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| RNA Ligase (ATP) Polyribonucleotide Synthetase | tRNA Ligase | Ligase, tRNA | Synthetase, Polyribonucleotide An enzyme that catalyzes the conversion of linear RNA to a circular form by the transfer of the 5'-phosphate to the 3'-hydroxyl terminus. It also catalyzes the covalent joining of two polyribonucleotides in phosphodiester linkage. EC 6.5.1.3. |