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K-RAS is known as the most frequently mutated oncogene. However, the development of conventional K-RAS inhibitors has been extremely challenging, with a mutation-specific inhibitor reaching clinical trials only recently. Targeted proteolysis has emerged as a new modality in drug discovery to tackle undruggable targets. Our laboratory has developed a system for targeted proteolysis using peptidic high-affinity binders, called "AdPROM." Here, we used CRISPR/Cas9 technology to knock in a GFP tag on the native K-RAS gene in A549 adenocarcinoma (A549GFPKRAS) cells and constructed AdPROMs containing high-affinity GFP or H/K-RAS binders. Expression of GFP-targeting AdPROM in A549GFPKRAS led to robust proteasomal degradation of endogenous GFP-K-RAS, while expression of anti-HRAS-targeting AdPROM in different cell lines resulted in the degradation of both GFP-tagged and untagged K-RAS, and untagged H-RAS. Our findings imply that endogenous RAS proteins can be targeted for proteolysis, supporting the idea of an alternative therapeutic approach to these undruggable targets. Copyright © 2020 The Authors. Published by Elsevier Ltd.. All rights reserved.

Citation

Sascha Röth, Thomas J Macartney, Agnieszka Konopacka, Kwok-Ho Chan, Houjiang Zhou, Markus A Queisser, Gopal P Sapkota. Targeting Endogenous K-RAS for Degradation through the Affinity-Directed Protein Missile System. Cell chemical biology. 2020 Sep 17;27(9):1151-1163.e6

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PMID: 32668202

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