Catechol-based substrates of chalcone synthase as a scaffold for novel inhibitors of PqsD
摘要:
A new strategy for treating Pseudomonas aeruginosa infections could be disrupting the Pseudomonas Quinolone Signal (PQS) quorum sensing (QS) system. The goal is to impair communication among the cells and, hence, reduce the expression of virulence factors and the formation of biofilms. PqsD is an essential enzyme for the synthesis of PQS and shares some features with chalcone synthase (CHS2), an enzyme expressed in Medicago sativa. Both proteins are quite similar concerning the size of the active site, the catalytic residues and the electrostatic surface potential at the entrance of the substrate tunnel. Hence, we evaluated selected substrates of the vegetable enzyme as potential inhibitors of the bacterial protein. This similarity-guided approach led to the identification of a new class of PqsD inhibitors having a catechol structure as an essential feature for activity, a saturated linker with two or more carbons and an ester moiety bearing bulky substituents. The developed compounds showed PqsD inhibition with IC50 values in the single-digit micromolar range. The binding mode of these compounds was investigated by Surface Plasmon Resonance (SPR) experiments revealing that their interaction with the protein is not influenced by the presence of the anthranilic acid bound to active site cysteine. Importantly, some compounds reduced the signal molecule production in cellulo. (C) 2014 Elsevier Masson SAS. All rights reserved.
CATECHOL-BASED DERIVATIVES FOR TREATING OR PREVENTING DIABETICS
申请人:Kuo Yueh-Hsiung
公开号:US20090143397A1
公开(公告)日:2009-06-04
The present invention provides a catechol-based derivative and a pharmaceutical acceptable salt therefrom and a solvate therefrom. A pharmaceutical composition for preventing or treating diabetics and ischemics, comprising a catechol-based derivative of formula (I) and at least one selected from the group consisting of a pharmaceutical excipient, a diluent and a carrier.
Ten esters each of caffeic acid and dihydrocaffeicacid have recently been synthesized. Cytotoxicity evaluations of these esters versus L1210 leukemia and MCF-7 breast cancer cells in culture have led to the delineation of substantially different QSAR for each series. The L1210 QSAR for dihydrocaffeicacidesters resembles the QSAR obtained for simple phenols and estrogenic phenols. However, the QSAR