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Area of Science:

  • Materials Chemistry
  • Medicinal Chemistry
  • Nanotechnology

Background:

  • Polyoxometalate (POM)-based antibiotics have been explored for over 30 years.
  • Molybdenum-based POMs (POMos) exhibit significant potential but remain underutilized.
  • POM bioactivity is strongly dependent on their structure.

Purpose of the Study:

  • To structurally engineer wheel-shaped POMos to enhance their antibacterial properties.
  • To investigate the structure-bioactivity relationship of novel POMo architectures.
  • To develop next-generation POM-based antibiotics.

Main Methods:

  • Utilized a dimethylarsinate-involved synthetic strategy.
  • Synthesized unprecedented iso- and hetero-POMo wheels using novel building blocks and assembly routes.
  • Evaluated antibacterial efficacy against methicillin-resistant Staphylococcus aureus (MRSA) and measured minimum inhibitory concentration (MIC) and biofilm mass reduction.

Main Results:

  • Obtained novel wheel-shaped POMos, including the [MoV12MoVI18O96]24- (Mo30) structure.
  • Mo30 demonstrated a 10-fold increase in efficacy against MRSA compared to the conventional Keggin-type [PMo12O40]3- (PMo12).
  • Mo30 significantly reduced MRSA biofilm mass by 93% compared to 16% for PMo12, suggesting enhanced membrane interaction and disruption.

Conclusions:

  • The larger size and higher electronegativity of Mo30 likely contribute to its enhanced antibacterial activity.
  • Established a promising structure-bioactivity relationship for POMo wheels.
  • This work revitalizes research into POM-based antibiotics with improved performance.