Coarse-Grained Modeling and Simulation of Multistranded RNA Nanostars
Pradnya R Kadam1, Justine Lim1, Mahdi Dizani1
1†Department of Molecular, Cell, and Developmental Biology, ‡Department of Computational and Systems Biology, §Department of Mechanical and Aerospace Engineering, ∥Department of Bioengineering, ⊥Molecular Biology Institute, University of California, Los Angeles, Los Angeles, California 90095, United States.
Chem & Bio Engineering
|January 28, 2026
Summary
Synthetic RNA nanostars, inspired by biomolecular condensates, show tunable geometry and flexibility. Arm number, salt, and temperature influence their structure, aiding in designing novel RNA-based materials.
Area of Science:
- Biophysics
- Synthetic biology
- Materials science
Background:
- Biomolecular condensates regulate cellular processes via phase separation.
- Synthetic RNA nanostars offer a modular platform for engineering these condensates.
Purpose of the Study:
- Quantify the conformational dynamics of 3-, 4-, and 5-arm RNA nanostars.
- Investigate the effects of valency, salt concentration, and temperature on nanostar geometry and flexibility.
Main Methods:
- Coarse-grained modeling
- Molecular dynamics (MD) simulations using the oxRNA2 platform
Main Results:
- Increasing arm number reduced mean interarm angle but maintained flexibility.
- Salt and temperature influenced geometry and flexibility differently across nanostar valencies.
- RNA nanostars showed distinct geometric preferences compared to DNA nanostars.
Conclusions:
- Valency, salt, and temperature are key factors in controlling synthetic RNA nanostar properties.
- These findings inform the rational design of RNA nanostars for predictable material responses in engineered condensates.
Keywords:
RNA nanostarsRNA nanotechnologycoarse-grained molecular dynamicsnucleic acid nanotechnologyphase separationsynthetic condensatesMore Related Videos
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