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Structural basis of DNA synthesis opposite 8-oxoguanine by human PrimPol primase-polymerase

Journal Article · · Nature Communications
 [1];  [2];  [3];  [2];  [2];  [1]
  1. Icahn School of Medicine at Mount Sinai, New York, NY (United States)
  2. Univ. of Texas Medical Branch, Galveston, TX (United States)
  3. Icahn School of Medicine at Mount Sinai, New York, NY (United States); Univ. of Texas Health at San Antonio, TX (United States)

PrimPol is a human DNA polymerase-primase that localizes to mitochondria and nucleus and bypasses the major oxidative lesion 7,8-dihydro-8-oxoguanine (oxoG) via translesion synthesis, in mostly error-free manner. We present structures of PrimPol insertion complexes with a DNA template-primer and correct dCTP or erroneous dATP opposite the lesion, as well as extension complexes with C or A as a 3'–terminal primer base. We show that during the insertion of C and extension from it, the active site is unperturbed, reflecting the readiness of PrimPol to accommodate oxoG(anti). The misinsertion of A opposite oxoG(syn) also does not alter the active site, and is likely less favorable due to lower thermodynamic stability of the oxoG(syn)•A base-pair. During the extension step, oxoG(syn) induces an opening of its base-pair with A or misalignment of the 3'-A primer terminus. Together, the structures show how PrimPol accurately synthesizes DNA opposite oxidatively damaged DNA in human cells.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Organization:
USDOE Office of Science (SC); NIH
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1810833
Journal Information:
Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 12; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
ENGLISH

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