[HTML][HTML] CcpA Coordinates Growth/Damage Balance for Streptococcus pyogenes Pathogenesis

E Paluscio, ME Watson Jr, MG Caparon - Scientific Reports, 2018 - nature.com
E Paluscio, ME Watson Jr, MG Caparon
Scientific Reports, 2018nature.com
To achieve maximum fitness, pathogens must balance growth with tissue damage,
coordinating metabolism and virulence factor expression. In the gram-positive bacterium
Streptococcus pyogenes, the DNA-binding transcriptional regulator Carbon Catabolite
Protein A (CcpA) is a master regulator of both carbon catabolite repression and virulence,
suggesting it coordinates growth/damage balance. To examine this, two murine models
were used to compare the virulence of a mutant lacking CcpA with a mutant expressing …
Abstract
To achieve maximum fitness, pathogens must balance growth with tissue damage, coordinating metabolism and virulence factor expression. In the gram-positive bacterium Streptococcus pyogenes, the DNA-binding transcriptional regulator Carbon Catabolite Protein A (CcpA) is a master regulator of both carbon catabolite repression and virulence, suggesting it coordinates growth/damage balance. To examine this, two murine models were used to compare the virulence of a mutant lacking CcpA with a mutant expressing CcpA locked into its high-affinity DNA-binding conformation (CcpAT307Y). In models of acute soft tissue infection and of long-term asymptomatic mucosal colonization, both CcpA mutants displayed altered virulence, albeit with distinct growth/damage profiles. Loss of CcpA resulted in a diminished ability to grow in tissue, leading to less damage and early clearance. In contrast, constitutive DNA-binding activity uncoupled the growth/damage relationship, such that high tissue burdens and extended time of carriage were achieved, despite reduced tissue damage. These data demonstrate that growth/damage balance can be actively controlled by the pathogen and implicate CcpA as a master regulator of this relationship. This suggests a model where the topology of the S. pyogenes virulence network has evolved to couple carbon source selection with growth/damage balance, which may differentially influence pathogenesis at distinct tissues.
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