BLD_0411 IGPS catalyzes the conversion of PRFAR and glutamine to IGP, AICAR and glutamate. The HisF subunit catalyzes the cyclization activity that produces IGP and AICAR from PRFAR using the ammonia provided by the HisH subunit (By similarity). 256 IGP synthase subunit HisF MSLAVRVIPCLDVDAGRVVKGVHFENLKDAGDPVELAAEYYRQGADEITFLDVTASSSHRNTMIDVVSCTAEQVFIPMTVGGGVRTPEDVDSLLRCGADKVGVNTAAINDPSLISRVADRFGNQVLVLSVDARREKGEQHTQSGFEVTTMGGRKSTGIDAIWWVKRAEQLGAGEILLNSMDADGTKEGFDLEMIRAVRKEVKIPIIASGGAGKVEDFPPAIEAGADAVLAASVFHYGILTIADVKAELKKHGYTVR IGP synthase cyclase subunit hisF HIS6_BIFLD ImGP synthase subunit HisF Imidazole glycerol phosphate synthase subunit HisF