Evidence for a tungsten-stimulated aldehyde dehydrogenase activity of Desulfovibrio simplex that oxidizes aliphatic and aromatic aldehydes with flavins as coenzymes |
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Authors: | G Zellner Anke Jargon |
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Institution: | Institut für Mikrobiologie, Universit?t Hannover, Schneiderberg 50, D-30167 Hannover, Germany, DE
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Abstract: | The aldehyde dehydrogenase activity of the sulfate-reducing bacterium Desulfovibrio simplex strain DSM 4141 was characterized in cell-free extracts. Oxygen-sensitive, constitutive aldehyde dehydrogenase activity was
found in cells grown on l(+)-lactate, hydrogen, or vanillin with sulfate as the electron acceptor. A 1.83- to 2.6-fold higher specific activity was
obtained in cells grown in media supplemented with 1 μM WO4
2–. The aldehyde dehydrogenase in cell-free extracts catalyzed the oxidation of aliphatic (K
m < 20 μM) and aromatic aldehydes (K
m < 0.32 mM) using methyl viologen as the electron acceptor. Flavins (FMN and FAD) were also active and are proposed to be
the natural cofactors, while no activity was obtained with NAD+ or NADP+. 185WO4
2– was incorporated in vivo into D. simplex; it was found exclusively in the soluble fraction (≥ 98%). Anionic-exchange chromatography demonstrated coelution of 185W with two distinct peaks, the first one containing hydrogenase and formate dehydrogenase activities, and the second one aldehyde
dehydrogenase activity.
Received: 7 February 1997 / Accepted: 6 June 1997 |
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Keywords: | Aldehyde Aldehyde dehydrogenase FMN FAD Tungstate Sulfate-reducing bacteria Desulfovibrio |
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