Abstract
The facultatively methylotrophic bacterium Pseudomonas sp. 101, grown on methanol in presence of molybdate, contains a new formate dehydrogenase (N-FDH) catalyzing NAD+-dependent oxidation of formate. The activity of this N-FDH could also be measured in presence of artificial electron acceptors, ferricyanide and 2,6-dichlorophenol indophenol. This new enzyme is absent in cells grown on a methanol-containing medium with tungstate, where only another two, previously described formate dehydrogenases, which are active only with NAD+ or only with artificial acceptors, respectively, were determined. The N-FDH was partially purified by a combination of ion-exchange and gel-filtration chromatography, and was shown to differ in its properties from the known NAD+-dependent counterpart.
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