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Structural basis for CaVα2δ:gabapentin binding.

Zhou Chen1, Abhisek Mondal1, Daniel L Minor2,3,4,5,6

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Nature Structural & Molecular Biology
|March 27, 2023
PubMed
Summary
This summary is machine-generated.

Gabapentin binds to a specific pocket in the CaVα2δ-1 subunit of calcium channels, explaining its therapeutic effects. Variations in CaVα2δ isoforms determine drug selectivity for pain and anxiety treatments.

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Area of Science:

  • Pharmacology
  • Neuroscience
  • Structural Biology

Background:

  • Gabapentinoids target CaVα2δ-1 and CaVα2δ-2 subunits of voltage-gated calcium channels.
  • These channels are crucial for neuronal excitability and neurotransmitter release.

Purpose of the Study:

  • To elucidate the structural basis of gabapentin binding to CaVα2δ-1.
  • To understand the molecular determinants of gabapentinoid selectivity across CaVα2δ isoforms.

Main Methods:

  • Cryo-electron microscopy (cryo-EM) to determine the structure of the CaV1.2/CaVβ3/CaVα2δ-1 channel complex.
  • Structural analysis of the gabapentin binding site within the CaVα2δ-1 dCache1 domain.

Main Results:

  • The cryo-EM structure reveals a well-defined binding pocket within the CaVα2δ-1 dCache1 domain that fully accommodates gabapentin.
  • Sequence variations among CaVα2δ isoforms were identified that correlate with gabapentin binding selectivity for CaVα2δ-1 and CaVα2δ-2.

Conclusions:

  • The structural data provide a molecular explanation for gabapentin's interaction with the CaVα2δ-1 subunit.
  • Understanding these isoform-specific interactions can inform the development of more selective gabapentinoid therapeutics for pain and anxiety.