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Structural Basis of the Modulation of the Voltage‐Gated Calcium Ion Channel Ca v 1.1 by Dihydropyridine Compounds **
Author(s) -
Gao Shuai,
Yan Nieng
Publication year - 2021
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.202011793
Subject(s) - bay k8644 , chemistry , dihydropyridine , calcium channel , stereochemistry , nifedipine , enantiomer , agonist , chirality (physics) , voltage dependent calcium channel , biophysics , calcium , receptor , biochemistry , biology , nambu–jona lasinio model , chiral symmetry breaking , physics , organic chemistry , quantum mechanics , quark
1,4‐Dihydropyridines (DHP), the most commonly used antihypertensives, function by inhibiting the L‐type voltage‐gated Ca 2+ (Ca v ) channels. DHP compounds exhibit chirality‐specific antagonistic or agonistic effects. The structure of rabbit Ca v 1.1 bound to an achiral drug nifedipine reveals the general binding mode for DHP drugs, but the molecular basis for chiral specificity remained elusive. Herein, we report five cryo‐EM structures of nanodisc‐embedded Ca v 1.1 in the presence of the bestselling drug amlodipine, a DHP antagonist ( R )‐(+)‐Bay K8644, and a titration of its agonistic enantiomer ( S )‐(−)‐Bay K8644 at resolutions of 2.9–3.4 Å. The amlodipine‐bound structure reveals the molecular basis for the high efficacy of the drug. All structures with the addition of the Bay K8644 enantiomers exhibit similar inactivated conformations, suggesting that ( S )‐(−)‐Bay K8644, when acting as an agonist, is insufficient to lock the activated state of the channel for a prolonged duration.