MLAKRIIPCLDVADGRVKKGVNFVNLTDVGDPVAIAAAYQQQGADELVFLDIAATNEHRETMAAMVEQVSAQVFMPLTIGGGITSVADMQRILRAGADKTAINSAAVANPELIRAGAEKFGNQCIVVAIDAAWDAAAGQYRVYTHGGQQATDLDAVAWAKQAVALGAGELLVTSMDRDGTKAGFDTKLYQALGATVNVPIIASGGAGNLQDFVDVFSTTPVDGALAASVFHFGELTIADVKATLRKQGVVVR ImGP synthase subunit HisF lp_2554 HIS6_LACPL hisF IGP 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). 252 Imidazole glycerol phosphate synthase subunit HisF IGP synthase cyclase subunit