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Applied and Environmental Microbiology, January 2003, p. 154-161, Vol. 69, No. 1
0099-2240/03/$08.00+0     DOI: 10.1128/AEM.69.1.154-161.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.

Role of ctc from Listeria monocytogenes in Osmotolerance

Rozenn Gardan,* Ophélie Duché, Sabine Leroy-Sétrin, the European Listeria Genome Consortium,{dagger} and Jean Labadie

Station de Recherches sur la Viande, Institut National de la Recherche Agronomique, Theix, 63122 Saint-Genès Champanelle, France

Received 25 July 2002/ Accepted 15 October 2002

Listeria monocytogenes is a food-borne pathogen with the ability to grow under conditions of high osmolarity. In a previous study, we reported the identification of 12 proteins showing high induction after salt stress. One of these proteins is highly similar to the general stress protein Ctc of Bacillus subtilis. In this study, induction of Ctc after salt stress was confirmed at the transcriptional level by using RNA slot blot experiments. To explore the role of the ctc gene product in resistance to stresses, we constructed a ctc insertional mutant. No difference in growth was observed between the wild-type strain LO28 and the ctc mutant either in rich medium after osmotic or heat stress or in minimal medium after heat stress. However, in minimal medium after osmotic stress, the growth rate of the mutant was increased by a factor of 2. Moreover, electron microscopy analysis showed impaired morphology of the mutant grown under osmotic stress conditions in minimal medium. Addition of the osmoprotectant glycine betaine to the medium completely abolished the osmotic sensitivity phenotype of the ctc mutant. Altogether, these results suggest that the Ctc protein of L. monocytogenes is involved in osmotic stress tolerance in the absence of any osmoprotectant in the medium.

* Corresponding author. Present address: Unité de Biochimie et Structure des Protéines, Institut National de la Recherche Agronomique, 78352 Jouy-en-Josas Cedex, France. Phone: 33-1-34-65-27-70. Fax: 33-1-34-65-21-63. E-mail: rgardan{at}jouy.inra.fr.

{dagger} For a list of members of the European Listeria Genome Consortium, see http://www.pasteur.fr/actu/presse/press/01Listgen-E.html.

Applied and Environmental Microbiology, January 2003, p. 154-161, Vol. 69, No. 1
0099-2240/03/$08.00+0     DOI: 10.1128/AEM.69.1.154-161.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.



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