Single-Molecule Dwell Times in Biomolecular Condensates

Area of Science:

• Biophysics
• Cell Biology
• Biochemistry

Background:

• Biomolecular condensates are essential membrane-free organelles.
• Molecule dwell time within condensates dictates their function.
• Understanding molecular dynamics is key to condensate biology.

Purpose of the Study:

• To develop a theoretical framework for biomolecular condensate dwell-time distributions.
• To link dwell-time signatures to underlying molecular escape mechanisms.
• To provide insights into the physical principles governing condensate function.

Main Methods:

• Analytical theory development based on single-molecule measurements.
• Modeling of molecular transport within dense phases.
• Analysis of dwell-time distributions to identify escape kinetics.

Main Results:

• Predicted dwell-time distributions show power-law followed by exponential decay.
• A -1.5 power law indicates diffusion-limited escape.
• A -0.5 power law signifies interfacial barrier-crossing-limited escape.

Conclusions:

• Dwell-time distribution shapes directly report on molecular retention mechanisms.
• The theory distinguishes between diffusion and barrier-limited escape pathways.
• Findings have broad implications for understanding and engineering biomolecular condensates.