Design, synthesis, and optimization of novel epoxide incorporating peptidomimetics as selective calpain inhibitors

Isaac T. Schiefer, Subhasish Tapadar, Vladislav Litosh, Marton Siklos, Rob Scism, Gihani T. Wijewickrama, Esala P. Chandrasena, Vaishali Sinha, Ehsan Tavassoli, Michael Brunsteiner, Mauro Fa', Ottavio Arancio, Pavel Petukhov, Gregory R.J. Thatcher

Research output: Contribution to journalArticlepeer-review

24 Scopus citations

Abstract

Hyperactivation of the calcium-dependent cysteine protease calpain 1 (Cal1) is implicated as a primary or secondary pathological event in a wide range of illnesses and in neurodegenerative states, including Alzheimer's disease (AD). E-64 is an epoxide-containing natural product identified as a potent nonselective, calpain inhibitor, with demonstrated efficacy in animal models of AD. By use of E-64 as a lead, three successive generations of calpain inhibitors were developed using computationally assisted design to increase selectivity for Cal1. First generation analogues were potent inhibitors, effecting covalent modification of recombinant Cal1 catalytic domain (Cal1cat), demonstrated using LC-MS/MS. Refinement yielded second generation inhibitors with improved selectivity. Further library expansion and ligand refinement gave three Cal1 inhibitors, one of which was designed as an activity-based protein profiling probe. These were determined to be irreversible and selective inhibitors by kinetics studies comparing full length Cal1 with the general cysteine protease papain.

Original languageEnglish (US)
Pages (from-to)6054-6068
Number of pages15
JournalJournal of Medicinal Chemistry
Volume56
Issue number15
DOIs
StatePublished - Aug 8 2013
Externally publishedYes

ASJC Scopus subject areas

  • Molecular Medicine
  • Drug Discovery

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