PMID: 27918638

Authors:

Peng B, Thorsell AG, Karlberg T, Schuler H, Yao SQ

Title:

Small Molecule Microarray Based Discovery of PARP14 Inhibitors.

Journal:

Angew Chem Int Ed Engl. 2016 Dec 5. doi: 10.1002/anie.201609655.

Abstract:

Poly(ADP-ribose) polymerases (PARPs) are key enzymes in a variety of cellular processes. Most small-molecule PARP inhibitors developed to date have been against PARP1, and suffer from poor selectivity. PARP14 has recently emerged as a potential therapeutic target, but its inhibitor development has trailed behind. Herein, we describe a small molecule microarray-based strategy for high-throughput synthesis, screening of >1000 potential bidentate inhibitors of PARPs, and the successful discovery of a potent PARP14 inhibitor H10 with >20-fold selectivity over PARP1. Co-crystallization of the PARP14/H10 complex indicated H10 bound to both the nicotinamide and the adenine subsites. Further structure-activity relationship studies identified important binding elements in the adenine subsite. In tumor cells, H10 was able to chemically knockdown endogenous PARP14 activities.