Crossref journal-article
American Association for the Advancement of Science (AAAS)
Science (221)
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.

Bibliography

Della, M., Palmbos, P. L., Tseng, H.-M., Tonkin, L. M., Daley, J. M., Topper, L. M., Pitcher, R. S., Tomkinson, A. E., Wilson, T. E., & Doherty, A. J. (2004). Mycobacterial Ku and Ligase Proteins Constitute a Two-Component NHEJ Repair Machine. Science, 306(5696), 683–685.

Authors 10
  1. Marina Della (first)
  2. Phillip L. Palmbos (additional)
  3. Hui-Min Tseng (additional)
  4. Louise M. Tonkin (additional)
  5. James M. Daley (additional)
  6. Leana M. Topper (additional)
  7. Robert S. Pitcher (additional)
  8. Alan E. Tomkinson (additional)
  9. Thomas E. Wilson (additional)
  10. Aidan J. Doherty (additional)
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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)
Funders 0

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@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} }