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Title: Human DNA polymerase θ grasps the primer terminus to mediate DNA repair

Journal Article · · Nature Structural & Molecular Biology
DOI:https://doi.org/10.1038/nsmb.2993· OSTI ID:1197030
 [1];  [1];  [2];  [3];  [1]
  1. Univ. of Vermont, Burlington, VT (United States). Dept. of Microbiology and Molecular Genetics
  2. Diamond Light Source, Didcot (United Kingdom)
  3. Univ. of Texas MD Anderson Cancer Center, Smithville, TX (United States). Dept. of Epigenetics & Molecular Carcinogenesis

DNA polymerase θ protects against genomic instability via an alternative end-joining repair pathway for DNA double-strand breaks. Polymerase θ is overexpressed in breast, lung and oral cancers, and reduction of its activity in mammalian cells increases sensitivity to double-strand break–inducing agents, including ionizing radiation. Reported in this paper are crystal structures of the C-terminal polymerase domain from human polymerase θ, illustrating two potential modes of dimerization. One structure depicts insertion of ddATP opposite an abasic-site analog during translesion DNA synthesis. The second structure describes a cognate ddGTP complex. Polymerase θ uses a specialized thumb subdomain to establish unique upstream contacts to the primer DNA strand, including an interaction with the 3'-terminal phosphate from one of five distinctive insertion loops. Finally, these observations demonstrate how polymerase θ grasps the primer to bypass DNA lesions or extend poorly annealed DNA termini to mediate end-joining.

Research Organization:
Univ. of Vermont, Burlington, VT (United States)
Sponsoring Organization:
USDOE Office of Science (SC); National Inst. of Health (NIH) (United States); Cancer Prevention and Research Inst. of Texas (United States)
Contributing Organization:
Diamond Light Source, Didcot (United Kingdom); Univ. of Texas MD Anderson Cancer Center, Smithville, TX (United States)
Grant/Contract Number:
AC02-06CH11357; R01 CA052040; CA097175; RP130297; ACB-12002; AGM-12006
OSTI ID:
1197030
Journal Information:
Nature Structural & Molecular Biology, Vol. 22, Issue 4; ISSN 1545-9993
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
ENGLISH
Citation Metrics:
Cited by: 89 works
Citation information provided by
Web of Science

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Cited By (24)

Plant organellar DNA polymerases repair double-stranded breaks by microhomology-mediated end-joining journal January 2019
Distinct roles of RAD52 and POLQ in chromosomal break repair and replication stress response journal August 2019
A polar filter in DNA polymerases prevents ribonucleotide incorporation journal September 2019
Drosophila DNA polymerase theta utilizes both helicase-like and polymerase domains during microhomology-mediated end joining and interstrand crosslink repair text January 2017
Mutational signatures of non‐homologous and polymerase theta‐mediated end‐joining in embryonic stem cells journal October 2017
Structures of human DNA polymerases ν and θ expose their end game journal April 2015
Molecular basis of microhomology-mediated end-joining by purified full-length Polθ journal September 2019
Plant organellar DNA polymerases are replicative and translesion DNA synthesis polymerases journal August 2017
Family A and B DNA Polymerases in Cancer: Opportunities for Therapeutic Interventions journal January 2018
Secondary structure forming sequences drive SD-MMEJ repair of DNA double-strand breaks journal November 2017
Template and primer requirements for DNA Pol θ-mediated end joining journal July 2018
Targeting the DNA Repair Enzyme Polymerase θ in Cancer Therapy journal February 2021
Error-Prone Repair of DNA Double-Strand Breaks: ERROR-PRONE REPAIR OF DNA DSBs journal September 2015
Enzymatic synthesis of random sequences of RNA and RNA analogues by DNA polymerase theta mutants for the generation of aptamer libraries journal May 2018
Archaeal DNA polymerases: new frontiers in DNA replication and repair journal November 2018
Polymerase θ is a robust terminal transferase that oscillates between three different mechanisms during end-joining journal June 2016
Excess Polθ functions in response to replicative stress in homologous recombination-proficient cancer cells journal September 2016
Mutagenic consequences of a single G-quadruplex demonstrate mitotic inheritance of DNA replication fork barriers journal November 2015
Genomic and Molecular Landscape of DNA Damage Repair Deficiency across The Cancer Genome Atlas journal April 2018
Pyrophosphate hydrolysis is an intrinsic and critical step of the DNA synthesis reaction journal May 2018
DNA Polymerase θ: A Unique Multifunctional End-Joining Machine journal September 2016
DNA polymerase beta participates in DNA End-joining journal November 2017
Intra-Molecular Homologous Recombination of Scarless Plasmid journal March 2020
DNA Double Strand Break Repair - Related Synthetic Lethality journal May 2019