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S-Methylcysteine

Chemical compound From Wikipedia, the free encyclopedia

S-Methylcysteine
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S-Methylcysteine is the amino acid with the nominal formula CH3SCH2CH(NH2)CO2H. It is the S-methylated derivative of cysteine. This amino acid occurs widely in plants, including many edible vegetables.[1]

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Natural occurrence

S-Methylcysteine is not genetically coded, but it arises by post-translational methylation of cysteine. One pathway involves methyl transfer from alkylated DNA by zinc-cysteinate-containing repair enzymes such as methylated-DNA-protein-cysteine methyltransferase.[2][3]

S-Methylcysteine sulfoxide is an oxidized derivative of S-methylcysteine that is found in onions.[4]

MetaCyc contains a list of biochemical reactions producing and consuming this substance.[5]

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Other chemical properties

Beyond its biological context, S-methylcysteine has been examined as a chelating agent.[6]

References

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