Chimno Ihuoma Nnadi, Meredith L. Jenkins, Daniel R. Gentile, Leslie A. Bateman, Daniel Zaidman, Trent E. Balius, Daniel K. Nomura, John E. Burke, Kevan M. Shokat, and Nir London
J. Chem. Inf. Model., Just Accepted Manuscript
The success of targeted covalent inhibitors in the global pharmaceutical industry has led to a resurgence of covalent drug discovery. However, covalent inhibitor design for flexible binding sites remains a difficult task due to lack of methodological development. Here, we compared covalent docking to empirical electrophile screening, against the highly dynamic target K-RasG12C. While the overall hit-rate of both methods was comparable, we were able to rapidly progress a docking hit to a potent irreversible covalent inhibitor that modifies the inactive, GDP-bound state of K-RasG12C. Hydrogen-deuterium exchange mass spectrometry was used to probe the protein dynamics of compound binding to the switch-II pocket and subsequent destabilization of the nucleotide-binding region. SOS-mediated nucleotide exchange assays showed that, contrary to prior switch-II pocket inhibitors, these compounds appear to accelerate nucleotide exchange. This study highlights the efficiency of covalent docking as a tool for the discovery of chemically novel hits against challenging targets.
A blog highlighting recent publications in the area of covalent modification of proteins, particularly relating to covalent-modifier drugs. @CovalentMod on Twitter and @email@example.com on Mastodon
Monday, January 15, 2018
Novel K-Ras G12C Switch-II covalent binders destabilize Ras and accelerate nucleotide exchange
Covalent drug discovery using sulfur(VI) fluoride exchange warheads
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Jian Ding, Guo Li, Hejun Liu, Lulu Liu, Ying Lin, Jingyan Gao, Guoqiang Zhou, Lingling Shen, Mengxi Zhao, Yanyan Yu, Weihui Guo, Ulrich Homm...