Temporal regulation of enterohemorrhagic Escherichia coli virulence mediated by autoinducer-2

Tarun Bansal, Palmy Jesudhasan, Suresh Pillai, Thomas Keith Wood, Arul Jayaraman

Research output: Contribution to journalArticle

54 Citations (Scopus)

Abstract

The autoinducer-2 (AI-2) molecule is produced by many bacterial species, including various human gastrointestinal (GI) tract commensal bacteria, and has been proposed to be involved in interspecies communication. Because pathogens are likely to encounter AI-2 in the GI tract, we studied the effects of AI-2 on various phenotypes associated with enterohemorrhagic Escherichia coli (EHEC) infections. AI-2 attracted EHEC in agarose plug chemotaxis assays and also increased swimming motility, as well as increased EHEC attachment to HeLa cells. The molecular basis underlying the stimulation of EHEC chemotaxis, motility, and colonization by AI-2 was investigated at the transcriptome level using DNA microarrays. We found that exposure to AI-2 altered the expression of 23 locus of enterocyte effacement (LEE) genes directly involved in the production of virulence determinants, as well as other genes associated with virulence (e.g., 46 flagellar/fimbrial genes, 24 iron-related genes), in a temporally defined manner. To our knowledge, this is the first study to report AI-2-mediated regulation of EHEC chemotaxis and colonization, as well as temporal regulation of EHEC transcriptome by AI-2. Our results suggest that AI-2 is an important signal in EHEC infections of the human GI tract.

Original languageEnglish (US)
Pages (from-to)811-819
Number of pages9
JournalApplied Microbiology and Biotechnology
Volume78
Issue number5
DOIs
StatePublished - Apr 1 2008

Fingerprint

Enterohemorrhagic Escherichia coli
Virulence
Chemotaxis
Gastrointestinal Tract
Escherichia coli Infections
Transcriptome
Genes
N-octanoylhomoserine lactone
Enterocytes
Oligonucleotide Array Sequence Analysis
HeLa Cells
Sepharose
Iron
Communication
Bacteria
Phenotype

All Science Journal Classification (ASJC) codes

  • Biotechnology
  • Applied Microbiology and Biotechnology

Cite this

Bansal, Tarun ; Jesudhasan, Palmy ; Pillai, Suresh ; Wood, Thomas Keith ; Jayaraman, Arul. / Temporal regulation of enterohemorrhagic Escherichia coli virulence mediated by autoinducer-2. In: Applied Microbiology and Biotechnology. 2008 ; Vol. 78, No. 5. pp. 811-819.
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Temporal regulation of enterohemorrhagic Escherichia coli virulence mediated by autoinducer-2. / Bansal, Tarun; Jesudhasan, Palmy; Pillai, Suresh; Wood, Thomas Keith; Jayaraman, Arul.

In: Applied Microbiology and Biotechnology, Vol. 78, No. 5, 01.04.2008, p. 811-819.

Research output: Contribution to journalArticle

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