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Inhibition of Prenylated KRAS in a Lipid Environment

Jansen, Hanneke and Wartchow, Charles and Jahnke, Wolfgang and Fong, Susan and Tsang, Tiffany and Pfister, Keith and Zavorotinskaya, Tatiana and Bussiere, Dirksen and Cheng, Jan Marie and Crawford, Kenneth and Dai, Yumin and Dove, Jeffrey and Fang, Eric and Feng, Yun and Florent, Jean-Michel and Fuller, John and Gossert, Alvar and Hekmat-Nejad, Mohammad and Henry, Christelle and Klopp, Julia and Lenahan, William and Meyer, Arndt and Mishina, Yuji and Narberes, Jamie and Pardee, Gwynn and Ramurthy, Savithri and Rieffel, Sebastien and Stuart, Darrin and Subramanian, Sharadha and Tandeske, Laura and Widger, Stephania and Widmer, Armin and Winterhalter, Aurelie and Zaror, Isabel and Hardy, Stephen and Lingel, Andreas and Ma, Sylvia (2017) Inhibition of Prenylated KRAS in a Lipid Environment. PLoS ONE, 12 (4). ISSN 1932-6203

Abstract

RAS mutations lead to a constitutively active oncogenic protein that signals through multiple effector pathways. We describe a novel coupled biochemical assay that measures activation of the effector BRAF by prenylated KRASG12V in a lipid-dependent manner. Using this assay, we discovered compounds that block biochemical and cellular functions of KRASG12V with low single-digit micromolar potency. We characterized the structural basis for inhibition using NMR methods and showed that the compounds stabilized the inactive conformation of KRASG12V. When assays utilize full-length, prenylated KRAS in a lipid environment, cellular, biophysical, and biochemical potencies were similar, which demonstrates the importance of using biologically relevant constructs and assay conditions. These assays and ligands are valuable tools for further study of KRAS inhibition and drug discovery.

Item Type: Article
Keywords: GTPase, KRAS, phosphatidylserine, protein isoprenylation, biophysics, drug discovery
Date Deposited: 08 Apr 2017 00:45
Last Modified: 08 Apr 2017 00:45
URI: https://oak.novartis.com/id/eprint/31360

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