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Researchers uncovered how the ultrastructure of polar organizing protein Z (PopZ) affects its function in biomolecular condensates. Hierarchical assembly and phase-dependent changes link molecular interactions to cellular processes.

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Area of Science:

  • Cell Biology
  • Biophysics
  • Structural Biology

Background:

  • Biomolecular condensates are crucial for regulating cellular processes.
  • The link between atomic-level features and condensate function is not well understood.

Purpose of the Study:

  • To investigate the relationship between atomic features and condensate function using polar organizing protein Z (PopZ) as a model.
  • To understand how PopZ's material properties and cellular functions are determined by its ultrastructure.

Main Methods:

  • Cryo-electron tomography
  • Biochemistry
  • Single-molecule techniques
  • Molecular dynamics simulations

Main Results:

  • PopZ forms a hierarchical filamentous condensate.
  • The helical domain promotes filamentation and condensation, while the disordered domain inhibits these processes.
  • Conformational changes are phase-dependent, regulating interfilament contacts and client binding.

Conclusions:

  • Established a multiscale framework connecting molecular interactions and ultrastructure to condensate material properties and cellular function.
  • Demonstrated how PopZ's structure dictates its role in spatiotemporal regulation of cellular processes.