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Protein Folding

Protein Folding

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Protein Folding

Proteins are chains of amino acids linked together by peptide bonds. Upon synthesis, a protein folds into a three-dimensional conformation, critical to its biological function. Interactions between its constituent amino acids guide protein folding, and hence the protein structure is primarily dependent on its amino acid sequence.
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Protein Folding

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Microfluidic Mixers for Studying Protein Folding

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Characterizing a partially ordered miniprotein through folding molecular dynamics simulations: Comparison with the

Athanasios S Baltzis¹, Nicholas M Glykos¹

¹Department of Molecular Biology and Genetics, Democritus University of Thrace, University Campus, Alexandroupolis, 68100, Greece.

Protein Science : a Publication of the Protein Society

|November 27, 2015

Summary

Molecular dynamics simulations accurately predict the behavior of the HP21 peptide, a model for fast-folding miniproteins. This computational approach aids in understanding the structure of marginally stable peptides.

Keywords:

force fields molecular dynamics simulations peptide folding peptide structure villin headpiece

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Area of Science:

Biophysics
Computational Biology
Protein Folding

Background:

The villin headpiece helical subdomain (HP36) serves as a model system for studying fast-folding miniproteins.
HP21, a fragment of HP36, exhibits persistent native-like structure in solution despite being largely unfolded, as evidenced by NMR chemical shifts.

Purpose of the Study:

To compare experimental data of the HP21 peptide with results from a long molecular dynamics simulation.
To validate the utility of molecular dynamics simulations for characterizing marginally stable peptides.

Main Methods:

A 15-microsecond molecular dynamics simulation of HP21 in explicit water with full electrostatics was performed.
Comparison of simulation-derived structural and chemical shift data with experimental NMR data.
Analysis of secondary structure propensity scores from the simulation.

Main Results:

The simulation accurately reproduced experimental findings, showing HP21 is predominantly disordered (<10% stable structures).
The most populated conformer in the simulation closely matched the native-like structure of HP36 (RMSD < 1 Å).
Simulation-derived chemical shifts and secondary structure propensities showed good agreement with experimental data, highlighting the first helix's stability.

Conclusions:

Long molecular dynamics simulations in explicit solvent can reliably predict the structural ensemble of marginally stable peptides like HP21.
This computational approach is a valuable tool for the structural characterization of fast-folding miniproteins and similar systems.