Quorum quenching and anti‐biofilm activities of halotolerant Bacillus strains isolated in different environments in Algeria

2021 ◽  
Author(s):  
Fairouz El Aichar ◽  
Andrea Muras ◽  
Ana Parga ◽  
Ana Otero ◽  
Farida Nateche
Keyword(s):  
Quorum Quenching ◽  
Bacillus Strains

Overexpression of Pectinase Gene in Endophytic Bacillus Strains and Its Effect on Colonization

2013 ◽  
Vol 19 (5) ◽  
pp. 805-810 ◽  
Author(s):  
Xiaojing FAN ◽  
Ruixian YANG ◽  
Sixin QIU ◽  
Fangping HU
Keyword(s):  
Bacillus Strains

Properties of Cheonggukjang Fermented with Bacillus Strains with High Fibrinolytic Activities

2009 ◽  
Vol 14 (3) ◽  
pp. 252-259 ◽  
Author(s):  
Woo-Ju Jeong ◽  
Ae-Ran Lee ◽  
Ji-Yeon Chun ◽  
Jae-Ho Cha ◽  
Young-Sun Song ◽  
...  
Keyword(s):  
Bacillus Strains

Antibiotics Application Strategies to Control Biofilm Formation in Pathogenic Bacteria

2020 ◽  
Vol 21 (4) ◽  
pp. 270-286 ◽  
Author(s):  
Fazlurrahman Khan ◽  
Dung T.N. Pham ◽  
Sandra F. Oloketuyi ◽  
Young-Mog Kim
Keyword(s):  
Biofilm Formation ◽  
Pathogenic Bacteria ◽  
Extracellular Polymeric Substances ◽  
Quorum Quenching ◽  
Resistance Mechanisms ◽  
Bacterial Biofilm ◽  
Bacterial Cells ◽  
High Concentration ◽  
Biofilm Inhibition ◽  
Abiotic Surfaces

Background: The establishment of a biofilm by most pathogenic bacteria has been known as one of the resistance mechanisms against antibiotics. A biofilm is a structural component where the bacterial community adheres to the biotic or abiotic surfaces by the help of Extracellular Polymeric Substances (EPS) produced by bacterial cells. The biofilm matrix possesses the ability to resist several adverse environmental factors, including the effect of antibiotics. Therefore, the resistance of bacterial biofilm-forming cells could be increased up to 1000 times than the planktonic cells, hence requiring a significantly high concentration of antibiotics for treatment. Methods: Up to the present, several methodologies employing antibiotics as an anti-biofilm, antivirulence or quorum quenching agent have been developed for biofilm inhibition and eradication of a pre-formed mature biofilm. Results: Among the anti-biofilm strategies being tested, the sub-minimal inhibitory concentration of several antibiotics either alone or in combination has been shown to inhibit biofilm formation and down-regulate the production of virulence factors. The combinatorial strategies include (1) combination of multiple antibiotics, (2) combination of antibiotics with non-antibiotic agents and (3) loading of antibiotics onto a carrier. Conclusion: The present review paper describes the role of several antibiotics as biofilm inhibitors and also the alternative strategies adopted for applications in eradicating and inhibiting the formation of biofilm by pathogenic bacteria.

scholarly journals Anti-quorum quenching activity of methyl gallate isolated from galls of Guiera senegalensis J. F. Gmel (Combretaceae)

2019 ◽  
Vol 13 (16) ◽  
pp. 290-297 ◽  
Author(s):  
Ouedraogo Vincent ◽  
Alexandre Eric Djifaby Sombié Pierre ◽  
Compaoré Moussa ◽  
Kiendrébéogo Martin
Keyword(s):  
Quorum Quenching ◽  
Methyl Gallate ◽  
Guiera Senegalensis

scholarly journals Extract from phyllosphere bacteria with antibiofilm and quorum quenching activity to control several fish pathogenic bacteria

2021 ◽  
Vol 14 (1) ◽  
Author(s):  
Olivia Nathalia ◽  
Diana Elizabeth Waturangi
Keyword(s):  
Streptococcus Agalactiae ◽  
Aeromonas Hydrophila ◽  
Biofilm Formation ◽  
Pathogenic Bacteria ◽  
Vibrio Harveyi ◽  
Quorum Quenching ◽  
Indicator Bacteria ◽  
Antibiofilm Activity ◽  
Fish Pathogen ◽  
Phyllosphere Bacteria

Abstract Objective The objective of this research were to screen quorum quenching activity compound from phyllosphere bacteria as well as antibiofilm activity against several fish pathogen bacteria such as Aeromonas hydrophila, Streptococcus agalactiae, and Vibrio harveyi. Results We found eight phyllosphere bacteria isolates with potential quorum quenching activity to inhibit Chromobacterium violaceum as indicator bacteria. Crude extracts (20 mg/mL) showed various antibiofilm activity against fish pathogenic bacteria used in this study. Isolate JB 17B showed the highest activity to inhibit biofilm formation of A. hydrophila and V. harveyi, meanwhile isolate JB 3B showed the highest activity to inhibit biofilm of S. agalactiae. From destruction assay, isolate JB 8F showed the highest activity to disrupt biofilm of A. hydrophila isolate JB 20B showed the highest activity to disrupt biofilm of V. harveyi, isolate JB 17B also showed the highest activity to disrupt biofilm of S. agalactiae.

scholarly journals A Novel Microbial Zearalenone Transformation through Phosphorylation

Toxins ◽  
2021 ◽  
Vol 13 (5) ◽  
pp. 294
Author(s):  
Yan Zhu ◽  
Pascal Drouin ◽  
Dion Lepp ◽  
Xiu-Zhen Li ◽  
Honghui Zhu ◽  
...  
Keyword(s):  
Microbial Transformation ◽  
Acid Tolerance ◽  
Transformation Product ◽  
The United States ◽  
Corn Silage ◽  
Rrna Gene ◽  
Bacillus Spp ◽  
High Concentrations ◽  
The 16S Rrna Gene ◽  
Bacillus Strains

Zearalenone (ZEA) is a mycotoxin widely occurring in many agricultural commodities. In this study, a purified bacterial isolate, Bacillus sp. S62-W, obtained from one of 104 corn silage samples from various silos located in the United States, exhibited activity to transform the mycotoxin ZEA. A novel microbial transformation product, ZEA-14-phosphate, was detected, purified, and identified by HPLC, LC-MS, and NMR analyses. The isolate has been identified as belonging to the genus Bacillus according to phylogenetic analysis of the 16S rRNA gene and whole genome alignments. The isolate showed high efficacy in transforming ZEA to ZEA-14-phosphate (100% transformation within 24 h) and possessed advantages of acid tolerance (work at pH = 4.0), working under a broad range of temperatures (22–42 °C), and a capability of transforming ZEA at high concentrations (up to 200 µg/mL). In addition, 23 Bacillus strains of various species were tested for their ZEA phosphorylation activity. Thirteen of the Bacillus strains showed phosphorylation functionality at an efficacy of between 20.3% and 99.4% after 24 h incubation, suggesting the metabolism pathway is widely conserved in Bacillus spp. This study established a new transformation system for potential application of controlling ZEA although the metabolism and toxicity of ZEA-14-phosphate requires further investigation.

Molecular docking, quorum quenching effect, antibiofilm activity and safety profile of silver-complexed sulfonamide on Pseudomonas aeruginosa

Biofouling ◽  
2021 ◽  
pp. 1-17
Author(s):  
Fallon dos Santos Siqueira ◽  
Camilla Filippi dos Santos Alves ◽  
Alencar Kolinski Machado ◽  
Josiéli Demétrio Siqueira ◽  
Thiago dos Santos ◽  
...  
Keyword(s):  
Pseudomonas Aeruginosa ◽  
Molecular Docking ◽  
Safety Profile ◽  
Quorum Quenching ◽  
Antibiofilm Activity ◽  
Quenching Effect
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