Glutamate dehydrogenase (GdhA) of is required for high temperature adaptation. Journal Article

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Authors: Gazioglu, O; Kareem, BO; Afzal, M; Shafeeq, S; Kuipers, OP; Ulijasz, AT; Andrew, PW; Yesilkaya, H
Article Title: Glutamate dehydrogenase (GdhA) of is required for high temperature adaptation.
Abstract: During its progression from the nasopharynx to other sterile and non-sterile niches of its human host, 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 which is upregulated at 40°C and downregulated at 34°C relative to 37°C. Deletion of attenuated the growth, cell size, biofilm formation, pH survival, and biosynthesis of proteins associated with virulence in a temperature-dependent manner. Moreover, deletion of stimulated formate production irrespective of temperature fluctuation. Finally, ? grown at 40°C was less virulent compare to other temperatures or than the wild type at the same temperature in a infection model, suggesting that GdhA is required for pneumococcal virulence at elevated temperature.
Journal Title: Infection and immunity
ISSN: 1098-5522; 0019-9567
Publisher: American Society for Microbiology. All Rights Reserved  
Date Published: 2021