Chorismate binding, C-terminal This entry represents the catalytic regions of the chorismate binding enzymes anthranilate synthase, isochorismate synthase, aminodeoxychorismate synthase and para-aminobenzoate synthase.Anthranilate synthase catalyses the reaction:<reaction>chorismate + l-glutamine = anthranilate + pyruvate + l-glutamate.</reaction>The enzyme is a tetramer comprising 2 I and 2 II components: this entry is restricted to component I that catalyses the formation of anthranilate using ammonia rather than glutamine, while component IIprovides glutamine amidotransferase activity <db_xref db="INTERPRO" dbkey="IPR006220"/>.