. "\"Catalysis of the reaction: ATP + ribonucleotide(n) + ribonucleotide(m) = AMP + diphosphate + ribonucleotide(n+m).\" [EC:6.5.1.3]" . . "RNA ligase (ATP) activity" . "poly(ribonucleotide):poly(ribonucleotide) ligase (AMP-forming)" . "polyribonucleotide ligase activity" . "polyribonucleotide synthase (ATP) activity" . "EC:6.5.1.3" . "MetaCyc:RNA-LIGASE-ATP-RXN" . . "ribonucleic ligase activity" .