<p>In <taxon tax_id="5141">Neurospora crassa</taxon>, component I (the trp-2 gene product) of this enzyme catalyses the formation of anthranilate using ammonia rather than glutamine, whereas component II (the trp-1 gene product) is a trifunctional polypeptide bearing the glutamine amidotransferase (TrpG), indole-3-glycerol-phosphate synthase (TrpC), and phosphoribosylanthranilate isomerase (TrpF) activities [<cite idref="PUB00027742"/>].</p> <p>The active enzyme is a tetramer containing two chains each of components I and II.</p> Anthranilate synthase, component II, fungi