2-Methylbutyryl CoA dehydrogenase from mitochondria of and its relationship to NADH-dependent 2-methylcrotonyl CoA reduction |
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Authors: | Richard Komuniecki Steven Fekete Julia Thissen |
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Institution: | Department of Biology, University of Toledo Toledo, Ohio, USA |
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Abstract: | Acyl CoA dehydrogenase and electron-transfer flavoprotein have been isolated and partially purified from mitochondria of the anaerobic nematode, . Dehydrogenase activity was greatest with 2-methylbutyryl CoA and the relative substrate specificities of the ascarid dehydrogenase(s) differ greatly from their mammalian counterparts. It appears that the ascarid dehydrogenase functions physiologically as a reductase, catalyzing the final step in the synthesis of branched-chain fatty acids. In fact, incubations of mitochondrial membranes with electron-transfer flavoprotein, 2-methylbutyryl CoA dehydrogenase, 2-methylcrotonyl CoA and NADH resulted in a substantial, rotenone-sensitive, 2-methylbutyrate synthesis. These results suggest that the ascarid electron-transport chain and at least two soluble mitochondrial proteins are involved in the NADH-dependent reduction of 2-methylcrotonyl CoA. |
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Keywords: | ETF electron transfer flavoprotein 2-MB 2-methylbutyrate 2-MV 2-methylvalerate |
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