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Related Experiment Videos

Surface solid angle-based site points for molecular docking

D K Hendrix1, I D Kuntz

  • 1Department of Pharmaceutical Chemistry, University of California, San Francisco 94143-0446, USA.

Pacific Symposium on Biocomputing. Pacific Symposium on Biocomputing
|August 11, 1998
PubMed
Summary

A new surface solid angle descriptor improves molecular modeling by identifying ligand binding sites beyond concave pockets. This method enhances the DOCK program

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DOCK 4.0: search strategies for automated molecular docking of flexible molecule databases.

Journal of computer-aided molecular design·2001

Area of Science:

  • Computational chemistry and molecular modeling
  • Structural biology and drug discovery

Background:

  • The DOCK molecular modeling program uses Sphgen for site description, which is limited to concave binding pockets.
  • Macromolecular binding sites can be solvent-exposed, necessitating a more versatile descriptor.
  • Current methods struggle to accurately represent diverse binding site geometries.

Purpose of the Study:

  • To develop a novel, more general site descriptor for the DOCK program.
  • To enable DOCK to identify ligand orientations in both buried and solvent-exposed binding regions.
  • To improve the accuracy and applicability of molecular docking simulations.

Main Methods:

  • Introduced a new site descriptor based on the surface solid angle.
  • Generated site points by calculating surface exposure and identifying similar solid angle patches.

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  • Matched shape-based site points and complementary solid angles between ligand and protein for orientation identification.
  • Evaluated ligand orientations using DOCK's force field-based scoring (Coulombic and van der Waals energy).

    • Main Results:

    • The surface solid angle descriptor effectively characterizes protein-ligand interface complementarity.
    • Demonstrated successful application on test systems: trypsin/trypsin inhibitor, chymotrypsin/turkey ovomucoid third domain, and subtilisin/chymotrypsin inhibitor.
    • Achieved ligand orientations within 1.5 Å root-mean-square deviation (r.m.s.d.) of crystal structures.

    Conclusions:

    • The surface solid angle descriptor offers a more general and accurate approach to defining binding sites for molecular docking.
    • This advancement expands the utility of the DOCK program to a wider range of macromolecular binding site types.
    • The method shows promise for enhancing drug discovery and structure-based drug design.