Bacterial pathogens must adapt to available nutrients in their host, so they have linked metabolism with virulence. We want to understand the mechanisms by which G+ pathogens regulate virulence in response to available carbohydrates. GAS is a significant pathogen causing an array of diseases and depends upon sugar uptake for host survival. The PTS is a conserved phosphorelay coupling sugar transport and signal transduction.The Mga regulator influences both virulence and sugar utilization genes in GAS. We've shown that Mga is phosphorylated within PTS regulatory domains (PRD) that alter Mga activity and virulence in GAS. Furthermore, homologous regulators are found in GAS and other pathogenic streptococci. We propose that Mga represents a family of PRD-containing virulence regulators (PCVR) that allows sugar metabolism to influence the disease process. This renewal will continue our studies on Mga as the archetype PCVR, while expanding our scope to include potential PCVR from pathogenic streptococci. We propose the following aims: 1) Further define functional domains of Mga and establish their conservation in other PCVRs from pathogenic streptococci;2) Delineate the role of PTS components and sugars for signaling through Mga and potentially other RALPs in GAS;3) Map the genome-wide genetic interactions of Mga in GAS using Tn-seq;4) Examine the impact of PTS signaling on Mga and potentially RALPs during GAS infection. Advancing our understanding of PCVRs has potential for broad impact in the field of G+ bacterial pathogenesis and will hopefully lead to novel strategies to treat severe infections caused by these pathogens.
Bacterial pathogens must adapt to available nutrients in their host, so they have linked metabolism with virulence. The Mga virulence regulator of the group A streptococcus (GAS) represents a family of PRD- containing virulence regulators (PCVR) that allows sugar metabolism to influence the disease process. This renewal will continue our studies on Mga as the archetype PCVR, while expanding our scope to include potential PCVR from pathogenic streptococci.
|Valdes, Kayla M; Sundar, Ganesh S; Belew, Ashton T et al. (2018) Glucose Levels Alter the Mga Virulence Regulon in the Group A Streptococcus. Sci Rep 8:4971|
|Sundar, Ganesh S; Islam, Emrul; Braza, Rezia D et al. (2018) Route of Glucose Uptake in the Group a Streptococcus Impacts SLS-Mediated Hemolysis and Survival in Human Blood. Front Cell Infect Microbiol 8:71|
|van Hensbergen, Vincent P; Movert, Elin; de Maat, Vincent et al. (2018) Streptococcal Lancefield polysaccharides are critical cell wall determinants for human Group IIA secreted phospholipase A2 to exert its bactericidal effects. PLoS Pathog 14:e1007348|
|Brouwer, Stephan; Cork, Amanda J; Ong, Cheryl-Lynn Y et al. (2018) Endopeptidase PepO Regulates the SpeB Cysteine Protease and Is Essential for the Virulence of Invasive M1T1 Streptococcus pyogenes. J Bacteriol 200:|
|Le Breton, Yoann; Belew, Ashton T; Freiberg, Jeffrey A et al. (2017) Genome-wide discovery of novel M1T1 group A streptococcal determinants important for fitness and virulence during soft-tissue infection. PLoS Pathog 13:e1006584|
|Vega, Luis A; Valdes, Kayla M; Sundar, Ganesh S et al. (2017) The Transcriptional Regulator CpsY Is Important for Innate Immune Evasion in Streptococcus pyogenes. Infect Immun 85:|
|Sundar, Ganesh S; Islam, Emrul; Gera, Kanika et al. (2017) A PTS EII mutant library in Group A Streptococcus identifies a promiscuous man-family PTS transporter influencing SLS-mediated hemolysis. Mol Microbiol 103:518-533|
|Freiberg, Jeffrey A; Le Breton, Yoann; Tran, Bao Q et al. (2016) Global Analysis and Comparison of the Transcriptomes and Proteomes of Group A Streptococcus Biofilms. mSystems 1:|
|Valdes, Kayla M; Sundar, Ganesh S; Vega, Luis A et al. (2016) The fruRBA Operon Is Necessary for Group A Streptococcal Growth in Fructose and for Resistance to Neutrophil Killing during Growth in Whole Human Blood. Infect Immun 84:1016-1031|
|van der Beek, Samantha L; Le Breton, Yoann; Ferenbach, Andrew T et al. (2015) GacA is essential for Group A Streptococcus and defines a new class of monomeric dTDP-4-dehydrorhamnose reductases (RmlD). Mol Microbiol 98:946-62|
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