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Applied and Environmental Microbiology, June 2002, p. 3162-3165, Vol. 68, No. 6
0099-2240/02/$04.00+0     DOI: 10.1128/AEM.68.6.3162-3165.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.

Casein Utilization by Streptococcus thermophilus Results in a Diauxic Growth in Milk

Catherine Letort,1 Michèle Nardi,2 Peggy Garault,2 Véronique Monnet,2 and Vincent Juillard1*

Unité de Recherches Laitières et Génétique Appliquée,1 Unité de Biochimie et Structure des Protéines, Institut National de la Recherche Agronomique, 78352 Jouy-en-Josas Cedex, France2

Received 13 September 2001/ Accepted 12 March 2002

In milk, Streptococcus thermophilus displays two distinct exponential growth phases, separated by a nonexponential one, during which proteinase synthesis was initiated. During the second exponential phase, utilization of caseins as the source of amino acids resulted in a decrease in growth rate, presumably caused by a limiting peptide transport activity.

* Corresponding author. Mailing address: Unité de Recherches Laitières et Génétique Appliquée, Institut National de la Recherche Agronomique, 78352 Jouy-en-Josas Cedex, France. Phone: (33) 134 652 068. Fax: (33) 134 652 065. E-mail: juillard{at}jouy.inra.fr.

Applied and Environmental Microbiology, June 2002, p. 3162-3165, Vol. 68, No. 6
0099-2240/02/$04.00+0     DOI: 10.1128/AEM.68.6.3162-3165.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.



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