alexa Listeria monocytogenes regulates flagellar motility gene expression through MogR, a transcriptional repressor required for virulence.
Chemical Engineering

Chemical Engineering

Journal of Chromatography & Separation Techniques

Author(s): Grndling A, Burrack LS, Bouwer HG, Higgins DE

Abstract Share this page

Abstract Previous studies have shown that Listeria monocytogenes flagellar motility genes, including flaA, encoding flagellin, are transcriptionally down-regulated at 37 degrees C. For some L. monocytogenes strains, temperature-dependent motility gene expression is less stringent. By using flaA-lacZ transcriptional fusions, we identified regions upstream of the -35/-10 promoter elements that are necessary for temperature-dependent expression of flaA in L. monocytogenes strain EGDe. Whereas the sequence of the flaA promoter region was identical in L. monocytogenes strain 10403S, transcriptional activity was only partially down-regulated at 37 degrees C in 10403S. This finding suggested that a transacting regulatory protein with differential expression or activity in EGDe might be involved in temperature-dependent transcription of flaA. Indeed, a protein factor capable of specifically binding to the flaA promoter region was identified in cytoplasmic extracts of EGDe by using affinity purification and MS. Deletion of the factor-encoding gene (lmo0674) resulted in loss of temperature-dependent flaA expression and an increase in flaA promoter activity. Expression of other motility genes was also deregulated in the lmo0674 deletion. We have designated lmo0674 as mogR, indicating its role as a motility gene repressor. In tissue culture models, MogR repression of flaA during intracellular infection was independent of temperature and a deletion of mogR reduced the capacity for cell-to-cell spread. During in vivo infection, a deletion of mogR resulted in a 250-fold decrease in virulence. These studies indicate that regulation of flagellar motility gene expression and/or other genes controlled by MogR is required for full virulence of L. monocytogenes.
This article was published in Proc Natl Acad Sci U S A and referenced in Journal of Chromatography & Separation Techniques

Relevant Expert PPTs

Peer Reviewed Journals
 
Make the best use of Scientific Research and information from our 700 + peer reviewed, Open Access Journals
International Conferences 2017-18
 
Meet Inspiring Speakers and Experts at our 3000+ Global Annual Meetings

Contact Us

Agri & Aquaculture Journals

Dr. Krish

[email protected]

1-702-714-7001Extn: 9040

Biochemistry Journals

Datta A

[email protected]

1-702-714-7001Extn: 9037

Business & Management Journals

Ronald

[email protected]

1-702-714-7001Extn: 9042

Chemistry Journals

Gabriel Shaw

[email protected]

1-702-714-7001Extn: 9040

Clinical Journals

Datta A

[email protected]

1-702-714-7001Extn: 9037

Engineering Journals

James Franklin

[email protected]

1-702-714-7001Extn: 9042

Food & Nutrition Journals

Katie Wilson

[email protected]

1-702-714-7001Extn: 9042

General Science

Andrea Jason

[email protected]

1-702-714-7001Extn: 9043

Genetics & Molecular Biology Journals

Anna Melissa

[email protected]

1-702-714-7001Extn: 9006

Immunology & Microbiology Journals

David Gorantl

[email protected]

1-702-714-7001Extn: 9014

Materials Science Journals

Rachle Green

[email protected]

1-702-714-7001Extn: 9039

Nursing & Health Care Journals

Stephanie Skinner

[email protected]

1-702-714-7001Extn: 9039

Medical Journals

Nimmi Anna

[email protected]

1-702-714-7001Extn: 9038

Neuroscience & Psychology Journals

Nathan T

[email protected]

1-702-714-7001Extn: 9041

Pharmaceutical Sciences Journals

Ann Jose

[email protected]

1-702-714-7001Extn: 9007

Social & Political Science Journals

Steve Harry

[email protected]

1-702-714-7001Extn: 9042

 
© 2008- 2017 OMICS International - Open Access Publisher. Best viewed in Mozilla Firefox | Google Chrome | Above IE 7.0 version
adwords