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NADH-linked fumarate reductase and NADH dehydrogenase activities inFibrobacter succinogenes

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Abstract

Crude membrane preparation fromFibrobacter succinogenes S85 were investigated and found to contain NADH dehydrogenase (NADH:decylubiquinone oxidoreductase) and NADH-linked fumarate reductase activities. Under aerobic conditions the maximum NADH dehydrogenase activity (252 nmoles/min/mg protein) was ten times greater than that of NADH-fumarate reductase (23 nmoles/min/mg protein). NADH-fumarate reductase was strongly inhibited by 2-heptyl-4-hydroxyquinoline-N-oxide (HOQNO), rotenone, HgCl2, ando-phenanthroline. Inhibition of the NADH dehydrogenase by the first three compounds, particularly rotenone, accounted for most of the effects on NADH-fumarate reductase. The α-band of ab-type cytochrome was resolved into two cytochromes, a cytochromeb 560 (oxidized by addition of HOQNO) and a cytochromeb 563 (oxidized by subsequent addition of fumarate).

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Published with the approval of the Director of the Agricultural Experiment Station, North Dakota State University, as journal article no. 2137.

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Meinhardt, S.W., Glass, T.L. NADH-linked fumarate reductase and NADH dehydrogenase activities inFibrobacter succinogenes . Current Microbiology 28, 247–251 (1994). https://doi.org/10.1007/BF01575969

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