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Model for disordered proteins with strongly sequence-dependent liquid phase behavior.

Antonia Statt1, Helena Casademunt2, Clifford P Brangwynne1

  • 1Department of Chemical and Biological Engineering, Princeton University, Princeton, New Jersey 08544, USA.

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Summary
This summary is machine-generated.

Intrinsically disordered proteins undergo phase separation to form biomolecular condensates. Minor sequence changes can lead to complex behaviors like re-entrant or aggregate phases, impacting cellular processes.

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Area of Science:

  • Biophysics
  • Biochemistry
  • Cell Biology

Background:

  • Phase separation of intrinsically disordered proteins (IDPs) is crucial for forming membraneless organelles and regulating cellular biochemical processes.
  • Biomolecular condensates, formed via phase separation, are essential cellular structures.

Purpose of the Study:

  • To investigate the phase behavior of intrinsically disordered proteins using a coarse-grained model.
  • To explore how variations in hydrophobic content and distribution affect protein phase separation.

Main Methods:

  • Simulation of a coarse-grained model for intrinsically disordered proteins.
  • Analysis of sequences with varying hydrophobic fractions and distributions.
  • Characterization of liquid-liquid phase separation, critical points, and aggregate formation.

Main Results:

  • Sequences with higher hydrophobicity exhibited conventional liquid-liquid phase separation.
  • Lower hydrophobicity sequences showed re-entrant phase behavior and aggregate formation with complex geometries.
  • Terminal bead composition influenced critical point location and interfacial tension.

Conclusions:

  • Protein sequence order significantly impacts phase behavior, leading to diverse structures beyond simple liquid phases.
  • These findings highlight the biological relevance of subtle sequence modifications in regulating protein phase separation and condensate formation.