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Related Experiment Video

Updated: May 11, 2026

Study of Protein Dynamics via Neutron Spin Echo Spectroscopy

Study of Protein Dynamics via Neutron Spin Echo Spectroscopy

Published on: April 13, 2022

Librational fluctuations in protein glasses.

Derek Marsh¹, Rosa Bartucci, Rita Guzzi

¹Max-Planck-Institut für biophysikalische Chemie, Göttingen, Germany. dmarsh@gwdg.de

Biochimica Et Biophysica Acta

|May 15, 2013

Summary

Electron paramagnetic resonance (EPR) spectroscopy reveals a distinct protein dynamic transition around 200K. This transition, observed in various proteins, indicates a glass transition temperature, crucial for understanding protein dynamics.

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Area of Science:

Biophysics
Protein Dynamics
Spectroscopy

Background:

Proteins exhibit complex dynamic behaviors, including a 'glass' or dynamic transition.
Understanding these transitions is key to elucidating protein function and stability.

Purpose of the Study:

To investigate librational motions in proteins near their dynamic transition.
To analyze the temperature dependence of these motions using EPR spectroscopy.

Main Methods:

Electron paramagnetic resonance (EPR) spectroscopy was employed on spin-labelled proteins: haemoglobin, serum albumin, and β-lactoglobulin.
Analysis focused on the temperature dependence of the mean-square librational amplitude, <α(2)>.

Main Results:

A discontinuity in <α(2)> was observed around 200K, consistent with a protein dynamic transition.
The temperature dependence followed the Vogel-Tammann-Fulcher equation below the transition and the Arrhenius law above it.
Similar findings were obtained for membranous Na,K-ATPase, indicating a general phenomenon.

Conclusions:

The study confirms a dynamic transition in proteins around 200K, suggesting a finite glass transition temperature.
Librational motions above this transition are governed by Arrhenius-like behavior, similar to other glass-forming systems.
These findings provide insights into protein flexibility and dynamics, relevant to biological activity.