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Makarchuk I, Gerasimova T, Kägi J, Wohlwend D, Melin F, Friedrich T, Hellwig P. Mutating the environment of heme b 595 of E. coli cytochrome bd-I oxidase shifts its redox potential by 200 mV without inactivating the enzyme. Bioelectrochemistry 2023; 151:108379. [PMID: 36736178 DOI: 10.1016/j.bioelechem.2023.108379] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2022] [Revised: 01/11/2023] [Accepted: 01/22/2023] [Indexed: 01/31/2023]
Abstract
Cytochrome bd-I catalyzes the reduction of oxygen to water with the aid of hemes b558, b595 and d. Here, effects of a mutation of E445, a ligand of heme b595 and of R448, hydrogen bonded to E445 are studied electrochemically in the E. coli enzyme. The equilibrium potential of the three hemes are shifted by up to 200 mV in these mutants. Strikingly the E445D and the R448N mutants show a turnover of 41 ± 2 % and 20 ± 4 %, respectively. Electrocatalytic studies confirm that the mutants react with oxygen and bind and release NO. These results point towards the ability of cytochrome bd to react even if the electron transfer is less favorable.
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Affiliation(s)
- Iryna Makarchuk
- Laboratoire de Bioélectrochimie et Spectroscopie, UMR 7140, Chimie de la Matière Complexe, Université de Strasbourg-CNRS, 67000 Strasbourg, France; Institut für Biochemie, Albert-Ludwigs-Universität Freiburg, Albertstr 21, 79104 Freiburg, Germany
| | - Tatjana Gerasimova
- Laboratoire de Bioélectrochimie et Spectroscopie, UMR 7140, Chimie de la Matière Complexe, Université de Strasbourg-CNRS, 67000 Strasbourg, France; Institut für Biochemie, Albert-Ludwigs-Universität Freiburg, Albertstr 21, 79104 Freiburg, Germany
| | - Jan Kägi
- Laboratoire de Bioélectrochimie et Spectroscopie, UMR 7140, Chimie de la Matière Complexe, Université de Strasbourg-CNRS, 67000 Strasbourg, France; Institut für Biochemie, Albert-Ludwigs-Universität Freiburg, Albertstr 21, 79104 Freiburg, Germany
| | - Daniel Wohlwend
- Laboratoire de Bioélectrochimie et Spectroscopie, UMR 7140, Chimie de la Matière Complexe, Université de Strasbourg-CNRS, 67000 Strasbourg, France; Institut für Biochemie, Albert-Ludwigs-Universität Freiburg, Albertstr 21, 79104 Freiburg, Germany
| | - Frédéric Melin
- Laboratoire de Bioélectrochimie et Spectroscopie, UMR 7140, Chimie de la Matière Complexe, Université de Strasbourg-CNRS, 67000 Strasbourg, France; Institut für Biochemie, Albert-Ludwigs-Universität Freiburg, Albertstr 21, 79104 Freiburg, Germany
| | - Thorsten Friedrich
- Laboratoire de Bioélectrochimie et Spectroscopie, UMR 7140, Chimie de la Matière Complexe, Université de Strasbourg-CNRS, 67000 Strasbourg, France; Institut für Biochemie, Albert-Ludwigs-Universität Freiburg, Albertstr 21, 79104 Freiburg, Germany
| | - Petra Hellwig
- Laboratoire de Bioélectrochimie et Spectroscopie, UMR 7140, Chimie de la Matière Complexe, Université de Strasbourg-CNRS, 67000 Strasbourg, France; Institut für Biochemie, Albert-Ludwigs-Universität Freiburg, Albertstr 21, 79104 Freiburg, Germany.
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Nikolaev A, Safarian S, Thesseling A, Wohlwend D, Friedrich T, Michel H, Kusumoto T, Sakamoto J, Melin F, Hellwig P. Electrocatalytic evidence of the diversity of the oxygen reaction in the bacterial bd oxidase from different organisms. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 2021; 1862:148436. [PMID: 33940039 DOI: 10.1016/j.bbabio.2021.148436] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 12/03/2020] [Revised: 04/16/2021] [Accepted: 04/21/2021] [Indexed: 11/30/2022]
Abstract
Cytochrome bd oxidase is a bacterial terminal oxygen reductase that was suggested to enable adaptation to different environments and to confer resistance to stress conditions. An electrocatalytic study of the cyt bd oxidases from Escherichia coli, Corynebacterium glutamicum and Geobacillus thermodenitrificans gives evidence for a different reactivity towards oxygen. An inversion of the redox potential values of the three hemes is found when comparing the enzymes from different bacteria. This inversion can be correlated with different protonated glutamic acids as evidenced by reaction induced FTIR spectroscopy. The influence of the microenvironment of the hemes on the reactivity towards oxygen is discussed.
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Affiliation(s)
- Anton Nikolaev
- Laboratoire de Bioélectrochimie et Spectroscopie, UMR 7140, Chimie de la Matière Complexe, Université de Strasbourg - CNRS 4, rue Blaise Pascal, 67081 Strasborg, France
| | - Schara Safarian
- Max Planck Institute of Biophysics, Frankfurt am Main, Germany
| | | | - Daniel Wohlwend
- Institut für Biochemie, Albert-Ludwigs-Universität Freiburg, Freiburg, Germany
| | - Thorsten Friedrich
- Institut für Biochemie, Albert-Ludwigs-Universität Freiburg, Freiburg, Germany
| | - Hartmut Michel
- Max Planck Institute of Biophysics, Frankfurt am Main, Germany
| | - Tomoichirou Kusumoto
- Department of Bioscience and Bioinformatics, Kyushu Institute of Technology, 680-4 Kawazu, Fukuoka, Japan
| | - Junshi Sakamoto
- Department of Bioscience and Bioinformatics, Kyushu Institute of Technology, 680-4 Kawazu, Fukuoka, Japan
| | - Frederic Melin
- Laboratoire de Bioélectrochimie et Spectroscopie, UMR 7140, Chimie de la Matière Complexe, Université de Strasbourg - CNRS 4, rue Blaise Pascal, 67081 Strasborg, France.
| | - Petra Hellwig
- Laboratoire de Bioélectrochimie et Spectroscopie, UMR 7140, Chimie de la Matière Complexe, Université de Strasbourg - CNRS 4, rue Blaise Pascal, 67081 Strasborg, France; USIAS, University of Strasbourg Institute for Advanced Studies, Strasbourg, France.
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Abstract
Transmembrane proteins involved in metabolic redox reactions and photosynthesis catalyse a plethora of key energy-conversion processes and are thus of great interest for bioelectrocatalysis-based applications. The development of membrane protein modified electrodes has made it possible to efficiently exchange electrons between proteins and electrodes, allowing mechanistic studies and potentially applications in biofuels generation and energy conversion. Here, we summarise the most common electrode modification and their characterisation techniques for membrane proteins involved in biofuels conversion and semi-artificial photosynthesis. We discuss the challenges of applications of membrane protein modified electrodes for bioelectrocatalysis and comment on emerging methods and future directions, including recent advances in membrane protein reconstitution strategies and the development of microbial electrosynthesis and whole-cell semi-artificial photosynthesis.
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