NADP + Reduction with Reduced Ferredoxin and NADP + Reduction with NADH Are Coupled via an Electron-Bifurcating Enzyme Complex in Clostridium kluyveri
Year: 2010
Type: article
Abstract: 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 (Fdred) and the endergonic reduction of NADP+ with NADH in a reversible reaction: Fdred2-+NADH+2 NADP++H+=Fdox+NAD++2 NADPH. The role of this energy-converting enzyme complex in the ethanol-acetate fermentation of C. kluyveri is discussed.
Source: Journal of Bacteriology
DOI: 10.1128/jb.00612-10
Institution: Max Planck Institute for Terrestrial Microbiology
Language: English
Subfield: Biochemistry
Domain: Life Sciences
Open Access status: green
Funder: Max-Planck-Gesellschaft
OpenAlex ID: W1970604668