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Related Concept Videos

Protein Organization01:24

Protein Organization

Proteins are polymers of amino acid residues. They are versatile and responsible for different cellular functions, including DNA replication, molecular transport, catalysis, and structural support. Proteins have a hierarchical structure comprising at least three levels of organization: primary, secondary, and tertiary structure. Some large proteins have a quaternary structure where individual protein subunits are linked together.
The primary structure of a protein is its amino acid sequence.

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Related Experiment Video

Updated: May 13, 2026

A Protocol for Computer-Based Protein Structure and Function Prediction
16:41

A Protocol for Computer-Based Protein Structure and Function Prediction

Published on: November 3, 2011

Protein Structure Refinement through Structure Selection and Averaging from Molecular Dynamics Ensembles.

Vahid Mirjalili1, Michael Feig

  • 1Department of Biochemistry and Molecular Biology, Michigan State University, East Lansing, MI 48824; USA ; Department of Mechanical Engineering, Michigan State University, East Lansing, MI 48824; USA.

Journal of Chemical Theory and Computation
|March 26, 2013
PubMed
Summary
This summary is machine-generated.

This study introduces a molecular dynamics (MD) simulation protocol to refine protein models. MD simulations with ensemble averaging offer consistent refinement for template-based models.

Keywords:
force fieldmodel selectionmolecular dynamics simulationscoringstructure prediction

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Last Updated: May 13, 2026

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Area of Science:

  • Computational Biology
  • Structural Bioinformatics
  • Molecular Modeling

Background:

  • Template-based modeling is a primary method for predicting protein structures.
  • Refinement of these models is crucial for improving accuracy and reliability.
  • Existing refinement methods may have limitations in efficiency and effectiveness.

Purpose of the Study:

  • To develop and evaluate a novel protocol for refining template-based protein models using molecular dynamics (MD) simulations.
  • To assess the efficacy of MD-based sampling combined with ensemble averaging for structure refinement.
  • To determine the general applicability of the proposed protocol across various protein systems.

Main Methods:

  • A protocol employing molecular dynamics (MD) simulations for structure refinement was designed.
  • Key steps include applying restraints, ensemble averaging of subsets, and interpolation between structures.
  • The refinement protocol was tested on protein targets from the Critical Assessment of protein Structure Prediction (CASP) experiments.

Main Results:

  • The MD simulation-based protocol demonstrated moderate but consistent refinement capabilities.
  • Sub-microsecond MD sampling, when integrated with ensemble averaging, proved effective for most tested systems.
  • The refinement success was systematically assessed, showing positive outcomes for CASP targets.

Conclusions:

  • The described MD simulation protocol offers a viable approach for refining template-based protein models.
  • Ensemble averaging in conjunction with MD sampling enhances the refinement process.
  • This method shows promise for improving the accuracy of predicted protein structures in computational biology.