Simultaneous determination of protein structure and dynamics.

Area of Science:

• Biophysics
• Structural Biology
• Computational Biology

Background:

• Understanding protein structure and dynamics is crucial for molecular biology.
• Existing methods often capture static structures or limited dynamic ranges.

Purpose of the Study:

• To develop a protocol for experimentally determining ensembles of protein conformations, including native structure and dynamics.
• To combine nuclear magnetic resonance (NMR) spectroscopy and molecular dynamics (MD) simulations for comprehensive protein analysis.

Main Methods:

• Integrating atomic-level experimental data from NMR spectroscopy.
• Utilizing MD simulations to explore a wide spectrum of protein conformations.
• Applying the combined approach to human ubiquitin in solution.

Main Results:

• Demonstrated considerable conformational heterogeneity in human ubiquitin.
• Observed tightly packed interior atoms within each conformation.
• Characterized the overall behavior of interior atoms as having significant liquid-like properties.

Conclusions:

• The developed protocol provides a general method for studying protein conformational ensembles.
• This approach advances the understanding and utilization of native protein structures and dynamics.
• Highlights the inherent flexibility and dynamic nature of proteins in solution.