Catalyzes the ATP-dependent amination of UTP to CTP with either L-glutamine or ammonia as the source of nitrogen (By similarity). UTP--ammonia ligase pyrG CTP synthetase CTP synthase SaurJH9_2163 MTKFIFVTGGVVSSLGKGITASSLGRLLKDRGLNVTIQKFDPYLNVDPGTMSPYQHGEVFVTDDGAETDLDLGHYERFIDINLNKFSNVTAGKVYSHVLKKERRGDYLGGTVQVIPHITNEIKERLLLAGESTNADVVITEIGGTTGDIESLPFIEAIRQIRSDLGRENVMYVHCTLLPYIKAAGEMKTKPTQHSVKELRGLGIQPDLIVVRTEYEMTQDLKDKIALFCDINKESVIECRDADSLYEIPLQLSQQNMDDIVIKRLQLNAKYETQLDEWKQLLDIVNNLDGKITIGLVGKYVSLQDAYLSVVESLKHAGYPFAKDIDIRWIDSSEVTDENAAEYLADVDGILVPGGFGFRASEGKISAIKYARENNVPFFGICLGMQLATVEFSRNVLGLEGAHSAELDPATPYPIIDLLPEQKDIEDLGGTLRLGLYPCSIKEGTLAQDVYGKAEIEERHRHRYEFNNDYREQLEANGMVISGTSPDGRLVEMVEIPTNDFFIACQFHPEFLSRPNRPHPIFKSFIEASLKYQQNK 536 PYRG_STAA9