Journal
INTERNATIONAL DAIRY JOURNAL
Volume 19, Issue 2, Pages 89-95Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.idairyj.2008.08.004
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Funding
- Le Ministere de l'Education Nationale, de l'Enseignement Superieur et de la Recherche
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Proteolytic and acidifying properties of Streptococcus thermophilus strains isolated from yoghurt or cheeses were evaluated. Among 30 strains tested, 12 exhibited cell envelope-associated proteinase activity (PrtS(+)), three displayed a slight PrtS activity (PrtS(+/-)) and 15 were PrtS(-), despite the presence of the corresponding gene (prtS) in eight of them. Sequencing of the prtS gene in four PrtS- and one PrtS(+) strains revealed that the absence of PrtS activity in the PrtS(-) strain probably results from an alteration of the prtS regulation. The strains displaying the highest acidifying capacities were all PrtS(+). All but one PrtS(+) strains were phylogenetically close, as shown by the sequencing of their rDNA internal transcribed spacer (ITS) 16S-23S. More specifically, the high proteolytic and acidifying capacities are associated with the presence of a type II-ITS. (C) 2008 Elsevier Ltd. All rights reserved.
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