Discovery and Biophysical Characterization of 2-Amino-oxadiazoles as Novel Antagonists of PqsR, an Important Regulator of Pseudomonas aeruginosa Virulence
摘要:
The human pathogen Pseudomonas aeruginosa employs alkyl quinolones for cell-to-cell communication. The Pseudomonas quinolone signal (PQS) regulates various virulence factors via interaction with the transcriptional regulator PqsR. Therefore, we consider the development of PqsR antagonists a novel strategy to limit the pathogenicity of P. aeruginosa. A fragment identification approach using surface plasmon resonance screening led to the discovery of chemically diverse PqsR ligands. The optimization of the most promising hit (5) resulted in the oxadiazole-2-amine 37 showing pure antagonistic activity in Escherichia coli (EC50 = 7.5 mu M) and P. aeruginosa (EC50 = 38.5 mu M) reporter gene assays. 37 was able to diminish the production of the PQS precursor HHQ in a PqsH-deficient P. aeruginosa mutant The level of the major virulence factor pyocyanin was significantly reduced in wild-type P. aeruginosa. In addition, site-directed mutagenesis in combination with isothermal titration calorimetry and NMR INPHARMA experiments revealed that the identified ligands bind to the same site of PqsR by adopting different binding modes. These findings will be utilized in a future fragment growing approach aiming at novel therapeutic options for the treatment of P. aeruginosa infections.
[EN] N-(1-CYANO-PYRROLIDIN-3-YL)-5-(3-(TRIFLUOROMETHYL)PHENYL)OXAZOLE-2-CARBOXAMIDE DERIVATIVES AND THE CORRESPONDING OXADIAZOLE DERIVATIVES AS USP30 INHIBITORS FOR THE TREATMENT OF MITOCHONDRIAL DYSFUNCTION<br/>[FR] N-(1-CYANO-PYRROLIDIN-3-YL)-5-(3- (TRIFLUOROMÉTHYL)PHÉNYL)OXAZOLE-2-CARBOXAMIDE ET DÉRIVÉS D'OXADIAZOLE CORRESPONDANTS UTILISÉS EN TANT QU'INHIBITEURS D'USP30 POUR LE TRAITEMENT D'UN DYSFONCTIONNEMENT MITOCHONDRIAL
申请人:MISSION THERAPEUTICS LTD
公开号:WO2021239863A1
公开(公告)日:2021-12-02
The present invention relates to a class of N-cyanopyrrolidines with activity as inhibitors of the deubiquitylating enzyme USP30, having utility in a variety of therapeutic areas, including conditions involving mitochondrial dysfunction, cancer and fibrosis: Formula (I), Formula (II)..
Design, Synthesis, and Study of the Insecticidal Activity of Novel Steroidal 1,3,4-Oxadiazoles
作者:Shichuang Ma、Weiqi Jiang、Qi Li、Tian Li、Wenjun Wu、Hangyu Bai、Baojun Shi
DOI:10.1021/acs.jafc.1c00088
日期:2021.10.6
was designed and synthesized, and the target compounds were evaluated for their insecticidalactivity against five aphid species. Most of the tested compounds exhibited potent insecticidalactivity against Eriosoma lanigerum (Hausmann), Myzus persicae, and Aphis citricola. Compounds 20g and 24g displayed the highest activity against E. lanigerum, showing LC50 values of 27.6 and 30.4 μg/mL, respectively
In an effort to discover new agents with good fungicidal activities against CDM (cucumber downy mildew), a series of tetrazolederivativescontaining phenyloxadiazole moieties were designed and synthesized. The EC50 values for fungicidal activities against CDM were determined. Bioassay results indicated that most synthesized compounds exhibited potential in vivo fungicidal activity against CDM. A CoMFA