“Quorum sensing” regulation and the structure of lux the operon in marine bacteria Aliivibrio logei

2011 ◽  
Vol 47 (12) ◽  
pp. 1415-1421 ◽  
Author(s):  
S. A. Khrulnova ◽  
I. V. Manukhov ◽  
G. B. Zavil’gel’skii
2014 ◽  
Vol 17 (1) ◽  
pp. 33-42 ◽  
Author(s):  
Jamie S. Linthorne ◽  
Barbara J. Chang ◽  
Gavin R. Flematti ◽  
Emilio L. Ghisalberti ◽  
David C. Sutton

2010 ◽  
Vol 13 (4) ◽  
pp. 722-732 ◽  
Author(s):  
Margaret E. Teasdale ◽  
Kellye A. Donovan ◽  
Stephanie R. Forschner-Dancause ◽  
David C. Rowley

2020 ◽  
Vol 13 (2) ◽  
pp. 250-262
Author(s):  
Stella Magdalena ◽  
Natassa Rustandi ◽  
Yogiara Yogiara

AbstrakKeterlibatan biofilm pada infeksi kronis dan pada permukaan peralatan medis selalu menjadi wacana penting bagi kesehatan umum di dunia. Biofilm bakteri berkaitan dengan tingkat resistensi terhadap antibiotik yang menjadikan infeksi sulit untuk diobati. Untuk mengatasi masalah ini, pengendalian yang efektif perlu diimplementasikan, seperti penerapan senyawa antibiofilm. Beberapa tahun terakhir, lingkungan akuatik menjadi salah satu sumber potensi penghasil senyawa bioaktif, termasuk senyawa antibiofilm. Tujuan dari penelitian ini yaitu menapis dan mengkarakterisasi bakteri asal air terjun dan laut yang diperoleh dari beberapa lokasi di Indonesia, sebagai penghasil aktivitas antibiofilm. Isolat dievaluasi berdasarkan kemampuan aktivitas antimikroba terhadap enam bakteri patogen dan diikuti dengan penapisan senyawa antibiofilm. Sebanyak 11 dari 65 isolat menunjukkan aktivitas quorum sensing atau quorum quenching, dan hanya terdapat satu isolat yang memiliki aktivitas keduanya. Supernatan kesebelas isolat menunjukkan penghambatan pembentukan biofilm setidaknya terhadap satu patogen dengan metode uji biofilm statis. Karakterisasi senyawa bioaktif dari lima isolat yang terpilih menunjukkan aktivitas senyawa yang berbeda, seperti karbohidrat, protein, dan asam nukleat. Sekuensing gen penyandi 16S rRNA menetapkan kelima isolat tersebut berada dalam dua genus yang berbeda, Vibrio (WK2.4, WK2.6, and WK2.3) dan Pseudomonas (S1.2 dan S1.3). Penelitian ini memberikan wawasan baru terhadap pencarian kandidat bakteri akuatik sebagai agen antibiofilm yang potensial. Abstract Biofilm involvement in chronic infections and on the surface of medical equipments have been considered as public health concern worldwide. Bacterial biofilm is related to antibiotic resistance that made the diseases difficult to treat. An effective control strategy should be implemented, for example, by applying antibiofilm agents. Recently, concerns has been given to aquatic environment as potential sources of bioactive compounds, including the antibiofilm compounds. This study aimed to screen and characterize waterfall and marine bacteria obtained from several locations in Indonesia which have antibiofilm activity. The isolates were first evaluated for their antimicrobial activity against six bacterial pathogens and followed by antibiofilm screening. Eleven out of 65 isolates showed quorum sensing or quorum quenching activity, and one of them showed both activities. Supernatants of 11 isolates inhibited biofilm formation of at least one pathogen by using static biofilm assay. Bioactive compounds characterization of the selected five isolates revealed the presence of different compounds, such as carbohydrates, proteins, and nucleic acids. The 16S rRNA gene sequencing analysis classified five isolates into two different genera, Vibrio (WK2.4, WK2.6, and WK2.3) and Pseudomonas (S1.2 and S1.3). The present study provides insights into the discovery of aquatic bacteria candidates as antibiofilm agents.


2018 ◽  
Vol 33 (12) ◽  
pp. 1819-1823 ◽  
Author(s):  
Xiaochun Chen ◽  
Jianwei Chen ◽  
Yinchun Yan ◽  
Su Chen ◽  
Xuewei Xu ◽  
...  

Marine Drugs ◽  
2019 ◽  
Vol 17 (7) ◽  
pp. 427 ◽  
Author(s):  
Anabela Borges ◽  
Manuel Simões

Antibiotic resistance has been increasingly reported for a wide variety of bacteria of clinical significance. This widespread problem constitutes one of the greatest challenges of the twenty-first century. Faced with this issue, clinicians and researchers have been persuaded to design novel strategies in order to try to control pathogenic bacteria. Therefore, the discovery and elucidation of the mechanisms underlying bacterial pathogenesis and intercellular communication have opened new perspectives for the development of alternative approaches. Antipathogenic and/or antivirulence therapies based on the interruption of quorum sensing pathways are one of several such promising strategies aimed at disarming rather than at eradicating bacterial pathogens during the course of colonization and infection. This review describes mechanisms of bacterial communication involved in biofilm formation. An overview of the potential of marine bacteria and their bioactive components as QS inhibitors is further provided.


Marine Drugs ◽  
2019 ◽  
Vol 17 (5) ◽  
pp. 275 ◽  
Author(s):  
Jing Zhao ◽  
Xinyun Li ◽  
Xiyan Hou ◽  
Chunshan Quan ◽  
Ming Chen

Quorum sensing (QS) is a phenomenon of intercellular communication discovered mainly in bacteria. A QS system consisting of QS signal molecules and regulatory protein components could control physiological behaviors and virulence gene expression of bacterial pathogens. Therefore, QS inhibition could be a novel strategy to combat pathogens and related diseases. QS inhibitors (QSIs), mainly categorized into small chemical molecules and quorum quenching enzymes, could be extracted from diverse sources in marine environment and terrestrial environment. With the focus on the exploitation of marine resources in recent years, more and more QSIs from the marine environment have been investigated. In this article, we present a comprehensive review of QSIs from marine bacteria. Firstly, screening work of marine bacteria with potential QSIs was concluded and these marine bacteria were classified. Afterwards, two categories of marine bacteria-derived QSIs were summarized from the aspects of sources, structures, QS inhibition mechanisms, environmental tolerance, effects/applications, etc. Next, structural modification of natural small molecule QSIs for future drug development was discussed. Finally, potential applications of QSIs from marine bacteria in human healthcare, aquaculture, crop cultivation, etc. were elucidated, indicating promising and extensive application perspectives of QS disruption as a novel antimicrobial strategy.


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