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Structural and Kinetic Basis for the Rational Design of Next-Generation β-Lactamase Inhibitors.

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Boron-based inhibitors combat antibiotic resistance by targeting beta-lactamase enzymes. This study reveals key binding mechanisms and conserved structural features, guiding the design of new drugs to overcome bacterial resistance.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Drug Discovery

Background:

  • The rise of beta-lactamase-mediated resistance threatens the efficacy of beta-lactam antibiotics.
  • Boron-based inhibitors (BLIs) show promise for reversible covalent inhibition of beta-lactamases.
  • The molecular mechanisms of BLI binding and dissociation are not fully understood.

Purpose of the Study:

  • To investigate the binding and unbinding dynamics of the boronate BLI, LP06, using Pseudomonas-derived cephalosporinase-3 (PDC-3) as a model.
  • To elucidate the molecular basis of recognition and dissociation for boron-based beta-lactamase inhibitors.
  • To identify conserved structural determinants for designing next-generation BLIs.

Main Methods:

  • Utilized enhanced sampling strategies combined with machine learning.
  • Performed steady-state kinetic assays.
  • Conducted sequence alignment of approximately 7000 class C beta-lactamases and structural analyses.

Main Results:

  • Identified three distinct binding pathways for LP06, driven by hydrophobic motifs and a conserved arginine anchor.
  • Found that a conserved arginine (R349) acts as a key anchoring point across serine beta-lactamases.
  • Observed that hydrogen bonds can stabilize nonproductive conformations, delaying productive binding.

Conclusions:

  • Provided fundamental insights into the inhibition mechanisms of beta-lactamases by boron-based inhibitors.
  • Established design principles for developing more effective next-generation beta-lactamase inhibitors.
  • Highlighted the importance of conserved structural features and specific interactions in BLI efficacy.