Phencyclidine-like effects of tetrahydroisoquinolines and related compounds
作者:Nancy M. Gray、Brian K. Cheng、Stephen J. Mick、Cecelia M. Lair、Patricia C. Contreras
DOI:10.1021/jm00126a016
日期:1989.6
3-c]pyridines, and relatedcompounds were evaluated for their ability to inhibit binding of [3H]-1-[1-(2-thienyl)piperidine and [3H]-N-allylnormetazocine to phencyclidine (PCP) and sigma receptors, respectively. A representative series of compounds was evaluated in behavioral assays to determine the ability of the compounds to induce PCP-like stereotyped behavior and ataxia. All of the compounds caused stereotyped
Inhibition of the production of the Pseudomonas aeruginosa virulence factor pyocyanin in wild-type cells by quorum sensing autoinducer-mimics
作者:Bernardas Morkunas、Warren R. J. D. Galloway、Megan Wright、Brett M. Ibbeson、James T. Hodgkinson、Kieron M. G. O'Connell、Noemi Bartolucci、Martina Della Valle、Martin Welch、David R. Spring
DOI:10.1039/c2ob26501j
日期:——
Pseudomonas aeruginosa is a notorious human pathogen associated with a range of life-threatening nosocomial infections. There is an increasing problem of antibiotic resistance in P. aeruginosa, highlighted by the emergence of multi-drug resistant strains. Thus the exploration of new strategies for the treatment of P. aeruginosa infections is clearly warranted. P. aeruginosa is known to produce a range of virulence factors that enhance its ability to damage the host tissue and cause disease. One of the most important virulence factors is pyocyanin. P. aeruginosa regulates pyocyanin production using an intercellular communication mechanism called quorum sensing, which is mediated by small signalling molecules termed autoinducers. One native autoinducer is N-(3-oxododecanoyl)-L-homoserine lactone (OdDHL). Herein we report the synthesis of a collection of abiotic OdDHL-mimics. A number of novel compounds capable of competing with the endogenous OdDHL and consequently, inhibiting the production of pyocyanin in cultures of wild type P. aeruginosa were identified. We present evidence suggesting that compounds of this general structural type act as direct antagonists of quorum sensing in P. aeruginosa and as such may find value as molecular tools for the study and manipulation of this signalling pathway. A direct quantitative comparison of the pyocyanin suppressive activities of the most active OdDHL-mimics with some previously-reported inhibitors (based around different general structural frameworks) of quorum sensing from the literature, was also made.
after just 20 minutes. Other acyldonors (including formyl‐, propionyl‐, and butyryl‐donors) were also efficiently employed in the biocatalytic N‐acylation. Finally, the biocatalyst was tested in transamidation reactions using acetamide as acetyl donor in aqueous medium, reaching yields of 60–70%. This work expands the toolbox of preparative methods for the formation of N‐acyl amides, describing a biocatalytic
Facile direct synthesis of amides from trichloroethyl esters using catalytic DBU
作者:Minh Thanh La、Hee-Kwon Kim
DOI:10.1139/cjc-2018-0234
日期:2018.12
A practical method for the direct synthesis of amide compounds is described. Using small quantities of DBU as a catalyst, the direct conversion of 2,2,2-trichloroethyl esters to their corresponding...
Antagonism of Quorum Sensing Phenotypes by Analogs of the Marine Bacterial Secondary Metabolite 3-Methyl-N-(2′-Phenylethyl)-Butyramide
作者:Susan M. Meschwitz、Margaret E. Teasdale、Ann Mozzer、Nicole Martin、Jiayuan Liu、Stephanie Forschner-Dancause、David C. Rowley
DOI:10.3390/md17070389
日期:——
3-methyl-N-(2'-phenylethyl)-butyramide, produced by a marine bacterium identified as Halobacillus salinus, inhibits QS controlled phenotypes in multiple Gram-negative reporter strains. Here we report that N-phenethyl hexanamide, a structurally-related compound produced by the marine bacterium Vibrio neptunius, similarly demonstrates QS inhibitory properties. To more fully explore structure-activity relationships