PMID: 20875739

Authors:

Blackburn C, Barrett C, Blank JL, Bruzzese FJ, Bump N, Dick LR, Fleming P, Garcia K, Hales P, Hu Z, Jones M, Liu JX, Sappal DS, Sintchak MD, Tsu C, Gigstad KM

Title:

Optimization of a series of dipeptides with a P3 threonine residue as non-covalent inhibitors of the chymotrypsin-like activity of the human 20S proteasome.

Journal:

Bioorg Med Chem Lett. 2010 Nov 15;20(22):6581-6. Epub 2010 Sep 15.

Abstract:

Starting from a tripeptide screening hit, a series of dipeptide inhibitors of the proteasome with Thr as the P3 residue has been optimized with the aid of crystal structures in complex with the beta-5/6 active site of y20S. Derivative 25, (beta5 IC(50)=7.4 nM) inhibits only the chymotryptic activity of the proteasome, shows cellular activity against targets in the UPS, and inhibits proliferation.