| Literature DB >> 14730350 |
Manuel Diez1, Boris Zimmermann, Michael Börsch, Marcelle König, Enno Schweinberger, Stefan Steigmiller, Rolf Reuter, Suren Felekyan, Volodymyr Kudryavtsev, Claus A M Seidel, Peter Gräber.
Abstract
Synthesis of ATP from ADP and phosphate, catalyzed by F(0)F(1)-ATP synthases, is the most abundant physiological reaction in almost any cell. F(0)F(1)-ATP synthases are membrane-bound enzymes that use the energy derived from an electrochemical proton gradient for ATP formation. We incorporated double-labeled F(0)F(1)-ATP synthases from Escherichia coli into liposomes and measured single-molecule fluorescence resonance energy transfer (FRET) during ATP synthesis and hydrolysis. The gamma subunit rotates stepwise during proton transport-powered ATP synthesis, showing three distinct distances to the b subunits in repeating sequences. The average durations of these steps correspond to catalytic turnover times upon ATP synthesis as well as ATP hydrolysis. The direction of rotation during ATP synthesis is opposite to that of ATP hydrolysis.Entities:
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Year: 2004 PMID： 14730350 DOI： 10.1038/nsmb718
Source DB: PubMed Journal: Nat Struct Mol Biol ISSN： 1545-9985 Impact factor: 15.369