Identification of BRaf-Sparing Amino-Thienopyrimidines with Potent IRE1α Inhibitory Activity.

ABSTRACT: Amino-quinazoline BRaf kinase inhibitor 2 was identified from a library screen as a modest inhibitor of the unfolded protein response (UPR) regulating potential anticancer target IRE1α. A combination of crystallographic and conformational considerations were used to guide structure-based attenuation of BRaf activity and optimization of IRE1α potency. Quinazoline 6-position modifications were found to provide up to 100-fold improvement in IRE1α cellular potency but were ineffective at reducing BRaf activity. A salt bridge contact with Glu651 in IRE1α was then targeted to build in selectivity over BRaf which instead possesses a histidine in this position (His539). Torsional angle analysis revealed that the quinazoline hinge binder core was ill-suited to accommodate the required confor

SUBMITTER: Beveridge RE 

PROVIDER: S-EPMC7734639 | biostudies-literature | 2020 Dec

REPOSITORIES: biostudies-literature