IUBMB Enzyme Nomenclature


Accepted name: anthranilate synthase

Reaction: chorismate + L-glutamine = anthranilate + pyruvate + L-glutamate

For diagram of reaction click here.

Other name(s): anthranilate synthetase; chorismate lyase; chorismate pyruvate-lyase (amino-accepting); TrpE

Systematic name: chorismate pyruvate-lyase (amino-accepting; anthranilate-forming)

Comments: In some organisms, this enzyme is part of a multifunctional protein, together with one or more other components of the system for the biosynthesis of tryptophan [EC (anthranilate phosphoribosyltransferase ), EC (indole-3-glycerol-phosphate synthase), EC (tryptophan synthase) and EC (phosphoribosylanthranilate isomerase)]. The native enzyme in the complex uses either glutamine or, less efficiently, NH3. The enzyme separated from the complex uses NH3 only.

Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, PDB, CAS registry number: 9031-59-8


1. Baker, T. and Crawford, I.P. Anthranilate synthetase. Partial purification and some kinetic studies on the enzyme from Escherichia coli. J. Biol. Chem. 241 (1966) 5577-5584. [PMID: 5333199]

2. Creighton, T.E. and Yanofsky, C. Chorismate to tryptophan (Escherichia coli) - anthranilate synthetase, PR transferase, PRA isomerase, InGP synthetase, tryptophan synthetase. Methods Enzymol. 17A (1970) 365-380.

3. Hütter, R., Niederberger, P. and DeMoss, J.A. Tryptophan biosynthetic genes in eukaryotic microorganisms. Annu. Rev. Microbiol. 40 (1986) 55-77. [PMID: 16526091]

4. Ito, J. and Yanofsky, C. Anthranilate synthetase, an enzyme specified by the tryptophan operon of Escherichia coli: Comparative studies on the complex and the subunits. J. Bacteriol. 97 (1969) 734-742. [PMID: 4886290]

5. Zalkin, H. and Kling, D. Anthranilate synthetase. Purification and properties of component I from Salmonella typhimurium. Biochemistry 7 (1968) 3566-3573. [PMID: 4878701]

[EC created 1972]

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