Catalyzes the ATP-dependent amination of UTP to CTP with either L-glutamine or ammonia as the source of nitrogen (By similarity). CTP synthase MTRYIFVTGGVVSSLGKGIASASLAAILEARGLKITMLKLDPYINVDPGTMSPFQHGEVFVTQDGAETDLDLGHYERFVRTTMTQNNNFTTGRVYMDVLRKERRGDYLGATVQVIPHITDEIKRRIIKGAGDADVALVEIGGTVGDIESQPFLEAIRQLRVEIGAKRAMLMHLTLVPYIATAGETKTKPTQHSVKELRSIGLQPDVLVCRSDHPIDVSSRRKIALFTNVEERAVIALEDVDTIYRIPSVLHAQGLDDIVVERFGLECGQADLSEWDRVVDAKLNPEREVTIAMVGKYMELLDAYKSLIEAMTHAGIQSRTKVNLRYIDSEDIEQQGTSLLEGVDAILVPGGFGLRGVEGKISTVQYARENKIPYLGICLGMQVAVIEYARNVLGWSDANSTEFDKSSGHPVVGLITEWQDATGATEIRTEASDLGGTMRLGAQECQLQTGTLVHDCYAKDVIVERHRHRYEVNNNLLPQLEQAGLKISGRSGDGALVEVVEAPEHPWFVACQFHPEFTSTPRDGHPLFSGFVNAALKYSGKA PA14_17290 UTP--ammonia ligase pyrG 542 PYRG_PSEAB CTP synthetase