Anthranilate phosphoribosyltransferase EC 24218; Catalyzes the transfer of the phosphoribosyl group of 5- phosphorylribose-1-pyrophosphate (PRPP) to anthranilate to yield N-(5'- phosphoribosyl)-anthranilate (PRA).

Chorismate synthase EC 4235; Catalyzes the anti-1,4-elimination of the C-3 phosphate and the C-6 proR hydrogen from 5-enolpyruvylshikimate-3-phosphate (EPSP) to yield chorismate, which is the branch point compound that serves as the starting substrate for the three terminal pathways of aromatic amino acid biosynthesis. This reaction introduces a second double bond into the aromatic ring system.

Phosphoribosylanthranilate isomerase EC 53124; Belongs to the TrpF family.

Tryptophan synthase beta chain EC 42120; The beta subunit is responsible for the synthesis of L- tryptophan from indole and L-serine.

Tryptophan synthase alpha chain EC 42120; The alpha subunit is responsible for the aldol cleavage of indoleglycerol phosphate to indole and glyceraldehyde 3-phosphate. Belongs to the TrpA family.

Dihydropteroate synthase EC 25115; Catalyzes the condensation of para-aminobenzoate (pABA) with 6-hydroxymethyl-7,8-dihydropterin diphosphate (DHPt-PP) to form 7,8- dihydropteroate (H2Pte), the immediate precursor of folate derivatives.

Shikimate 5dehydrogenase I alpha EC 11125; Involved in the biosynthesis of the chorismate, which leads to the biosynthesis of aromatic amino acids. Catalyzes the reversible NADPH linked reduction of 3-dehydroshikimate (DHSA) to yield shikimate (SA).

Adenine phosphoribosyltransferase EC 2427; Catalyzes a salvage reaction resulting in the formation of AMP, that is energically less costly than de novo synthesis.