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Title: An autoinhibited state of 53BP1 revealed by small molecule antagonists and protein engineering

Journal Article · · Nature Communications
ORCiD logo [1]; ORCiD logo [1];  [2]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [3];  [4]; ORCiD logo [5];  [6]; ORCiD logo [6]; ORCiD logo [6]; ORCiD logo [2]; ORCiD logo [1]
  1. Mayo Clinic, Rochester, MN (United States)
  2. Dana-Farber Cancer Institute, Boston, MA (United States)
  3. Univ. of Minnesota, Austin, MN (United States)
  4. Cornell Univ., Ithaca, NY (United States)
  5. Institut de Cancerologie Strasbourg Europe, Strasbourg (France)
  6. Univ. of North Carolina, Chapel Hill, NC (United States)

The recruitment of 53BP1 to chromatin, mediated by its recognition of histone H4 dimethylated at lysine 20 (H4K20me2), is important for DNA double-strand break repair. Using a series of small molecule antagonists, we demonstrate a conformational equilibrium between an open and a pre-existing lowly populated closed state of 53BP1 in which the H4K20me2 binding surface is buried at the interface between two interacting 53BP1 molecules. In cells, these antagonists inhibit the chromatin recruitment of wild type 53BP1, but do not affect 53BP1 variants unable to access the closed conformation despite preservation of the H4K20me2 binding site. Thus, this inhibition operates by shifting the conformational equilibrium toward the closed state. Our work therefore identifies an auto-associated form of 53BP1—autoinhibited for chromatin binding—that can be stabilized by small molecule ligands encapsulated between two 53BP1 protomers. Such ligands are valuable research tools to study the function of 53BP1 and have the potential to facilitate the development of new drugs for cancer therapy.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER); National Science Foundation (NSF); National Institutes of Health (NIH)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
2423280
Journal Information:
Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 14; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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