Download MendeleyStructural insights into the allosteric effects of the antiepileptic drug topiramate on the Ca V 2.3 channel.
Gao, Y., Bai, Q., Zhang, X.C., Zhao, Y.(2024) Biochem Biophys Res Commun 725: 150271-150271
- PubMed: 38901222
- DOI: https://doi.org/10.1016/j.bbrc.2024.150271
- Primary Citation of Related Structures:
7YG5 - PubMed Abstract:
The R-type voltage-gated calcium channel Ca V 2.3 is predominantly located in the presynapse and is implicated in distinct types of epileptic seizures. It has consequently emerged as a molecular target in seizure treatment. Here, we determined the cryo-EM structure of the Ca V 2.3-α2δ1-β1 complex in the topiramate-bound state at a 3.0 Å resolution. We provide a snapshot of the binding site of topiramate, a widely prescribed antiepileptic drug, on a voltage-gated ion channel. The binding site is located at an intracellular juxtamembrane hydrophilic cavity. Further structural analysis revealed that topiramate may allosterically facilitate channel inactivation. These findings provide fundamental insights into the mechanism underlying the inhibitory effect of topiramate on Ca V and Na V channels, elucidating a previously unseen modulator binding site and thus pointing toward a route for the development of new drugs.
Organizational Affiliation:
Key Laboratory of Biomacromolecules (CAS), National Laboratory of Biomacromolecules, CAS Center for Excellence in Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing, 100101, China; College of Life Sciences, University of Chinese Academy of Sciences, Beijing, 100049, China.
