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Electrostatic interactions drive phase separation in Pup protein.

Narendran Sekar1, Pushpkant Sahu2, Swathi Sudhakar1

  • 1Department of Applied Mechanics and Biomedical Engineering, IIT Madras, India. swathi.s@iitm.ac.in.

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Researchers modeled membrane-less organelles using a peptide-protein coacervate system. This study reveals the crucial role of electrostatics and charge density in coacervation, offering insights into cellular organization and disease mechanisms.

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Area of Science:

  • Biochemistry
  • Biophysics
  • Cell Biology

Background:

  • Membrane-less organelles (MLOs) exhibit liquid-liquid phase separation (LLPS), a phenomenon also observed in coacervates.
  • Understanding MLOs is crucial for deciphering fundamental life processes and disease mechanisms.

Purpose of the Study:

  • To develop a peptide-protein coacervative system modeling the electrostatic nature of MLOs.
  • To investigate the role of electrostatics and charge density in coacervation.

Main Methods:

  • Constructed a phase diagram for coacervate formation using poly-L-lysine (PLL) and intrinsically disordered Pup protein.
  • Utilized turbidity measurements and optical microscopy to determine phase boundaries.
  • Employed fluorescence microscopy to confirm polymer localization and pH-dependent studies to analyze electrostatic contributions.

Main Results:

  • Successfully created a peptide-protein coacervative system mimicking MLOs.
  • The phase diagram elucidated coacervate formation conditions.
  • Confirmed the presence of both Pup and PLL within coacervates.
  • Demonstrated the significant influence of pH and charge density on coacervation.

Conclusions:

  • The Pup-PLL system serves as a valuable model for studying MLOs.
  • Electrostatic interactions and charge density are critical drivers of coacervation.
  • Findings provide insights into MLOs' in vivo mechanisms and potential therapeutic strategies.