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Staphylococcus aureus is a Gram-positive coccus that resides harmlessly on the skin and mucous membranes of healthy individuals. When the skin barrier is breached, it can shift from a commensal to an opportunistic pathogen. This transition is facilitated by surface adhesins, such as clumping factor B and S. aureus surface protein G (SasG), which bind to structural proteins, including loricrin and cytokeratin, in the damaged epidermis. Protein A, another key factor, binds the Fc region of...
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An rpsL-based allelic exchange vector for Staphylococcus aureus.

John Chen1, Geeta Ram1, Pauline Yoong2

  • 1Skirball Institute Program in Molecular Pathogenesis, Departments of Microbiology and Medicine, New York University Medical Center, New York, NY 10016, USA.

Plasmid
|February 10, 2015
PubMed
Summary
This summary is machine-generated.

New genetic tools improve the study of Staphylococcus aureus, a common bacterial pathogen. Researchers developed improved temperature-sensitive vectors for precise genetic manipulation, aiding virulence factor research.

Keywords:
Allelic exchangeCounterselectionStaphylococcus aureusStreptomycinTemperature-sensitiverpsL

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Area of Science:

  • Microbiology
  • Bacteriology
  • Molecular Biology

Background:

  • Staphylococcus aureus is a significant bacterial pathogen with numerous virulence factors.
  • Genetic manipulation of S. aureus is crucial for understanding its virulence and host survival mechanisms.
  • Existing allelic exchange vectors often use temperature-sensitive replicons with incomplete thermosensitivity in S. aureus.

Purpose of the Study:

  • To develop improved genetic tools for Staphylococcus aureus research.
  • To create temperature-sensitive vectors with enhanced thermosensitivity for S. aureus.
  • To facilitate rapid allelic replacement mutagenesis and plasmid curing in S. aureus.

Main Methods:

  • Evaluation of the temperature-sensitive pE194ts replicon in S. aureus.
  • Development and characterization of new vectors utilizing an improved temperature-sensitive replicon (pT181 repC3).
  • Construction of rpsL-based counterselection systems for efficient allelic exchange.

Main Results:

  • The pE194ts replicon shows incomplete temperature-sensitivity in S. aureus at 42 °C.
  • The novel pT181 repC3 replicon demonstrates complete replication blockage in S. aureus at 37 °C and non-permissive temperatures.
  • New temperature-sensitive vectors enable efficient allelic replacement and plasmid curing at standard growth temperatures.

Conclusions:

  • The developed vectors offer enhanced genetic manipulation capabilities for S. aureus.
  • These tools significantly improve the efficiency and speed of generating allelic replacement mutations.
  • The expanded genetic toolkit aids in the comprehensive study of S. aureus virulence and pathogenesis.