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PcdA promotes orthogonal division plane selection in Staphylococcus aureus.

Félix Ramos-León1, Brandon R Anjuwon-Foster1, Vivek Anantharaman2

  • 1Laboratory of Molecular Biology, National Cancer Institute, National Institutes of Health, Bethesda, MD, USA.

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Researchers identified PcdA as a key factor in positioning Staphylococcus aureus cell division planes. This discovery impacts understanding of bacterial growth, antibiotic resistance, and virulence.

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Area of Science:

  • Microbiology
  • Cell Biology
  • Bacterial Pathogenesis

Background:

  • Staphylococcus aureus divides by alternating orthogonal planes, but the mechanism for positioning these planes is unknown.
  • Correct positioning of bacterial cell division planes is crucial for cellular morphology and function.

Purpose of the Study:

  • To identify factors responsible for correct cell division plane placement in Staphylococcus aureus.
  • To elucidate the molecular mechanism of division plane selection in this important bacterial pathogen.

Main Methods:

  • Chemical genetic screening to identify division plane placement factors.
  • Molecular biology techniques and advanced imaging to analyze bacterial cell division.
  • Biochemical assays to study protein interactions and localization.

Main Results:

  • PcdA was identified as a novel division plane placement factor.
  • Mutations in PcdA led to non-orthogonal division plane selection.
  • PcdA, an AAA+ NTPase, interacts with FtsZ and DivIVA, localizing to division sites.
  • NTPase activity of PcdA is essential for its function, multimerization, and localization.
  • pcdA deletion disrupted clustered growth, increased antibiotic sensitivity, and reduced virulence in mice.

Conclusions:

  • The DivIVA/PcdA complex likely recruits FtsZ to establish the correct cell division plane.
  • The orthogonal division pattern in S. aureus may contribute to its survival against host defenses.
  • PcdA plays a significant role in S. aureus morphology, antibiotic resistance, and pathogenesis.