Transposase that mediates sequence-specific genomic rearrangements (PubMed:26406119, PubMed:28504702). Can induce genomic rearrangements that inactivate the HPRT1 gene (PubMed:27491780). Induces site-specific DNA rearrangements, including intrachromosomal deletions, as well as inversions, duplications and translocations, in rhabdoid tumors that share developmental origin with cells that normally express PGBD5, even though these tumors may not exhibit apparent widespread genomic instability. This activity recurrently targets regulatory elements and tumor suppressor genes and promotes cell transformation. Has been domesticated very early in vertebrate evolution, approximately 500 million years ago, in the common ancestor of cephalochordates and vertebrates. Truncated N-terminus. Truncated N-terminus.