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Title: Uncovering the polymerase-induced cytotoxicity of an oxidized nucleotide

Journal Article · · Nature (London)
DOI:https://doi.org/10.1038/nature13886· OSTI ID:1168869
 [1];  [1];  [1];  [1];  [2];  [3];  [1]
  1. National Inst. of Environmental Health Sciences (NIEHS), Research Triangle Park, NC (United States). Lab. of Structural Biology
  2. New York Univ. (NYU), NY (United States). Courant Inst. of Mathematical Sciences, Dept. of Chemistry
  3. New York Univ. (NYU), NY (United States). Courant Inst. of Mathematical Sciences, Dept. of Chemistry

Oxidative stress promotes genomic instability and human diseases. A common oxidized nucleoside is 8-oxo-7,8-dihydro-2’-deoxyguanosine found both in DNA (8-oxo-G) and as a free nucleotide (8-oxo-dGTP). Nucleotide pools are especially vulnerable to oxidative damage. Therefore cells encode an enzyme (MutT/MTH1) that removes free oxidized nucleotides. This cleansing function is required for cancer cell survival and to modulate E. coli antibiotic sensitivity in a DNA polymerase (pol)-dependent manner. How polymerase discriminates between damaged and non-damaged nucleotides is not well understood. This analysis is essential given the role of oxidized nucleotides in mutagenesis, cancer therapeutics, and bacterial antibiotics. Even with cellular sanitizing activities, nucleotide pools contain enough 8-oxo-dGTP to promote mutagenesis. This arises from the dual coding potential where 8-oxo-dGTP(anti) base pairs with cytosine (Cy) and 8-oxodGTP(syn) utilizes its Hoogsteen edge to base pair with adenine (Ad). Here in this paper we utilized time-lapse crystallography to follow 8-oxo-dGTP insertion opposite Ad or Cy with human DNA pol β, to reveal that insertion is accommodated in either the syn- or anti-conformation, respectively. For 8-oxo-dGTP(anti) insertion, a novel divalent metal relieves repulsive interactions between the adducted guanine base and the triphosphate of the oxidized nucleotide. With either templating base, hydrogen bonding interactions between the bases are lost as the enzyme reopens after catalysis, leading to a cytotoxic nicked DNA repair intermediate. Combining structural snapshots with kinetic and computational analysis reveals how 8-oxodGTP utilizes charge modulation during insertion that can lead to a blocked DNA repair intermediate.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Institutes of Health (NIH)
Grant/Contract Number:
W-31-109-Eng-38; 1U19CA105010
OSTI ID:
1168869
Journal Information:
Nature (London), Vol. 517, Issue 7536; ISSN 0028-0836
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
ENGLISH
Citation Metrics:
Cited by: 120 works
Citation information provided by
Web of Science

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Cited By (22)

Catalytic mechanism of DNA polymerases—Two metal ions or three? journal December 2018
Exploring the mechanism of DNA polymerases by analyzing the effect of mutations of active site acidic groups in Polymerase β: The Proton Transport Mechanism of Pol β journal August 2016
Role of AP-endonuclease (Ape1) active site residues in stabilization of the reactant enzyme-DNA complex journal February 2018
Insights into DNA polymerase δ’s mechanism for accurate DNA replication journal February 2019
Modulating the DNA polymerase β reaction equilibrium to dissect the reverse reaction journal July 2017
Oxidative guanine base damage regulates human telomerase activity journal November 2016
Time-lapse crystallography snapshots of a double-strand break repair polymerase in action journal August 2017
Intrinsic cleavage of RNA polymerase II adopts a nucleobase-independent mechanism assisted by transcript phosphate journal February 2019
Location analysis of 8-oxo-7,8-dihydroguanine in DNA by polymerase-mediated differential coding journal January 2019
Molecular and structural characterization of oxidized ribonucleotide insertion into DNA by human DNA polymerase β journal December 2019
A guardian residue hinders insertion of a Fapy•dGTP analog by modulating the open-closed DNA polymerase transition journal January 2019
Capture of a third Mg2+ is essential for catalyzing DNA synthesis journal June 2016
A new paradigm of DNA synthesis: three-metal-ion catalysis journal September 2016
Slow Replication Fork Velocity of Homologous Recombination-Defective Cells Results from Endogenous Oxidative Stress journal May 2016
A fidelity mechanism in DNA polymerase lambda promotes error‐free bypass of 8‐oxo‐ dG journal July 2016
Reading and Misreading 8-oxoguanine, a Paradigmatic Ambiguous Nucleobase journal May 2019
Coping with Reactive Oxygen Species to Ensure Genome Stability in Escherichia coli journal November 2018
Estimation of the Mutagenic Potential of 8-Oxog in Nuclear Extracts of Mouse Cells Using the “Framed Mirror” Method journal January 2020
Molecular snapshots of APE1 proofreading mismatches and removing DNA damage journal January 2018
Insights into Watson–Crick/Hoogsteen breathing dynamics and damage repair from the solution structure and dynamic ensemble of DNA duplexes containing m1A journal March 2017
Capturing a mammalian DNA polymerase extending from an oxidized nucleotide journal April 2017
Echinacoside induces apoptotic cancer cell death by inhibiting the nucleotide pool sanitizing enzyme MTH1 journal December 2015