordeliy VI. Retinal-Based Anion Pump from the Cyanobacterium Tolypothrix campylonemoides. BIOCHEMISTRY. BIOKHIMIIA 2023; 88:1571-1579. [PMID: 38105025 DOI: 10.1134/s0006297923100127] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/30/2023] [Revised: 09/15/2023] [Accepted: 09/15/2023] [Indexed: 12/19/2023]
Abstract
In this work, TcaR rhodopsin from the cyanobacterium Tolypothrix campylonemoides was characterized. Analysis of the amino acid sequence of TcaR revealed that this protein possesses a TSD motif that differs by only one amino acid from the TSA motif of the known halorhodopsin chloride pump. The TcaR protein was expressed in E. coli, purified, and incorporated into proteoliposomes and nanodiscs. Functional activity was measured by electric current generation through the planar bilayer lipid membranes (BLMs) with proteoliposomes adsorbed on one side of the membrane surface, as well as by fluorescence using the voltage-dependent dye oxonol VI. We have shown that TcaR rhodopsin functions as a powerful anion pump. Our results show that the novel microbial anion transporter, TcaR, deserves deeper investigation and may be of interest both for fundamental studies of membrane proteins and as a tool for optogenetics.
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Affiliation(s)
- Tatyana I Rokitskaya
- Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, Moscow, 119991, Russia.
| | - Aleksey A Alekseev
- Moscow Institute of Physics and Technology, Dolgoprudny, Moscow Region, 141701, Russia
| | - Fedor M Tsybrov
- Moscow Institute of Physics and Technology, Dolgoprudny, Moscow Region, 141701, Russia
| | - Sergej M Bukhalovich
- Moscow Institute of Physics and Technology, Dolgoprudny, Moscow Region, 141701, Russia
| | - Yuri N Antonenko
- Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, Moscow, 119991, Russia.
| | - Valentin I Gordeliy
- Institut de Biologie Structurale (IBS), Université Grenoble Alpes, CEA, CNRS, Grenoble, France.
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Kovalev K, Tsybrov F, Alekseev A, Shevchenko V, Soloviov D, Siletsky S, Bourenkov G, Agthe M, Nikolova M, von Stetten D, Astashkin R, Bukhdruker S, Chizhov I, Royant A, Kuzmin A, Gushchin I, Rosselli R, Rodriguez-Valera F, Ilyinskiy N, Rogachev A, Borshchevskiy V, Schneider TR, Bamberg E, Gordeliy V. Mechanisms of inward transmembrane proton translocation. Nat Struct Mol Biol 2023:10.1038/s41594-023-01020-9. [PMID: 37386213 DOI: 10.1038/s41594-023-01020-9] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2022] [Accepted: 05/15/2023] [Indexed: 07/01/2023]
Abstract
Proton transport is indispensable for cell life. It is believed that molecular mechanisms of proton movement through different types of proton-conducting molecules have general universal features. However, elucidation of such mechanisms is a challenge. It requires true-atomic-resolution structures of all key proton-conducting states. Here we present a comprehensive function-structure study of a light-driven bacterial inward proton pump, xenorhodopsin, from Bacillus coahuilensis in all major proton-conducting states. The structures reveal that proton translocation is based on proton wires regulated by internal gates. The wires serve as both selectivity filters and translocation pathways for protons. The cumulative results suggest a general concept of proton translocation. We demonstrate the use of serial time-resolved crystallography at a synchrotron source with sub-millisecond resolution for rhodopsin studies, opening the door for principally new applications. The results might also be of interest for optogenetics since xenorhodopsins are the only alternative tools to fire neurons.
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Affiliation(s)
- Kirill Kovalev
- European Molecular Biology Laboratory, Hamburg unit c/o DESY, Hamburg, Germany
| | - Fedor Tsybrov
- Research Center for Molecular Mechanisms of Aging and Age-Related Diseases, Moscow Institute of Physics and Technology, Dolgoprudny, Russia
| | - Alexey Alekseev
- Research Center for Molecular Mechanisms of Aging and Age-Related Diseases, Moscow Institute of Physics and Technology, Dolgoprudny, Russia
- Institute for Auditory Neuroscience and InnerEarLab, University Medical Center Göttingen, Göttingen, Germany
| | - Vitaly Shevchenko
- Research Center for Molecular Mechanisms of Aging and Age-Related Diseases, Moscow Institute of Physics and Technology, Dolgoprudny, Russia
| | - Dmytro Soloviov
- European Molecular Biology Laboratory, Hamburg unit c/o DESY, Hamburg, Germany
| | - Sergey Siletsky
- Belozersky Institute of Physical-Chemical Biology, Lomonosov Moscow State University, Moscow, Russian Federation
| | - Gleb Bourenkov
- European Molecular Biology Laboratory, Hamburg unit c/o DESY, Hamburg, Germany
| | - Michael Agthe
- European Molecular Biology Laboratory, Hamburg unit c/o DESY, Hamburg, Germany
| | - Marina Nikolova
- European Molecular Biology Laboratory, Hamburg unit c/o DESY, Hamburg, Germany
| | - David von Stetten
- European Molecular Biology Laboratory, Hamburg unit c/o DESY, Hamburg, Germany
| | - Roman Astashkin
- Univ. Grenoble Alpes, CEA, CNRS, Institut de Biologie Structurale (IBS), Grenoble, France
| | - Sergey Bukhdruker
- Research Center for Molecular Mechanisms of Aging and Age-Related Diseases, Moscow Institute of Physics and Technology, Dolgoprudny, Russia
| | - Igor Chizhov
- Institute for Biophysical Chemistry, Hannover Medical School, Hannover, Germany
| | - Antoine Royant
- Univ. Grenoble Alpes, CEA, CNRS, Institut de Biologie Structurale (IBS), Grenoble, France
| | - Alexander Kuzmin
- Research Center for Molecular Mechanisms of Aging and Age-Related Diseases, Moscow Institute of Physics and Technology, Dolgoprudny, Russia
| | - Ivan Gushchin
- Research Center for Molecular Mechanisms of Aging and Age-Related Diseases, Moscow Institute of Physics and Technology, Dolgoprudny, Russia
| | - Riccardo Rosselli
- Dpto. Fisiología, Genética y Microbiología, Universidad de Alicante, Alicante, Spain
| | - Francisco Rodriguez-Valera
- Research Center for Molecular Mechanisms of Aging and Age-Related Diseases, Moscow Institute of Physics and Technology, Dolgoprudny, Russia
- Evolutionary Genomics Group, Departamento de Produccion Vegetal y Microbiologıa, Universidad Miguel Hernandez, San Juan de Alicante, Alicante, Spain
| | - Nikolay Ilyinskiy
- Research Center for Molecular Mechanisms of Aging and Age-Related Diseases, Moscow Institute of Physics and Technology, Dolgoprudny, Russia
| | - Andrey Rogachev
- Research Center for Molecular Mechanisms of Aging and Age-Related Diseases, Moscow Institute of Physics and Technology, Dolgoprudny, Russia
- Joint Institute for Nuclear Research, Dubna, Russian Federation
| | - Valentin Borshchevskiy
- Research Center for Molecular Mechanisms of Aging and Age-Related Diseases, Moscow Institute of Physics and Technology, Dolgoprudny, Russia
- Joint Institute for Nuclear Research, Dubna, Russian Federation
| | - Thomas R Schneider
- European Molecular Biology Laboratory, Hamburg unit c/o DESY, Hamburg, Germany
| | - Ernst Bamberg
- Max Planck Institute of Biophysics, Frankfurt am Main, Germany
| | - Valentin Gordeliy
- Univ. Grenoble Alpes, CEA, CNRS, Institut de Biologie Structurale (IBS), Grenoble, France.
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