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

Journal Article · · Nature Communications
 [1];  [1]; ORCiD logo [2];  [3];  [2]; ORCiD logo [2];  [4];  [5];  [6];  [2];  [7]; ORCiD logo [2];  [8]; ORCiD logo [9];  [10]; ORCiD logo [4];  [8]; ORCiD logo [11]; ORCiD logo [5];  [2] more »; ORCiD logo [2] « less
  1. Univ. of Texas, Houston, TX (United States). Depts. of Cancer Biology and of Molecular and Cellular Oncology
  2. Univ. of Texas, Houston, TX (United States). Depts. of Cancer Biology and of Molecular and Cellular Oncology
  3. 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
  4. Harvard Univ., Cambridge, MA (United States). School of Public Health
  5. 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
  6. Univ. of Cincinnati, OH (United States). Dept. of Chemistry
  7. 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
  8. Washington Univ., St. Louis, MO (United States). School of Medicine, Dept. of Biochemistry and Molecular Biophysics
  9. 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
  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 Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); Office of Science (SC), Biological and Environmental Research (BER)
Grant/Contract Number:
AC02-76SF00515; R01 CA200231; P01 CA092584; R35CA22043; P41 GM103393; ACI-1134872
OSTI ID:
1624221
Journal Information:
Nature Communications, Vol. 10, Issue 1; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 59 works
Citation information provided by
Web of Science

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The expanding role of poly(ADP-ribose) metabolism: current challenges and new perspectives journal April 2006
Poly(ADP-ribose) glycohydrolase as a target for neuroprotective intervention: assessment of currently available pharmacological tools journal August 2004
Structure of mammalian poly(ADP-ribose) glycohydrolase reveals a flexible tyrosine clasp as a substrate-binding element journal May 2012
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Increased susceptibility of poly(ADP-ribose) polymerase-1 knockout mice to nitrosamine carcinogenicity journal January 2001
Stabilization of Reversed Replication Forks by Telomerase Drives Telomere Catastrophe journal January 2018
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PARG activity mediates intestinal injury induced by splanchnic artery occlusion and reperfusion journal January 2005
Selective Small Molecule Inhibition of Poly(ADP-Ribose) Glycohydrolase (PARG) journal January 2012
Targeting dePARylation selectively suppresses DNA repair–defective and PARP inhibitor–resistant malignancies journal April 2019
Deficiency of terminal ADP-ribose protein glycohydrolase TARG1/C6orf130 in neurodegenerative disease journal March 2013
Selective Loss of PARG Restores PARylation and Counteracts PARP Inhibitor-Mediated Synthetic Lethality. text January 2018
Visualization of poly(ADP-ribose) bound to PARG reveals inherent balance between exo- and endo-glycohydrolase activities journal August 2013
The Ups and Downs of Tannins as Inhibitors of Poly(ADP-Ribose)glycohydrolase journal February 2011
PARG dysfunction enhances DNA double strand break formation in S-phase after alkylation DNA damage and augments different cell death pathways journal June 2013
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Poly(ADP-ribose) (PAR) polymer is a death signal journal November 2006
Failure to degrade poly(ADP-ribose) causes increased sensitivity to cytotoxicity and early embryonic lethality journal December 2004
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Cited By (1)

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