Faculty, Staff and Student Publications
Language
English
Publication Date
12-21-2022
Journal
ACS Bio & Med Chem Au
DOI
10.1021/acsbiomedchemau.2c00045
PMID
37101428
PMCID
PMC10125367
PubMedCentral® Posted Date
September 2022
PubMedCentral® Full Text Version
Post-print
Abstract
We describe a small molecule ligand ACA-14 (2-hydroxy-5-{[(2-phenylcyclopropyl) carbonyl] amino} benzoic acid) as an initial lead for the development of direct inhibitors of KRAS, a notoriously difficult anticancer drug target. We show that the compound binds to KRAS near the switch regions with affinities in the low micromolar range and exerts different effects on KRAS interactions with binding partners. Specifically, ACA-14 impedes the interaction of KRAS with its effector Raf and reduces both intrinsic and SOS-mediated nucleotide exchange rates. Likely as a result of these effects, ACA-14 inhibits signal transduction through the MAPK pathway in cells expressing mutant KRAS and inhibits the growth of pancreatic and colon cancer cells harboring mutant KRAS. We thus propose compound ACA-14 as a useful initial lead for the development of broad-acting inhibitors that target multiple KRAS mutants and simultaneously deplete the fraction of GTP-loaded KRAS while abrogating the effector-binding ability of the already GTP-loaded fraction.
Keywords
Ras protein, inhibitor, signal transduction, anticancer drug, allosteric inhibition
Published Open-Access
yes
Recommended Citation
Pagba, Cynthia V; Gupta, Amit K; Naji, Ali K; et al., "KRAS Inhibitor that Simultaneously Inhibits Nucleotide Exchange Activity and Effector Engagement" (2022). Faculty, Staff and Student Publications. 1259.
https://digitalcommons.library.tmc.edu/uthmed_docs/1259