TTHA1444 ImGP synthase subunit HisF IGP synthase subunit HisF MSLAKRIVPCLDVHAGRVVKGVNFVNLRDAGDPVEAARAYDEAGADELVFLDISATHEERAILLDVVARVAERVFIPLTVGGGVRSLEDARKLLLSGADKVSVNSAAVRRPELIRELADHFGAQAVVLAIDARWRGDFPEVHVAGGRVPTGLHAVEWAVKGVELGAGEILLTSMDRDGTKEGYDLRLTRMVAEAVGVPVIASGGAGRMEHFLEAFQAGAEAALAASVFHFGEIPIPKLKRYLAEKGVHVRLD HIS6_THET8 IGP synthase cyclase subunit Imidazole glycerol phosphate synthase subunit HisF 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). hisF 252