Title |
The fast milk acidifying phenotype of Streptococcus thermophilus can be acquired by natural transformation of the genomic island encoding the cell-envelope proteinase PrtS
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Published in |
Microbial Cell Factories, August 2011
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DOI | 10.1186/1475-2859-10-s1-s21 |
Pubmed ID | |
Authors |
Damien Dandoy, Christophe Fremaux, Marie Henry de Frahan, Philippe Horvath, Patrick Boyaval, Pascal Hols, Laetitia Fontaine |
Abstract |
In industrial fermentation processes, the rate of milk acidification by Streptococcus thermophilus is of major technological importance. The cell-envelope proteinase PrtS was previously shown to be a key determinant of the milk acidification activity in this species. The PrtS enzyme is tightly anchored to the cell wall via a mechanism involving the typical sortase A (SrtA) and initiates the breakdown of milk casein into small oligopeptides. The presence or absence of PrtS divides the S. thermophilus strains into two phenotypic groups i.e. the slow and the fast acidifying strains. The aim of this study was to improve the milk acidification rate of slow S. thermophilus strains, and hence optimise the fermentation process of dairy products. |
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