Structure of the voltage-gated calcium channel Cav1.1 complex.

TitleStructure of the voltage-gated calcium channel Cav1.1 complex.
Publication TypeJournal Article
Year of Publication2015
AuthorsWu, J, Yan, Z, Li, Z, Yan, C, Lu, S, Dong, M, Yan, N
JournalScience
Volume350
Issue6267
Paginationaad2395
Date Published2015 Dec 18
ISSN1095-9203
KeywordsAmino Acid Sequence, Animals, Calcium Channels, L-Type, Cell Membrane, Cryoelectron Microscopy, Molecular Sequence Data, Muscle, Skeletal, Protein Multimerization, Protein Structure, Secondary, Protein Structure, Tertiary, Protein Subunits, Rabbits
Abstract

The voltage-gated calcium channel Ca(v)1.1 is engaged in the excitation-contraction coupling of skeletal muscles. The Ca(v)1.1 complex consists of the pore-forming subunit α1 and auxiliary subunits α2δ, β, and γ. We report the structure of the rabbit Ca(v)1.1 complex determined by single-particle cryo-electron microscopy. The four homologous repeats of the α1 subunit are arranged clockwise in the extracellular view. The γ subunit, whose structure resembles claudins, interacts with the voltage-sensing domain of repeat IV (VSD(IV)), whereas the cytosolic β subunit is located adjacent to VSD(II) of α1. The α2 subunit interacts with the extracellular loops of repeats I to III through its VWA and Cache1 domains. The structure reveals the architecture of a prototypical eukaryotic Ca(v) channel and provides a framework for understanding the function and disease mechanisms of Ca(v) and Na(v) channels.

DOI10.1126/science.aad2395
Alternate JournalScience
PubMed ID26680202
Grant List / / Howard Hughes Medical Institute / United States