Structural basis for a novel mechanism of DNA bridging and alignment in eukaryotic DSB DNA repair
Gouge, Jerome and Rosario, S. and Romain, F. and Poitevin, F. and Béguin, P. and Delarue, M. (2015) Structural basis for a novel mechanism of DNA bridging and alignment in eukaryotic DSB DNA repair. The EMBO Journal 34 (8), pp. 1126-42. ISSN 0261-4189.
Text
Gouge et al. - 2015 - Structural basis for a novel mechanism of DNA brid.pdf - Published Version of Record Restricted to Repository staff only Download (3MB) |
Abstract
Eukaryotic DNA polymerase mu of the PolX family can promote the association of the two 3'-protruding ends of a DNA double-strand break (DSB) being repaired (DNA synapsis) even in the absence of the core non-homologous end-joining (NHEJ) machinery. Here, we show that terminal deoxynucleotidyltransferase (TdT), a closely related PolX involved in V(D)J recombination, has the same property. We solved its crystal structure with an annealed DNA synapsis containing one micro-homology (MH) base pair and one nascent base pair. This structure reveals how the N-terminal domain and Loop 1 of Tdt cooperate for bridging the two DNA ends, providing a templating base in trans and limiting the MH search region to only two base pairs. A network of ordered water molecules is proposed to assist the incorporation of any nucleotide independently of the in trans templating base. These data are consistent with a recent model that explains the statistics of sequences synthesized in vivo by Tdt based solely on this dinucleotide step. Site-directed mutagenesis and functional tests suggest that this structural model is also valid for Pol mu during NHEJ.
Metadata
Item Type: | Article |
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School: | Birkbeck Faculties and Schools > Faculty of Science > School of Natural Sciences |
Research Centres and Institutes: | Structural Molecular Biology, Institute of (ISMB) |
Depositing User: | Jerome Gouge |
Date Deposited: | 05 Mar 2020 17:55 |
Last Modified: | 02 Aug 2023 17:57 |
URI: | https://eprints.bbk.ac.uk/id/eprint/31009 |
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