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Related Experiment Video

Updated: Jul 28, 2025

Multi-photon Intracellular Sodium Imaging Combined with UV-mediated Focal Uncaging of Glutamate in CA1 Pyramidal Neurons
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Structural mapping of Na

Qiurong Wu1, Jian Huang2, Xiao Fan3

  • 1Beijing Frontier Research Center for Biological Structures, Tsinghua-Peking Joint Center for Life Sciences, School of Life Sciences, Tsinghua University, Beijing, 100084, China.

Nature Communications
|June 3, 2023
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Summary
This summary is machine-generated.

This study reveals novel drug-binding sites on voltage-gated sodium (Nav) channels using cryo-EM structures. Understanding these binding modes advances drug development for epilepsy, pain, and arrhythmia.

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Area of Science:

  • Biophysics
  • Pharmacology
  • Structural Biology

Background:

  • Voltage-gated sodium (Nav) channels are crucial drug targets for neurological and cardiac conditions.
  • The precise binding mechanisms of many Nav channel modulators are not fully understood.
  • Recent structural studies have provided insights, but a comprehensive map of drug interactions is lacking.

Purpose of the Study:

  • To elucidate the high-resolution structures of human Nav1.7 in complex with various drugs and drug candidates.
  • To identify and characterize novel drug-binding sites within the Nav channel.
  • To provide a structural basis for understanding the pharmacology of Nav channel modulators.

Main Methods:

  • High-resolution cryo-electron microscopy (cryo-EM) was employed to determine structures.
  • Structures were resolved at 2.6–3.2 Å for human Nav1.7 complexed with carbamazepine, bupivacaine, lacosamide, vinpocetine, hardwickiic acid, and vixotrigine.
  • Comparative analysis with existing structural data was performed.

Main Results:

  • A binding site beneath the intracellular gate (site BIG) was identified, accommodating carbamazepine, bupivacaine, and lacosamide.
  • A second binding site for lacosamide was found within the selectivity filter, accessible from the central cavity.
  • Vinpocetine and hardwickiic acid bind to the III-IV fenestration, while vixotrigine binds to the IV-I fenestration of the pore domain.

Conclusions:

  • The study reveals multiple distinct drug-binding sites on Nav1.7, including intracellular, pore-associated fenestrations, and the selectivity filter.
  • These findings provide a detailed 3D structural map of drug interactions with Nav channels.
  • The identified binding sites offer crucial insights for the rational design of novel Nav channel-targeting therapeutics.