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Structure, gating, and pharmacology of human CaV3.3 channel

Lingli He1,2,3, Zhuoya Yu1,2,3, Ze Geng4,5

  • 1National Laboratory of Biomacromolecules, CAS Center for Excellence in Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing, 100101, China.

Nature Communications
|April 20, 2022
PubMed

Insights

Structural insights into human T-type calcium channels (CaV3.3) reveal how diverse drugs bind to the same site. This research clarifies channel gating and drug interactions, aiding the development of targeted therapies for related diseases.

Area of Science:

  • Structural biology
  • Neuroscience
  • Pharmacology

Background:

  • Low-voltage-activated T-type calcium channels (CaV3.3) are crucial for cellular excitability and physiological events.
  • Dysfunction of CaV3.3 channels is linked to various diseases.

Purpose of the Study:

  • To determine the structures of the human CaV3.3 channel.
  • To investigate the binding mechanisms of different drugs (mibefradil, otilonium bromide, pimozide) within the CaV3.3 channel.
  • To elucidate the role of phospholipid molecules in drug binding and channel stabilization.

Main Methods:

  • Cryo-electron microscopy (Cryo-EM) to determine high-resolution structures.
  • Structural analysis of CaV3.3 in apo state and in complex with various drugs.
  • Investigation of drug-residue interactions and the influence of phospholipids.

Main Results:

  • Revealed a unique bent S6 helix in CaV3.3 critical for low-voltage activation.
  • Demonstrated that structurally distinct drugs bind to the same central cavity but via different interactions.
  • Identified phospholipid molecules shaping the binding pocket and stabilizing inhibitors.

Conclusions:

  • The determined structures provide mechanistic insights into CaV3.3 channel gating and activation.
  • Elucidated the distinct binding modes of various drugs within the CaV3.3 channel.
  • These findings pave the way for designing potent, subtype-specific drugs for treating CaV3.3-related disorders.

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