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Intrinsically Disordered Proteins02:18

Intrinsically Disordered Proteins

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Intrinsically disordered proteins are a group of proteins that do not fold into specific three-dimensional structures. Their structural flexibility allows them to complement ordered proteins to perform functions that are inaccessible to rigid structures. They are more common in eukaryotes than prokaryotes and may either be exclusively intrinsically disordered or hybrid proteins, consisting of a mix of ordered and disordered regions. The absence of a rigid structure in these proteins can be...
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Whether solid, liquid, or gas, a substance's state depends on the order and arrangement of its particles (atoms, molecules, or ions). Particles in the solid pack closely together, generally in a pattern. The particles vibrate about their fixed positions but do not move or squeeze past their neighbors. In liquids, although the particles are closely spaced, they are randomly arranged. The position of the particles are not fixed—that is, they are free to move past their neighbors to...
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Phase Separation of Intrinsically Disordered Proteins.

Ammon E Posey1, Alex S Holehouse1, Rohit V Pappu1

  • 1Department of Biomedical Engineering and Center for Biological Systems Engineering, Washington University in St. Louis, St. Louis, MO, United States.

Methods in Enzymology
|November 26, 2018
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Intracellular phase transitions form biomolecular condensates. Researchers can recreate these condensates in vitro to study scaffold proteins and their sequence-driven phase separation behavior.

Keywords:
BinodalCoexistence curveIntrinsically disordered proteinsMultivalencyPhase separation

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Area of Science:

  • Biochemistry and Molecular Biology
  • Cell Biology
  • Biophysics

Background:

  • Biomolecular condensates are membraneless organelles formed by liquid-liquid phase separation (LLPS).
  • Scaffold proteins drive LLPS, while client molecules partition into these condensates.
  • Understanding LLPS is crucial for deciphering cellular organization and function.

Purpose of the Study:

  • To explore the in vitro phase separation of intrinsically disordered proteins (IDPs) as scaffolds.
  • To compare sequence-encoded information with phase separation driving forces.
  • To provide a framework for characterizing IDP phase behavior and its relation to condensate function.

Main Methods:

  • In vitro reconstitution of biomolecular condensates by titrating scaffold protein concentrations.
  • Manipulation of solution parameters (salt concentration, pH, temperature) to induce phase separation.
  • Quantification of phase behavior using coexistence curves (binodals).

Main Results:

  • Demonstration of in vitro phase separation for various scaffold proteins, including IDPs.
  • Highlighting the role of intrinsically disordered regions in driving phase separation.
  • Emphasizing the utility of binodals for quantitative analysis and comparison of phase behavior.

Conclusions:

  • In vitro studies are essential for linking protein sequence to phase separation properties.
  • Further advancements in experimental, computational, and theoretical approaches are needed.
  • Predicting in vitro phase behavior will advance our understanding of biomolecular condensate functions.