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T4 polynucleotide ligase efficiently catalyzes the head-to-tail joining of the ribo-oligoadenylates, r-(pA)(8) and r-(pA)(10), in the presence of high molecular weight deoxypolythymidylate. The enzyme also catalyzes the joining of deoxy-oligothymidylates, e.g., d-(pT)(10), in the presence of ribopolyadenylate. The enzyme failed to bring about the joining of r-(pA)(10) when poly r-U was used as the template, although a slow formation of the expected activated intermediate from r-(pA)(10) was detected.

proceedings of the national academy of sciences of the united states of america

Polynucleotide Ligase-Catalyzed Joining of Deoxyribo-oligonucleotides on Ribopolynucleotide Templates and of Ribo-oligonucleotides on Deoxyribopolynucleotide Templates