Methyl-substitution of an iminohydantoin spiropiperidine beta-secretase (BACE-1) inhibitor has a profound effect on its potency.
Egbertson, M., McGaughey, G.B., Pitzenberger, S.M., Stauffer, S.R., Coburn, C.A., Stachel, S.J., Yang, W., Barrow, J.C., Neilson, L.A., McWherter, M., Perlow, D., Fahr, B., Munshi, S., Allison, T.J., Holloway, K., Selnick, H.G., Yang, Z., Swestock, J., Simon, A.J., Sankaranarayanan, S., Colussi, D., Tugusheva, K., Lai, M.T., Pietrak, B., Haugabook, S., Jin, L., Chen, I.W., Holahan, M., Stranieri-Michener, M., Cook, J.J., Vacca, J., Graham, S.L.(2015) Bioorg Med Chem Lett 25: 4812-4819
- PubMed: 26195137 
- DOI: 10.1016/j.bmcl.2015.06.082
- Primary Citation of Related Structures:  
4ZPE, 4ZPF, 4ZPG - PubMed Abstract: 
The IC50 of a beta-secretase (BACE-1) lead compound was improved ∼200-fold from 11 μM to 55 nM through the addition of a single methyl group. Computational chemistry, small molecule NMR, and protein crystallography capabilities were used to compare t ...