Absolute Stereochemistry of Flavins in Enzyme-Catalyzed Reactions

Dietmar J. Manstein, Emil F. Pai, Lawrence M. Schopfer, Vincent Massey

Research output: Contribution to journalArticlepeer-review

76 Scopus citations

Abstract

The 8-demethyl-8-hydroxy-5-deaza-5-carba analogues of FMN and FAD have been synthesized. Several apoproteins of flavoenzymes were successfully reconstituted with these analogues. This and further tests established that these analogues could serve as general probes for flavin stereospecificity in enzyme-catalyzed reactions. The method used by us involved stereoselective introduction of label on one enzyme combined with transfer to and analysis on a second enzyme. Using as a reference glutathione reductase from human erythrocytes for which the absolute stereochemistry of catalysis is known from X-ray studies [Pai, E. F., & Schulz, G. E. (1983) J. Biol. Chem. 258, 1752–1758], we were able to determine the absolute stereospecificities of other flavoenzymes. We found that glutathione reductase (NADPH), general acyl-CoA dehydrogenase (acyl-CoA), mercuric reductase (NADPH), thioredoxin reductase (NADPH), p-hydroxybenzoate hydroxylase (NADPH), melilotate hydroxylase (NADH), anthranilate hydroxylase (NADPH), and glucose oxidase (glucose) all use the re face of the flavin ring when interacting with the substrates given in parentheses.

Original languageEnglish (US)
Pages (from-to)6807-6816
Number of pages10
JournalBiochemistry
Volume25
Issue number22
DOIs
StatePublished - Nov 1986
Externally publishedYes

ASJC Scopus subject areas

  • Biochemistry

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