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Related Concept Videos

Molecular Chaperones and Protein Folding03:00

Molecular Chaperones and Protein Folding

The native conformation of a protein is formed by interactions between the side chains of its constituent amino acids. When the amino acids cannot form these interactions, the protein cannot fold by itself and needs chaperones. Notably, chaperones do not relay any additional information required for the folding of polypeptides; the native conformation of a protein is determined solely by its amino acid sequence. Chaperones catalyze protein folding without being a part of the folded protein.
The...
Amyloid Fibrils03:03

Amyloid Fibrils

Amyloid fibrils are aggregates of misfolded proteins.  Under most circumstances, misfolded proteins are either refolded by chaperone proteins or degraded by the proteasome. However, in the case of a mutation or a disease, these proteins can accumulate to form large clusters and often further assemble to form elongated fibers, called fibrils. 
Amyloid deposits were observed as early as 1639 in the liver and the spleen.   In 1854, Rudolph Virchow performed iodine staining, normally used to...
Protein Folding01:22

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Related Experiment Video

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Structure-Based Simulation and Sampling of Transcription Factor Protein Movements along DNA from Atomic-Scale Stepping to Coarse-Grained Diffusion
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Multiscale molecular dynamics of protein aggregation.

César L Avila1, Nils J D Drechsel, Raúl Alcántara

  • 1Departamento Bioquímica de la Nutrición, Instituto Superior de Investigaciones Biológicas, Tucumán, Argentina.

Current Protein & Peptide Science
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Summary

This study reviews multiscale simulation techniques for biomolecules, highlighting their use in understanding molecular aggregation. A modular schema is presented as an efficient alternative to brute-force computation.

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Area of Science:

  • Computational chemistry and biophysics
  • Molecular dynamics and simulation

Background:

  • Classical mechanics and generalized force fields were applied to biomolecules starting in the 1960s and 1970s.
  • Advanced methods like hybrid quantum mechanics/molecular mechanics (QM/MM) and improved free energy algorithms emerged in the 1970s and 1980s.
  • The 1990s saw the integration of molecular mechanics with QM and implicit solvation models in widely used software.

Purpose of the Study:

  • To review the current status of multiscale techniques for biomolecular simulations.
  • To synthesize findings into a modular schema for studying molecular aggregation.
  • To present an efficient alternative to brute-force simulations.

Main Methods:

  • Review of multiscale simulation techniques for biomolecules.
  • Development of a modular schema for analyzing aggregation processes.
  • Application of a simplified reference potential combined with free energy perturbation.

Main Results:

  • Advances in computing power enable larger systems and longer simulations (millions of particles, microsecond scale).
  • Multiscale approaches address the non-uniform distribution of relevant information across molecular structures.
  • Molecular aggregation serves as a model for multiscalability, requiring different levels of detail at different interaction distances.

Conclusions:

  • Multiscale modeling is crucial for understanding complex biomolecular processes like aggregation.
  • A modular schema provides a framework for applying these techniques.
  • Simplified reference potentials with free energy perturbation offer an efficient alternative to exhaustive all-atom simulations.