ID   1.21.3.10
DE   hercynylcysteine S-oxide synthase.
CA   hercynine + L-cysteine + O2 = H2O + S-(hercyn-2-yl)-L-cysteine S-oxide.
CC   -!- Requires Fe(2+) for activity.
CC   -!- The enzyme, found in fungal species, is part of a fusion protein that
CC       also has the the activity of EC 2.1.1.44.
CC   -!- It is part of the biosynthesis pathway of ergothioneine.
CC   -!- The enzyme can also use L-selenocysteine to produce
CC       hercynylselenocysteine, which can be converted to selenoneine.
CC   -!- Formerly EC 1.14.99.51.
DR   Q7RX33, EGT1_NEUCR ;  O94632, EGT1_SCHPO ;
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