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.
New derivatives of alpha-amino-gamma-butyrolactone, method for the preparation thereof and pharmaceutical compositions containing them
申请人:Laboratorio Farmaceutico C.T. s.r.l.
公开号:EP0151964A2
公开(公告)日:1985-08-21
The present invention relates to new derivatives of α-amino-γ-butyrolactone and their pharmaceutically acceptable salts, endowed with anti-convulsant, anti-epileptic, sedative action and able to inhibit the ingestion of alcohol and intoxicating drinks.
The invention relates also to the method for preparing the derivatives of the invention as well as the pharmaceutical compositions containing them.
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.
Sudo, Nippon Kagaku Zasshi, 1958, vol. 79, p. 81,83
作者:Sudo
DOI:——
日期:——
Methods of treating or preventing an infectious disease using an immunogenic conjugate of a gram-negative bacterial autoinducer molecule or antibodies that immunospecifically bind a gram-negative bacterial autoinducer molecule
申请人:Kende S. Andrew
公开号:US20070231839A1
公开(公告)日:2007-10-04
The present invention relates to an immunogenic conjugate comprising a carrier molecule coupled to an autoinducer of a Gram negative bacteria The immunogenic conjugate, when combined with a pharmaceutically acceptable carrier, forms a suitable vaccine for mammals to prevent infection by the Gram negative bacteria The immunogenic conjugate is also used to raise and subsequently isolate antibodies or binding portions thereof which are capable of recognizing and binding to the autoinducer. The antibodies or binding portions thereof are utilized in a method of treating infections, a method of inhibiting autoinducer activity, and in diagnostic assays which detect the presence of autoinducers or autoinducer antagonists in fluid or tissue samples.
TABLE OF CONTENTS
Page
1. FIELD OF THE INVENTION
1
2. BACKGROUND OF THE INVENTION
1
3. SUMMARY OF THE INVENTION
4
4. BRIEF DESCRIPTION OF THE DRAWINGS
7
5. DETAILED DESCRIPTION OF THE INVENTION
7
5.1 Isolation and Synthesis of Homoserine Lactones
7
5.2 Bacterial Autoinducer Conjugation to a Carrier
17
5.3 Generation of Antibodies to BAI Immunogenic conjugates
19
5.4 Therapeutic Uses of Immunogenic conjugates
22
or Antibodies Thereto
5.4.1 Administration and Formulation
22
5.4.2 Effective Dose
25
5.5 Diagnostic Methods
27
6. EXAMPLE: SYNTHESIS
32
Preparation of Compound C
32
Preparation of Compound D
32
Preparation of Compound 5
32
Preparation of Compound 6
33
Preparation of Compound 7
33
Preparation of Compound 8
33
Preparation of Compound 10
34
Preparation of Compound 11
34
Preparation of Compound 13
35
Preparation of Compound 12
35
Preparation of Compound 14
35
Preparation of Compound 15
36
Preparation of Compound 17
36
Preparation of Compound 21
37
Preparation of Compound 22
37
Preparation of Compound 24
38
Preparation of Compound 25
38
Preparation of Compound 27
38
Preparation of Compound 29
39
7. EXAMPLE: PRODUCTION OF BAI ANTIBODIES
39
7.1 PAI'S Role In Virulence
39
7.2 Anti-PAI Polyclonal Antibodies
40
7.3 Neutralization of PAI With Antibodies
40