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Area of Science:

  • Biophysics
  • Molecular Biology
  • Cell Biology

Background:

  • Protein-RNA phase separation forms biomolecular condensates with complex internal organization.
  • The molecular principles linking sequence, interactions, and condensate architecture are not well understood.

Purpose of the Study:

  • To identify the molecular grammar governing the formation, stability, and morphology of multiphase protein-RNA condensates.
  • To establish design principles for programming condensate architecture through sequence and composition.

Main Methods:

  • Large-scale residue-level coarse-grained simulations were employed.
  • Systematic variation of interaction asymmetries, protein stoichiometry, chain length, and condensate density.

Main Results:

  • Identified molecular rules that dictate condensate morphology (homogeneous, layered, biphasic, vesicle-like).
  • Demonstrated spontaneous formation of hollow multiphase vesicles with dense shells and dilute interiors.
  • Showcased a novel mechanism for vesicle formation independent of oversaturation or extreme charge imbalance.

Conclusions:

  • Established minimal, general principles for controlling internal condensate architecture via sequence and composition.
  • Provided a framework for engineering membrane-free vesicles and multilayered condensates with tunable properties like permeability and encapsulation.