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- W2052418232 abstract "Peroxidase-catalyzed oxidation of 3-(3,4-dihydroxyphenyl)alanine (DOPA) and its S-cysteinyl derivatives(cysteinyldopas) in the presence of cysteine was studied by analyzing the products with chromatography on Dowex 50W. Products of the oxidation of DOPA were found to be 5-S- and 2-S-cysteinyldopa, 2,5-S,S-dicysteinyldopa, and three unknown compounds A1, B, and C. 5-S- and 2-S-cysteinyldopa were also oxidized as easily as DOPA to give 2,5-S,S-dicysteinyldopa and similar patterns of the unknown compounds. Further oxidation of 2,5-S,S-dicysteinyldopa in the presence of cysteine yielded compounds A1, B, and C, whereas in its absence compound B was not formed. From these results coupled with the spectral data, it is suggested that compounds A1 and C are the two isomeric dihydrobenzothiazine derivatives of 2,5-S,S-dicysteinyldopa, while compound B is 2,5,6-S,S-tricysteinyldopa. These date suggest a possibility that peroxidase may play some role in the formation of cysteinyldopa and related metabolites in vivo." @default.
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- W2052418232 date "1981-01-01" @default.
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- W2052418232 title "Formation of cysteine conjugates from dihydroxyphenylalanine and its S-cysteinyl derivatives by peroxidase-catalyzed oxidation" @default.
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- W2052418232 doi "https://doi.org/10.1016/0304-4165(81)90388-3" @default.
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