Abstract
In mammalian cells, repair of DNA double-strand breaks (DSBs) by nonhomologous end-joining (NHEJ) is critical for genome stability. Although the end-bridging and ligation steps of NHEJ have been reconstituted in vitro, little is known about the end-processing reactions that occur before ligation. Recently, functionally homologous end-bridging and ligation activities have been identified in prokarya. Consistent with its homology to polymerases and nucleases, we demonstrate that DNA ligase D from Mycobacterium tuberculosis (Mt-Lig) possesses a unique variety of nucleotidyl transferase activities, including gap-filling polymerase, terminal transferase, and primase, and is also a 3′ to 5′ exonuclease. These enzyme activities allow the Mt-Ku and Mt-Lig proteins to join incompatible DSB ends in vitro, as well as to reconstitute NHEJ in vivo in yeast. These results demonstrate that prokaryotic Ku and ligase form a bona fide NHEJ system that encodes all the recognition, processing, and ligation activities required for DSB repair.
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Dates
Type | When |
---|---|
Created | 20 years, 10 months ago (Oct. 21, 2004, 4:53 p.m.) |
Deposited | 1 year, 7 months ago (Jan. 9, 2024, 11:31 p.m.) |
Indexed | 2 months ago (June 25, 2025, 9:08 a.m.) |
Issued | 20 years, 10 months ago (Oct. 22, 2004) |
Published | 20 years, 10 months ago (Oct. 22, 2004) |
Published Print | 20 years, 10 months ago (Oct. 22, 2004) |
@article{Della_2004, title={Mycobacterial Ku and Ligase Proteins Constitute a Two-Component NHEJ Repair Machine}, volume={306}, ISSN={1095-9203}, url={http://dx.doi.org/10.1126/science.1099824}, DOI={10.1126/science.1099824}, number={5696}, journal={Science}, publisher={American Association for the Advancement of Science (AAAS)}, author={Della, Marina and Palmbos, Phillip L. and Tseng, Hui-Min and Tonkin, Louise M. and Daley, James M. and Topper, Leana M. and Pitcher, Robert S. and Tomkinson, Alan E. and Wilson, Thomas E. and Doherty, Aidan J.}, year={2004}, month=oct, pages={683–685} }