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Acyl-AcpB, a FabT corepressor in Streptococcus pyogenes.

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Acyl-AcpB is the main corepressor for the fatty acid synthesis (FASII) pathway repressor FabT in Streptococcus pyogenes. Deleting AcpB affects bacterial membrane composition and adhesion, showing the importance of FASII control.

Keywords:
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Area of Science:

  • Microbiology
  • Molecular Biology
  • Biochemistry

Background:

  • Bacterial membranes are vital for cell function and composed of phospholipids synthesized via the Type II fatty acid synthesis (FASII) pathway.
  • In Streptococci, FASII gene expression is regulated by the repressor FabT, which is activated by acyl-acyl carrier proteins (ACPs).
  • Streptococcus pyogenes possesses two ACPs, AcpA and AcpB, with AcpA's role established but AcpB's function as a corepressor debated.

Purpose of the Study:

  • To investigate the role of AcpB as a corepressor for FabT in Streptococcus pyogenes.
  • To determine the impact of AcpB deletion on FASII gene expression, membrane fatty acid composition, and bacterial adhesion.

Main Methods:

  • Comparative gene expression analysis of wild-type, ΔacpB, and ΔfabT Streptococcus pyogenes strains.
  • Growth in the presence or absence of exogenous fatty acids.
  • Analysis of membrane fatty acid composition.
  • Assessment of bacterial adhesion to eukaryotic cells.

Main Results:

  • AcpB was confirmed as the primary corepressor for FabT in S. pyogenes.
  • Deletion of AcpB significantly altered membrane fatty acid composition.
  • AcpB deletion negatively impacted bacterial adhesion to host cells.
  • FASII gene repression involves a corepressor whose gene expression is not repressed by exogenous FAs.

Conclusions:

  • Acyl-AcpB plays a crucial role in regulating the FASII pathway in S. pyogenes.
  • The control of membrane composition by FASII is essential for bacterial-host interactions.
  • This study clarifies the function of AcpB in FASII regulation and its impact on bacterial virulence traits.