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Related Experiment Videos

Simulated dipeptide recognition by vancomycin

D Li1, U Sreenivasan, N Juranic

  • 1Department of Pharmacology, University of Pennsylvania, Philadelphia 19104-6084, USA.

Journal of Molecular Recognition : JMR
|March 1, 1997
PubMed
Summary
This summary is machine-generated.

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Vancomycin antibiotic binding to bacterial cell walls involves precise molecular recognition. Dynamic simulations reveal how subtle structural and hydrogen bond differences in vancomycin-peptide complexes influence antibiotic binding affinity.

Area of Science:

  • Molecular Biology
  • Biochemistry
  • Computational Chemistry

Background:

  • Vancomycin and glycopeptide antibiotics exhibit antimicrobial properties through specific interactions with bacterial cell wall components.
  • Understanding the precise molecular mechanisms of antibiotic-target recognition is crucial for developing new antimicrobial therapies.

Purpose of the Study:

  • To investigate the dynamic interactions between the vancomycin aglycon and two distinct dipeptide ligands (Ac-D-ala-D-ala and Ac-D-ala-gly).
  • To elucidate how structural and dynamic factors contribute to the differential binding affinities of these complexes.

Main Methods:

  • Development of dynamic molecular models for vancomycin-dipeptide complexes.
  • Utilizing molecular dynamics simulations, initially guided by 2D Nuclear Magnetic Resonance (NMR) constraints.

Related Experiment Videos

  • Employing free energy calculations to predict and validate relative binding affinities.

    • Main Results:

    • Simulations demonstrated conformational stability, consistent with NMR data, after constraint removal.
    • Free energy calculations accurately predicted the relative binding affinities of the two complexes.
    • Identified distinct differences in intermolecular hydrogen bonding, antibiotic conformation, and overall complex structure despite similar ligand conformations.

    Conclusions:

    • Dynamic simulations provide a validated framework for analyzing vancomycin-dipeptide interactions.
    • Interplay of structural dynamics, hydrogen bonding, and conformational changes dictates binding affinity.
    • These findings offer insights into the molecular basis of glycopeptide antibiotic efficacy.