Abstract
Development of selective or dual proteasome subunit inhibitors based on syringolin B as a scaffold is described. We focused our efforts on a structure–activity relationship study of inhibitors with various substituents at the 3-position of the macrolactam moiety of syringolin B analogue to evaluate whether this would be sufficient to confer subunit selectivity by using sets of analogues with hydrophobic, basic and acidic substituents, which were designed to target Met45, Glu53 and Arg45 embedded in the S1 subsite, respectively. The structure–activity relationship study using systematic analogues provided insight into the origin of the subunit-selective inhibitory activity. This strategy would be sufficient to confer subunit selectivity regarding β5 and β2 subunits.
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