title: A novel diazonium-sulfhydryl reaction in the inactivation of yeast alcohol dehydrogenase by diazotized 3-aminopyridine adenine dinucleotide.
abstract: Diazotized 3-aminopyridine adenine dinucleotide has been found to modify four sulfhydryl groups per molecule of enzyme during the complete inactivation of yeast alcohol dehydrogenase. The reaction of sulfhydryl groups was indicated by titration studies with 5,5-dithiobis(2-nitrobenzoic acid) as well as isolation and quantitation of the cysteinyl derivative released by acid hydrolysis of the modified enzyme. The cysteinyl derivative was identified as S-(3-pyridyl)cysteine. Authentic S-(3-pyridyl)cystein was synthesized and structurally characterized for these studies. Diazonium-sulfhydryl reactions were demonstrated for a number of diazonium derivatives with cysteine, homocysteine, glutathione, and mercaptoethanol at 0-4 degrees and neutral pH. Second order rate constants were determined in reactions of these sulfhydryl compounds with diazotized 1-methyl-3-aminopyridinium chloride, diazotized 3-aminopyridine adenine dinucleotide, and diazotized 3-aminopyridine adenine dinucleotide phosphate.
mesh_terms: D000429:Alcohol Oxidoreductases / Q000037:antagonists & inhibitors*; D000596:Amino Acids / Q000032:analysis; D001391:Azo Compounds / Q000494:pharmacology*; D001565:Benzoates; D001665:Binding Sites; D002850:Chromatography, Gel; D002855:Chromatography, Thin Layer; D003545:Cysteine; D003903:Deuterium; D004220:Disulfides; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D009682:Magnetic Resonance Spectroscopy; D009243:NAD / Q000031:analogs & derivatives* / Q000494:pharmacology; D009574:Nitro Compounds; D011485:Protein Binding; D012441:Saccharomyces cerevisiae / Q000201:enzymology*; D013053:Spectrophotometry; D013055:Spectrophotometry, Infrared; D013056:Spectrophotometry, Ultraviolet; D013438:Sulfhydryl Compounds; D013997:Time Factors
chemical_list: D000596:Amino Acids; D001391:Azo Compounds; D001565:Benzoates; D004220:Disulfides; D009574:Nitro Compounds; D013438:Sulfhydryl Compounds; D009243:NAD; D003903:Deuterium; D000429:Alcohol Oxidoreductases; D003545:Cysteine