ATP-conjugated peptide inhibitors for calmodulin-dependent protein kinase II

Abstract

Substrate analog peptides of CaMKII with varying degrees of the inhibitory potency were linked to ATP gamma S either by considering a phosphoryl transfer mechanism or simply by using a relatively long flexible linker. The latter bisubstrate inhibitors showed relatively little effects while the former ones improved inhibitory potency to different levels depending on the binding affinities of the peptide moieties. One of the mechanism-based bisubstrate inhibitors was then utilized to demonstrate an ATP-competitive but peptide substrate-uncompetitive inhibition, supporting an ordered binding mechanism for CaMKII (c) 2006 Elsevier Ltd. All rights reserved.