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X-ray Diffraction of Intact Murine Skeletal Muscle as a Tool for Studying the Structural Basis of Muscle Disease
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Structural basis for gating pore current in periodic paralysis.

Daohua Jiang1, Tamer M Gamal El-Din1, Christopher Ing2,3

  • 1Department of Pharmacology, University of Washington, Seattle, WA, USA.

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Summary
This summary is machine-generated.

Mutations in ion channels cause periodic paralysis by creating leaks. Structural studies reveal atomic mechanisms, identifying drug targets for treating muscle weakness in these inherited diseases.

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Area of Science:

  • Molecular Biology
  • Biophysics
  • Genetics

Background:

  • Periodic paralysis encompasses inherited skeletal muscle diseases causing episodic muscle weakness.
  • These conditions stem from mutations in voltage-gated sodium (Nav1.4) or calcium (Cav1.1) channels.
  • Specific mutations in gating charges (R1-R3) lead to hypokalaemic or normokalaemic forms due to cation leak.

Purpose of the Study:

  • To elucidate the atomic-level mechanisms of periodic paralysis.
  • To investigate the structural basis of cation leak in voltage-gated ion channels.
  • To identify potential drug targets for therapeutic intervention.

Main Methods:

  • High-resolution structural analysis of mutant bacterial sodium channel NavAb.
  • Molecular modeling and simulations.
  • Crystallography of NavAb(R2G) in complex with guanidinium.

Main Results:

  • Mutations R2G and R3G in NavAb did not alter voltage sensor backbone structure.
  • These mutations created aqueous cavities, facilitating cation leak.
  • R3G enabled a continuous transmembrane path in the activated state; R2G created one in the resting state.
  • Guanidinium binding sites in NavAb(R2G) suggest a drug target.

Conclusions:

  • Structural insights into gating pore formation clarify periodic paralysis pathogenesis.
  • The findings reveal atomic-level mechanisms of ion channel dysfunction.
  • Potential drug targets were identified for symptomatic relief of periodic paralysis.