RNA-guided DNA endonuclease TnpB

UniProtKB accession:  Q7DF80

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UniProtKB description:  An RNA-guided dsDNA endonuclease. When guided by an RNA derived from the right-end element of its insertion sequence element (IS), cleaves DNA downstream of the 5'-TTGAT-3' transposon-associated motif (TAM). Cleaves supercoiled and linear DNA in a staggered manner 15-21 bases from the TAM yielding 5'-overhangs. Binds reRNA, an approximately 150 nucleotide base sRNA derived from the 3' end of its own gene, the right end (RE) of the insertion sequence (IS) and sequence downstream of the IS (PubMed:34619744). May cleave at the donor joint (generated by ISDra2 excision mediated by TnpA) to trigger homology-directed repair and restore intact IS in its original position (Probable). Inhibits transposition activity of the IS200 element; the possible zinc-binding motif of TnpB is required for this inhibition (PubMed:23461641). Part of IS element ISDra2, this protein is not required for transposition (PubMed:20090938). The IS element inserts 3' of the sequence 5'-TTGAT-3'; target duplication has not been observed (PubMed:14676423, PubMed:16359337).