Quantitative proteomics uncovers the interaction between a virulence factor and mutanobactin synthetases in Streptococcus mutans

Katherine Rainey, Landon Wilson, Stephen Barnes, Hui Wu

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Streptococcus mutans, the primary etiological agent of tooth decay, has developed multiple adhesion and virulence factors which enable it to colonize and compete with other bacteria. The putative glycosyltransferase SMU_833 is important for the virulence of S. mutans by altering the biofilm matrix composition and cariogenicity. In this study, we further characterized the smu_833 mutant by evaluating its effects on bacterial fitness. Loss of SMU_833 led to extracellular DNA-dependent bacterial aggregation. In addition, the mutant was more susceptible to oxidative stress and less competitive against H2O2 producing oral streptococci. Quantitative proteomics analysis revealed that SMU_833 deficiency resulted in the significant downregulation of 10 proteins encoded by a biosynthetic gene cluster responsible for the production of mutanobactin, a compound produced by S. mutans which helps it survive oxidative stress. Tandem affinity purification demonstrated that SMU_833 interacts with the synthetic enzymes responsible for the production of mutanobactin. Similar to the smu_833 mutant, the deletion of the mutanobactin gene cluster rendered the mutant less competitive against H2O2-producing streptococci. Our studies revealed a new link between SMU_833 virulence and mutanobactin, suggesting that SMU_833 represents a new virulent target that can be used to develop potential anticaries therapeutics.

Original languageEnglish (US)
Article numbere00429-19
JournalmSphere
Volume4
Issue number5
DOIs
StatePublished - 2019
Externally publishedYes

Keywords

  • Competition
  • Mutacin
  • Mutanobactin
  • Oxidative stress
  • Proteomics
  • Streptococcus mutans

ASJC Scopus subject areas

  • Microbiology
  • Molecular Biology

Fingerprint

Dive into the research topics of 'Quantitative proteomics uncovers the interaction between a virulence factor and mutanobactin synthetases in Streptococcus mutans'. Together they form a unique fingerprint.

Cite this