Title: Selective small molecule PARG inhibitor causes replication fork stalling and cancer cell death

Journal Article · · Nature Communications
 [1];  [2]; ORCiD logo [3];  [4];  [3]; ORCiD logo [3];  [5];  [6];  [7];  [3];  [8]; ORCiD logo [3];  [9]; ORCiD logo [8];  [10]; ORCiD logo [5];  [9]; ORCiD logo [11]; ORCiD logo [6];  [3] more »; ORCiD logo [3] « less
  1. Univ. of Texas, Houston, TX (United States). Depts. of Cancer Biology and of Molecular and Cellular Oncology; DOE/OSTI
  2. Univ. of Texas, Houston, TX (United States). Depts. of Cancer Biology and of Molecular and Cellular Oncology
  3. Univ. of Texas, Houston, TX (United States). Depts. of Cancer Biology and of Molecular and Cellular Oncology
  4. Univ. of Arkansas, Little Rock, AR (United States). Dept. of Chemistry; Univ. of Arkansas for Medical Sciences, Little Rock, AR (United States). Dept. of Pharmaceutical Sciences
  5. Harvard Univ., Cambridge, MA (United States). School of Public Health
  6. Univ. of Arkansas, Little Rock, AR (United States). Dept. of Chemistry; Univ. of Arkansas for Medical Sciences, Little Rock, AR (United States). Dept. of Pharmaceutical Sciences
  7. Univ. of Cincinnati, OH (United States). Dept. of Chemistry
  8. Univ. of Texas, Houston, TX (United States). Depts. of Cancer Biology and of Molecular and Cellular Oncology; Univ. of Texas, Houston, TX (United States). UTHealth Graduate School of Biomedical Sciences
  9. Washington Univ., St. Louis, MO (United States). School of Medicine, Dept. of Biochemistry and Molecular Biophysics
  10. Univ. of Texas, Houston, TX (United States). Depts. of Cancer Biology and of Molecular and Cellular Oncology; China Medical University, (Taiwan). Graduate Institute of Biomedical Sciences and Center for Molecular Medicine, and Office of the President
  11. Univ. of Cincinnati, OH (United States). Dept. of Chemistry; Washington Univ., St. Louis, MO (United States). School of Medicine, Dept. of Biochemistry and Molecular Biophysics

Poly(ADP-ribose)ylation (PARylation) by PAR polymerase 1 (PARP1) and PARylation removal by poly(ADP-ribose) glycohydrolase (PARG) critically regulate DNA damage responses; yet, conflicting reports obscure PARG biology and its impact on cancer cell resistance to PARP1 inhibitors. Here, we found that PARG expression is upregulated in many cancers. We employed chemical library screening to identify and optimize methylxanthine derivatives as selective bioavailable PARG inhibitors. Multiple crystal structures reveal how substituent positions on the methylxanthine core dictate binding modes and inducible-complementarity with a PARG-specific tyrosine clasp and arginine switch, supporting inhibitor specificity and a competitive inhibition mechanism. Cell-based assays show selective PARG inhibition and PARP1 hyperPARylation. Moreover, our PARG inhibitor sensitizes cells to radiation-induced DNA damage, suppresses replication fork progression and impedes cancer cell survival. In PARP inhibitor-resistant A172 glioblastoma cells, our PARG inhibitor shows comparable killing to Nedaplatin, providing further proof-of-concept that selectively inhibiting PARG can impair cancer cell survival.

Research Organization:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Organization:
Office of Science (SC), Biological and Environmental Research (BER); USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-76SF00515
OSTI ID:
1624221
Journal Information:
Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 10; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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Poly(ADP-ribose) glycohydrolase as a target for neuroprotective intervention: assessment of currently available pharmacological tools journal August 2004
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The structure of human ADP-ribosylhydrolase 3 (ARH3) provides insights into the reversibility of protein ADP-ribosylation journal October 2006
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Tannic acid, an inhibitor of poly(ADP-ribose) glycohydrolase, sensitizes ovarian carcinoma cells to cisplatin journal January 2012
PARPs and ADP-ribosylation: recent advances linking molecular functions to biological outcomes journal January 2017
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Monitoring Drug Target Engagement in Cells and Tissues Using the Cellular Thermal Shift Assay journal July 2013
Poly(ADP-Ribosyl) Glycohydrolase Prevents the Accumulation of Unusual Replication Structures during Unperturbed S Phase journal December 2014
Poly(ADP-Ribose) Polymerase 1 Accelerates Single-Strand Break Repair in Concert with Poly(ADP-Ribose) Glycohydrolase journal June 2007
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The ups and downs of tannins as inhibitors of poly(ADP-ribose)glycohydrolase text January 2011
Macrodomain-containing proteins are new mono-ADP-ribosylhydrolases text January 2013
Selective Loss of PARG Restores PARylation and Counteracts PARP Inhibitor-Mediated Synthetic Lethality. text January 2018

Cited By (1)

Activity-Based Screening Assay for Mono-ADP-Ribosylhydrolases journal June 2020