Quantum mechanics

Quark

Dihydropyridine

Voltage-dependent calcium channel

Biology

Enantiomer

Calcium

Modulation (music)

Receptor

Agonist

Nambu–Jona-Lasinio model

Calcium channel

Biochemistry

Acoustics

Voltage-gated ion channel

Stereochemistry

Physics

Organic chemistry

Nifedipine

Pharmacology

Chirality (physics)

Antagonist

Chemistry

Bay K8644

Chiral symmetry breaking

Biophysics

Ion channel

Angewandte Chemie International Edition

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.

Structural Basis of the Modulation of the Voltage‐Gated Calcium Ion Channel Ca<sub>v</sub>1.1 by Dihydropyridine Compounds**

Structural Basis of the Modulation of the Voltage‐Gated Calcium Ion Channel Cav1.1 by Dihydropyridine Compounds**

Structural Basis of the Modulation of the Voltage‐Gated Calcium Ion Channel Ca_v1.1 by Dihydropyridine Compounds**