Identification of a DNA nonhomologous end-joining complex in bacteria.

Weller, Geoffery R, Kysela, Boris, Roy, Rajat, Tonkin, Louise M, Scanlan, Elizabeth, Della, Marina, Devine, Susanne Krogh, Day, Jonathan P, Wilkinson, Adam, d'Adda di Fagagna, Fabrizio, Devine, Kevin M, Bowater, Richard P, Jeggo, Penny A, Jackson, Stephen P and Doherty, Aidan J (2002) Identification of a DNA nonhomologous end-joining complex in bacteria. Science, 297. pp. 1686-1689. ISSN 0036-8075

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Abstract

In eukaryotic cells, double-strand breaks (DSBs) in DNA are generally repaired by the pathway of homologous recombination or by DNA nonhomologous end joining (NHEJ). Both pathways have been highly conserved throughout eukaryotic evolution, but no equivalent NHEJ system has been identified in prokaryotes. The NHEJ pathway requires a DNA end-binding component called Ku. We have identified bacterial Ku homologs and show that these proteins retain the biochemical characteristics of the eukaryotic Ku heterodimer. Furthermore, we show that bacterial Ku specifically recruits DNA ligase to DNA ends and stimulates DNA ligation. Loss of these proteins leads to hypersensitivity to ionizing radiation in Bacillus subtilis. These data provide evidence that many bacteria possess a DNA DSB repair apparatus that shares many features with the NHEJ system of eukarya and suggest that this DNA repair pathway arose before the prokaryotic and eukaryotic lineages diverged.

Item Type: Article
Additional Information: AD directed the research and was the corresponding author. This paper reports the discovery of a new repair pathway in bacteria that was assumed to be only present in the eukarya.
Schools and Departments: School of Life Sciences > Sussex Centre for Genome Damage and Stability
Depositing User: EPrints Services
Date Deposited: 06 Feb 2012 19:32
Last Modified: 30 Nov 2012 17:03
URI: http://sro.sussex.ac.uk/id/eprint/21156
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