Zeng, Zhihong, Cortés-Ledesma, Felipe, El-Khamisy, Sherif F and Caldecott, Keith W (2010) TDP2/TTRAP is the major 5'-tyrosyl DNA phosphodiesterase activity in vertebrate cells and is critical for cellular resistance to topoisomerase II-induced DNA damage. Journal of Biological Chemistry, 286 (1). pp. 403-409. ISSN 0021-9258

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Abstract

Topoisomerase II (Top2) activity involves an intermediate in which the topoisomerase is covalently bound to a DNA double-strand break via a 5′-phosphotyrosyl bond. Although these intermediates are normally transient, they can be stabilized by antitumor agents that act as Top2 “poisons,” resulting in the induction of cytotoxic double-strand breaks, and they are implicated in the formation of site-specific translocations that are commonly associated with cancer. Recently, we revealed that TRAF and TNF receptor-associated protein (TTRAP) is a 5′-tyrosyl DNA phosphodiesterase (5′-TDP) that can cleave 5′-phosphotyrosyl bonds, and we denoted this protein tyrosyl DNA phosphodiesterase-2 (TDP2). Here, we have generated TDP2-deleted DT40 cells, and we show that TDP2 is the major if not the only 5′-TDP activity present in vertebrate cells. We also show that TDP2-deleted DT40 cells are highly sensitive to the anticancer Top2 poison, etoposide, but are not hypersensitive to the Top1 poison camptothecin or the DNA-alkyating agent methyl methanesulfonate. These data identify an important mechanism for resistance to Top2-induced chromosome breakage and raise the possibility that TDP2 is a significant factor in cancer development and treatment.

Item Type:	Article
Additional Information:	GDSC338
Keywords:	Cancer Therapy, DNA Damage, DNA Repair, DNA Topoisomerase Phosphodiesterases
Schools and Departments:	School of Life Sciences > Sussex Centre for Genome Damage and Stability
Subjects:	R Medicine > R Medicine (General) R Medicine > RC Internal medicine > RC0254 Neoplasms. Tumors. Oncology Including cancer and carcinogens
Depositing User:	Gee Wheatley
Date Deposited:	26 Nov 2010
Last Modified:	29 Nov 2017 17:14
URI:	http://srodev.sussex.ac.uk/id/eprint/2554
Google Scholar:	10 Citations

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