Effects of LytR on bacterial morphology in Streptococcus pyognes
1 Department of Bacteriology, Nagoya City University Graduate School of Medical Sciences, Nagoya, Japan.
2 Medical Research Promotion Division, Nagoya City University, Nagoya, Japan.
3 Core Laboratory, Graduate School of Medical Sciences, Nagoya City University, Nagoya 467-8601, Japan.
4 Department of Molecular Bacteriology, Nagoya University Graduate School of Medicine, Nagoya, Japan.
Research Article
GSC Biological and Pharmaceutical Sciences, 2023, 22(02), 014–019.
Article DOI: 10.30574/gscbps.2023.22.2.0046
Publication history:
Received on 26 December 2022; revised on 01 February 2023; accepted on 04 February 2023
Abstract:
A robust cell envelope is the first line of defense in infectious pathogens when encountering host immune defenses. In Gram-positive bacteria, LytR-CpsA-Psr (LCP) family proteins play a major role in the synthesis and assembly of the cell envelope. The Gram-positive bacterium S. pyogenes causes a wide range of diseases from pharyngitis to septicemia, but the involvement of LytR in the synthesis and assembly of the cell wall envelope in this bacterium is not clear. Therefore, we investigated whether LytR of S. pyogenes, like LytR of other streptococci, is involved in cell wall formation. The lytR gene-deficient strains were used to investigate the bacteria's ability to form a chaining, drug sensitivity to penicillin G, an inhibitor of cell wall synthesis, bacterial biofilm formation, and the morphological structure of bacteria by transmission electron microscopy, and the expression of pbp2b, which encodes a penicillin-binding protein, compared with the wild-type strain. Our results showed that LytR-deficient strains had reduced bacterial chaining compared to wild-type strains. Compared to wild-type strains, LytR-deficient strains were also more drug sensitive to the cell wall synthesis inhibitor penicillin G. This genetic study was accompanied by increased expression of the pbp2b gene in the LytR-deficient strains. In addition, the LytR-deficient strain showed a reduced ability to form biofilms, and the lytR gene-deficient strain showed morphological irregularities with abnormal bacterial septa. These results indicate that the lytR gene is involved in cell wall synthesis in S. pyognes.
Keywords:
S. pyogenes; LytR; morphology; Biofilm; PCG susceptibility
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