RNA ligase 1

UniProtKB accession:  P00971

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UniProtKB description:  Involved in countering a host defense mechanism which, following viral infection, activates the host anticodon nuclease and shuts off viral translation. Repairs 5'-PO4 and 3'-OH groups in the cleaved host tRNA (PubMed:16671895, PubMed:17068206, PubMed:2444436). The nick ligation reaction entails three nucleotidyl transfer steps (PubMed:12766156). In the first step, the RNA ligase reacts with ATP in the absence of nucleic acid to form a covalent ligase-AMP intermediate and release pyrophosphate (PubMed:12766156). In step 2, the ligase-AMP binds to the nicked duplex nucleic acid and transfers the adenylate to the 5'-PO4 terminus to form an adenylylated nicked intermediate (PubMed:12766156). In step 3, the RNA ligase directs the attack of the nick 3'-OH on the 5'-phosphoanhydride linkage, resulting in a repaired 3'-5' phosphodiester and release of AMP (By similarity) (PubMed:12766156).