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Updated: May 14, 2026
13:26
Determination of Protein-ligand Interactions Using Differential Scanning Fluorimetry
Published on: September 13, 2014
Cold denaturation of a protein dimer monitored at atomic resolution
Mariusz Jaremko1, Łukasz Jaremko, Hai-Young Kim
1Department for NMR-based Structural Biology, Max Planck Institute for Biophysical Chemistry, Göttingen, Germany.
Nature Chemical Biology
|February 12, 2013
Summary
Cold denaturation and NMR reveal how the CylR2 protein unfolds. It dissociates into a monomer intermediate and then a dynamic, partially folded state critical for function and disease.
Area of Science:
- Biochemistry
- Structural Biology
- Molecular Biology
Background:
- Protein folding and unfolding are fundamental to biological processes.
- Understanding transient species in protein dynamics is vital for disease research.
- The homodimeric repressor protein CylR2's structural transitions are not fully understood.
Purpose of the Study:
- To investigate the cold-induced unfolding pathway of the homodimeric repressor protein CylR2.
- To characterize the structural properties of transient intermediates during protein unfolding.
- To elucidate the role of protein structural dynamics in biological function and disease.
Main Methods:
- Utilized cold denaturation combined with Nuclear Magnetic Resonance (NMR) spectroscopy.
- Determined seven three-dimensional structures of CylR2 across a temperature range from 25 °C to -16 °C.
- Analyzed the progressive dissociation and structural changes of CylR2 during unfolding.
Main Results:
- Observed a progressive dissociation of dimeric CylR2 into a native-like monomeric intermediate upon cold denaturation.
- Characterized the transition into a highly dynamic, partially folded state at lower temperatures.
- Identified the core of the partially folded state as critical for both biological function and misfolding.
Conclusions:
- Cold denaturation is an effective method to study protein unfolding pathways.
- CylR2 undergoes distinct structural transitions involving monomeric intermediates and partially folded states.
- The structural integrity of the partially folded state is crucial for CylR2's biological activity and implications in disease.
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