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A light-switching pyrene probe to detect phase-separated biomolecules.

Masaharu Hazawa1,2,3, Shogo Amemori1,2,4, Yoshio Nishiyama2

  • 1Institute for Frontier Science Initiative, Kanazawa University, Kanazawa, Ishikawa, Japan.

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Summary

A new probe, Pyr-A, allows scientists to study liquid-liquid phase separation (LLPS) by measuring changes in viscosity and hydrophobicity. This tool helps understand how LLPS regulates biological processes in protein droplets and centrosomes.

Keywords:
BiochemistryBiological SciencesBiological Sciences Research MethodologiesBiophysical ChemistryBiophysics

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Biophysics

Background:

  • Biomolecular liquid-liquid phase separation (LLPS) is crucial for regulating biological processes.
  • Limited tools exist to probe the physicochemical properties of phase-separated condensates.
  • Understanding LLPS is key to deciphering cellular organization and function.

Purpose of the Study:

  • To introduce a novel light-switching dipyrene probe (Pyr-A) for studying LLPS.
  • To characterize the biophysical properties of phase-separated condensates.
  • To enhance the understanding of LLPS in biological systems.

Main Methods:

  • Development of a light-switching dipyrene probe (Pyr-A).
  • Utilizing fluorescent microscopic imaging and ratiometric measurements.
  • Studying *in vitro* protein droplets and *in vivo* centrosomes.

Main Results:

  • Pyr-A exhibits distinct fluorescence spectra in hydrophobic/viscous versus aqueous environments.
  • Increased size of protein droplets correlated with increased hydrophobicity and viscosity.
  • Centrosome maturation involved increased hydrophobicity and viscosity.

Conclusions:

  • Pyr-A is an effective tool for characterizing LLPS.
  • The probe provides insights into the biophysical changes during LLPS.
  • This work advances the understanding of phase separation in biological functions.