Related Experiment Videos
Beta-hairpin folding simulations in atomistic detail using an implicit solvent model
B Zagrovic1, E J Sorin, V Pande
1Biophysics Program, Stanford University, CA 94305-5080, USA.
Journal of Molecular Biology
|October 17, 2001
Summary
Protein G beta-hairpin folding was simulated using distributed computing, revealing a three-state mechanism. This study details the folding pathways and intermediate states of this important protein structure.
Area of Science:
- Computational biology
- Protein folding dynamics
- Biophysics
Background:
- Protein G's C-terminal beta-hairpin is a model system for studying protein folding.
- Understanding folding pathways is crucial for protein function and disease research.
Purpose of the Study:
- To investigate the atomistic folding process of the C-terminal beta-hairpin from protein G.
- To elucidate the folding mechanism, intermediates, and dynamics using large-scale simulations.
Main Methods:
- Atomistic simulations using the GB/SA implicit solvent model at 300 K.
- Distributed computing on a supercluster of thousands of processors.
- Analysis of nearly 38 microseconds of total folding time across eight independent trajectories.
Main Results:
- Observed relaxation to an unfolded state with temporary hydrogen bonding, followed by hydrophobic interactions stabilizing a bent intermediate.
- Identified cooperative formation of the hydrophobic core and final hydrogen bonding pattern.
- Characterized short-lived semi-helical intermediates acting as a thermodynamic trap.
Conclusions:
- The folding process is consistent with a three-state mechanism with a single rate-limiting step.
- Observed variations in final hydrogen bond patterns align with experimental data.
- Semi-helical intermediates may appear early in the folding process as off-pathway traps.