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Title: Viewing Human DNA Polymerase β Faithfully and Unfaithfully Bypass an Oxidative Lesion by Time-Dependent Crystallography

Journal Article · · Journal of the American Chemical Society
DOI:https://doi.org/10.1021/jacs.5b02109· OSTI ID:1186920
 [1];  [1];  [2];  [2]
  1. The Ohio State Univ., Columbus, OH (United States). Dept of Chemistry and Biochemistry
  2. The Ohio State Univ., Columbus, OH (United States). Dept of Chemistry and Biochemistry; The Ohio State Univ., Columbus, OH (United States). Biophysics Programs

One common oxidative DNA lesion, 8-oxo-7,8-dihydro-2'-deoxyguanine (8-oxoG), is highly mutagenic in vivo due to its anti-conformation forming a Watson–Crick base pair with correct deoxycytidine 5'-triphosphate (dCTP) and its syn-conformation forming a Hoogsteen base pair with incorrect deoxyadenosine 5'-triphosphate (dATP). Here in this article, we utilized time-resolved X-ray crystallography to follow 8-oxoG bypass by human DNA polymerase β (hPolβ). In the 12 solved structures, both Watson–Crick (anti-8-oxoG:anti-dCTP) and Hoogsteen (syn-8-oxoG:anti-dATP) base pairing were clearly visible and were maintained throughout the chemical reaction. Additionally, a third Mg2+ appeared during the process of phosphodiester bond formation and was located between the reacting α- and β-phosphates of the dNTP, suggesting its role in stabilizing reaction intermediates. After phosphodiester bond formation, hPolβ reopened its conformation, pyrophosphate was released, and the newly incorporated primer 3'-terminal nucleotide stacked, rather than base paired, with 8-oxoG. These structures provide the first real-time pictures, to our knowledge, of how a polymerase correctly and incorrectly bypasses a DNA lesion.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Organization:
National Institutes of Health (NIH); National Science Foundation (NSF); USDOE Office of Science (SC)
Grant/Contract Number:
AC02-06CH11357; MCB-0960961; ES009127; ES024585
OSTI ID:
1186920
Journal Information:
Journal of the American Chemical Society, Vol. 137, Issue 15; ISSN 0002-7863
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
ENGLISH
Citation Metrics:
Cited by: 38 works
Citation information provided by
Web of Science

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Cited By (11)

Time-lapse crystallography snapshots of a double-strand break repair polymerase in action journal August 2017
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
Catalytic mechanism of DNA polymerases—Two metal ions or three? journal December 2018
Capture of a third Mg2+ is essential for catalyzing DNA synthesis journal June 2016
Modulating the DNA polymerase β reaction equilibrium to dissect the reverse reaction journal July 2017
2.0 Å resolution crystal structure of human polκ reveals a new catalytic function of N-clasp in DNA replication journal October 2018
Intrinsic cleavage of RNA polymerase II adopts a nucleobase-independent mechanism assisted by transcript phosphate journal February 2019
Calcium-driven DNA synthesis by a high-fidelity DNA polymerase journal October 2017
Structural basis for the D-stereoselectivity of human DNA polymerase β journal April 2017
Capturing a mammalian DNA polymerase extending from an oxidized nucleotide journal April 2017