Concerning 1e- transfer in reduction by dihydronicotinamide: reaction of oxidized flavin and flavin radical with N-benzyl-1,5-dihydronicotinamide.
- 1 August 1982
- journal article
- research article
- Published by Proceedings of the National Academy of Sciences in Proceedings of the National Academy of Sciences
- Vol. 79 (15) , 4604-4608
- https://doi.org/10.1073/pnas.79.15.4604
Abstract
The rates of reaction of 5-ethyl-3-methyllumiflavinium perchlorate and 5-ethyl-3-methyllumiflavinyl radical with a NADH analog, N-benzyl-1,4-dihydronicotinamide [BNAH], were measured anaerobically in tert-butanol and 5% acetonitrile/95% tert-butanol solutions at 30.degree. C. The biphasic kinetics observed for the reaction of flavin radical with dihydronicotinamide were interpreted in terms of both a 1e- and a 2e- mechanism; the former was found to be inadequate based on experimental requirements of the mechanism. The dihydronicotinamide reacts preferentially with oxidized flavin rather than flavin radical, even when the concentration of oxidized flavin is at a concentration 5 orders of magnitude less than that of radical. The hydride reduction of oxidized flavin by BNAH is more facile than is the 1e- reduction of flavin radical by BNAH.This publication has 17 references indexed in Scilit:
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