Methyl-substitution of an iminohydantoin spiropiperidine β-secretase (BACE-1) inhibitor has a profound effect on its potency
作者:Melissa Egbertson、Georgia B. McGaughey、Steven M. Pitzenberger、Shaun R. Stauffer、Craig A. Coburn、Shawn J. Stachel、Wenjin Yang、James C. Barrow、Lou Anne Neilson、Melody McWherter、Debra Perlow、Bruce Fahr、Sanjeev Munshi、Timothy J. Allison、Katharine Holloway、Harold G. Selnick、ZhiQiang Yang、John Swestock、Adam J. Simon、Sethu Sankaranarayanan、Dennis Colussi、Katherine Tugusheva、Ming-Tain Lai、Beth Pietrak、Shari Haugabook、Lixia Jin、I.-W. Chen、Marie Holahan、Maria Stranieri-Michener、Jacquelynn J. Cook、Joseph Vacca、Samuel L. Graham
DOI:10.1016/j.bmcl.2015.06.082
日期:2015.11
The IC50 of a beta-secretase (BACE-1) lead compound was improved similar to 200-fold from 11 mu M to 55 nM through the addition of a single methyl group. Computational chemistry, small molecule NMR, and protein crystallography capabilities were used to compare the solution conformation of the ligand under varying pH conditions to its conformation when bound in the active site. Chemical modification then explored available binding pockets adjacent to the ligand. A strategically placed methyl group not only maintained the required pKa of the piperidine nitrogen and filled a small hydrophobic pocket, but more importantly, stabilized the conformation best suited for optimized binding to the receptor. (C) 2015 Elsevier Ltd. All rights reserved.