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Streptococcus mutans murein hydrolase.

Diana M Catt1, Richard L Gregory

  • 1Department of Oral Biology, Indiana University School of Dentistry, Indianapolis, 46202, USA. dcatt@iupui.edu

Journal of Bacteriology
|November 4, 2005
PubMed
Summary
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Modifying the Streptococcus mutans SmaA protein

Area of Science:

  • Microbiology
  • Molecular Biology
  • Biochemistry

Background:

  • Streptococcus mutans is a key cariogenic bacterium.
  • Surface proteins play crucial roles in bacterial physiology and virulence.
  • Murein hydrolase activity is essential for cell wall remodeling and division.

Purpose of the Study:

  • To investigate the role of the C terminus of the Streptococcus mutans SmaA protein in murein hydrolase activity.
  • To characterize the structural features of the SmaA protein, including repeat regions.

Main Methods:

  • Allelic replacement of the C terminus of the SmaA protein.
  • Analysis of murein hydrolase activity.
  • Construction and analysis of a sortase mutant (SrtA(-)).

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Main Results:

  • Allelic replacement of the SmaA C terminus significantly altered murein hydrolase activity.
  • The SmaA protein (67-kDa) possesses an N-terminal signal sequence, cleavage site, and multiple direct repeat regions (46-aa and 88-aa).
  • A sortase mutant (SrtA(-)) exhibited an identical autolytic profile to the modified SmaA strains, suggesting sortase-independent effects.

Conclusions:

  • The C terminus of the SmaA protein is critical for regulating its murein hydrolase activity.
  • Structural features of SmaA, including repeat domains, may influence its function.
  • Sortase activity is not essential for the observed changes in autolytic profile when the SmaA C terminus is modified.