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Kooijman L, Schuster M, Baumann C, Jurt S, Löhr F, Fürtig B, Güntert P, Zerbe O. Dynamics of Bacteriorhodopsin in the Dark‐Adapted State from Solution Nuclear Magnetic Resonance Spectroscopy. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202004393] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Laurens Kooijman
- Department of Chemistry University of Zurich Winterthurerstrasse 190 CH-8057 Zurich Switzerland
| | - Matthias Schuster
- Department of Chemistry University of Zurich Winterthurerstrasse 190 CH-8057 Zurich Switzerland
| | - Christian Baumann
- Department of Chemistry University of Zurich Winterthurerstrasse 190 CH-8057 Zurich Switzerland
| | - Simon Jurt
- Department of Chemistry University of Zurich Winterthurerstrasse 190 CH-8057 Zurich Switzerland
| | - Frank Löhr
- Institute of Biophysical Chemistry Center for Biomolecular Magnetic Resonance Goethe University Frankfurt Max-von-Laue-Straße 9 60438 Frankfurt am Main Germany
| | - Boris Fürtig
- Institute of Organic Chemistry and Chemical Biology Goethe University Frankfurt Max-von-Laue-Straße 7 60438 Frankfurt am Main Germany
| | - Peter Güntert
- Institute of Biophysical Chemistry Center for Biomolecular Magnetic Resonance Goethe University Frankfurt Max-von-Laue-Straße 9 60438 Frankfurt am Main Germany
- Laboratory of Physical Chemistry ETH Zürich Vladimir-Prelog-Weg 2 8093 Zurich Switzerland
| | - Oliver Zerbe
- Department of Chemistry University of Zurich Winterthurerstrasse 190 CH-8057 Zurich Switzerland
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Kooijman L, Schuster M, Baumann C, Jurt S, Löhr F, Fürtig B, Güntert P, Zerbe O. Dynamics of Bacteriorhodopsin in the Dark-Adapted State from Solution Nuclear Magnetic Resonance Spectroscopy. Angew Chem Int Ed Engl 2020; 59:20965-20972. [PMID: 32726501 DOI: 10.1002/anie.202004393] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2020] [Revised: 07/15/2020] [Indexed: 01/02/2023]
Abstract
To achieve efficient proton pumping in the light-driven proton pump bacteriorhodopsin (bR), the protein must be tightly coupled to the retinal to rapidly convert retinal isomerization into protein structural rearrangements. Methyl group dynamics of bR embedded in lipid nanodiscs were determined in the dark-adapted state, and were found to be mostly well ordered at the cytosolic side. Methyl groups in the M145A mutant of bR, which displays only 10 % residual proton pumping activity, are less well ordered, suggesting a link between side-chain dynamics on the cytosolic side of the bR cavity and proton pumping activity. In addition, slow conformational exchange, attributed to low frequency motions of aromatic rings, was indirectly observed for residues on the extracellular side of the bR cavity. This may be related to reorganization of the water network. These observations provide a detailed picture of previously undescribed equilibrium dynamics on different time scales for ground-state bR.
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Affiliation(s)
- Laurens Kooijman
- Department of Chemistry, University of Zurich, Winterthurerstrasse 190, CH-8057, Zurich, Switzerland
| | - Matthias Schuster
- Department of Chemistry, University of Zurich, Winterthurerstrasse 190, CH-8057, Zurich, Switzerland
| | - Christian Baumann
- Department of Chemistry, University of Zurich, Winterthurerstrasse 190, CH-8057, Zurich, Switzerland
| | - Simon Jurt
- Department of Chemistry, University of Zurich, Winterthurerstrasse 190, CH-8057, Zurich, Switzerland
| | - Frank Löhr
- Institute of Biophysical Chemistry, Center for Biomolecular Magnetic Resonance, Goethe University Frankfurt, Max-von-Laue-Straße 9, 60438, Frankfurt am Main, Germany
| | - Boris Fürtig
- Institute of Organic Chemistry and Chemical Biology, Goethe University Frankfurt, Max-von-Laue-Straße 7, 60438, Frankfurt am Main, Germany
| | - Peter Güntert
- Institute of Biophysical Chemistry, Center for Biomolecular Magnetic Resonance, Goethe University Frankfurt, Max-von-Laue-Straße 9, 60438, Frankfurt am Main, Germany.,Laboratory of Physical Chemistry, ETH Zürich, Vladimir-Prelog-Weg 2, 8093, Zurich, Switzerland
| | - Oliver Zerbe
- Department of Chemistry, University of Zurich, Winterthurerstrasse 190, CH-8057, Zurich, Switzerland
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