Abstract
The hyperosmotic stress response of Streptococcus mutans was investigated. Real-time reverse transcriptase-PCR and slot-blot analysis revealed that opuAA, opcA, Smu.2115, sodA and nox were induced after exposure to 0.4 M NaCl. Our data suggest that there is a cross-talk between osmotic and oxidative stress responses in S. mutans. Inactivation of Smu.2115, encoding a putative oxidoreductase, resulted in an acid-resistant and hydrogen peroxide-sensitive phenotype.
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