tRNA nucleotidyltransferase Catalyzes the addition and repair of the essential 3'- terminal CCA sequence in tRNAs without using a nucleic acid template. Adds these three nucleotides in the order of C, C, and A to the tRNA nucleotide-73, using CTP and ATP as substrates and producing inorganic pyrophosphate. 412 CCA-adding enzyme tRNA CCA-pyrophosphorylase cca MIEEEVLKIIKPTEEDKKGIEKVLEIIRERLNKLDFEVEGSFRKGTWLRQDTDVDVFVFYPKDVGKEYLERNALNDIINRIKDLDYTLAYAEHPYVIVNINNVEVDIVPALRVESGDRAITAVDRTPFHTKYVTSHLDERGKDEVRLLKRFMKGIGVYGAELKVQGFSGYATELLVIYYGSFRKVLEAASKWKHPIKIELTKPMRAFSEPLIIPDPVDPRRNVTAAVSLKNIATFSVAAKYYLKNPSMEFFFPSKKVEEKIKGDVLILRLNLDEKSSEDIIWGQIKRSVNKIERALKQSGFRVIDIQAWGDTSNIVIAVQLESKNIGQYYLNIGPQYYSETIDDFIQKNDNIWVGEDGRLYSIKERKEYNAEAIAKKNIVLKVKYNIESYWLQNTEDQQIMKFLRKTPTWLK tRNA-NT tRNA adenylyl-/cytidylyl- transferase CCA_SULSH CCA tRNA nucleotidyltransferase