6jp8
Rabbit Cav1.1-Bay K8644 Complex
Structural highlights
FunctionCCG1_RABIT This protein is a subunit of the dihydropyridine (DHP) sensitive calcium channel. Plays a role in excitation-contraction coupling. The skeletal muscle DHP-sensitive Ca(2+) channel may function only as a multiple subunit complex. Publication Abstract from PubMedThe L-type voltage-gated Ca(2+) (Cav) channels are modulated by various compounds exemplified by 1,4-dihydropyridines (DHP), benzothiazepines (BTZ), and phenylalkylamines (PAA), many of which have been used for characterizing channel properties and for treatment of hypertension and other disorders. Here, we report the cryoelectron microscopy (cryo-EM) structures of Cav1.1 in complex with archetypal antagonistic drugs, nifedipine, diltiazem, and verapamil, at resolutions of 2.9 A, 3.0 A, and 2.7 A, respectively, and with a DHP agonist Bay K 8644 at 2.8 A. Diltiazem and verapamil traverse the central cavity of the pore domain, directly blocking ion permeation. Although nifedipine and Bay K 8644 occupy the same fenestration site at the interface of repeats III and IV, the coordination details support previous functional observations that Bay K 8644 is less favored in the inactivated state. These structures elucidate the modes of action of different Cav ligands and establish a framework for structure-guided drug discovery. Molecular Basis for Ligand Modulation of a Mammalian Voltage-Gated Ca(2+) Channel.,Zhao Y, Huang G, Wu J, Wu Q, Gao S, Yan Z, Lei J, Yan N Cell. 2019 May 30;177(6):1495-1506.e12. doi: 10.1016/j.cell.2019.04.043. PMID:31150622[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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