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Gamma-irradiated flavin adenine dinucleotide: a D-amino acid oxidase inhibitor.

Flavin adenine dinucleotide (FAD) was irradiated with60 Co radiation and the chemical and biological properties were determined. The spectra showed both shifts and decrease of the absorption maxima at 375 and 450 nm indicating destruction of the isoalloxazine moiety of the FAD. A decrease in absorption at 260 nm was attributed primarily to the destruction of the flavin mononucleotide (FMN) moiety rather than the AMP portion of FAD. Biological activity in the D-amino acid oxidase system was rapidly decreased by irradiation. FAD irradiated in vacuo exhibited less destruction, thus indicating the "oxygen-effect." The irradiated FAD was found to be a competitive inhibitor for the D-amino acid oxidase. Since FAD is a coenzyme for a number of enzymes, irradiated FAD is predicted to be an inhibitor to any enzyme in which the adenine or AMP moiety is involved in binding to the "active site."