Synthesis and biological evaluation of new N-acyl-homoserine-lactone analogues, based on triazole and tetrazole scaffolds, acting as LuxR-dependent quorum sensing modulators
摘要:
New analogues of N-acyl-homoserine-lactone (AHL), in which the amide was replaced by a triazole or tetrazole ring, were prepared and tested for their activity as LuxR-dependent QS modulators. Several compounds showed a level of antagonistic or agonistic activity, notably some 1,4-triazolic and 1,5-tetrazolic derivatives, whereas the 2,5-tetrazolic compounds were inactive. In 1,5-tetrazoles, substituted with butyrolactone and an alkyl chain, the activity was reversed, depending on the connection between the lactone and the tetrazole. The C-N connected compounds were agonists whereas the C-C connected ones were antagonists. (C) 2012 Elsevier Ltd. All rights reserved.
Acyl-homoserine Lactones from Erwinia psidii R. IBSBF 435T, a Guava Phytopathogen (Psidium guajava L.)
摘要:
The phytopathogen Erwinia psidii R. IBSBF 435(T) causes rot in branches, flowers, and fruits of guava (Psidium guajava L.), being responsible for crop losses, and has no effective control. It was demonstrated that this strain produces two compounds [S-(-)-N-hexanoyl and N-heptanoyl-homoserine lactone], both belonging to the class of quorum-sensing signaling substances. A protocol using gas chromatography-flame ionization detection with chiral stationary phase is described for the absolute configuration determination of a natural acyl-homoserine lactone. Biological assays with specific reporter and synthesis of identified substances are also described. This is the first report on the N-heptanoyl-homoserine lactone occurrence in the Erwinia genus.
COMPOUNDS AND METHODS FOR MODULATING COMMUNICATION AND VIRULENCE IN QUORUM SENSING BACTERIA
申请人:BLACKWELL Helen E.
公开号:US20100305182A1
公开(公告)日:2010-12-02
The present invention provides compositions and methods for modulating the communication and virulence of quorum sensing bacteria. In various exemplary embodiments, the invention provides a combinatorial library of quorum sensing compounds including synthetic analogs of naturally occurring and non-naturally occurring acyl-homoserine lactone (AHL) analogs, and methods of synthesizing and using these compounds.
Quorum sensing based polymer for stimulation of biofilms and related phenotypes, and synthesis process thereof
申请人:FIB-SOL Life Technologies Private Limited
公开号:US10988571B2
公开(公告)日:2021-04-27
The invention relates to the synthesis and process thereof of a Quorum Sensing (QS) based polymer formed by the process of ring opening polymerization/ring opening copolymerization. The formed homopolymer or heteropolymer or copolymer displays increased half-life, bioactivity and biostability in stimulating the microbial quorum sensing in a predetermined microbial population.
Absolute Configuration and Antimicrobial Activity of Acylhomoserine Lactones
作者:Armando M. Pomini、Anita J. Marsaioli
DOI:10.1021/np800127b
日期:2008.6.1
(S)-N-Heptanoylhomoserine lactone is an uncommon acyl odd-chain natural product employed by many Gram-negative bacteria as a signaling substance in chemical communication mechanisms known as quorum sensing. The absolute configuration determination of the metabolite produced by the phytopathogen Pantoea ananatis Serrano is reported herein. As with all other substances of this class, the lactone moiety possesses S configuration, corroborating the hypothesis that it shares the same biosynthetic pathway as the (S)-N-hexanoylhomoserine lactone and also that some LuxI homologues can accept both hexanoyl- and heptanoyl-ACP as precursors. Evaluation of the antimicrobial activity of enantiomeric acylhomoserine lactones against three Gram-positive bacteria (Bacillus cereus, B. subtilis, and Staphylococcus aureus) revealed important features between absolute configuration and antimicrobial activity. The N-heptanoylhomoserine lactone was considerably less active than the 3-oxo derivatives. Surprisingly, non-natural (R)-N-(3-oxo-octanoyl)homoserine lactone was as active as the S enantiomer against B. cereus, while the synthetic racemic product was less active than either enantiomer.
Modulation of Bacterial Quorum Sensing with Synthetic Ligands
申请人:Blackwell Helen E.
公开号:US20080312319A1
公开(公告)日:2008-12-18
The present invention provides compounds and methods for modulation of the quorum sensing of bacteria. In an embodiment, the compounds of the present invention are able to act as replacements for naturally occurring bacterial quorum sensing ligands in a ligand-protein binding system; that is, they imitate the effect of natural ligands and produce an agonistic effect. In another embodiment, the compounds of the present invention are able to act in a manner which disturbs or inhibits the naturally occurring ligand-protein binding system in quorum sensing bacteria; that is, they produce an antagonistic effect. The compounds of the present invention comprise N-acylated-homoserine lactones (AHLs) comprised of a wide range of acyl groups.