Role of RpoS in stress survival, synthesis of extracellular autoinducer 2, and virulence in Vibrio alginolyticus

2008 ◽  
Vol 190 (5) ◽  
pp. 585-594 ◽  
Author(s):  
Yang Tian ◽  
Qiyao Wang ◽  
Qin Liu ◽  
Yue Ma ◽  
Xiaodan Cao ◽  
...  
Keyword(s):  
Vibrio Alginolyticus ◽  
Autoinducer 2 ◽  
Stress Survival

scholarly journals Short communication: The role of autoinducer 2 (AI-2) on antibiotic resistance regulation in an Escherichia coli strain isolated from a dairy cow with mastitis

2016 ◽  
Vol 99 (6) ◽  
pp. 4693-4698 ◽  
Author(s):  
Ting Xue ◽  
Lumin Yu ◽  
Fei Shang ◽  
Wenchang Li ◽  
Ming Zhang ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Antibiotic Resistance ◽  
Dairy Cow ◽  
Short Communication ◽  
Coli Strain ◽  
Autoinducer 2

Characterization of role of the toxR gene in the physiology and pathogenicity of Vibrio alginolyticus

2011 ◽  
Vol 101 (2) ◽  
pp. 281-288 ◽  
Author(s):  
Chen Chang ◽  
Wang Qing-bai ◽  
Liu Zhu-Hong ◽  
Zhao Jing-jing ◽  
Jiang Xiao ◽  
...  
Keyword(s):  
Vibrio Alginolyticus ◽  
Toxr Gene

scholarly journals LuxS-dependent AI-2 production is not involved in global regulation of natural product biosynthesis inPhotorhabdusandXenorhabdus

PeerJ ◽  
2017 ◽  
Vol 5 ◽  
pp. e3471 ◽  
Author(s):  
Antje K. Heinrich ◽  
Merle Hirschmann ◽  
Nick Neubacher ◽  
Helge B. Bode
Keyword(s):  
Regulatory System ◽  
Regulatory Rna ◽  
Insect Larvae ◽  
Phenotypic Differences ◽  
Global Regulators ◽  
Autoinducer 2 ◽  
Small Regulatory Rna ◽  
Mutant Strains ◽  
Different Strains

The Gram-negative bacteriaPhotorhabdusandXenorhabdusare known to produce a variety of different natural products (NP). These compounds play different roles since the bacteria live in symbiosis with nematodes and are pathogenic to insect larvae in the soil. Thus, a fine tuned regulatory system controlling NP biosynthesis is indispensable. Global regulators such as Hfq, Lrp, LeuO and HexA have been shown to influence NP production ofPhotorhabdusandXenorhabdus. Additionally, photopyrones as quorum sensing (QS) signals were demonstrated to be involved in the regulation of NP production inPhotorhabdus.In this study, we investigated the role of another possible QS signal, autoinducer-2 (AI-2), in regulation of NP production. The AI-2 synthase (LuxS) is widely distributed within the bacterial kingdom and has a dual role as a part of the activated methyl cycle pathway, as well as being responsible for AI-2 precursor production. We deletedluxSin three different entomopathogenic bacteria and compared NP levels in the mutant strains to the wild type (WT) but observed no difference to the WT strains. Furthermore, the absence of the small regulatory RNAmicA, which is encoded directly upstream ofluxS, did not influence NP levels. Phenotypic differences between theP. luminescens luxSdeletion mutant and an earlier describedluxSdeficient strain ofP. luminescenssuggested that two phenotypically different strains have evolved in different laboratories.

scholarly journals Growth Phase Regulation of flaA Expression in Helicobacter pylori Is luxS Dependent

2004 ◽  
Vol 72 (9) ◽  
pp. 5506-5510 ◽  
Author(s):  
John T. Loh ◽  
Mark H. Forsyth ◽  
Timothy L. Cover
Keyword(s):  
Helicobacter Pylori ◽  
Growth Phase ◽  
Wild Type ◽  
Phase Dependence ◽  
Autoinducer 2 ◽  
Extracellular Signaling ◽  
Reporter Strains ◽  
Phase Regulation ◽  
H Pylori

ABSTRACT LuxS plays a role in the synthesis of an extracellular signaling molecule, autoinducer 2 (AI-2). To analyze a possible role of AI-2 in regulating Helicobacter pylori gene expression, we constructed a panel of transcriptional reporter strains. We show that the expression of H. pylori flaA is growth phase dependent and that flaA transcription increases in association with increased culture density. Mutating the luxS gene eliminates growth-phase-dependent control of flaA, and this growth phase dependence is restored when the luxS mutant strain is complemented with the wild-type luxS gene.

Role of autoinducer-2 on the adhesion ability ofLactobacillus acidophilus

2009 ◽  
Vol 107 (1) ◽  
pp. 269-279 ◽  
Author(s):  
B.L. Buck ◽  
M.A. Azcarate-Peril ◽  
T.R. Klaenhammer
Keyword(s):  
Autoinducer 2 ◽  
Adhesion Ability

scholarly journals Expression analysis and tissue localization of IgZ in the grouper Epinephelus coioides after Vibrio alginolyticus infection and vaccination

2021 ◽  
Author(s):  
Yao-Wu Fu ◽  
Zhan-Juan Yao ◽  
Miao Cui ◽  
Qi-Zhong Zhang
Keyword(s):  
Immune Responses ◽  
Bacterial Pathogen ◽  
Head Kidney ◽  
Vibrio Alginolyticus ◽  
Economic Losses ◽  
Epinephelus Coioides ◽  
Farmed Fish ◽  
Transcriptional Changes

Abstract Background The orange-spotted grouper (Epinephelus coioides) is an important marine farmed fish in China. It is affected by the bacterial pathogen Vibrio alginolyticus, which causes high mortality and substantial economic losses. Results We studied the transcriptional changes of the IgZ gene in E. coioides following V. alginolyticus stimulation and investigated the distribution of IgZ in different tissues. The highest expression level of IgZ occurred in the head kidney. When fish were exposed to live and inactivated V. alginolyticus, the expression levels of IgZ in head kidney, spleen, intestine, gill, and blood cell were significantly upregulated. In an in situ hybridization study, IgZ mRNA-positive cells were detected in head kidney, spleen, and gill, but positive signals were not detected in liver and intestine. IgZ-labeled cells increased in the head kidney, spleen, and gill post-infection with V. alginolyticus for 21 days. Conclusions The present study provided additional evidence that IgZ was involved in mucosal immune responses against pathogens. These results help explain the role of IgZ in E. coioides defense against V. alginolyticus infection.

The role of dctP gene in regulating colonization, adhesion and pathogenicity of Vibrio alginolyticus strain HY9901

2021 ◽  
Author(s):  
Yilin Zhang ◽  
Huimin Tan ◽  
Shiping Yang ◽  
Yucong Huang ◽  
Shuanghu Cai ◽  
...  
Keyword(s):  
Vibrio Alginolyticus
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