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Related Experiment Videos

Testing a flexible-receptor docking algorithm in a model binding site.

Binqing Q Wei1, Larry H Weaver, Anna M Ferrari

  • 1Department of Pharmaceutical Chemistry, University of California, 600 16th St, San Francisco, CA 94143-2240, USA.

Journal of Molecular Biology
|March 30, 2004
PubMed
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Sampling receptor flexibility in molecular docking is crucial. A new method improves ligand discovery by considering discrete receptor conformations and their associated energies, leading to successful prospective drug design.

Area of Science:

  • Computational chemistry and molecular modeling
  • Drug discovery and development
  • Structural biology

Background:

  • Sampling receptor flexibility is a significant challenge in molecular docking for drug discovery.
  • Traditional docking methods often treat receptors as rigid structures, potentially missing flexible binding sites.
  • Accurately modeling protein flexibility is essential for identifying novel ligands.

Purpose of the Study:

  • To develop and evaluate a novel algorithm for sampling receptor flexibility in database docking.
  • To assess the method's ability to identify known and novel ligands.
  • To investigate the impact of receptor conformational energy on docking enrichment.

Main Methods:

  • A method was developed to independently treat multiple flexible regions of a binding site, generating discrete conformations.

Related Experiment Videos

  • This algorithm scales linearly with receptor degrees of freedom.
  • Docking simulations were performed using the Available Chemical Directory (ACD) against ensembles of receptor conformations, with and without receptor conformational energy weighting.

    • Main Results:

    • Initial retrospective tests showed improved ligand enrichment when docking against a flexible receptor ensemble compared to a single apo conformation, especially when including receptor conformational energy.
    • Prospective testing against a lysozyme mutant identified 14 out of 18 novel compounds that bind to the target cavity.
    • X-ray crystallography confirmed the binding of seven ligands, with predicted geometries closely matching observed structures and revealing significant receptor conformational changes.

    Conclusions:

    • Sampling receptor flexibility can uncover novel ligands missed by rigid-structure docking.
    • Incorporating receptor conformational energy into the docking process is critical for accurate ligand ranking and enrichment.
    • The developed method shows promise for prospective drug discovery, though it may not capture all unanticipated receptor conformational changes.