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Regulating surface properties of designed phase-separating peptide droplets for improved dispersibility.
Ibuki Yamashita1, Keisuke Ikeda1, Syamil Muharror Ahsanul Husna2
1Faculty of Pharmaceutical Sciences, University of Toyama, Sugitani 2630, Toyama 930-0194, Japan.
Journal of Colloid and Interface Science
|August 5, 2025
Summary
Researchers designed a phase-separating peptide (RD9) that forms liquid-like droplets. Modifying RD9 with polyethylene glycol (PEG) stabilized these droplets, enhancing their dispersibility and preventing fusion for potential biomedical applications.
Area of Science:
- Biochemistry
- Materials Science
- Biophysics
Background:
- Biomolecular liquid-liquid phase separation forms functional droplets.
- Controlling droplet interface properties is crucial for applications.
- Artificial phase-separating droplets mimic biological structures.
Purpose of the Study:
- To design a simple phase-separating peptide.
- To control the interface properties of phase-separated droplets.
- To explore applications in medicine and engineering.
Main Methods:
- Designed a phase-separating peptide (RD9) using arginine-rich and aspartic acid-rich clusters.
- Synthesized RD9 modified with polyethylene glycol (PEG) polymers (2000-20,000 Da).
- Investigated droplet formation, interface binding, fusion, dispersibility, and molecular transfer.
Main Results:
- RD9 formed liquid-like droplets via electrostatic interactions at physiological conditions.
- PEGylated RD9 preferentially bound to droplet interfaces, acting like amphiphiles.
- Surface-bound PEGylated RD9 prevented droplet fusion and enhanced aqueous dispersibility.
- Droplet modification did not inhibit internal molecule transfer.
Conclusions:
- Developed a novel phase-separating peptide (RD9) and its PEGylated variant.
- Demonstrated control over artificial droplet interface properties.
- Showcased potential for medical and engineering applications through droplet stabilization.
