title: Photooxidation of NADH by 2,3-butanedione: a potential source of error in studies on active site arginyl residues.
abstract: Incubation of NADH or NADPH with 2,3-butanedione in aqueous solution results in photooxidation of the reduced pyridine nucleotides under conditions of ordinary laboratory lighting. Maximum rates of photooxidation are obtained at pH 7 and with light at a wavelength of 410 nm. This reaction could lead to artifactual results in experiments on the role of arginyl groups in enzymes in which a reduced pyridine nucleotide is used to protect the active site residues from modification by 2,3-butanedione.
mesh_terms: D001120:Arginine / Q000032:analysis*; D002074:Butanones / Q000494:pharmacology*; D003931:Diacetyl / Q000494:pharmacology*; D008027:Light; D009243:NAD / Q000528:radiation effects*; D010084:Oxidation-Reduction
chemical_list: D002074:Butanones; D009243:NAD; D001120:Arginine; D003931:Diacetyl