The Experts below are selected from a list of 12045 Experts worldwide ranked by ideXlab platform
Bernard Decaris - One of the best experts on this subject based on the ideXlab platform.
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The rgg 0182 gene encodes a transcriptional regulator required for the full Streptococcus thermophilus LMG18311 thermal adaptation
BMC Microbiology, 2011Co-Authors: Romain Henry, Bernard Decaris, Emmanuelle Bruneau, Rozenn Gardan, Stéphane Bertin, Betty Fleuchot, Nathalie Leblond-bourgetAbstract: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 rgg0182 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 Rgg0182 is a transcriptional regulator controlling the expression of its neighboring genes as well as chaperones and proteases encoding genes. Therefore, analysis of a Δrgg0182 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 Rgg0182 transcriptional regulator on the survival of S. thermophilus during dairy processes and more specifically during changes in temperature.
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Hydrogen peroxide effects on Streptococcus thermophilus CNRZ368 cell viability.
Research in Microbiology, 2001Co-Authors: Annabelle Thibessard, Nathalie Leblond-bourget, Annabelle Fernandez, Brigitte Gintz, Bernard DecarisAbstract:Streptococcus thermophilus CNRZ368 is an anaerobic aerotolerant bacteria and its ability to survive under aerobic growth conditions raises the question of the existence of a putative defence system against oxidative stress. Thus, survival of CNRZ368 in the presence of increasing concentrations of hydrogen peroxide was studied. Moreover, the influence of the physiologic state of the cells, as well as that of a preexposition with sublethal doses of hydrogen peroxide, upon S. thermophilus CNRZ368 survival were determined. The results suggest that S. thermophilus displays a defence system against oxidative stress and that this system is inducible.
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Hydrogen peroxide effects on Streptococcus thermophilus CNRZ368 cell viability
Research in Microbiology, 2001Co-Authors: Annabelle Thibessard, Nathalie Leblond-bourget, Annabelle Fernandez, Brigitte Gintz, Bernard DecarisAbstract:– Streptococcus thermophilus CNRZ368 is an anaerobic aerotolerant bacteria and its ability to survive under aerobic growth conditions raises the question of the existence of a putative defence system against oxidative stress. Thus, survival of CNRZ368 in the presence of increasing concentrations of hydrogen peroxide was studied. Moreover, the influence of the physiologic state of the cells, as well as that of a preexposition with sublethal doses of hydrogen peroxide, upon S. thermophilus CNRZ368 survival were determined. The results suggest that S. thermophilus displays a defence system against oxidative stress and that this system is inducible. 2001 Éditions scientifiques et médicales Elsevier SAS hydrogen peroxide / oxidative stress / S. thermophilus CNRZ368
Sandra Torriani - One of the best experts on this subject based on the ideXlab platform.
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characterization of tetracycline resistant Streptococcus thermophilus isolates from italian soft cheeses
Applied and Environmental Microbiology, 2009Co-Authors: Lucia Rizzotti, Federica La Gioia, Franco Dellaglio, Sandra TorrianiAbstract:Tetracycline-resistant Streptococcus thermophilus isolates from soft cheeses harbored the genes tet(S), tet(M), and tet(L). Molecular analysis of these genes revealed their expression, localization on plasmids or Tn916-Tn1545 family transposons, and their similarity with published sequences. The study highlights the importance of an accurate safety assessment of using S. thermophilus as a starter culture.
Christine Delorme - One of the best experts on this subject based on the ideXlab platform.
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Complete Genome Sequence of the Pigmented Streptococcus thermophilus Strain JIM8232
Journal of Bacteriology, 2011Co-Authors: Christine Delorme, Claire Bartholini, Mélanie Luraschi, Nicolas Pons, Valentin Loux, Mathieu Almeida, Eric Guédon, Jean-françois Gibrat, Pierre RenaultAbstract:Streptococcus thermophilus is a dairy species commonly used in the manufacture of cheese and yogurt. Here, we report the complete sequence of S. thermophilus strain JIM8232, isolated from milk and which produces a yellow pigment, an atypical trait for this bacterium.
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Safety assessment of dairy microorganisms: Streptococcus thermophilus.
International Journal of Food Microbiology, 2008Co-Authors: Christine DelormeAbstract:Streptococcus thermophilus is a major dairy starter used in yogurt and cheese production. In Streptococcus genus, S. thermophilus is the only one food species among commensal and opportunistic pathogen species. Comparative genomics suggest that this species recently emerged and evolved by combination of loss-of-function and horizontal gene transfer events. These gene transfer events detected in S. thermophilus have originated from other dairy species and might contribute to its adaptation to the milk environment.
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Safety assessment of dairy microorganisms:[i] Streptococcus thermophilus[/i]
International Journal of Food Microbiology, 2008Co-Authors: Christine DelormeAbstract:Streptococcus thermophilus is a major dairy starter used in yogurt and cheese production. In Streptococcus genus, S. thermophilus is the only one food species among commensal and opportunistic pathogen species. Comparative genomics suggest that this species recently emerged and evolved by combination of loss-of-function and horizontal gene transfer events. These gene transfer events detected in S. thermophilus have originated from other dairy species and might contribute to its adaptation to the milk environment.
Annabelle Thibessard - One of the best experts on this subject based on the ideXlab platform.
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Hydrogen peroxide effects on Streptococcus thermophilus CNRZ368 cell viability.
Research in Microbiology, 2001Co-Authors: Annabelle Thibessard, Nathalie Leblond-bourget, Annabelle Fernandez, Brigitte Gintz, Bernard DecarisAbstract:Streptococcus thermophilus CNRZ368 is an anaerobic aerotolerant bacteria and its ability to survive under aerobic growth conditions raises the question of the existence of a putative defence system against oxidative stress. Thus, survival of CNRZ368 in the presence of increasing concentrations of hydrogen peroxide was studied. Moreover, the influence of the physiologic state of the cells, as well as that of a preexposition with sublethal doses of hydrogen peroxide, upon S. thermophilus CNRZ368 survival were determined. The results suggest that S. thermophilus displays a defence system against oxidative stress and that this system is inducible.
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Hydrogen peroxide effects on Streptococcus thermophilus CNRZ368 cell viability
Research in Microbiology, 2001Co-Authors: Annabelle Thibessard, Nathalie Leblond-bourget, Annabelle Fernandez, Brigitte Gintz, Bernard DecarisAbstract:– Streptococcus thermophilus CNRZ368 is an anaerobic aerotolerant bacteria and its ability to survive under aerobic growth conditions raises the question of the existence of a putative defence system against oxidative stress. Thus, survival of CNRZ368 in the presence of increasing concentrations of hydrogen peroxide was studied. Moreover, the influence of the physiologic state of the cells, as well as that of a preexposition with sublethal doses of hydrogen peroxide, upon S. thermophilus CNRZ368 survival were determined. The results suggest that S. thermophilus displays a defence system against oxidative stress and that this system is inducible. 2001 Éditions scientifiques et médicales Elsevier SAS hydrogen peroxide / oxidative stress / S. thermophilus CNRZ368
Lucia Rizzotti - One of the best experts on this subject based on the ideXlab platform.
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characterization of tetracycline resistant Streptococcus thermophilus isolates from italian soft cheeses
Applied and Environmental Microbiology, 2009Co-Authors: Lucia Rizzotti, Federica La Gioia, Franco Dellaglio, Sandra TorrianiAbstract:Tetracycline-resistant Streptococcus thermophilus isolates from soft cheeses harbored the genes tet(S), tet(M), and tet(L). Molecular analysis of these genes revealed their expression, localization on plasmids or Tn916-Tn1545 family transposons, and their similarity with published sequences. The study highlights the importance of an accurate safety assessment of using S. thermophilus as a starter culture.
