UBA-like domain found in Caenorhabditis elegans tyrosyl-DNA phosphodiesterase 2 (TDP2) and similar proteins
The family includes C. elegans TDP2 and its homologs found in bilateria. TDP2 (also known as TTRAP or EAPII) belongs to the Mg(2+)/Mn(2+)-dependent family of phosphodiesterases which contains an N-terminal ubiquitin-associated (UBA)-like domain and a C-terminal phosphodiesterase domain. It required for the efficient repair of topoisomerase II-induced DNA double strand breaks. The topoisomerase is covalently linked by a phosphotyrosyl bond to the 5'-terminus of the break. TDP2 cleaves the DNA 5'-phosphodiester bond and restores 5'-phosphate termini needed for subsequent DNA ligation and hence repair of the break. Tyrosyl-DNA phosphodiesterase 1 (TDP1), an enzyme that cleaves 3'-phosphotyrosyl bonds, and TDP2 are complementary activities; together, they allow cells to remove trapped topoisomerase from both 3'- and 5'-DNA termini. TDP2 has been reported as being involved in apoptosis, embryonic development, and transcriptional regulation.
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