Question: The amino acid cysteine has the structure shown: (a) A second sulfur-containing amino acid called cystine (C6H12N2O4S2) is formed when cysteine undergoes biological oxidation. Suggest

The amino acid cysteine has the structure shown:

(a) A second sulfur-containing amino acid called cystine (C6H12N2O4S2) is formed when cysteine undergoes biological oxidation. Suggest a reasonable structure for cystine.
(b) Another metabolic pathway converts cysteine to cysteine sulfinic acid (C3H7NO4S), then to cysteic acid (C3H7NO5S). What are the structures of these two compounds?

HSCH CHCO NH3 Cysteine

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