ID   4.1.99.20
DE   3-amino-4-hydroxybenzoate synthase.
AN   3,4-AHBA synthase.
CA   2-amino-4,5-dihydroxy-6-oxo-7-(phosphooxy)heptanoate = 3-amino-4-
CA   hydroxybenzoate + H(+) + 2 H2O + phosphate.
CC   -!- The reaction is suggested to take place in several steps.
CC   -!- Schiff base formation, double bond migration and dephosphorylation
CC       followed by ring opening and closing to form a pyrrolidine ring,
CC       and finally dehydration to form the product 3-amino-4-
CC       hydroxybenzoate.
CC   -!- In the bacterium Streptomyces griseus the enzyme is involved in
CC       biosynthesis of grixazone, a yellow pigment that contains a
CC       phenoxazinone chromophore.
CC   -!- Formerly EC 4.3.3.n1.
DR   B1VTI7, GRIH_STRGG ;  A0JC76, GRIH_STRGR ;
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