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J Med Chem. 2019 Jun 13;62(11):5330-5357. doi: 10.1021/acs.jmedchem.8b01709. Epub 2019 May 24.

Design and Synthesis of Poly(ADP-ribose) Polymerase Inhibitors: Impact of Adenosine Pocket-Binding Motif Appendage to the 3-Oxo-2,3-dihydrobenzofuran-7-carboxamide on Potency and Selectivity.

Author information

1
Department of Pharmaceutical Sciences, College of Pharmacy and Health Sciences , St. John's University , Queens , New York 11439 , United States.
2
Department of Biochemistry and Molecular Medicine , Université de Montréal , Montréal , Quebec H3T 1J4 , Canada.
3
UCSF Helen Diller Family Comprehensive Cancer Center , University of California , San Francisco , California 94158 , United States.
4
Department of Medicine , University of California , San Francisco , California 94158 , United States.

Abstract

Poly(adenosine 5'-diphosphate-ribose) polymerase (PARP) inhibitors are a class of anticancer drugs that block the catalytic activity of PARP proteins. Optimization of our lead compound 1 (( Z)-2-benzylidene-3-oxo-2,3-dihydrobenzofuran-7-carboxamide; PARP-1 IC50 = 434 nM) led to a tetrazolyl analogue (51, IC50 = 35 nM) with improved inhibition. Isosteric replacement of the tetrazole ring with a carboxyl group (60, IC50 = 68 nM) gave a promising new lead, which was subsequently optimized to obtain analogues with potent PARP-1 IC50 values (4-197 nM). PARP enzyme profiling revealed that the majority of compounds are selective toward PARP-2 with IC50 values comparable to clinical inhibitors. X-ray crystal structures of the key inhibitors bound to PARP-1 illustrated the mode of interaction with analogue appendages extending toward the PARP-1 adenosine-binding pocket. Compound 81, an isoform-selective PARP-1/-2 (IC50 = 30 nM/2 nM) inhibitor, demonstrated selective cytotoxic effect toward breast cancer gene 1 ( BRCA1)-deficient cells compared to isogenic BRCA1-proficient cells.

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