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Related Experiment Videos

New features and enhancements in the X-PLOR computer program.

J Badger1, R A Kumar, P Yip

  • 1Molecular Simulations Inc., San Diego, California, USA. badger@sdsc.edu

Proteins
|March 25, 1999
PubMed
Summary
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X-PLOR 98.0 software introduces advanced methods for X-ray crystallography and nuclear magnetic resonance (NMR) structure determination. These updates enhance refinement accuracy and model optimization for biological macromolecules.

Area of Science:

  • Structural Biology
  • Biophysics
  • Computational Chemistry

Background:

  • Accurate determination of macromolecular structures is crucial for understanding biological function.
  • Existing methods for X-ray crystallography and NMR structure determination have limitations in refinement and optimization.
  • The X-PLOR software is a widely used tool for structural biology research.

Purpose of the Study:

  • To introduce and describe the new features and methodologies in the X-PLOR 98.0 software release.
  • To enhance X-ray crystallographic refinement and NMR structure determination.
  • To improve the accuracy and efficiency of structural model building and refinement.

Main Methods:

  • Implementation of maximum likelihood methods for X-ray crystallographic refinement.

Related Experiment Videos

  • Addition of Andersen thermal coupling for simulated annealing refinements.
  • Development of validated scripts and performance enhancements for NMR structure determination using torsion angle dynamics.
  • Fast code for direct nuclear Overhauser effect (NOE) refinement.
  • Methodologies for automated iterative peak assignment and structure determination using ambiguous restraints.
  • Implementation of adaptive bulk solvent correction and second derivative energy minimization for crystal structure refinement.

    • Main Results:

    • Trial crystallographic refinements show significantly improved convergence with enhanced protocols.
    • The quality of refined crystal structures is comparable to models obtained using torsion angle dynamics.
    • Test applications of the new energy minimizer for NMR structure refinement demonstrate improved convergence and more optimized final models.
    • New features facilitate automated structure determination from NMR data.

    Conclusions:

    • X-PLOR 98.0 offers significant advancements in both X-ray crystallographic and NMR structure determination.
    • The enhanced methods lead to improved convergence and higher quality structural models.
    • The software provides powerful tools for automated structure determination and refinement, advancing structural biology research.