Anthranilate synthase component I, N terminal region
Anthranilate synthase (EC:18.104.22.168) catalyzes the first step in the biosynthesis of tryptophan. Component I catalyzes the formation of anthranilate using ammonia and chorismate. The catalytic site lies in the adjacent region, described in the chorismate binding enzyme family (pfam00425). This region is involved in feedback inhibition by tryptophan. This family also contains a region of Para-aminobenzoate synthase component I (EC 4.1.3.-).