S-Carboxymethyl-L-Cysteine CAS NO.: 638-23-3

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S-Carboxymethyl-L-Cysteine CAS NO.: 638-23-3
Posting date : Aug 15, 2008
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The identity of the enzyme(s) responsible for the S-oxidation of the mucoactive drug S-carboxymethyl-L-cysteine (SCMC) is unknown but the protein(s) are a susceptibility factor for a number of chronic degenerative diseases. The structural similarities between the amino acid L-cysteine and SCMC have raised the possibility that cysteine dioxygenase (CDO) may be responsible for this biotransformation reaction. Both CDO and SCMC S-oxygenase were found to require Fe2+ for enzymatic activity, and both enzyme activities were inhibited by Fe2+ and Fe3+ chelators. However, sulphydryl group modification of the enzymes resulted in the activation of the S-oxidation of SCMC but inhibition of the S-oxidation of L-cysteine. When the two enzyme activities were quantified in 20 female hepatic cytosolic fractions no linear correlation in the production of their respective metabolites was seen.

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