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Casein utilization by Streptococcus thermophilus results in a diauxic growth in milk
Catherine Letort1, Michèle Nardi, Peggy Garault
1Unité de Recherches Laitières et Génétique Appliquée. Unité de Biochimie et Structure des Protéines, Institut National de la Recherche Agronomique, 78352 Jouy-en-Josas Cedex, France.
Applied and Environmental Microbiology
|June 1, 2002
Abstract:
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.