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Updated: Jun 9, 2026
11:37
Analyzing Protein Dynamics Using Hydrogen Exchange Mass Spectrometry
Published on: November 29, 2013
Probing the hydrogen bonding structure in the Rieske protein
Youssef El Khoury1, Aurélien Trivella, Julien Gross
1Laboratoire de Spectroscopie Vibrationnelle et Electrochimie des Biomolécules, Institut de chimie Université de Strasbourg, 1 Rue Blaise Pascal 67000 Strasbourg, France.
Summary
Far-infrared spectroscopy reveals how hydrogen bonding and pH affect the structure and function of the Rieske protein
Area of Science:
- Biophysics
- Spectroscopy
- Protein Science
Background:
- Hydrogen bonding significantly influences protein structure and function.
- Iron-sulfur clusters are crucial in enzymatic catalysis.
- The Rieske protein is a key component in electron transport chains.
Purpose of the Study:
- To investigate the role of hydrogen bonding in the Rieske protein using far-infrared spectroscopy.
- To analyze the impact of pH and temperature on the protein's structure and iron-sulfur vibrations.
- To elucidate the relationship between protein structure, cluster environment, and enzymatic activity.
Main Methods:
- Far-infrared (FIR) spectroscopy to analyze Fe-S vibrations and hydrogen bonding.
- Variable temperature and pH measurements.
- Fourier-transform infrared (FTIR) difference spectroscopy to study redox-dependent structural changes.
Main Results:
- FIR spectra showed pH-dependent shifts in Fe-S vibrations, correlating with histidine protonation.
- A distinct hydrogen bonding network and increased structural rigidity were observed at pH > 10.
- Redox-dependent FTIR analysis confirmed pH influence and environmental effects on secondary structure.
Conclusions:
- Hydrogen bonding and pH play critical roles in regulating the structure and function of the Rieske protein.
- Structure-mediated changes in the iron-sulfur cluster environment are vital for enzymatic catalysis.
- The internal hydrogen bonding network influences the geometry and electronic properties of the iron-sulfur cluster.
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