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- W2471567169 abstract "Substrate specificity is studied of cysteine lyase, a phosphopyridoxal-dependent enzyme belonging to the subgroup of beta-replacing lyases. This enzyme has a narrow specificity for the amino substrate; its only primary substrate is L-cysteine. Cysteine lyase has a broad specificity for the cosubstrate (replacing agent), catalysing the synthesis of L-cysteic acid from L-cysteine and sulfite ion or cystein thioesters (in the presence of some thiols). Enzyme is incapable to use alpha-phenyl- and alpha-methylcysteine as substrates. It is found that enzyme catalyses the exchange of alpha-H atoms of the aminoacid substrate cysteine with 3H2O. It does not catalyse alpha-hydrogenexchange in close structural analogues of substrate: L-alanine, D-serine, treonine, allo-threonine and 3-phosphoserine. L-Serine inhibited the synthesis of S-hydroxyethylcystein from cysteine and beta-mercaptoethanol (Ki of L-serine is 0,8-10(-2) M), participating at the first stage of reaction: the formation of a pyridoxylidenic derivative, which does not undergo the further alpha,beta-elimination of beta-replacement reactions." @default.
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- W2471567169 date "1975-03-01" @default.
- W2471567169 modified "2023-09-23" @default.
- W2471567169 title "[Substrate specificity of cysteine lyase]." @default.
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