期刊
FEBS LETTERS
卷 583, 期 19, 页码 3275-3279出版社
WILEY
DOI: 10.1016/j.febslet.2009.09.022
关键词
Alternative complex III; Photosynthesis; Electron transfer; Auracyanin; Chloroflexus aurantiacus
资金
- NSF [MCB-0646621]
The surprising lack of the cytochrome bc(1) complex in the filamentous anoxygenic phototrophic bacterium Chloroflexus aurantiacus suggests that a functional replacement exists to link the cyclic electron transfer chain. Earlier work identified the alternative complex III (ACIII) as a substitute of cytochrome bc1 complex. Herein, the enzymatic activity of ACIII is studied. The results strongly support the view that the ACIII functions as menaquinol: auracyanin oxidoreductase in the C. aurantiacus electron transfer chain. Among all the substrates tested, auracyanin is the most efficient electron acceptor of ACIII, suggesting that ACIII directly transfers the electron to auracyanin instead of cytochrome c-554. The lack of sensitivity to common inhibitors of the cytochrome bc1 complex indicates a different catalytic mechanism for the ACIII complex. (C) 2009 Federation of European Biochemical Societies. Published by Elsevier B. V. All rights reserved.
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