The sulfur-containing amino acid cysteine is oxidized to

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Cysteine is commonly oxidized to cysteic acid through the addition of two oxygen molecules, forming a sulfate group (-SO3H) on the cysteine molecule. This oxidation makes cysteine more polar and less hydrophobic, which can affect its function in proteins. Cysteic sulfoxide and sulfoxide-carboxylic acid are not known oxidation products of cysteine, and an amide would require the loss of the sulfur atom in cysteine, making it a different molecule entirely.

The Sulfur-Containing Amino Acid Cysteine Is Oxidized to