Targeting Endogenous K-RAS for Degradation through the Affinity-Directed Protein Missile System.

Cell Chemical Biology
Sascha RöthGopal P Sapkota

Abstract

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.

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Methods Mentioned

BETA
nucleotide exchange
ubiquitination
immunoprecipitation
neddylation
flow cytometry
PCR
scraping
Assay
FACS

Software Mentioned

OMERO
JalView
AdPROM
ImageLab
Clustal Omega
softWoRx Imaging
Mascot
dTAG
Proteome Discoverer

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