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Higher-order transient membrane protein structures.

Yuxi Zhang1,2, Hisham Mazal3,4, Venkata Shiva Mandala1,2

  • 1Laboratory of Molecular Neurobiology and Biophysics, The Rockefeller University, New York, NY 10065.

Proceedings of the National Academy of Sciences of the United States of America
|December 31, 2024
PubMed
Summary
This summary is machine-generated.

Membrane proteins like GPCRs form reversible self-clusters through weak interactions. At higher concentrations, these proteins undergo a phase transition, forming larger clusters, suggesting genetically encoded supramolecular units.

Keywords:
GPCRHOTShigher-order transient structuremembrane signalingself-assembly

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cell Biology

Background:

  • Membrane proteins play crucial roles in cellular functions.
  • Understanding their organization and interactions is key to deciphering cellular mechanisms.

Purpose of the Study:

  • To investigate the self-assembly behavior of membrane proteins at natural expression levels.
  • To explore the thermodynamic principles governing membrane protein clustering.
  • To propose a model for higher-order transient structures (HOTS) in membrane proteins.

Main Methods:

  • Utilized a cardiac-derived cell line for studying endogenous membrane proteins.
  • Analyzed cluster size distributions of specific membrane proteins (GPCRs, ion channels, enzymes).
  • Employed heterologous expression to modulate protein concentrations.
  • Applied a thermodynamic model analogous to micellization and lipid membrane formation.

Main Results:

  • Observed spontaneous self-clustering of five distinct membrane proteins at physiological expression levels.
  • Demonstrated reversible self-oligomerization driven by weak molecular interactions.
  • Identified a concentration-dependent phase transition leading to larger, bulk phase clusters.
  • Validated findings with a thermodynamic model explaining micellization and lipid bilayer formation.

Conclusions:

  • Propose the existence of higher-order transient structures (HOTS) formed by membrane proteins via weak interactions.
  • HOTS are characterized by transience, molecular specificity, and concentration-dependent size distributions.
  • Molecular specificity suggests genetically encoded supramolecular units driving membrane protein organization.