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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

Ivan Jeli,^1, Eric Hüfner,^1, Herbert Schmidt,¹ and Christian Hertel^2*

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.

Published ahead of print on 31 March 2008.

Both of these authors contributed equally to this work.