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Helicid: A novel Anti-Staphylococcus aureus adjuvant.

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Helicid (HEL) directly inhibits Staphylococcus aureus (S. aureus) virulence by binding to staphylocoagulase (Coa). This compound also enhances antibiotic efficacy, reducing bacterial load and improving survival rates in infection models.

Keywords:
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Area of Science:

  • Microbiology
  • Biochemistry
  • Pharmacology

Background:

  • Staphylococcus aureus (S. aureus) poses a significant threat due to its virulence factors, such as staphylocoagulase (Coa).
  • Developing novel strategies to combat S. aureus infections, including adjunctive therapies, is crucial.

Purpose of the Study:

  • To elucidate the mechanism by which helicid (HEL) suppresses Coa.
  • To evaluate the synergistic effects of HEL with antibiotics against S. aureus.
  • To establish HEL's potential as an antibacterial adjuvant.

Main Methods:

  • Coagulation and biofilm assays were used to assess HEL's impact on S. aureus pathogenicity.
  • Thermal shift assay, molecular dynamics simulations, and fluorescence quenching validated HEL-Coa interaction.
  • Molecular docking and point mutation assays identified key binding sites.
  • Antibiotic synergy tests and resistance induction assays evaluated HEL combined with ceftaroline fosamil (CEF-F).
  • In vivo studies in Galleria mellonella and mice assessed therapeutic efficacy and inflammatory responses.

Main Results:

  • HEL directly binds to Coa, stabilizing the protein (6°C ΔTm at 100 μM) and inhibiting S. aureus virulence.
  • HEL potentiates the bactericidal activity of CEF-F and reduces S. aureus resistance to this antibiotic.
  • Combined HEL and CEF-F treatment decreased bacterial load, improved survival in animal models, and reduced pro-inflammatory cytokines (TNF-α, IL-6, IFN-γ).

Conclusions:

  • HEL directly targets and inhibits the S. aureus virulence factor Coa.
  • HEL acts as an effective antibacterial adjuvant, enhancing the efficacy of CEF-F against S. aureus.
  • The HEL-CEF-F combination offers a promising therapeutic strategy for S. aureus-induced pneumonia, reducing lethality and antibiotic resistance.