5-Histidylcysteine sulfoxide synthase is the initial enzyme in the ovothiol biosynthetic pathway.
It facilitates the oxidative addition of cysteine to histidine, resulting in the formation of 5-histidylcysteine sulfoxide.
[1] This enzyme is present in trypanosomes, where it also exhibits S-Adenosyl methionine (SAM)-dependent methyltransferase activity, catalyzing the methylation of the N1 position.
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