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Applied and Environmental Microbiology, May 2008, p. 3310-3314, Vol. 74, No. 10
0099-2240/08/$08.00+0     doi:10.1128/AEM.00072-08
Copyright © 2008, American Society for Microbiology. All Rights Reserved.

Repression of the Locus of the Enterocyte Effacement-Encoded Regulator of Gene Transcription of Escherichia coli O157:H7 by Lactobacillus reuteri Culture Supernatants Is LuxS and Strain Dependent{triangledown}

Ivan Jelcic,1,{dagger} Eric Hüfner,1,{dagger} Herbert Schmidt,1 and Christian Hertel2*

Institute of Food Science and Biotechnology, Section of Food Microbiology, University of Hohenheim, Stuttgart, Germany,1 German Institute of Food Technology (DIL e.V.), Quakenbrück, Germany2

Received 10 January 2008/ Accepted 18 March 2008

Culture supernatants of Lactobacillus reuteri ATCC 55730 repressed ler expression in Escherichia coli O157:H7 cells, but neither the strain's isogenic luxS mutant nor the L. reuteri 100-23C wild-type strain and its luxS mutant elicited a comparable effect. Furthermore, the epinephrine-mediated induction of ler expression was repressed by secreted substance(s) of L. reuteri ATCC 55730.

* Corresponding author. Mailing address: German Institute of Food Technology (DIL e.V.), Professor-von-Klitzing-Straβe 7, D-49610 Quakenbrück, Germany. Phone: 49 5431 183149. Fax: 49 5431 183114. E-mail: c.hertel{at}dil-ev.de

{triangledown} Published ahead of print on 31 March 2008.

{dagger} Both of these authors contributed equally to this work.

Applied and Environmental Microbiology, May 2008, p. 3310-3314, Vol. 74, No. 10
0099-2240/08/$08.00+0     doi:10.1128/AEM.00072-08
Copyright © 2008, American Society for Microbiology. All Rights Reserved.



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