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Electrostatic steering and ionic tethering in enzyme-ligand binding: insights from simulations

R C Wade1, R R Gabdoulline, S K Lüdemann

  • 1European Molecular Biology Laboratory, Meyerhofstrasse 1, 69117 Heidelberg, Germany. wade@emblheidelberg.de

Proceedings of the National Academy of Sciences of the United States of America
|May 30, 1998
PubMed
Summary

Electrostatic interactions, not just hydrophobic effects, guide ligands to enzyme active sites. Conserved electrostatic fields and ionic tethering modulate ligand binding, even for nonpolar substrates.

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Area of Science:

  • Biochemistry
  • Computational Biology
  • Structural Biology

Background:

  • Ligand binding to enzyme active sites involves diffusion and potential penetration of buried sites.
  • While hydrophobic effects are primary drivers, electrostatic interactions significantly influence binding for both charged and nonpolar ligands.

Purpose of the Study:

  • To investigate the role of electrostatic interactions in ligand-enzyme binding.
  • To identify conserved electrostatic features responsible for substrate steering.
  • To explore the mechanism of ionic tethering in modulating substrate binding.

Main Methods:

  • Brownian dynamics simulations
  • Electrostatic potential similarity analysis
  • Molecular dynamics simulations

Related Experiment Videos

  • Electrostatic continuum calculations

    • Main Results:

    • Conserved electrostatic potentials localized at active sites determine bimolecular association rates for diffusion-influenced enzymes.
    • Salt links act as tethers, modulating substrate binding by linking conformational changes.
    • Ionic tethering provides a control mechanism sensitive to the enzyme's environment, affecting even nonpolar substrate binding.

    Conclusions:

    • Electrostatic steering and ionic tethering are crucial, often overlooked, mechanisms in enzyme-ligand interactions.
    • These electrostatic effects are conserved across species and enzyme families, highlighting their fundamental importance.
    • Understanding these electrostatic dynamics offers new avenues for enzyme engineering and drug design.