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ROSETTALIGAND: protein-small molecule docking with full side-chain flexibility.

Jens Meiler1, David Baker

  • 1Vanderbilt University, Department of Chemistry, Center for Structural Biology, Nashville, TN 37235-8725, USA. jens@jens-meiler.de

Proteins
|September 15, 2006
PubMed
Summary

This study introduces a novel protein-small molecule docking method that simultaneously optimizes molecular orientation and protein side-chain flexibility. This approach improves the accuracy of predicting binding interfaces, crucial for drug development.

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Area of Science:

  • Computational chemistry
  • Structural biology
  • Drug discovery

Background:

  • Protein-small molecule docking is vital for drug development, requiring accurate modeling of complex structures.
  • Accurate prediction of protein-small molecule interfaces necessitates accounting for protein side-chain flexibility.

Purpose of the Study:

  • To develop and evaluate a new docking method that incorporates protein side-chain flexibility.
  • To simultaneously optimize small molecule pose and protein side-chain conformations.

Main Methods:

  • A Monte Carlo minimization procedure was employed for simultaneous optimization.
  • The energy function included van der Waals interactions, implicit solvation, explicit hydrogen bonding, and electrostatics.
  • The method was evaluated using self-docking and cross-docking calculations.

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Main Results:

  • The scoring function showed a correlation coefficient of 0.63 with experimental binding energies across 229 complexes.
  • In self-docking, the method achieved root mean square deviations (RMSD) < 2 Å in 71% of 100 cases.
  • Cross-docking yielded RMSD < 2 Å in 14 of 20 test cases.

Conclusions:

  • The developed docking method effectively models protein-small molecule interactions by including protein flexibility.
  • This approach shows promise for enhancing the accuracy of drug discovery pipelines.