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The CprS sensor kinase of the zoonotic pathogen Campylobacter jejuni influences biofilm formation and is required for optimal chick colonization.

Abstract：

:Campylobacter jejuni, a prevalent cause of bacterial gastroenteritis, must adapt to different environments to be a successful pathogen. We previously identified a C. jejuni two-component regulatory system (Cj1226/7c) as upregulated during cell infections. Analyses described herein led us to designate the system CprRS (Campylobacter planktonic growth regulation). While the response regulator was essential, a cprS sensor kinase mutant was viable. The Delta cprS mutant displayed an apparent growth defect and formed dramatically enhanced and accelerated biofilms independent of upregulation of previously characterized surface polysaccharides. Delta cprS also displayed a striking dose-dependent defect for colonization of chicks and was modestly enhanced for intracellular survival in INT407 cells. Proteomics analyses identified changes consistent with modulation of essential metabolic genes, upregulation of stress tolerance proteins, and increased expression of MOMP and FlaA. Consistent with expression profiling, we observed enhanced motility and secretion in Delta cprS, and decreased osmotolerance and oxidative stress tolerance. We also found that C. jejuni biofilms contain a DNase I-sensitive component and that biofilm formation is influenced by deoxycholate and the metabolic substrate fumarate. These results suggest that CprRS influences expression of factors important for biofilm formation, colonization and stress tolerance, and also add to our understanding of C. jejuni biofilm physiology.

journal_name

Mol Microbiol

journal_title

Molecular microbiology

authors

Svensson SL,Davis LM,MacKichan JK,Allan BJ,Pajaniappan M,Thompson SA,Gaynor EC

doi

10.1111/j.1365-2958.2008.06534.x

subject

Has Abstract

pub_date

2009-01-01 00:00:00

pages

253-72

issue

1

eissn

0950-382X

issn

1365-2958

pii

MMI6534

journal_volume

71

pub_type

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