Volume 254, Issue 1 pp. 55-62

Cloning and characterization of a gene encoding a cold-shock protein in Lactobacillus casei

Nicolas Sauvageot

Nicolas Sauvageot

Laboratoire de Microbiologie de l'Environnement, Université de Caen, Esplanade de la Paix, Caen Cedex, France

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Sophie Beaufils

Sophie Beaufils

Laboratoire de Microbiologie de l'Environnement, Université de Caen, Esplanade de la Paix, Caen Cedex, France

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Alain Mazé

Alain Mazé

Laboratoire de Microbiologie et Génétique Moléculaire, Thiverval-Grignon, France

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Josef Deutscher

Josef Deutscher

Laboratoire de Microbiologie et Génétique Moléculaire, Thiverval-Grignon, France

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Axel Hartke

Axel Hartke

Laboratoire de Microbiologie de l'Environnement, Université de Caen, Esplanade de la Paix, Caen Cedex, France

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First published: 09 November 2005
Citations: 3
Axel Hartke, Laboratoire de Microbiologie de l'Environnement (EA956 USC I.N.R.A. 2017), IBFA, Université de Caen, Esplanade de la Paix, F-14032 Caen Cedex, France. Tel.: +33 2 31 56 54 04; fax: +33 2 31 56 53 11; e-mail: [email protected]

Editor: Robert Burne

Abstract

One csp-like gene, called cspA, from the lactic acid bacterium Lactobacillus casei was identified by an inverse polymerase chain reaction approach based on degenerate primers. cspA encodes a protein of 66 amino acid residues, which displays at least 74% identity with Csp proteins of Lactobacillus genera. Northern blot analysis revealed that cspA is transcribed monocistronically and that its expression is induced after a temperature downshift from 37°C to 20°C. The transcriptional start site has been determined and is situated 98 bp upstream of the initiation codon. A cspA mutant strain was constructed and it showed reduced growth rate compared with the wild type at both optimal and low temperatures, demonstrating that CspA plays an important role in the physiology of L. casei.

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