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J. Biol. Chem., Vol. 255, Issue 24, 11802-11806, 12, 1980

Identification of deoxy-alpha-tocopherolquinol as another endogenous electron donor for biohydrogenation

PE Hughes and SB Tove

Solvent extracts of Butyrivibrio fibrisolvens contain 2-[3, 7, 11, 15- tetramethylhexadecyl]-3, 5, 6-trimethyl-benzoquinol (deoxy-alpha- tocopherolquinol) that can serve as an alternate electron donor for alpha-tocopherolquinol for the biohydrogenation of cis-9, trans-11- octadecadienoate. In addition, the cell extracts contain deoxy-alpha- tocopherolquinone. This compound arises metabolically from alpha- tocopherolquinone via dehydration to trimethylphytylbenzoquinone followed by hydrogenation to deoxy-alpha-tocopherolquinone. Although the hydrogenation of the isoprene double bond and the conjugated fatty acid both use NADH as the primary reductant, the two reactions appear to be catalyzed by different enzymes.
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