Involved in the biosynthesis of the antibiotic, phenazine, a nitrogen-containing heterocyclic molecule having important roles in virulence, competition and biological control. chorismate + L-glutamine = anthranilate + H(+) + L-glutamate + pyruvate Antibiotic biosynthesis; phenazine biosynthesis. Component I catalyzes the formation of anthranilate using ammonia rather than glutamine, whereas component II provides glutamine amidotransferase activity.