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Updated: Aug 15, 2026

Single-Molecule Measurement of Protein Interaction Dynamics Within Biomolecular Condensates
Published on: January 5, 2024
Multi-step binding-unbinding pathways govern properties of biomolecular condensates
Bhanjan Debnath1, Parag Katira2
1Department of Mechanical Engineering, San Diego State University, CA 92182, USA; Department of Chemical Engineering, IIT Hyderabad, Kandi, Sangareddy, Telangana 502285, India.
Biomolecular interactions shape cellular condensates. Different binding mechanisms yield distinct interaction lifetime distributions, impacting condensate dynamics like material exchange and aging, even with constant average lifetimes.
Area of Science:
- Biophysics
- Molecular Biology
- Cell Biology
Background:
- Biomolecular interactions govern the specificity and properties of cellular condensates.
- Research has primarily focused on interaction strengths and mean lifetimes, neglecting lifetime distributions.
Purpose of the Study:
- To investigate the impact of interaction lifetime distributions on condensate behavior.
- To explore how different binding-unbinding mechanisms influence condensate properties.
Main Methods:
- Heuristic modeling of independent and sequential multi-step binding-unbinding interactions.
- Brownian dynamics simulations combined with binding-unbinding models.
Main Results:
- Distinct binding mechanisms produce different lifetime distributions (exponential vs. truncated power-law) with similar mean lifetimes.
- Altered binding mechanisms significantly impact condensate exchange dynamics, aging, and size distribution.
Conclusions:
- Interaction lifetime distributions, not just mean lifetimes, are critical for understanding condensate behavior.
- Binding-unbinding mechanisms play a key role in determining condensate properties.
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