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Background   Streptococcus thermophilus  is an important starter strain for the production of yogurt and cheeses. The analysis of sequenced genomes of four strains of  S. thermophilus  indicates that they contain several genes of the  rgg  familly potentially encoding transcriptional regulators. Some of the Rgg proteins are known to be involved in bacterial stress adaptation.    Results  In this study, we demonstrated that  Streptococcus thermophilus  thermal stress adaptation required the  rgg   0182   gene which transcription depends on the culture medium and the growth temperature. This gene encoded a protein showing similarity with members of the Rgg family transcriptional regulator. Our data confirmed that Rgg 0182  is a transcriptional regulator controlling the expression of its neighboring genes as well as chaperones and proteases encoding genes. Therefore, analysis of a Δ rgg   0182   mutant revealed that this protein played a role in the heat shock adaptation of  Streptococcus thermophilus  LMG18311.    Conclusions  These data showed the importance of the Rgg 0182  transcriptional regulator on the survival of  S. thermophilus  during dairy processes and more specifically during changes in temperature.

The rgg 0182 gene encodes a transcriptional regulator required for the full Streptococcus thermophilusLMG18311 thermal adaptation