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Journal Article
Research Support, Non-U.S. Gov't
Development of a new class of proteasome inhibitors with an epoxyketone warhead: Rational hybridization of non-peptidic belactosin derivatives and peptide epoxyketones.
Bioorganic & Medicinal Chemistry 2014 June 16
Proteasome inhibitors are currently a focus of increased attention as anticancer drug candidates. We recently performed systematic structure-activity relationship studies of the peptidic natural product belactosin A and identified non-peptidic derivative 2 as a highly potent proteasome inhibitor. However, the cell growth inhibitory effect of 2 is only moderate, probably due to the biologically unstable β-lactone warhead. Peptide epoxyketones are an important class of proteasome inhibitors exhibit high potency in cellular systems based on the efficient α,β-epoxyketone warhead. Importantly, belactosin derivatives bind primarily to the primed binding site, while peptide epoxyketones bind only to the non-primed binding site of proteasome, suggesting that hybridization of them might lead to the development of a new class of proteasome inhibitors. Thus, we successfully identified a novel chemotype of proteasome inhibitors 3 and 4 by rational structure-based design, which are expected to bind to both the primed and non-primed binding sites of proteasome.
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