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Title: Mechanistic Basis for the Bypass of a Bulky DNA Adduct Catalyzed by a Y-Family DNA Polymerase

Journal Article · · Journal of the American Chemical Society
DOI:https://doi.org/10.1021/jacs.5b08027· OSTI ID:1240185
 [1];  [1];  [2];  [3];  [3];  [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 Biophysics Ph.D. Program
  3. Univ. of Connecticut, Storrs, CT (United States). Dept. of Chemistry

1-Nitropyrene (1-NP), an environmental pollutant, induces DNA damage in vivo and is considered to be carcinogenic. The DNA adducts formed by the 1-NP metabolites stall replicative DNA polymerases but are presumably bypassed by error-prone Y-family DNA polymerases at the expense of replication fidelity and efficiency in vivo. Our running start assays confirmed that a site-specifically placed 8-(deoxyguanosin-N2-yl)-1-aminopyrene (dG1,8), one of the DNA adducts derived from 1-NP, can be bypassed by Sulfolobus solfataricus DNA polymerase IV (Dpo4), although this representative Y-family enzyme was paused strongly by the lesion. Pre-steady-state kinetic assays were employed to determine the low nucleotide incorporation fidelity and establish a minimal kinetic mechanism for the dG1,8 bypass by Dpo4. To reveal a structural basis for dCTP incorporation opposite dG1,8, we solved the crystal structures of the complexes of Dpo4 and DNA containing a templating dG1,8 lesion in the absence or presence of dCTP. The Dpo4·DNA-dG1,8 binary structure shows that the aminopyrene moiety of the lesion stacks against the primer/template junction pair, while its dG moiety projected into the cleft between the Finger and Little Finger domains of Dpo4. In the Dpo4·DNA-dG1,8·dCTP ternary structure, the aminopyrene moiety of the dG1,8 lesion, is sandwiched between the nascent and junction base pairs, while its base is present in the major groove. Moreover, dCTP forms a Watson–Crick base pair with dG, two nucleotides upstream from the dG1,8 site, creating a complex for “-2” frameshift mutation. Mechanistically, these crystal structures provide additional insight into the aforementioned minimal kinetic mechanism.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1240185
Journal Information:
Journal of the American Chemical Society, Vol. 137, Issue 37; ISSN 0002-7863
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
ENGLISH
Citation Metrics:
Cited by: 9 works
Citation information provided by
Web of Science

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Cited By (1)

Pre-steady-state kinetic investigation of bypass of a bulky guanine lesion by human Y-family DNA polymerases journal October 2016