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Author Spotlight: Exploring Intrinsically Disordered Protein Dynamics Through NMR Relaxation Experiments
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Nanoscopic Dynamics Dictate the Phase Separation Behavior of Intrinsically Disordered Proteins.
Katharina Laaß1, Felipe García Quiroz2, Johannes Hunold1
1Institut für Chemie, Martin-Luther-Universität Halle-Wittenberg, 06120 Halle (Saale), Germany.
Biomacromolecules
|January 6, 2021
Summary
Intrinsically disordered proteins (IDPs) phase separation is governed by hydration dynamics. A dynamic water shield around the backbone, formed by side-chain rehydration, controls IDP solubility and assembly stability.
Area of Science:
- Biochemistry
- Biophysics
- Molecular Biology
Background:
- Intrinsically disordered proteins (IDPs) drive membraneless organelle formation via liquid-liquid phase separation.
- Protein solubility and dynamics are linked to phase separation, but hydration dynamics remain poorly understood.
Purpose of the Study:
- To investigate nanoscopic hydration/dehydration dynamics in phase-separating IDPs.
- To correlate hydration dynamics with IDP liquid-like properties and assembly stability.
Main Methods:
- Utilized continuous-wave electron paramagnetic resonance (CW EPR) spectroscopy.
- Studied IDP polymers with varying liquid-like dynamics and thermal hysteresis.
Main Results:
- Observed distinct backbone and side-chain hydration dynamics in IDPs.
- Identified a 'water shield' formed by side-chain rehydration that prevents backbone hydration and governs solubility.
- Demonstrated that the water shell's strength is an IDP sequence feature encoding assembly stability.
Conclusions:
- Nanoscopic water-IDP interactions critically dictate phase separation behavior.
- Side-chain hydration dynamics play a key role in controlling IDP solubility and phase-separated assembly stability.
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