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National Institute of Environmental Health Sciences

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Publication Detail

Title: Screen Targeting Lung and Prostate Cancer Oncogene Identifies Novel Inhibitors of RGS17 and Problematic Chemical Substructures.

Authors: Bodle, Christopher R; Schamp, Josephine H; O'Brien, Joseph B; Hayes, Michael P; Wu, Meng; Doorn, Jonathan A; Roman, David L

Published In SLAS Discov, (2018 04)

Abstract: Regulator of G protein signaling (RGS) proteins temporally regulate heterotrimeric G protein signaling cascades elicited by G protein-coupled receptor activation and thus are essential for cell homeostasis. The dysregulation of RGS protein expression has been linked to several pathologies, spurring discovery efforts to identify small-molecule inhibitors of these proteins. Presented here are the results of a high-throughput screening (HTS) campaign targeting RGS17, an RGS protein reported to be inappropriately upregulated in several cancers. A screen of over 60,000 small molecules led to the identification of five hit compounds that inhibit the RGS17-Gαo protein-protein interaction. Chemical and biochemical characterization demonstrated that three of these hits inhibited the interaction through the decomposition of parent compound into reactive products under normal chemical library storage/usage conditions. Compound substructures susceptible to decomposition are reported and the decomposition process characterized, adding to the armamentarium of tools available to the screening field, allowing for the conservation of resources in follow-up efforts and more efficient identification of potentially decomposed compounds. Finally, analogues of one hit compound were tested, and the results establish the first ever structure-activity relationship (SAR) profile for a small-molecule inhibitor of RGS17.

PubMed ID: 29351497 Exiting the NIEHS site

MeSH Terms: Antineoplastic Agents/pharmacology*; Heterotrimeric GTP-Binding Proteins/genetics; High-Throughput Screening Assays/methods; Humans; Lung Neoplasms/drug therapy*; Lung Neoplasms/genetics*; Male; Oncogenes/drug effects*; Oncogenes/genetics; Prostatic Neoplasms/drug therapy*; Prostatic Neoplasms/genetics*; Protein Interaction Maps/drug effects; RGS Proteins/antagonists & inhibitors*; RGS Proteins/genetics; Receptors, G-Protein-Coupled/genetics; Signal Transduction/drug effects; Small Molecule Libraries/pharmacology

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