Reconstructing folding energy landscapes by single-molecule force spectroscopy.

Area of Science:

• Biophysics
• Physical Chemistry
• Molecular Dynamics

Background:

• Molecular folding is conceptually modeled as trajectories on free energy landscapes.
• Direct measurement of these energy landscapes is challenging.
• Single-molecule force spectroscopy (SMFS) offers a powerful experimental approach.

Purpose of the Study:

• To review methods for reconstructing molecular energy landscapes from force spectroscopy data.
• To discuss the application of reconstructed landscapes in understanding folding parameters.
• To highlight challenges in measurement and interpretation.

Main Methods:

• Reconstruction of energy landscapes from equilibrium and nonequilibrium force spectroscopy measurements.
• Utilizing complementary, less demanding methods for model-dependent landscape characterization.
• Analysis of folding parameters like transition times and diffusion coefficients.

Main Results:

• Established methods for reconstructing energy landscapes from SMFS data.
• Demonstrated the utility of reconstructed landscapes for studying folding dynamics.
• Identified key folding parameters derivable from energy landscapes.

Conclusions:

• SMFS is a vital technique for experimentally probing molecular energy landscapes.
• Reconstructed landscapes provide insights into molecular folding mechanisms and timescales.
• Understanding complexities like multiple pathways is crucial for accurate interpretation.