Development of Benzenesulfonamide Derivatives as Potent Glutathione Transferase Omega-1 Inhibitors
作者:Yiyue Xie、Padmaja Tummala、Aaron J. Oakley、Girdhar Singh Deora、Yuji Nakano、Melissa Rooke、Matthew E. Cuellar、Jessica M. Strasser、Jayme L. Dahlin、Michael A. Walters、Marco G. Casarotto、Philip G. Board、Jonathan B. Baell
DOI:10.1021/acs.jmedchem.9b01391
日期:2020.3.26
Glutathione transferase omega-1 (GSTO1-1) is an enzyme whose function supports the activation of interleukin (IL)-1 beta and IL-18 that are implicated in a variety of inflammatory disease states for which small-molecule inhibitors are sought. The potent reactivity of the active-site cysteine has resulted in reported inhibitors that act by covalent labeling. In this study, structure-activity relationship (SAR) elaboration of the reported GSTO1-1 inhibitor C1-27 was undertaken. Compounds were evaluated for inhibitory activity toward purified recombinant GSTO1-1 and for indicators of target engagement in cell-based assays. As covalent inhibitors, the k(inact)/K-I values of selected compounds were determined, as well as in vivo pharmacokinetics analysis. Cocrystal structures of key novel compounds in complex with GSTO1-1 were also solved. This study represents the first application of a biochemical assay for GSTO1-1 to determine k(inact)/K-I values for tested inhibitors and the most extensive set of cell-based data for a GSTO1-1 inhibitor SAR series reported to date. Our research culminated in the discovery of 25, which we propose as the preferred biochemical tool to interrogate cellular responses to GSTO1-1 inhibition.