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Complex I (NADH:ubiquinone oxidoreductase) has a central function in oxidative phosphorylation and hence for efficient ATP production in most prokaryotic and eukaryotic cells. This huge membrane protein complex transfers electrons from NADH to ubiquinone and couples this exergonic redox reaction to endergonic proton pumping across bioenergetic membranes. Although quinone reduction seems to be critical...
Iron–sulfur cluster N2 of complex I (proton pumping NADH:quinone oxidoreductase) is the immediate electron donor to ubiquinone. At a distance of only ∼7Å in the 49-kDa subunit, a highly conserved tyrosine is found at the bottom of the previously characterized quinone binding pocket. To get insight into the function of this residue, we have exchanged it for six different amino acids in complex I from...
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