DprA-dependent exit from the competent state regulates multifaceted streptococcus pneumoniae virulence

Jingjun Lin, Gee W. Lau

Research output: Contribution to journalArticle

Abstract

Streptococcus pneumoniae (pneumococcus) causes multiple infectious diseases. The pneumococcal competence system facilitates genetic transformation, spreads antibiotic resistance, and contributes to virulence. DNA-processing protein A (DprA) regulates the exit of pneumococcus from the competent state. Previously, we have shown that DprA is important in both bacteremia and pneumonia infections. Here, we examined the mechanisms of virulence attenuation in a ΔdprA mutant. Compared to the parental wild-type D39, the ΔdprA mutant enters the competent state when exposed to lower concentrations of the competence-stimulating peptide CSP1. The ΔdprA mutant overexpresses ComM, which delays cell separation after division. Additionally, the ΔdprA mutant overexpresses allolytic factors LytA, CbpD, and CibAB and is more susceptible to detergent-triggered lysis. Disabling of the competent-state-specific induction of ComM and allolytic factors compensated for the virulence loss in the ΔdprA mutant, suggesting that overexpression of these factors contributes to virulence attenuation. Finally, the ΔdprA mutant fails to downregulate the expression of multiple competence-regulated genes, leading to the excessive energy consumption. Collectively, these results indicate that an inability to properly exit the competent state disrupts multiple cellular processes that cause virulence attenuation in the ΔdprA mutant.

Original languageEnglish (US)
Article numbere00349-19
JournalInfection and immunity
Volume87
Issue number11
DOIs
StatePublished - Jan 1 2019

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Staphylococcal Protein A
Streptococcus pneumoniae
Virulence
Mental Competency
DNA
Genetic Transformation
Cell Separation
Virulence Factors
Microbial Drug Resistance
Bacteremia
Detergents
Communicable Diseases
Pneumonia
Down-Regulation
Peptides
Infection
Genes

Keywords

  • Allolytic factors
  • Bacteremia
  • ComM
  • Competence system
  • Competence system
  • DprA
  • Pneumonia
  • Streptococcus pneumoniae

ASJC Scopus subject areas

  • Parasitology
  • Microbiology
  • Immunology
  • Infectious Diseases

Cite this

DprA-dependent exit from the competent state regulates multifaceted streptococcus pneumoniae virulence. / Lin, Jingjun; Lau, Gee W.

In: Infection and immunity, Vol. 87, No. 11, e00349-19, 01.01.2019.

Research output: Contribution to journalArticle

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