Peptidyl and azapeptidyl methylketones as substrate analog inhibitors of papain and cathepsin B
摘要:
Peptidyl methylketones containing Phe, Tyr, Tyr(I) Tyr(I-2), Leu and Ile in P-2 were synthesized and tested as substrate analog reversible inhibitors of papain and bovine spleen cathepsin B. The most effective cathepsin B inhibitor contained Tyr(I-2) and displayed an inhibition constant of 4.7 mu M at pH 6.8 and 25 degrees C, while Leu or lie gave practically inert analogs. Replacement of the amino acids in P-2 with the analogous alpha-azaamino acids, as well as the glycine in P-1 with alpha-azaglycine, led to complete loss of inhibiting activity. Introducing alkoxy substituents at the methyl adjacent to the ketone group generally resulted in more effective inhibitors, with inhibition constants in the micromolar range for both papain and cathepsin B.
Halogenated cyclic isodityrosine-tripeptides were synthesized as analogues of a marine natural product, eurypamide B. Although the original eurypamides showed no inhibitory activity, the new analogues were found to inhibit lipid droplet accumulation in macrophages with a low micromolar IC50 value. (c) 2005 Elsevier Ltd. All rights reserved.
(EN) Combinatorial chemical libraries of Formula (I) and methods for their preparation are disclosed. The libraries allow one to screen large numbers of compounds for a desired biological activity with relative ease. The libraries may be tagged or untagged. In preferred libraries, Y is the residue of an N-acylated amino acid, a substituted 4-aminoproline or a substituted piperazinealkanoic acid. The use of the libraries to discover biologically active compounds is also disclosed.(FR) L'invention concerne des banques combinatoires de produits chimiques, de formule (I) et leurs procédés de préparation. Lesdites bibliothèques permettent de rechercher relativement facilement une activité biologique voulue dans un grand nombre de composés. Les banques peuvent être marquées ou non marquées. Dans les banques préférées, Y est le reste d'un acide aminé N-acylé, une 4-aminoproline substituée ou un acide pipérazinalcanoïque substitué. L'utilisation de banques pour la découverte de composés biologiquement actifs est également décrite.