Add time:08/27/2019         Source:sciencedirect.com

SummaryOxidative deamination of L-cystine by snake venom L-amino acid oxidase from Crotalus terrificus terrificus was studied. Formation of S-(2-oxo-2-carboxyethylthio)cysteine (OCETC) was shown by ion-exchange chromatography and by its reduction to S-(2-hydroxy-2-carboxyethylthio)cysteine by sodium borohydride at pH 3. In the absence of catalase in the reaction mixture, S-(carboxymethylthio)cysteine was formed through decarboxylation of OCETC. OCETC was shown to be further deaminated to give a ninhydrin-negative disulfide.

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