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. 1993 Aug;175(15):4719–4728. doi: 10.1128/jb.175.15.4719-4728.1993

Physiological and biochemical characterization of the soluble formate dehydrogenase, a molybdoenzyme from Alcaligenes eutrophus.

J Friedebold 1, B Bowien 1
PMCID: PMC204923  PMID: 8335630

Abstract

Organoautotrophic growth of Alcaligenes eutrophus on formate was dependent on the presence of molybdate in the medium. Supplementation of the medium with tungstate lead to growth cessation. Corresponding effects of these anions were observed for the activity of the soluble, NAD(+)-linked formate dehydrogenase (S-FDH; EC 1.2.1.2) of the organism. Lack of molybdate or presence of tungstate resulted in an almost complete loss of S-FDH activity. S-FDH was purified to near homogeneity in the presence of nitrate as a stabilizing agent. The native enzyme exhibited an M(r) of 197,000 and a heterotetrameric quaternary structure with nonidentical subunits of M(r) 110,000 (alpha), 57,000 (beta), 19,400 (gamma), and 11,600 (delta). It contained 0.64 g-atom of molybdenum, 25 g-atom of nonheme iron, 20 g-atom of acid-labile sulfur, and 0.9 mol of flavin mononucleotide per mol. The fluorescence spectrum of iodine-oxidized S-FDH was nearly identical to the form A spectrum of milk xanthine oxidase, proving the presence of a pterin cofactor. The molybdenum-complexing cofactor was identified as molybdopterin guanine dinucleotide in an amount of 0.71 mol/mol of S-FDH. Apparent Km values of 3.3 mM for formate and 0.09 mM for NAD+ were determined. The enzyme coupled the oxidation of formate to a number of artificial electron acceptors and was strongly inactivated by formate in the absence of NAD+. It was inhibited by cyanide, azide, nitrate, and Hg2+ ions. Thus, the enzyme belongs to a new group of complex molybdo-flavo Fe-S FDH that so far has been detected in only one other aerobic bacterium.

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Selected References

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