Glutamate Dehydrogenase (GdhA) of Streptococcus pneumoniae Is Required for High Temperature Adaptation
| Autor: | Muhammad Afzal, Sulman Shafeeq, Peter W Andrew, Andrew T. Ulijasz, Banaz O Kareem, Oscar P. Kuipers, Ozcan Gazioglu, Hasan Yesilkaya |
|---|---|
| Přispěvatelé: | Molecular Genetics |
| Rok vydání: | 2021 |
| Předmět: |
Virulence Factors
Immunology Adaptation Biological Virulence Biology medicine.disease_cause Microbiology Pneumococcal Infections Bacterial Proteins Glutamate Dehydrogenase Streptococcus pneumoniae medicine Humans Gene Microbial Viability Microarray analysis techniques Glutamate dehydrogenase Temperature Wild type Biofilm Gene Expression Regulation Bacterial biology.organism_classification Molecular Pathogenesis Galleria mellonella Infectious Diseases Biofilms Host-Pathogen Interactions Parasitology |
| Zdroj: | Infection and Immunity, 89(12):IAI0040021. AMER SOC MICROBIOLOGY Infect Immun |
| ISSN: | 1098-5522 0019-9567 |
| Popis: | During its progression from the nasopharynx to other sterile and non-sterile niches of its human host, Streptococcus pneumoniae must cope with changes in temperature. We hypothesised that the temperature adaptation is an important facet of pneumococcal survival in the host. Here, we evaluated the effect of temperature on pneumococcus and studied the role of glutamate dehydrogenase (GdhA) in thermal adaptation associated with virulence and survival. Microarray analysis revealed a significant transcriptional response to changes in temperature, affecting the expression of 252 genes in total at 34°C and 40°C relative to at 37°C. One of the differentially regulated genes was gdhA, which is upregulated at 40°C and downregulated at 34°C relative to 37°C. Deletion of gdhA attenuated the growth, cell size, biofilm formation, pH survival, and biosynthesis of proteins associated with virulence in a temperature-dependent manner. Moreover, deletion of gdhA stimulated formate production irrespective of temperature fluctuation. Finally, ΔgdhA grown at 40°C was less virulent compare to other temperatures or than the wild type at the same temperature in a Galleria mellonella infection model, suggesting that GdhA is required for pneumococcal virulence at elevated temperature. |
| Databáze: | OpenAIRE |
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