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Investigating MreCD proteins in Streptococcus mutans revealed their crucial role in bacterial cell shape and division. Loss of these proteins impacts biofilm formation and competitiveness, highlighting their importance in this dental caries pathogen.

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Area of Science:

  • Bacterial physiology and cell biology
  • Microbial pathogenesis
  • Molecular microbiology

Background:

  • Cell shape and division are vital for bacterial survival.
  • The regulatory mechanisms for these processes in *Streptococcus mutans*, a key dental caries pathogen, are not well understood.

Purpose of the Study:

  • To characterize the function of the MreC and MreD proteins (MreCD) in *Streptococcus mutans*.
  • To elucidate the role of MreCD in bacterial cell morphology, protein interactions, gene expression, and biofilm formation.

Main Methods:

  • Cell morphology imaging
  • Bacterial two-hybrid assays for protein interactions
  • Transcriptomics and proteomics
  • Biofilm formation assays
  • Competition assays

Main Results:

  • Mutants lacking *mreCD* exhibited altered cell shape, becoming rounder than wild-type.
  • MreCD proteins interact with other cell elongation factors.
  • Absence of *mreCD* altered the surface proteome and sucrose-mediated biofilm architecture.
  • Loss of *mreCD* affected bacteriocin gene expression and reduced competitive fitness against commensal bacteria.

Conclusions:

  • Cell elongation proteins MreCD are essential for normal *Streptococcus mutans* physiology.
  • These findings provide a basis for further research into MreCD and related proteins in *S. mutans*.