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Classification of proteins inducing liquid-liquid phase separation: sequential, structural and functional

Yuhei Ozawa1, Hiroto Anbo1, Motonori Ota2

  • 1Department of Life Science and Informatics, Faculty of Engineering, Maebashi Institute of Technology, 460-1, Kamisadori, Maebashi, 371-0816, Japan.

Journal of Biochemistry
|December 28, 2022
PubMed
Summary
This summary is machine-generated.

Biological condensates form through liquid-liquid phase separation (LLPS), often involving intrinsically disordered proteins. Proteins driving LLPS without partners show unique intrinsically disordered regions (IDRs) and low complexity regions (LCRs).

Keywords:
amino acid compositionbioinformatics < bioenergeticsintrinsically disordered proteinsliquid–liquid phase transitionsequence analysis

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Area of Science:

  • Cell biology
  • Biochemistry
  • Biophysics

Background:

  • Liquid-liquid phase separation (LLPS) forms biological condensates crucial for cellular processes.
  • Proteins driving LLPS often possess intrinsically disordered regions (IDRs) and low complexity regions (LCRs).

Purpose of the Study:

  • To investigate the characteristics of intrinsically disordered regions (IDRs) and low complexity regions (LCRs) in proteins driving liquid-liquid phase separation (LLPS).
  • To classify LLPS-driving proteins based on condensate composition and analyze their structural features.

Main Methods:

  • In silico analysis of LLPS-related proteins sourced from databases.
  • Classification of proteins into homo (self-driving), hetero (protein-mediated), and mixed (nucleic acid-mediated) classes.
  • Comparative analysis of IDRs and LCRs against a reference proteome.

Main Results:

  • Homo-class proteins, driving LLPS independently, exhibit distinct IDRs and LCRs compared to the reference proteome.
  • Hetero-class and mixed-class proteins showed no significant difference in IDRs and LCRs from the reference proteome.
  • Hetero-class proteins possess domains for protein-protein interactions, while mixed-class proteins have domains for nucleic acid association.

Conclusions:

  • Unique IDRs in homo-class proteins provide multivalent interaction sites essential for LLPS.
  • Hetero- and mixed-class proteins utilize a combination of LCRs, structural domains, and nucleic acids to drive LLPS.