ID 1.14.99.50 DE gamma-glutamyl hercynylcysteine S-oxide synthase. CA gamma-L-glutamyl-L-cysteine + hercynine + O2 = gamma-L-glutamyl- CA hercynylcysteine S-oxide + H2O. CC -!- The enzyme, found in bacteria, is specific for both hercynine and CC gamma-L-glutamyl-L-cysteine. CC -!- It is part of the biosynthesis pathway of ergothioneine. DR A0R5N0, EGTB_MYCS2 ; G7CFI3, EGTB_MYCT3 ; Q7D513, EGTB_MYCTO ; DR O69671, EGTB_MYCTU ; //