A mechanism to prevent production of reactive oxygen species by Escherichia coli respiratory complex I

Marius Schulte, Klaudia Frick, Emmanuel Gnandt, Sascha Jurkovic, Sabrina Burschel, Ramona Labatzke, Karoline Aierstock, Dennis Fiegen, Daniel Wohlwend, Stefan Gerhardt, Oliver Einsle and Thorsten Friedrich ()
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Marius Schulte: Albert-Ludwigs-Universität Freiburg
Klaudia Frick: Albert-Ludwigs-Universität Freiburg
Emmanuel Gnandt: Albert-Ludwigs-Universität Freiburg
Sascha Jurkovic: Albert-Ludwigs-Universität Freiburg
Sabrina Burschel: Albert-Ludwigs-Universität Freiburg
Ramona Labatzke: Albert-Ludwigs-Universität Freiburg
Karoline Aierstock: Albert-Ludwigs-Universität Freiburg
Dennis Fiegen: Lead Identification and Optimization Sup
Daniel Wohlwend: Albert-Ludwigs-Universität Freiburg
Stefan Gerhardt: Albert-Ludwigs-Universität Freiburg
Oliver Einsle: Albert-Ludwigs-Universität Freiburg
Thorsten Friedrich: Albert-Ludwigs-Universität Freiburg

Nature Communications, 2019, vol. 10, issue 1, 1-9

Abstract: Abstract Respiratory complex I plays a central role in cellular energy metabolism coupling NADH oxidation to proton translocation. In humans its dysfunction is associated with degenerative diseases. Here we report the structure of the electron input part of Aquifex aeolicus complex I at up to 1.8 Å resolution with bound substrates in the reduced and oxidized states. The redox states differ by the flip of a peptide bond close to the NADH binding site. The orientation of this peptide bond is determined by the reduction state of the nearby [Fe-S] cluster N1a. Fixation of the peptide bond by site-directed mutagenesis led to an inactivation of electron transfer and a decreased reactive oxygen species (ROS) production. We suggest the redox-gated peptide flip to represent a previously unrecognized molecular switch synchronizing NADH oxidation in response to the redox state of the complex as part of an intramolecular feed-back mechanism to prevent ROS production.

Date: 2019
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Persistent link: https://EconPapers.repec.org/RePEc:nat:natcom:v:10:y:2019:i:1:d:10.1038_s41467-019-10429-0

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DOI: 10.1038/s41467-019-10429-0

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