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Binary architecture of the Nav1.2-β2 signaling complex.

Samir Das1, John Gilchrist2, Frank Bosmans2,3

  • 1Department of Biochemistry and Molecular Biology, Life Sciences Institute, University of British Columbia, Vancouver, Canada.

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|February 20, 2016
PubMed
Summary

We elucidated how β2-subunits affect sodium channel (Nav) function by determining the crystal structure of the β2 extracellular domain. This revealed specific interactions with Nav1.2, including a unique flexible loop and a disulfide bond.

Keywords:
<i>e. coli</i>X-ray structurebeta2 subunitbiophysicsdisulfidescn2bspider toxinstructural biologyvoltage-gated sodium channelxenopus

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Area of Science:

  • Structural biology
  • Neuroscience
  • Biochemistry

Background:

  • Voltage-gated sodium channels (Nav) are crucial for neuronal excitability.
  • Nav channel function is modulated by accessory β-subunits.
  • Understanding β-subunit interactions is key to deciphering Nav channel regulation.

Purpose of the Study:

  • To investigate the structural and functional mechanisms of β2-subunit interaction with Nav1.2.
  • To elucidate the role of specific β2 residues in modulating Nav channel properties.

Main Methods:

  • X-ray crystallography of the β2 extracellular domain at 1.35Å resolution.
  • Functional studies involving mutagenesis and toxin sensitivity assays.
  • Integration of structural data with bacterial Nav channel insights.

Main Results:

  • A unique flexible loop involving Cys72 and Cys75 was identified in the β2 extracellular domain.
  • Cys55 in β2 was found to influence Nav1.2 toxin susceptibility.
  • A disulfide bond between β2 Cys55 and Nav1.2 Cys910 was identified, suggesting a 1:1 stoichiometry.

Conclusions:

  • The study provides a structural basis for β2-Nav1.2 interactions.
  • Disulfide bond formation between β2 and Nav1.2 is a key mechanism of modulation.
  • These findings contribute to a model of β-subunit localization within the Nav channel complex.