Oxidation of the thiol moiety of cysteine yields sulfinoalanine, which itself is processed to hypotaurine by an as of yet uncharacterized enzyme in humans . Whether further oxidation of hypotaurine to taurine needs an enzyme is unknown at present (Ye et al. 2007).
Wei, L, Bartlam, M, Tang, D, Ye, S, Rao, Z, Sun, P, Wu, X
cysteine dioxygenase activity of CDO1:Fe2+ [cytosol]
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