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- W763926401 abstract "A segment of the photosynthetic electron transfer complex in chromatophores from RhodospiriHum rubrum has been studied by the dark anaerobic oxidation of reduced nicotinamide adenine dinucleotide (NADH) by fumarate» The reaction is stoichiometric and entirely chromatophoredependent. Maximal activity occurred at pH 7.2, and all activity was lost below pH 5.0, and above pH 8.0. ++ Malonate, rotenone, Hg , and £-hydroxymercuribenzoate, but not 2N-heptyl-4-hydroxyquinoline-N-oxide, inhibited the reaction; malonate inhibition was competitive with the : substrate.fumarate. Catalytic quantities of quinacrine, riboflavin, flavin mononucleotide, flavin adenine dinucleotide, and a flavoprotein from Azotobacter vinelandii each enhanced the rate of NADH oxidation. Using stoichiometric amounts of riboflavin the reaction was further studied: riboflavin was first reduced by NADH, and then re-oxidized by fumarate. Some reduction of riboflavin by NADH occurred in the absence of chromatophores, but addition of chromatophores increased the rate of this reduction seven-fold. Oxidation of the reduced riboflavin by fumarate did not proceed in the absence of chromato phores The dark enzymatic reduction and subsequent oxidation of riboflavin were similarly inhibited by" @default.
- W763926401 created "2016-06-24" @default.
- W763926401 creator A5000981521 @default.
- W763926401 date "1968-01-01" @default.
- W763926401 modified "2023-09-23" @default.
- W763926401 title "Dark anaerobic oxidation of NADH by fumarate with chromatophores from Rhodospirillum rubrum" @default.
- W763926401 cites W1903141645 @default.
- W763926401 hasPublicationYear "1968" @default.
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