Abstract

AbstractT4 RNA ligase, the product of the phage gene 63, is purified from phage‐infected cells. It catalyzes the ATP‐dependent covalent joining of single‐stranded 5'‐phosphoryl termini of DNA or RNA to single‐stranded 3'‐hydroxyl termini of DNA or RNA. This unit describes specific reaction conditions as well as applications such as radioactive labeling of 3' termini of RNA, circularizing deoxy‐ and ribo‐oligonucleotides, ligating oligomers for oligonucleotide synthesis, and stimulating the blunt‐end ligation activity of T4 DNA ligase.

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