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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.

Jelcić I, Hüfner E, Schmidt H, Hertel C

Institute of Food Science and Biotechnology, Section of Food Microbiology, University of Hohenheim, Stuttgart, Germany.

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 12 May 2008 in Appl Environ Microbiol, 74(10): 3310-4.
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