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Methods and Strategies to Quantify Phase Separation of Disordered Proteins.

Alfredo Vidal Ceballos1, Charles J McDonald1, Shana Elbaum-Garfinkle2

  • 1Structural Biology Initiative, CUNY Advanced Science Research Center, New York, NY, United States; Ph.D Program in Biochemistry, The Graduate Center, CUNY, New York, NY, United States.

Methods in Enzymology
|November 26, 2018
PubMed
Summary
This summary is machine-generated.

Disordered protein domains drive cellular phase separation into liquid-like droplets. This chapter details methods for studying these disordered proteins and their phase behavior in vitro, crucial for understanding intracellular organization.

Keywords:
Biomolecular condensatesCoalescenceDisordered proteinsDroplet FusionLAF-1Liquid dropletsPhase separation

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Area of Science:

  • Cell Biology
  • Biophysics
  • Biochemistry

Background:

  • Phase separation is a fundamental mechanism for intracellular organization.
  • Disordered protein domains are key drivers of biomolecular condensates.
  • Studying these processes in vitro presents significant experimental challenges.

Purpose of the Study:

  • To provide general strategies for the purification, handling, imaging, and characterization of disordered proteins.
  • To outline specific methods for studying the phase behavior of disordered proteins in vitro.
  • To detail the purification of the model protein LAF-1 and the analysis of its phase separation.

Main Methods:

  • Purification of disordered proteins and the model protein LAF-1.
  • In vitro reconstitution of phase separation.
  • Construction of phase diagrams.
  • Imaging and characterization of liquid droplet properties, including fusion and coalescence.

Main Results:

  • Established protocols for handling and characterizing disordered proteins.
  • Demonstrated the utility of in vitro systems for dissecting phase separation mechanisms.
  • Quantified key parameters of liquid-like phase separation for LAF-1.

Conclusions:

  • In vitro studies of disordered proteins are essential for understanding phase separation.
  • The methods described enable detailed investigation of the biophysical properties of biomolecular condensates.
  • This work provides a foundation for further research into the role of phase separation in cellular function.