101
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Pieren M, Tigges M. Adjuvant strategies for potentiation of antibiotics to overcome antimicrobial resistance. Curr Opin Pharmacol 2012; 12:551-5. [PMID: 22835931 DOI: 10.1016/j.coph.2012.07.005] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2012] [Revised: 07/05/2012] [Accepted: 07/06/2012] [Indexed: 12/17/2022]
Abstract
Alarming facts about the occurrence and spreading of multiple antibiotic resistant bacteria have caught the attention of global surveillance authorities and public media. The demand for novel effective antimicrobial drugs is high and on the rise while, at the same time, the supply of fresh 'magic bullets' is drying up. This review summarizes examples of recent strategies for development of adjunctive antibiotic therapies that overcome microbial resistance and thus rejuvenate the existing arsenal of drugs. Recent studies have demonstrated the potential of compounds that inhibit the action of the repressor protein implicated in ethionamide resistance, thus stimulating activation of the drug and thereby restoring the activity of the antibiotic for treatment of Mycobacterium tuberculosis. Such specific interference with regulators or signal transduction mechanisms involved in antibiotic resistance or virulence provides a new toolbox for novel combinations of antimicrobial drugs with adjuvant molecules lacking intrinsic antibiotic activity. In addition to the development of new antibiotics and vaccination initiatives this strategy of restoring or potentiating the activity of existing antibiotics may help to postpone the day when antibiotics are no longer generally efficacious.
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Affiliation(s)
- Michel Pieren
- BioVersys AG, Hochbergerstrasse 60c, c/o Technologycenter, CH-4057 Basel, Switzerland
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102
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Applications of small molecule activators and inhibitors of quorum sensing in Gram-negative bacteria. Trends Microbiol 2012; 20:449-58. [PMID: 22771187 DOI: 10.1016/j.tim.2012.06.003] [Citation(s) in RCA: 136] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2012] [Revised: 06/08/2012] [Accepted: 06/13/2012] [Indexed: 01/23/2023]
Abstract
Quorum sensing is a form of intercellular communication used by many species of bacteria that facilitates concerted interactions between the cells comprising a population. The phenotypes regulated by quorum sensing are extremely diverse, with many having a significant impact upon healthcare, agriculture, and the environment. Consequently there has been significant interest in developing methods to manipulate this signalling process and recent years have witnessed significant theoretical and practical developments. A wide range of small molecule modulators of quorum sensing systems has been discovered, providing an expansive chemical toolbox for the study and modulation of this signalling mechanism. In this review, a selection of recent case studies which illustrate the value of both activators and inhibitors of quorum sensing in Gram-negative bacteria are discussed.
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103
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Brackman G, Risseeuw M, Celen S, Cos P, Maes L, Nelis HJ, Van Calenbergh S, Coenye T. Synthesis and evaluation of the quorum sensing inhibitory effect of substituted triazolyldihydrofuranones. Bioorg Med Chem 2012; 20:4737-43. [PMID: 22748377 DOI: 10.1016/j.bmc.2012.06.009] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2012] [Revised: 05/24/2012] [Accepted: 06/02/2012] [Indexed: 02/07/2023]
Abstract
Acylhomoserine lactone (AHL) analogues in which the amide function is replaced by a triazole group were synthesized and evaluated for their effect on quorum sensing (QS) and biofilm formation in Burkholderia cenocepacia and Pseudomonas aeruginosa. In addition, the influence of the length of the acyl-mimicking chain was investigated. The compounds showed selectivity between two different AHL QS systems. 3-(1H-1,2,3-Triazol-1-yl)dihydrofuran-2(3H)-ones, in which the 4-substituent best resembled the acyl chain of the native AHL molecule exhibited significant QS agonistic and antagonistic activities. Replacing this aliphatic substituent by a phenyl-containing moiety resulted in active inhibitors of QS. The most active compounds showed biofilm inhibitory as well as biofilm eradicating activities in both test organisms.
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Affiliation(s)
- Gilles Brackman
- Laboratory of Pharmaceutical Microbiology, Ghent University, Harelbekestraat 72, B-9000 Ghent, Belgium.
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104
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Wynendaele E, Pauwels E, Van de Wiele C, Burvenich C, De Spiegeleer B. The potential role of quorum-sensing peptides in oncology. Med Hypotheses 2012; 78:814-7. [DOI: 10.1016/j.mehy.2012.03.018] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2011] [Revised: 03/09/2012] [Accepted: 03/22/2012] [Indexed: 10/28/2022]
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105
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Quorum quenching revisited--from signal decays to signalling confusion. SENSORS 2012; 12:4661-96. [PMID: 22666051 PMCID: PMC3355433 DOI: 10.3390/s120404661] [Citation(s) in RCA: 97] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/28/2012] [Revised: 03/23/2012] [Accepted: 03/26/2012] [Indexed: 12/12/2022]
Abstract
In a polymicrobial community, while some bacteria are communicating with neighboring cells (quorum sensing), others are interrupting the communication (quorum quenching), thus creating a constant arms race between intercellular communication. In the past decade, numerous quorum quenching enzymes have been found and initially thought to inactivate the signalling molecules. Though this is widely accepted, the actual roles of these quorum quenching enzymes are now being uncovered. Recent evidence extends the role of quorum quenching to detoxification or metabolism of signalling molecules as food and energy source; this includes “signalling confusion”, a term coined in this paper to refer to the phenomenon of non-destructive modification of signalling molecules. While quorum quenching has been explored as a novel anti-infective therapy targeting, quorum sensing evidence begins to show the development of resistance against quorum quenching.
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106
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Truchado P, Tomás-Barberán FA, Larrosa M, Allende A. Food phytochemicals act as Quorum Sensing inhibitors reducing production and/or degrading autoinducers of Yersinia enterocolitica and Erwinia carotovora. Food Control 2012. [DOI: 10.1016/j.foodcont.2011.09.006] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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107
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Deuterium-labelled N-acyl-L-homoserine lactones (AHLs)--inter-kingdom signalling molecules--synthesis, structural studies, and interactions with model lipid membranes. Anal Bioanal Chem 2012; 403:473-82. [PMID: 22367286 DOI: 10.1007/s00216-012-5839-4] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2011] [Revised: 01/31/2012] [Accepted: 02/03/2012] [Indexed: 10/28/2022]
Abstract
N-Acyl-L-homoserine lactones (AHLs) are synthesized by Gram-negative bacteria. These quorum-sensing molecules play an important role in the context of bacterial infection and biofilm formation. They also allow communication between microorganisms and eukaryotic cells (inter-kingdom signalling). However, very little is known about the entire mechanism of those interactions. Precise structural studies are required to analyse the different AHL isomers as only one form is biologically most active. Theoretical studies combined with experimental infrared and Raman spectroscopic data are therefore undertaken to characterise the obtained compounds. To mimic interactions between AHL and cell membranes, we studied the insertion of AHL in supported lipid bilayers, using vibrational sum-frequency-generation spectroscopy. Deuterium-labelled AHLs were thus synthesized. Starting from readily available deuterated fatty acids, a two-step procedure towards deuterated N-acyl-L-homoserine lactones with varying chain lengths is described. This included the acylation of Meldrum's acid followed by amidation. Additionally, the detailed analytical evaluation of the products is presented herein.
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108
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Liu GY, Guo BQ, Chen WN, Cheng C, Zhang QL, Dai MB, Sun JR, Sun PH, Chen WM. Synthesis, Molecular Docking, and Biofilm Formation Inhibitory Activity of 5-Substituted 3,4-Dihalo-5H-furan-2-one Derivatives on Pseudomonas aeruginosa. Chem Biol Drug Des 2012; 79:628-38. [DOI: 10.1111/j.1747-0285.2012.01342.x] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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109
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Yong YC, Zhong JJ. Impacts of quorum sensing on microbial metabolism and human health. ADVANCES IN BIOCHEMICAL ENGINEERING/BIOTECHNOLOGY 2012; 131:25-61. [PMID: 22767136 DOI: 10.1007/10_2012_138] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
Bacteria were considered to be lonely 'mutes' for hundreds of years. However, recently it was found that bacteria usually coordinate their behaviors at the population level by producing (speaking), sensing (listening), and responding to small signal molecules. This so-called quorum sensing (QS) regulation enables bacteria to live in a 'society' with cell-cell communication and controls many important bacterial behaviors. In this chapter, QS systems and their signal molecules for Gram-negative and Gram-positive bacteria are introduced. Most interestingly, QS regulates the important bacterial behaviors such as metabolism and pathogenesis. QS-regulated microbial metabolism includes antibiotic synthesis, pollutant biodegradation, and bioenergy production, which are very relevant to human health. QS is also well-known for its involvement in bacterial pathogenesis, such as iin nfections by Pseudomonas aeruginosa and Staphylococcus aureus. Novel disease diagnosis strategies and antimicrobial agents have also been developed based on QS regulation on bacterial infections. In addition, to meet the requirements for the detection/quantification of QS signaling molecules for research and application, different biosensors have been constructed, which will also be reviewed here. QS regulation is essential to bacterial survival and important to human health. A better understanding of QS could lead better control/manipulation of bacteria, thus making them more helpful to people.
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Affiliation(s)
- Yang-Chun Yong
- Biofuels Institute, School of the Environment, Jiangsu University, 301 Xuefu Road, 212013, Zhenjiang, Jiangsu Province, China
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110
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Urolithins, ellagitannin metabolites produced by colon microbiota, inhibit Quorum Sensing in Yersinia enterocolitica: Phenotypic response and associated molecular changes. Food Chem 2011; 132:1465-1474. [PMID: 29243637 DOI: 10.1016/j.foodchem.2011.12.003] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2011] [Revised: 11/30/2011] [Accepted: 12/02/2011] [Indexed: 01/01/2023]
Abstract
The mammalian enteropathogen Yersinia enterocolitica produces two main N-acylhomoserine lactones (AHLs) involved in Quorum Sensing (QS)-mediated infection processes, such as virulence, biofilm maturation and motility. Ellagitannin (ET)-rich fruits exhibit anti-QS activity but in vivo effects against intestinal pathogens may be associated to the ETs gut microbiota derived metabolites, urolithin-A (Uro-A) and urolithin-B (Uro-B). In this work we show that urolithins, at concentrations achievable in the intestine through the diet, reduce the levels of N-hexanoyl-l-homoserine lactone (C6-HSL) and N-(3-oxo-hexanoyl)-l-homoserine lactone (3-oxo-C6-HSL) in Y. enterocolitica and inhibit QS-associated biofilm maturation and swimming motility. These inhibitory effects were not associated to downregulation of the expression of some of the genes involved in the synthesis of AHLs (yenI and yenR) or in motility (flhDC, fliA, fleB). Our results suggest that urolithins may exert antipathogenic effects in the gut against Y. enterocolitica and highlight the need to investigate the antipathogenic in vivo properties of plant derived metabolites.
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111
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Boukraa M, Sabbah M, Soulère L, El Efrit ML, Queneau Y, Doutheau A. AHL-dependent quorum sensing inhibition: Synthesis and biological evaluation of α-(N-alkyl-carboxamide)-γ-butyrolactones and α-(N-alkyl-sulfonamide)-γ-butyrolactones. Bioorg Med Chem Lett 2011; 21:6876-9. [DOI: 10.1016/j.bmcl.2011.09.010] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2011] [Revised: 09/01/2011] [Accepted: 09/02/2011] [Indexed: 10/17/2022]
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112
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Bridier A, Briandet R, Thomas V, Dubois-Brissonnet F. Resistance of bacterial biofilms to disinfectants: a review. BIOFOULING 2011; 27:1017-32. [PMID: 22011093 DOI: 10.1080/08927014.2011.626899] [Citation(s) in RCA: 535] [Impact Index Per Article: 41.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
A biofilm can be defined as a community of microorganisms adhering to a surface and surrounded by a complex matrix of extrapolymeric substances. It is now generally accepted that the biofilm growth mode induces microbial resistance to disinfection that can lead to substantial economic and health concerns. Although the precise origin of such resistance remains unclear, different studies have shown that it is a multifactorial process involving the spatial organization of the biofilm. This review will discuss the mechanisms identified as playing a role in biofilm resistance to disinfectants, as well as novel anti-biofilm strategies that have recently been explored.
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Affiliation(s)
- A Bridier
- AgroParisTech, UMR MICALIS, F-91300 Massy, France
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113
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Malladi VLA, Sobczak AJ, Meyer TM, Pei D, Wnuk SF. Inhibition of LuxS by S-ribosylhomocysteine analogues containing a [4-aza]ribose ring. Bioorg Med Chem 2011; 19:5507-19. [PMID: 21855358 PMCID: PMC3171632 DOI: 10.1016/j.bmc.2011.07.043] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2011] [Revised: 07/12/2011] [Accepted: 07/22/2011] [Indexed: 01/19/2023]
Abstract
LuxS (S-ribosylhomocysteinase) catalyzes the cleavage of the thioether linkage of S-ribosylhomocysteine (SRH) to produce homocysteine and 4,5-dihydroxy-2,3-pentanedione (DPD), the precursor to a small signaling molecule that mediates interspecies bacterial communication called autoinducer 2 (AI-2). Inhibitors of LuxS should interfere with bacterial interspecies communication and potentially provide a novel class of antibacterial agents. In this work, SRH analogues containing substitution of a nitrogen atom for the endocyclic oxygen as well as various deoxyriboses were synthesized and evaluated for LuxS inhibition. Two of the [4-aza]SRH analogues showed modest competitive inhibition (K(I) ∼40 μM), while most of the others were inactive. One compound that contains a hemiaminal moiety exhibited time-dependent inhibition, consistent with enzyme-catalyzed ring opening and conversion into a more potent species (K(I)(∗)=3.5 μM). The structure-activity relationship of the designed inhibitors highlights the importance of both the homocysteine and ribose moieties for high-affinity binding to LuxS active site.
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Affiliation(s)
- Venkata L. A. Malladi
- Department of Chemistry & Biochemistry, Florida International University, Miami, FL 33199, USA
| | - Adam J. Sobczak
- Department of Chemistry & Biochemistry, Florida International University, Miami, FL 33199, USA
- On a faculty leave from University of Life Sciences, Department of Chemistry, Poznan, Poland
| | - Tiffany M. Meyer
- Department of Chemistry and Ohio State Biochemistry program, The Ohio State University, 100 West 18 Avenue, Columbus, Ohio 43210, USA
| | - Dehua Pei
- Department of Chemistry and Ohio State Biochemistry program, The Ohio State University, 100 West 18 Avenue, Columbus, Ohio 43210, USA
| | - Stanislaw F. Wnuk
- Department of Chemistry & Biochemistry, Florida International University, Miami, FL 33199, USA
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114
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New inhibitors of colony spreading in Bacillus subtilis and Bacillus anthracis. Bioorg Med Chem Lett 2011; 21:5583-8. [PMID: 21784632 DOI: 10.1016/j.bmcl.2011.06.082] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2011] [Revised: 06/15/2011] [Accepted: 06/17/2011] [Indexed: 11/21/2022]
Abstract
We have recently characterized sliding motility in Bacillus subtilis strains that lack functional flagella, and here describe the discovery of inhibitors of colony spreading in these strains as well as the aflagellate pathogen, Bacillus anthracis. Aflagellate B. subtilis strains were used to screen for new types of antibacterials that might inhibit colony spreading on semi-solid media. From a diverse set of organic structures, p-nitrophenylglycerol (NPG), an agent used primarily in clinical laboratories to control Proteus swarming, was found to inhibit colony spreading. The four stereoisomers of NPG were synthesized and tested, and only the 1R,2S-(1R-anti) and 1R,2R-(1R-syn) NPG isomers had significant activity in a quantitative colony-spreading assay. Twenty-six NPG analogs and related structures were synthesized and tested to identify more active inhibitors. p-Methylsulfonylphenylglycerol (p-SPG), but not its ortho or meta analogs, was found to be the most effective of these compounds, and synthesis and testing of all four p-SPG stereoisomers showed that the 1R-anti-isomer was the most active with an average IC(50) of 16 μM (3-5 μg mL(-1)). For B. anthracis, the colony-spreading IC(50) values for 1R-anti-SPG and 1R-anti-NPG are 12 μM (2-4 μg mL(-1)) and >150 μM, respectively. For both Bacillus species tested, 1R-anti-SPG inhibits colony spreading of surface cultures on agar plates, but is not bacteriostatic or bacteriocidal in liquid cultures. Work is in progress to find the cellular target(s) of the NPG/SPG class of compounds, since this could lead to an understanding of the mechanism(s) of colony spreading as well as design and development of more potent inhibitors for the control of B. anthracis surface cultures.
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115
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Malladi VLA, Sobczak AJ, Maricic N, Murugapiran SK, Schneper L, Makemson J, Mathee K, Wnuk SF. Substituted lactam and cyclic azahemiacetals modulate Pseudomonas aeruginosa quorum sensing. Bioorg Med Chem 2011; 19:5500-6. [PMID: 21855349 PMCID: PMC3171587 DOI: 10.1016/j.bmc.2011.07.044] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2011] [Revised: 07/12/2011] [Accepted: 07/22/2011] [Indexed: 11/23/2022]
Abstract
Quorum sensing (QS) is a population-dependent signaling process bacteria use to control multiple processes including virulence that is critical for establishing infection. The most common QS signaling molecule used by Gram-negative bacteria are acylhomoserine lactones. The development of non-native acylhomoserine lactone (AHL) ligands has emerged as a promising new strategy to inhibit QS in Gram-negative bacteria. In this work, we have synthesized a set of optically pure γ-lactams and their reduced cyclic azahemiacetal analogues, bearing the additional alkylthiomethyl substituent, and evaluated their effect on the AHL-dependent Pseudomonas aeruginosa las and rhl QS pathways. The concentration of these ligands and the simple structural modification such as the length of the alkylthio substituent has notable effect on activity. The γ-lactam derivatives with nonylthio or dodecylthio chains acted as inhibitors of las signaling with moderate potency. The cyclic azahemiacetal with shorter propylthio or hexylthio substituent was found to strongly inhibit both las and rhl signaling at higher concentrations while the propylthio analogue strongly stimulated the las QS system at lower concentrations.
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Affiliation(s)
- Venkata L. A. Malladi
- Department of Chemistry & Biochemistry, Florida International University, Miami, FL 33199, USA
| | - Adam J. Sobczak
- Department of Chemistry & Biochemistry, Florida International University, Miami, FL 33199, USA
| | - Natalie Maricic
- Department of Molecular Microbiology and Infectious Diseases, Florida International University, Miami, FL 33199, USA
| | - Senthil Kumar Murugapiran
- Department of Molecular Microbiology and Infectious Diseases, Florida International University, Miami, FL 33199, USA
| | - Lisa Schneper
- Department of Molecular Microbiology and Infectious Diseases, Florida International University, Miami, FL 33199, USA
| | - John Makemson
- Department of Biological Sciences, Florida International University, Miami, FL 33199, USA
| | - Kalai Mathee
- Department of Molecular Microbiology and Infectious Diseases, Florida International University, Miami, FL 33199, USA
| | - Stanislaw F. Wnuk
- Department of Chemistry & Biochemistry, Florida International University, Miami, FL 33199, USA
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116
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Dobretsov S, Teplitski M, Bayer M, Gunasekera S, Proksch P, Paul VJ. Inhibition of marine biofouling by bacterial quorum sensing inhibitors. BIOFOULING 2011; 27:893-905. [PMID: 21882898 PMCID: PMC3489184 DOI: 10.1080/08927014.2011.609616] [Citation(s) in RCA: 95] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
Seventy eight natural products from chemical libraries containing compounds from marine organisms (sponges, algae, fungi, tunicates and cyanobacteria) and terrestrial plants, were screened for the inhibition of bacterial quorum sensing (QS) using a reporter strain Chromobacterium violaceum CV017. About half of the natural products did not show any QS inhibition. Twenty four percent of the tested compounds inhibited QS of the reporter without causing toxicity. The QS inhibitory activities of the most potent and abundant compounds were further investigated using the LuxR-based reporter E. coli pSB401 and the LasR-based reporter E. coli pSB1075. Midpacamide and tenuazonic acid were toxic to the tested reporters. QS-dependent luminescence of the LasR-based reporter, which is normally induced by N-3-oxo-dodecanoyl-L-homoserine lactone, was reduced by demethoxy encecalin and hymenialdisin at concentrations >6.6 μM and 15 μM, respectively. Hymenialdisin, demethoxy encecalin, microcolins A and B and kojic acid inhibited responses of the LuxR-based reporter induced by N-3-oxo-hexanoyl-L-homoserine lactone at concentrations >0.2 μM, 2.2 μM, 1.5 μM, 15 μM and 36 μM, respectively. The ability to prevent microfouling by one of the compounds screened in this study (kojic acid; final concentrations 330 μM and 1 mM) was tested in a controlled mesocosm experiment. Kojic acid inhibited formation of microbial communities on glass slides, decreasing the densities of bacteria and diatoms in comparison with the control lacking kojic acid. The study suggests that natural products with QS inhibitory properties can be used for controlling biofouling communities.
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Affiliation(s)
- Sergey Dobretsov
- Department of Marine Science and Fisheries, College of Agricultural and Marine Sciences, Sultan Qaboos University, Sultanate of Oman.
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117
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Singh SP, Michaelides A, Merrill AR, Schwan AL. A Microwave-Assisted Synthesis of (S)-N-Protected Homoserine γ-Lactones from l-Aspartic Acid. J Org Chem 2011; 76:6825-31. [DOI: 10.1021/jo2008093] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Suneel P. Singh
- Department of Chemistry and ‡Department of Molecular and Cellular Biology, University of Guelph, Guelph, Ontario, Canada N1G 2W1
| | - Alex Michaelides
- Department of Chemistry and ‡Department of Molecular and Cellular Biology, University of Guelph, Guelph, Ontario, Canada N1G 2W1
| | - A. Rod Merrill
- Department of Chemistry and ‡Department of Molecular and Cellular Biology, University of Guelph, Guelph, Ontario, Canada N1G 2W1
| | - Adrian L. Schwan
- Department of Chemistry and ‡Department of Molecular and Cellular Biology, University of Guelph, Guelph, Ontario, Canada N1G 2W1
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118
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Sabbah M, Soulère L, Reverchon S, Queneau Y, Doutheau A. LuxR dependent quorum sensing inhibition by N,N'-disubstituted imidazolium salts. Bioorg Med Chem 2011; 19:4868-75. [PMID: 21782453 DOI: 10.1016/j.bmc.2011.06.075] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2011] [Revised: 06/24/2011] [Accepted: 06/26/2011] [Indexed: 11/28/2022]
Abstract
Thirty N,N'-disubstituted imidazolium salts have been synthesized and evaluated as LuxR antagonists. Substitution on one of the imidazolium nitrogen atoms includes benzhydryl, fluorenyl or cyclopentyl substituent, and alkyl chains of various lengths on the second one. Most of these compounds displayed antagonist activity, with IC(50) reaching the micromolar range for the most active ones. The disubstituted imidazolium scaffold is thus shown to be a new pertinent pharmacophore in the field of AHL dependent QS inhibition.
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Affiliation(s)
- Mohamad Sabbah
- INSA Lyon, Institut de Chimie et Biochimie Moléculaires et Supramoléculaires, Laboratoire de Chimie Organique et Bioorganique, Bât J. Verne, 20 av A. Einstein, 69621 Villeurbanne Cedex, France
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119
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A strategy for antagonizing quorum sensing. Mol Cell 2011; 42:199-209. [PMID: 21504831 DOI: 10.1016/j.molcel.2011.04.003] [Citation(s) in RCA: 199] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2010] [Revised: 01/08/2011] [Accepted: 02/22/2011] [Indexed: 10/18/2022]
Abstract
Quorum-sensing bacteria communicate via small molecules called autoinducers to coordinate collective behaviors. Because quorum sensing controls virulence factor expression in many clinically relevant pathogens, membrane-permeable quorum sensing antagonists that prevent population-wide expression of virulence genes offer a potential route to novel antibacterial therapeutics. Here, we report a strategy for inhibiting quorum-sensing receptors of the widespread LuxR family. Structure-function studies with natural and synthetic ligands demonstrate that the dimeric LuxR-type transcription factor CviR from Chromobacterium violaceum is potently antagonized by molecules that bind in place of the native acylated homoserine lactone autoinducer, provided that they stabilize a closed conformation. In such conformations, each of the two DNA-binding domains interacts with the ligand-binding domain of the opposing monomer. Consequently, the DNA-binding helices are held apart by ∼60 Å, twice the ∼30 Å separation required for operator binding. This approach may represent a general strategy for the inhibition of multidomain proteins.
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120
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Natrah FMI, Defoirdt T, Sorgeloos P, Bossier P. Disruption of bacterial cell-to-cell communication by marine organisms and its relevance to aquaculture. MARINE BIOTECHNOLOGY (NEW YORK, N.Y.) 2011; 13:109-126. [PMID: 21246235 DOI: 10.1007/s10126-010-9346-3] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/03/2010] [Accepted: 12/15/2010] [Indexed: 05/30/2023]
Abstract
Bacterial disease is one of the most critical problems in commercial aquaculture. Although various methods and treatments have been developed to curb the problem, yet they still have significant drawbacks. A novel and environmental-friendly approach in solving this problem is through the disruption of bacterial communication or quorum sensing (QS). In this communication scheme, bacteria regulate their own gene expression by producing, releasing, and sensing chemical signals from the environment. There seems to be a link between QS and diseases through the regulation of certain phenotypes and the induction of virulence factors responsible for pathogen-host association. Several findings have reported that numerous aquatic organisms such as micro-algae, macro-algae, invertebrates, or even other bacteria have the potential to disrupt QS. The mechanism of action varies from degradation of signals through enzymatic or chemical inactivation to antagonistic as well as agonistic activities. This review focuses on the existing marine organisms that are able to interfere with QS with potential application for aquaculture as bacterial control.
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Affiliation(s)
- F M I Natrah
- Laboratory of Aquaculture and Artemia Reference Center, Ghent University, Rozier 44, 9000, Ghent, Belgium.
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121
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Zakhari JS, Kinoyama I, Struss AK, Pullanikat P, Lowery CA, Lardy M, Janda KD. Synthesis and molecular modeling provide insight into a Pseudomonas aeruginosa quorum sensing conundrum. J Am Chem Soc 2011; 133:3840-2. [PMID: 21348514 PMCID: PMC3060279 DOI: 10.1021/ja111138y] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The triphenyl amide/ester 12 was originally reported to be a potent mimic of the natural 3-oxo-dodecanoyl homoserine lactone quorum sensing molecule in Pseudomonas aeruginosa. However, explicit synthesis/chemical characterization was lacking, and a later report providing protein crystallographic data inferred 12 to be incorrect, with 9 now being the surmised structure. Because of these inconsistencies and our interest in quorum sensing molecules utilized by gram-negative bacteria, we found it necessary to synthesize 9 and 12 to test for agonistic activity in a P. aeruginosa reporter assay. Despite distinct regiochemical differences, both 9 and 12 were found to have comparable EC(50) values. To reconcile these unanticipated findings, modeling studies were conducted, and both compounds were revealed to have comparable properties for binding to the LasR receptor.
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Affiliation(s)
- Joseph S. Zakhari
- The Skaggs Institute for Chemical Biology and Departments of Chemistry and Immunology and the Worm Institute for Research and Medicine (WIRM), The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037
| | - Isao Kinoyama
- The Skaggs Institute for Chemical Biology and Departments of Chemistry and Immunology and the Worm Institute for Research and Medicine (WIRM), The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037
| | - Anjali K. Struss
- The Skaggs Institute for Chemical Biology and Departments of Chemistry and Immunology and the Worm Institute for Research and Medicine (WIRM), The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037
| | - Prasanna Pullanikat
- The Skaggs Institute for Chemical Biology and Departments of Chemistry and Immunology and the Worm Institute for Research and Medicine (WIRM), The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037
| | - Colin A. Lowery
- The Skaggs Institute for Chemical Biology and Departments of Chemistry and Immunology and the Worm Institute for Research and Medicine (WIRM), The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037
| | - Matthew Lardy
- The Skaggs Institute for Chemical Biology and Departments of Chemistry and Immunology and the Worm Institute for Research and Medicine (WIRM), The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037
| | - Kim D. Janda
- The Skaggs Institute for Chemical Biology and Departments of Chemistry and Immunology and the Worm Institute for Research and Medicine (WIRM), The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037
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Reyes S, Huigens RW, Su Z, Simon ML, Melander C. Synthesis and biological activity of 2-aminoimidazole triazoles accessed by Suzuki-Miyaura cross-coupling. Org Biomol Chem 2011; 9:3041-9. [PMID: 21394327 DOI: 10.1039/c0ob00925c] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A pilot library of 2-aminoimidazole triazoles (2-AITs) was synthesized and assayed against Acinetobacter baumannii and methicillin-resistant Staphylococus aureus (MRSA). Results from these studies show that these new derivatives have improved biofilm dispersal activities as well as antibacterial properties against A. baumannii. With MRSA biofilms they are found to possess biofilm inhibition capabilities at low micromolar concentrations.
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Affiliation(s)
- Samuel Reyes
- North Carolina State University, Department of Chemistry, Raleigh, North Carolina 27695-8204, USA
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123
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Mattmann ME, Shipway PM, Heth NJ, Blackwell HE. Potent and selective synthetic modulators of a quorum sensing repressor in Pseudomonas aeruginosa identified from second-generation libraries of N-acylated L-homoserine lactones. Chembiochem 2011; 12:942-9. [PMID: 21365734 DOI: 10.1002/cbic.201000708] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2010] [Indexed: 11/08/2022]
Abstract
Bacteria can coordinate group behavior using chemical signals in a process called quorum sensing (QS). The QS system in the opportunistic pathogen Pseudomonas aeruginosa is largely governed by the LasR receptor and its cognate chemical signal, N-(3-oxo)-dodecanoyl L-homoserine lactone (OdDHL). LasR also appears to share this signal with an orphan LuxR-type receptor in P. aeruginosa, termed QscR, which represses LasR activity. Non-native molecules that modulate QscR would represent valuable tools to study the role of this novel QS repressor protein in P. aeruginosa. We performed a critical analysis of previously identified, non-native N-acylated L-homoserine lactone (AHL) activators and inhibitors of QscR to determine a set of structure-activity relationships (SARs). Based on these SAR data, we designed, synthesized, and screened several second-generation libraries of AHLs for new ligands that could target QscR. These studies revealed the most active AHL agonists and antagonists of QscR reported to date, with activities ranging from nanomolar to low micromolar in a QscR bacterial reporter strain. Several of these AHLs were highly selective for QscR over LasR and other LuxR-type receptors. A small subset of the new QscR activators, however, were also found to inhibit LasR; this demonstrates the exciting potential for the synergistic modulation of these integral P. aeruginosa QS receptors by using a single synthetic compound.
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Affiliation(s)
- Margrith E Mattmann
- Department of Chemistry, University of Wisconsin-Madison, Madison, WI 53706-1322, USA
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124
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Kenwright JL, Galloway WRJD, Blackwell DT, Isidro-Llobet A, Hodgkinson J, Wortmann L, Bowden SD, Welch M, Spring DR. Novel and Efficient Copper-Catalysed Synthesis of Nitrogen-Linked Medium-Ring Biaryls. Chemistry 2011; 17:2981-6. [DOI: 10.1002/chem.201002093] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2010] [Revised: 10/21/2010] [Indexed: 11/10/2022]
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125
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Hu S, Zheng H, Gu Y, Zhao J, Zhang W, Yang Y, Wang S, Zhao G, Yang S, Jiang W. Comparative genomic and transcriptomic analysis revealed genetic characteristics related to solvent formation and xylose utilization in Clostridium acetobutylicum EA 2018. BMC Genomics 2011; 12:93. [PMID: 21284892 PMCID: PMC3044671 DOI: 10.1186/1471-2164-12-93] [Citation(s) in RCA: 69] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2010] [Accepted: 02/02/2011] [Indexed: 12/17/2022] Open
Abstract
Background Clostridium acetobutylicum, a gram-positive and spore-forming anaerobe, is a major strain for the fermentative production of acetone, butanol and ethanol. But a previously isolated hyper-butanol producing strain C. acetobutylicum EA 2018 does not produce spores and has greater capability of solvent production, especially for butanol, than the type strain C. acetobutylicum ATCC 824. Results Complete genome of C. acetobutylicum EA 2018 was sequenced using Roche 454 pyrosequencing. Genomic comparison with ATCC 824 identified many variations which may contribute to the hyper-butanol producing characteristics in the EA 2018 strain, including a total of 46 deletion sites and 26 insertion sites. In addition, transcriptomic profiling of gene expression in EA 2018 relative to that of ATCC824 revealed expression-level changes of several key genes related to solvent formation. For example, spo0A and adhEII have higher expression level, and most of the acid formation related genes have lower expression level in EA 2018. Interestingly, the results also showed that the variation in CEA_G2622 (CAC2613 in ATCC 824), a putative transcriptional regulator involved in xylose utilization, might accelerate utilization of substrate xylose. Conclusions Comparative analysis of C. acetobutylicum hyper-butanol producing strain EA 2018 and type strain ATCC 824 at both genomic and transcriptomic levels, for the first time, provides molecular-level understanding of non-sporulation, higher solvent production and enhanced xylose utilization in the mutant EA 2018. The information could be valuable for further genetic modification of C. acetobutylicum for more effective butanol production.
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Affiliation(s)
- Shiyuan Hu
- Key Laboratory of Synthetic Biology, Institute of Plant Physiology and Ecology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 200032, China
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126
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Hodgkinson JT, Galloway WRJD, Saraf S, Baxendale IR, Ley SV, Ladlow M, Welch M, Spring DR. Microwave and flow syntheses of Pseudomonasquinolone signal (PQS) and analogues. Org Biomol Chem 2011; 9:57-61. [DOI: 10.1039/c0ob00652a] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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127
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Rezaei A, Oyong GG, Borja VB, Inoue M, Abe T, Tamamura R, Nagatsuka H, Setsu K, Buery RR. Molecular Screening of Anti-quorum Sensing Capability of Salvadora Persica on Enterococcus Faecalis. J HARD TISSUE BIOL 2011. [DOI: 10.2485/jhtb.20.115] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
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128
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Galloway WRJD, Hodgkinson JT, Bowden SD, Welch M, Spring DR. Quorum Sensing in Gram-Negative Bacteria: Small-Molecule Modulation of AHL and AI-2 Quorum Sensing Pathways. Chem Rev 2010; 111:28-67. [DOI: 10.1021/cr100109t] [Citation(s) in RCA: 454] [Impact Index Per Article: 32.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Warren R. J. D. Galloway
- Department of Chemistry and Department of Biochemistry, University of Cambridge, Cambridge, CB2 1EW U.K
| | - James T. Hodgkinson
- Department of Chemistry and Department of Biochemistry, University of Cambridge, Cambridge, CB2 1EW U.K
| | - Steven D. Bowden
- Department of Chemistry and Department of Biochemistry, University of Cambridge, Cambridge, CB2 1EW U.K
| | - Martin Welch
- Department of Chemistry and Department of Biochemistry, University of Cambridge, Cambridge, CB2 1EW U.K
| | - David R. Spring
- Department of Chemistry and Department of Biochemistry, University of Cambridge, Cambridge, CB2 1EW U.K
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129
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Natural and synthetic small boron-containing molecules as potential inhibitors of bacterial and fungal quorum sensing. Chem Rev 2010; 111:209-37. [PMID: 21171664 DOI: 10.1021/cr100093b] [Citation(s) in RCA: 142] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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130
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Stevens AM, Queneau Y, Soulère L, Bodman SV, Doutheau A. Mechanisms and Synthetic Modulators of AHL-Dependent Gene Regulation. Chem Rev 2010; 111:4-27. [DOI: 10.1021/cr100064s] [Citation(s) in RCA: 70] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Ann M. Stevens
- Department of Biological Sciences, Virginia Tech, Blacksburg, Virginia 24061, United States, INSA Lyon, Laboratoire de Chimie Organique et Bioorganique, 69621 Villeurbanne Cedex, France, CNRS, UMR 5246 ICBMS, Université Lyon 1, INSA-Lyon, CPE-Lyon, 69622 Villeurbanne Cedex, France, Department of Plant Science, University of Connecticut, Storrs, Connecticut 06269, United States, and National Science Foundation, Arlington, Virginia 22230, United States
| | - Yves Queneau
- Department of Biological Sciences, Virginia Tech, Blacksburg, Virginia 24061, United States, INSA Lyon, Laboratoire de Chimie Organique et Bioorganique, 69621 Villeurbanne Cedex, France, CNRS, UMR 5246 ICBMS, Université Lyon 1, INSA-Lyon, CPE-Lyon, 69622 Villeurbanne Cedex, France, Department of Plant Science, University of Connecticut, Storrs, Connecticut 06269, United States, and National Science Foundation, Arlington, Virginia 22230, United States
| | - Laurent Soulère
- Department of Biological Sciences, Virginia Tech, Blacksburg, Virginia 24061, United States, INSA Lyon, Laboratoire de Chimie Organique et Bioorganique, 69621 Villeurbanne Cedex, France, CNRS, UMR 5246 ICBMS, Université Lyon 1, INSA-Lyon, CPE-Lyon, 69622 Villeurbanne Cedex, France, Department of Plant Science, University of Connecticut, Storrs, Connecticut 06269, United States, and National Science Foundation, Arlington, Virginia 22230, United States
| | - Susanne von Bodman
- Department of Biological Sciences, Virginia Tech, Blacksburg, Virginia 24061, United States, INSA Lyon, Laboratoire de Chimie Organique et Bioorganique, 69621 Villeurbanne Cedex, France, CNRS, UMR 5246 ICBMS, Université Lyon 1, INSA-Lyon, CPE-Lyon, 69622 Villeurbanne Cedex, France, Department of Plant Science, University of Connecticut, Storrs, Connecticut 06269, United States, and National Science Foundation, Arlington, Virginia 22230, United States
| | - Alain Doutheau
- Department of Biological Sciences, Virginia Tech, Blacksburg, Virginia 24061, United States, INSA Lyon, Laboratoire de Chimie Organique et Bioorganique, 69621 Villeurbanne Cedex, France, CNRS, UMR 5246 ICBMS, Université Lyon 1, INSA-Lyon, CPE-Lyon, 69622 Villeurbanne Cedex, France, Department of Plant Science, University of Connecticut, Storrs, Connecticut 06269, United States, and National Science Foundation, Arlington, Virginia 22230, United States
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131
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Mattmann ME, Blackwell HE. Small molecules that modulate quorum sensing and control virulence in Pseudomonas aeruginosa. J Org Chem 2010; 75:6737-46. [PMID: 20672805 PMCID: PMC2952040 DOI: 10.1021/jo101237e] [Citation(s) in RCA: 89] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Bacteria use small molecule signals to access their local population densities in a process called quorum sensing (QS). Once a threshold signal concentration is reached, and therefore a certain number of bacteria have assembled, bacteria use QS to change gene expression levels and initiate behaviors that benefit the group. These group processes play central roles in both bacterial virulence and symbiosis and can have significant impacts on human health, agriculture, and the environment. The dependence of QS on small molecule signals has inspired organic chemists to design non-native molecules that can intercept these signals and thereby perturb bacterial group behaviors. The opportunistic pathogen Pseudomonas aeruginosa has been the target of many of these efforts due to its prevalence in human infections. P. aeruginosa uses at least two N-acyl l-homoserine lactone signals and three homologous LuxR-type receptors to initiate a range of pathogenic behaviors at high cell densities, including biofilm formation and the production of an arsenal of virulence factors. This perspective highlights recent chemical efforts to modulate LuxR-type receptor activity in P. aeruginosa and offers insight into the development of receptor-specific ligands as potential antivirulence strategies.
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Affiliation(s)
- Margrith E. Mattmann
- Department of Chemistry, University of Wisconsin–Madison, 1101 University Avenue, Madison, WI 53706-1322
| | - Helen E. Blackwell
- Department of Chemistry, University of Wisconsin–Madison, 1101 University Avenue, Madison, WI 53706-1322
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132
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Identification of synthetic inducers and inhibitors of the quorum-sensing regulator LasR in Pseudomonas aeruginosa by high-throughput screening. Appl Environ Microbiol 2010; 76:8255-8. [PMID: 20935125 DOI: 10.1128/aem.00499-10] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
We report the screening of 16,000 synthetic compounds for induction and inhibition of quorum sensing in a Pseudomonas putida N-acylated l-homoserine lactone (AHL) sensor strain engineered with the LasR transcriptional activator. LasR controls virulence gene expression in the opportunistic pathogen Pseudomonas aeruginosa and is of significant interest as a therapeutic target. Nine compounds that inhibit and 14 compounds that induce LasR activity were identified in our high-throughput screen.
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133
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Dai C, Cheng Y, Cui J, Wang B. Click reactions and boronic acids: applications, issues, and potential solutions. Molecules 2010; 15:5768-81. [PMID: 20733546 PMCID: PMC6257766 DOI: 10.3390/molecules15085768] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2010] [Revised: 07/27/2010] [Accepted: 08/04/2010] [Indexed: 01/10/2023] Open
Abstract
Boronic acids have been widely used in a wide range of organic reactions, in the preparation of sensors for carbohydrates, and as potential pharmaceutical agents. With the growing importance of click reactions, inevitably they are also applied to the synthesis of compounds containing the boronic acid moiety. However, such applications have unique problems. Chief among them is the issue of copper-mediated boronic acid degradation in copper-assisted [2,3]-cycloadditions involving an alkyne and an azido compound as the starting materials. This review summarizes recent developments, analyzes potential issues, and discusses known as well as possible solutions.
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Affiliation(s)
| | | | | | - Binghe Wang
- Department of Chemistry and Center for Biotechnology and Drug Design, Georgia State University, Atlanta, Georgia, 30303, USA
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134
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Plakunov VK, Strelkova EA, Zhurina MV. Persistence and adaptive mutagenesis in biofilms. Microbiology (Reading) 2010. [DOI: 10.1134/s0026261710040028] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
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135
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136
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Soulère L, Sabbah M, Fontaine F, Queneau Y, Doutheau A. LuxR-dependent quorum sensing: Computer aided discovery of new inhibitors structurally unrelated to N-acylhomoserine lactones. Bioorg Med Chem Lett 2010; 20:4355-8. [DOI: 10.1016/j.bmcl.2010.06.081] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2010] [Revised: 06/11/2010] [Accepted: 06/12/2010] [Indexed: 10/19/2022]
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137
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Lynch AS, Abbanat D. New antibiotic agents and approaches to treat biofilm-associated infections. Expert Opin Ther Pat 2010; 20:1373-87. [DOI: 10.1517/13543776.2010.505923] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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138
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Paradigm shift in discovering next-generation anti-infective agents: targeting quorum sensing, c-di-GMP signaling and biofilm formation in bacteria with small molecules. Future Med Chem 2010; 2:1005-35. [DOI: 10.4155/fmc.10.185] [Citation(s) in RCA: 112] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
Small molecules that can attenuate bacterial toxin production or biofilm formation have the potential to solve the bacteria resistance problem. Although several molecules, which inhibit bacterial cell-to-cell communication (quorum sensing), biofilm formation and toxin production, have been discovered, there is a paucity of US FDA-approved drugs that target these processes. Here, we review the current understanding of quorum sensing in important pathogens such as Pseudomonas aeruginosa, Escherichia coli and Staphylococcus aureus and provide examples of experimental molecules that can inhibit both known and unknown targets in bacterial virulence factor production and biofilm formation. Structural data for protein targets that are involved in both quorum sensing and cyclic diguanylic acid signaling are needed to aid the development of molecules with drug-like properties in order to target bacterial virulence factors production and biofilm formation.
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139
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Alipour M, Suntres ZE, Lafrenie RM, Omri A. Attenuation of Pseudomonas aeruginosa virulence factors and biofilms by co-encapsulation of bismuth-ethanedithiol with tobramycin in liposomes. J Antimicrob Chemother 2010; 65:684-93. [PMID: 20159770 DOI: 10.1093/jac/dkq036] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
OBJECTIVES This study examined the activities of tobramycin and bismuth against quorum sensing, virulence factors and biofilms of Pseudomonas aeruginosa by co-encapsulating the agents in liposomes in order to achieve greater delivery of the agents. METHODS The inhibitory effects of the agents, in either their conventional (free) or vesicle-entrapped (liposomal) formulations, were assessed by measuring the changes in the quorum-sensing signal molecule N-acyl homoserine lactone, pyoverdine, pyocyanin, elastase, protease, chitinase, bacterial attachment and biofilms in vitro. RESULTS The effectiveness of tobramycin and bismuth was superior when they were co-administered as a liposomal formulation as measured by their ability to attenuate the production of N-acyl homoserine lactone, elastase (P < 0.01), protease (P < 0.05) and chitinase (P < 0.01). In the presence of non-lethal concentrations of free and liposomal tobramycin and bismuth, bacterial attachment was attenuated. Biofilm formation was also attenuated with free tobramycin and bismuth, yet, in the presence of liposomal tobramycin and bismuth, biofilm complexes could form but contained mostly dead bacteria. When established biofilms were treated with higher concentrations, free tobramycin and bismuth killed and detached bacteria, while the liposomal tobramycin and bismuth penetrated and killed bacteria in the cores of the biofilms. CONCLUSIONS These data suggest that treatment of P. aeruginosa with tobramycin and bismuth, as measured by the changes in quorum sensing, virulence factors and biofilms, is most effective when delivered as a liposomal formulation at a lower concentration compared with the free formulation.
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Affiliation(s)
- Misagh Alipour
- The Novel Drug & Vaccine Delivery Systems Facility, Department of Chemistry and Biochemistry, Laurentian University, Sudbury, Ontario, P3E 2C6, Canada
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140
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Boyd RS. Heavy Metal Pollutants and Chemical Ecology: Exploring New Frontiers. J Chem Ecol 2010; 36:46-58. [DOI: 10.1007/s10886-009-9730-5] [Citation(s) in RCA: 178] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2009] [Revised: 11/20/2009] [Accepted: 12/14/2009] [Indexed: 12/29/2022]
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141
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Peng H, Cheng Y, Ni N, Li M, Choudhary G, Chou HT, Lu CD, Tai PC, Wang B. Synthesis and evaluation of new antagonists of bacterial quorum sensing in Vibrio harveyi. ChemMedChem 2009; 4:1457-68. [PMID: 19533733 DOI: 10.1002/cmdc.200900180] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Bacterial quorum sensing has received much attention in recent years because of its relevance to pathological events such as biofilm formation. Based on the structures of two lead inhibitors (IC50: 35-55 microM) against autoinducer-2-mediated quorum sensing identified through virtual screening, we synthesized 39 analogues and examined their inhibitory activities. Twelve of these new analogues showed equal or better inhibitory activities than the lead inhibitors. The best compound showed an IC50 value of approximately 6 microM in a whole-cell assay using Vibrio harveyi as the model organism. The structure-activity relationship is discussed herein.
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Affiliation(s)
- Hanjing Peng
- Department of Chemistry and Center for Biotechnology and Drug Design, Georgia State University, P.O. Box 4098, Atlanta, GA 30302-4098, USA
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Brackman G, Celen S, Baruah K, Bossier P, Van Calenbergh S, Nelis HJ, Coenye T. AI-2 quorum-sensing inhibitors affect the starvation response and reduce virulence in several Vibrio species, most likely by interfering with LuxPQ. Microbiology (Reading) 2009; 155:4114-4122. [DOI: 10.1099/mic.0.032474-0] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
The increase of disease outbreaks caused by Vibrio species in aquatic organisms as well as in humans, together with the emergence of antibiotic resistance in Vibrio species, has led to a growing interest in alternative disease control measures. Quorum sensing (QS) is a mechanism for regulating microbial gene expression in a cell density-dependent way. While there is good evidence for the involvement of auto-inducer 2 (AI-2)-based interspecies QS in the control of virulence in multiple Vibrio species, only few inhibitors of this system are known. From the screening of a small panel of nucleoside analogues for their ability to disturb AI-2-based QS, an adenosine derivative with a p-methoxyphenylpropionamide moiety at C-3′ emerged as a promising hit. Its mechanism of inhibition was elucidated by measuring the effect on bioluminescence in a series of Vibrio harveyi AI-2 QS mutants. Our results indicate that this compound, as well as a truncated analogue lacking the adenine base, block AI-2-based QS without interfering with bacterial growth. The active compounds affected neither the bioluminescence system as such nor the production of AI-2, but most likely interfered with the signal transduction pathway at the level of LuxPQ in V. harveyi. The most active nucleoside analogue (designated LMC-21) was found to reduce the Vibrio species starvation response, to affect biofilm formation in Vibrio anguillarum, Vibrio vulnificus and Vibrio cholerae, to reduce pigment and protease production in V. anguillarum, and to protect gnotobiotic Artemia from V. harveyi-induced mortality.
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Affiliation(s)
- Gilles Brackman
- Laboratory of Pharmaceutical Microbiology, Ghent University, Harelbekestraat 72, B-9000 Ghent, Belgium
| | - Shari Celen
- Laboratory of Medicinal Chemistry, Ghent University, Harelbekestraat 72, B-9000 Ghent, Belgium
| | - Kartik Baruah
- Laboratory of Aquaculture and Artemia Reference Center, Ghent University, Rozier 44, 9000 Ghent, Belgium
| | - Peter Bossier
- Laboratory of Aquaculture and Artemia Reference Center, Ghent University, Rozier 44, 9000 Ghent, Belgium
| | - Serge Van Calenbergh
- Laboratory of Medicinal Chemistry, Ghent University, Harelbekestraat 72, B-9000 Ghent, Belgium
| | - Hans J. Nelis
- Laboratory of Pharmaceutical Microbiology, Ghent University, Harelbekestraat 72, B-9000 Ghent, Belgium
| | - Tom Coenye
- Laboratory of Pharmaceutical Microbiology, Ghent University, Harelbekestraat 72, B-9000 Ghent, Belgium
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143
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Atkinson S, Williams P. Quorum sensing and social networking in the microbial world. J R Soc Interface 2009; 6:959-78. [PMID: 19674996 PMCID: PMC2827448 DOI: 10.1098/rsif.2009.0203] [Citation(s) in RCA: 247] [Impact Index Per Article: 16.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2009] [Accepted: 07/10/2009] [Indexed: 12/15/2022] Open
Abstract
For many years, bacterial cells were considered primarily as selfish individuals, but, in recent years, it has become evident that, far from operating in isolation, they coordinate collective behaviour in response to environmental challenges using sophisticated intercellular communication networks. Cell-to-cell communication between bacteria is mediated by small diffusible signal molecules that trigger changes in gene expression in response to fluctuations in population density. This process, generally referred to as quorum sensing (QS), controls diverse phenotypes in numerous Gram-positive and Gram-negative bacteria. Recent advances have revealed that bacteria are not limited to communication within their own species but are capable of 'listening in' and 'broadcasting to' unrelated species to intercept messages and coerce cohabitants into behavioural modifications, either for the good of the population or for the benefit of one species over another. It is also evident that QS is not limited to the bacterial kingdom. The study of two-way intercellular signalling networks between bacteria and both uni- and multicellular eukaryotes as well as between eukaryotes is just beginning to unveil a rich diversity of communication pathways.
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Affiliation(s)
- Steve Atkinson
- Centre for Biomolecular Sciences, School of Molecular Medical Sciences, University of Nottingham, Nottingham NG7 2RD, UK.
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145
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Zang T, Lee BWK, Cannon LM, Ritter KA, Dai S, Ren D, Wood TK, Zhou ZS. A naturally occurring brominated furanone covalently modifies and inactivates LuxS. Bioorg Med Chem Lett 2009; 19:6200-4. [PMID: 19775890 DOI: 10.1016/j.bmcl.2009.08.095] [Citation(s) in RCA: 84] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2009] [Revised: 08/26/2009] [Accepted: 08/31/2009] [Indexed: 11/20/2022]
Abstract
Halogenated furanones, a group of natural products initially isolated from marine red algae, are known to inhibit bacterial biofilm formation, swarming, and quorum sensing. However, their molecular targets and the precise mode of action remain elusive. Herein, we show that a naturally occurring brominated furanone covalently modifies and inactivates LuxS (S-ribosylhomocysteine lyase, EC 4.4.1.21), the enzyme which produces autoinducer-2 (AI-2).
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Affiliation(s)
- Tianzhu Zang
- The Barnett Institute and the Department of Chemistry and Chemical Biology, Northeastern University, Boston, MA 02115, USA
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146
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Iskander G, Zhang R, Chan DSH, Black DS, Alamgir M, Kumar N. An efficient synthesis of brominated 4-alkyl-2(5H)-furanones. Tetrahedron Lett 2009. [DOI: 10.1016/j.tetlet.2009.05.105] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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147
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Ni N, Choudhary G, Peng H, Li M, Chou HT, Lu CD, Gilbert ES, Wang B. Inhibition of Quorum Sensing inVibrio harveyiby Boronic Acids. Chem Biol Drug Des 2009; 74:51-6. [DOI: 10.1111/j.1747-0285.2009.00834.x] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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148
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Ni N, Choudhary G, Li M, Wang B. A new phenothiazine structural scaffold as inhibitors of bacterial quorum sensing in Vibrio harveyi. Biochem Biophys Res Commun 2009; 382:153-6. [DOI: 10.1016/j.bbrc.2009.02.157] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2009] [Accepted: 02/26/2009] [Indexed: 02/03/2023]
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149
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Williams P, Cámara M. Quorum sensing and environmental adaptation in Pseudomonas aeruginosa: a tale of regulatory networks and multifunctional signal molecules. Curr Opin Microbiol 2009; 12:182-91. [PMID: 19249239 DOI: 10.1016/j.mib.2009.01.005] [Citation(s) in RCA: 535] [Impact Index Per Article: 35.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2009] [Revised: 01/19/2009] [Accepted: 01/22/2009] [Indexed: 11/24/2022]
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