Differential interactions determine anisotropies at interfaces of RNA-based biomolecular condensates

Nadia A. Erkamp, Mina Farag, Yuanxin Qiu, Daoyuan Qian, Tomas Sneideris, Tingting Wu, Timothy J. Welsh, Hannes Ausserwöger, Tommy J. Krug, Gaurav Chauhan, David A. Weitz, Matthew D. Lew (), Tuomas P. J. Knowles () and Rohit V. Pappu ()
Additional contact information
Nadia A. Erkamp: University of Cambridge
Mina Farag: Washington University in St. Louis
Yuanxin Qiu: Washington University in St. Louis
Daoyuan Qian: University of Cambridge
Tomas Sneideris: University of Cambridge
Tingting Wu: Washington University in St. Louis
Timothy J. Welsh: University of Cambridge
Hannes Ausserwöger: University of Cambridge
Tommy J. Krug: Harvard University
Gaurav Chauhan: Washington University in St. Louis
David A. Weitz: Harvard University
Matthew D. Lew: Washington University in St. Louis
Tuomas P. J. Knowles: University of Cambridge
Rohit V. Pappu: Washington University in St. Louis

Nature Communications, 2025, vol. 16, issue 1, 1-13

Abstract: Abstract Biomolecular condensates form via macromolecular phase separation. Here, we report results from our characterization of synthetic condensates formed by phase separation of mixtures comprising two types of RNA molecules and the biocompatible polymer polyethylene glycol. Purine-rich RNAs are scaffolds that drive phase separation via heterotypic interactions. Conversely, pyrimidine-rich RNA molecules are adsorbents defined by weaker heterotypic interactions. They adsorb onto and wet the interfaces of coexisting phases formed by scaffolds. Lattice-based simulations reproduce the phenomenology observed in experiments and these simulations predict that scaffolds and adsorbents have different non-random orientational preferences at interfaces. Dynamics at interfaces were probed using single-molecule tracking of fluorogenic probes bound to RNA molecules. These experiments revealed dynamical anisotropy at interfaces whereby motions of probe molecules parallel to the interface are faster than motions perpendicular to the interface. Taken together, our findings have broad implications for designing synthetic condensates with tunable interfacial properties.

Date: 2025
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DOI: 10.1038/s41467-025-58736-z

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