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Structural basis for $$\mathrm{APE1}$$ processing $$\mathrm{DNA}$$ damage in the nucleosome

Journal Article · · Nature Communications
 [1];  [2];  [2];  [3];  [3];  [4]
  1. University of Kansas Medical Center, Kansas City, KS (United States); OSTI
  2. University of Kansas Medical Center, Kansas City, KS (United States)
  3. University of Iowa Carver College of Medicine, Iowa City, IA (United States)
  4. University of Kansas Medical Center, Kansas City, KS (United States); University of Kansas Cancer Center, Kansas City, KS (United States)
Genomic DNA is continually exposed to endogenous and exogenous factors that promote DNA damage. Eukaryotic genomic DNA is packaged into nucleosomes, which present a barrier to accessing and effectively repairing DNA damage. The mechanisms by which DNA repair proteins overcome this barrier to repair DNA damage in the nucleosome and protect genomic stability is unknown. Here, we determine how the base excision repair (BER) endonuclease AP-endonuclease 1 (APE1) recognizes and cleaves DNA damage in the nucleosome. Kinetic assays determine that APE1 cleaves solvent-exposed AP sites in the nucleosome with 3-6 orders of magnitude higher efficiency than occluded AP sites. A cryo-electron microscopy structure of APE1 bound to a nucleosome containing a solvent-exposed AP site reveal that APE1 uses a DNA sculpting mechanism for AP site recognition, where APE1 bends the nucleosomal DNA to access the AP site. Notably, additional biochemical and structural characterization of occluded AP sites identify contacts between the nucleosomal DNA and histone octamer that prevent efficient processing of the AP site by APE1. These findings provide a rationale for the position-dependent activity of BER proteins in the nucleosome and suggests the ability of BER proteins to sculpt nucleosomal DNA drives efficient BER in chromatin.
Research Organization:
University of Kansas Medical Center, Kansas City, KS (United States)
Sponsoring Organization:
National Cancer Institute; National Institute of General Medical Science; National Institutes of Health (NIH); USDOE Office of Science (SC), Biological and Environmental Research (BER)
Grant/Contract Number:
AC05-76RL01830
OSTI ID:
1903927
Journal Information:
Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 13; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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