期刊
JOURNAL OF BACTERIOLOGY
卷 192, 期 19, 页码 5115-5123出版社
AMER SOC MICROBIOLOGY
DOI: 10.1128/JB.00612-10
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资金
- Max Planck Society
- Fonds der Chemischen Industrie
It was recently found that the cytoplasmic butyryl-coenzyme A (butyryl-CoA) dehydrogenase-EtfAB complex from Clostridium kluyveri couples the exergonic reduction of crotonyl-CoA to butyryl-CoA with NADH and the endergonic reduction of ferredoxin with NADH via flavin-based electron bifurcation. We report here on a second cytoplasmic enzyme complex in C. kluyveri capable of energetic coupling via this novel mechanism. It was found that the purified iron-sulfur flavoprotein complex NfnAB couples the exergonic reduction of NADP(+) with reduced ferredoxin (Fd(red)) and the endergonic reduction of NADP(+) with NADH in a reversible reaction: Fd(red)(2-) + NADH + 2 NADP(+) + H+ = Fd(ox) + NAD(+) + 2 NADPH. The role of this energy-converting enzyme complex in the ethanol-acetate fermentation of C. kluyveri is discussed.
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