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Intrinsically Disordered Proteins02:18

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Structural Heterogeneity and Hydrodynamics of an Intrinsically Disordered Protein Condensate.

Brian R Carrick1, Laura R Stingaciu2, Bradley D Olsen1

  • 1Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States.

Journal of the American Chemical Society
|February 17, 2026
PubMed
Summary
This summary is machine-generated.

Biomolecular condensates, crucial for cell function, are formed by disordered proteins. Neutron scattering reveals how Galectin-3 proteins self-assemble into fluid-like condensates, maintaining dynamic properties even at high concentrations.

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Area of Science:

  • Biophysics
  • Cell Biology
  • Soft Matter Physics

Background:

  • Membraneless organelles control cellular functions via biomacromolecule partitioning.
  • Understanding the structure-dynamics relationship in these condensates is crucial but challenging.
  • Intrinsically disordered proteins play key roles in forming these dynamic cellular structures.

Purpose of the Study:

  • To investigate the molecular organization and dynamics of Galectin-3's N-terminal domain.
  • To elucidate the mechanisms underlying liquid-liquid phase separation driven by disordered proteins.
  • To bridge the gap between polymer physics models and biological protein behavior.

Main Methods:

  • Neutron scattering was employed to probe protein structure and dynamics.
  • Studies were conducted on Galectin-3 in both dilute and condensed phases.
  • Coarse-grained polymer models were used for quantitative analysis.

Main Results:

  • Dilute solutions showed isolated proteins and mesoscopic clusters; condensed phase exhibited a bicontinuous, microemulsion-like morphology.
  • Disordered proteins self-assembled like block copolymers, forming fluid-like condensates with slowed hydrodynamics.
  • Soft-matter physics models accurately described dilute phase behavior.

Conclusions:

  • Disordered proteins can form complex, fluid biomolecular condensates through self-assembly.
  • The study provides a molecular framework for understanding condensate formation and dynamics.
  • Neutron scattering and polymer models offer powerful tools for studying biological phase separation.