Learning from hydrogenases: Location of a proton pump and of a second FMN in bovine NADH-ubiquinone oxidoreductase (Complex I)

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Abstract

Hydrogenases have clear evolutionary links to the much more complex NADH-ubiquinone oxidoreductases (Complex I). Certain membrane-bound [NiFe]-hydrogenases presumably pump protons. From a detailed comparison of hydrogenases and Complex I, it is concluded here that the TYKY subunit in these enzymes is a special 2[4Fe-4S] ferredoxin, which functions as the electrical driving unit for a proton pump. The comparison further revealed that the flavodoxin fold from [NiFe]-hydrogenases is presumably conserved in the PSST subunit of Complex I. It is proposed that bovine Complex I and the soluble NAD+-reducing hydrogenase from Ralstonia eutropha each contain a second FMN group. (C) 2000 Federation of European Biochemical Societies.

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Albracht, S. P. J., & Hedderich, R. (2000). Learning from hydrogenases: Location of a proton pump and of a second FMN in bovine NADH-ubiquinone oxidoreductase (Complex I). FEBS Letters, 485(1), 1–6. https://doi.org/10.1016/S0014-5793(00)02172-4

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