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Related Experiment Videos

Membrane protein assembly patterns reflect selection for non-proliferative structures.

Arianna Rath1, Charles M Deber

  • 1Division of Molecular Structure and Function, Research Institute, Hospital for Sick Children, 555 University Avenue, Toronto, Ont., Canada M5G 1X8.

FEBS Letters
|March 14, 2007
PubMed
Summary
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Helical membrane protein complexes self-assemble into three distinct functional modes. Two assembly types correlate with protein function, distinguishing transporters from passive diffusion channels, with implications for disease.

Area of Science:

  • Structural biology
  • Biochemistry
  • Molecular biology

Background:

  • Membrane proteins regulating solute transport often form complexes from identical polypeptide chains.
  • These self-assembling systems achieve functional stoichiometry by limiting monomer recruitment.

Purpose of the Study:

  • To classify the assembly modes of helical membrane protein complexes.
  • To correlate assembly modes with protein function and potential disease implications.

Main Methods:

  • Analysis of 13 high-resolution, non-redundant homo-oligomeric structures of helical membrane proteins.
  • Classification of assembly based on sequence and stoichiometry.

Main Results:

  • Three distinct assembly modes were identified for helical membrane protein complexes.

Related Experiment Videos

  • Two of these modes segregate with protein function: energy-dependent transporters and passive diffusion channels.
  • Self-assembly pathways are limited, placing proteins near aggregation thresholds.

    • Conclusions:

    • The self-assembly of helical membrane proteins follows a limited set of rules, primarily dictated by sequence and stoichiometry.
    • These assembly principles directly influence protein function, differentiating transport mechanisms.
    • The delicate balance of self-assembly makes these proteins susceptible to mutations linked to human diseases.