Tuesday, October 31, 2017

Proteome-wide Map of Targets of T790M-EGFR-Directed Covalent Inhibitors

Sherry Niessen,, Melissa M. Dix, Sabrina Barbas, Zachary E. Potter, Shuyan Lu, Oleg Brodsky, Simon Planken, Douglas Behenna, Chau Almaden, Ketan S. Gajiwala, Kevin Ryan, RoseAnn Ferre, Michael R. Lazear, Matthew M. Hayward, John C. Kath, Benjamin F. Cravatt

Cell Chemical Biology, 2017 doi: 10.1016/j.chembiol.2017.08.017


Patients with non-small cell lung cancers that have kinase-activating epidermal growth factor receptor (EGFR) mutations are highly responsive to first- and second-generation EGFR inhibitors. However, these patients often relapse due to a secondary, drug-resistant mutation in EGFR whereby the gatekeeper threonine is converted to methionine (T790M). Several third-generation EGFR inhibitors have been developed that irreversibly inactivate T790M-EGFR while sparing wild-type EGFR, thus reducing epithelium-based toxicities. Using chemical proteomics, we show here that individual T790M-EGFR inhibitors exhibit strikingly distinct off-target profiles in human cells. The FDA-approved drug osimertinib (AZD9291), in particular, was found to covalently modify cathepsins in cell and animal models, which correlated with lysosomal accumulation of the drug. Our findings thus show how chemical proteomics can be used to differentiate covalent kinase inhibitors based on global selectivity profiles in living systems and identify specific off-targets of these inhibitors that may affect drug activity and safety.

Chemical Specification of E3 Ubiquitin Ligase Engagement by Cysteine-Reactive Chemistry

Roman C. Sarott, Inchul You, Yen-Der Li, Sean T. Toenjes, Katherine A. Donovan, Pooreum Seo, Martha Ordonez, Woong Sub Byun, Muhammad Murtaz...