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Cysteic acid also known as 3-sulfo-l-alanine is the organic compound with the formula HO3SCH2CHCO2H. It is often referred to as cysteate, which near neutral pH takes the form O3SCH2CHCO2.
It is an amino acid generated by oxidation of cysteine, whereby a thiol group is fully oxidized to a sulfonic acid/sulfonate group. It is further metabolized via 3-sulfolactate, which converts to pyruvate and sulfite/bisulfite. The enzyme L-cysteate sulfo-lyase catalyzes this conversion. Cysteate is not a biosynthetic precursor to taurine, which is derived from cysteine sulfinate.
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