Author(s)

Masaaki Minami^1*, Syun Syun Torii¹, Michio Ohta²

¹Department of Bacteriology, Graduate School of Medical Sciences, Nagoya City University, Nagoya, Japan.
²School of Nursing, Sugiyama Jyogakuen University, Nagoya, Japan.

In Streptococcus pyogenes, we have described the two-component signal transduction sensor and regulatory systems, CovR/S affect the antimicrobial susceptibility including penicillin G before. But the mechanism how two-component sensor protein CovS modulates penicillin G susceptibility has not been elucidated till date. This study aimed to determine how the CovS affected penicillin G susceptibility in Streptococcus pyogenes by northern blot analysis. At first, we investigated the covS mRNA expression under penicillin G induction. We found that the decrease of covS mRNA expression under Penicillin G stimulation. Next we investigated the expression of cell wall synthesis gene, pbp2a and glmM with use of covS knockout mutants from emm1 Streptococcus pyogenes strain 1529. We found that the cell-wall synthesis gene expression of the ?covS mutant strain were lower than that of the wild-type strain. Furthermore the expression of glmM mRNA gene was lower than the expression of pbp2a mRNA gene in the ?covS mutant strain. The covS-complemented strain almost restored the mRNA expression compared to covS mutant strain. The two-component sensor protein CovS affects the susceptibility to penicillin G in Streptococcus pyogenes by modulation of cell-wall synthesis.

Streptococcus Pyogenes, CovS, pbp2a, glmM

Minami, M. , Syun Torii, S. and Ohta, M. (2015) The Two-Component Sensor Protein CovS Affects Penicilling Susceptibility by Modulation of Cell-Wall Synthesis in Streptococcus pyogenes. Journal of Biosciences and Medicines, 3, 50-55. doi: 10.4236/jbm.2015.33008.