6byo

From Proteopedia

Residue assignment correction to the voltage gated calcium Cav1.1 rabbit alpha 1 subunit PDB entries 3JBR & 5GJV

6byo, resolution 3.60Å

Structural highlights

6byo is a 1 chain structure with sequence from Oryctolagus cuniculus. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:	Electron Microscopy, Resolution 3.6Å
Experimental data:	Check to display Experimental Data
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

CAC1S_RABIT Voltage-sensitive calcium channels (VSCC) mediate the entry of calcium ions into excitable cells and are also involved in a variety of calcium-dependent processes, including muscle contraction, hormone or neurotransmitter release, gene expression, cell motility, cell division and cell death. The isoform alpha-1S gives rise to L-type calcium currents. Long-lasting (L-type) calcium channels belong to the 'high-voltage activated' (HVA) group. They are blocked by dihydropyridines (DHP), phenylalkylamines, benzothiazepines, and by omega-agatoxin-IIIA (omega-Aga-IIIA). They are however insensitive to omega-conotoxin-GVIA (omega-CTx-GVIA) and omega-agatoxin-IVA (omega-Aga-IVA). Calcium channels containing the alpha-1S subunit play an important role in excitation-contraction coupling in skeletal muscle.

Publication Abstract from PubMed

Voltage-gated ion channels (VGICs) are associated with hundreds of human diseases. To date, 3D structural models of human VGICs have not been reported. We developed a 3D structural integrity metric to rank the accuracy of all VGIC structures deposited in the PDB. The metric revealed inaccuracies in structural models built from recent single-particle, non-crystalline cryo-electron microscopy maps and enabled the building of highly accurate homology models of human Cav channel alpha1 subunits at atomic resolution. Human Cav Mendelian mutations mostly located to segments involved in the mechanism of voltage sensing and gating within the 3D structure, with multiple mutations targeting equivalent 3D structural locations despite eliciting distinct clinical phenotypes. The models also revealed that the architecture of the ion selectivity filter is highly conserved from bacteria to humans and between sodium and calcium VGICs.

An Improved Method for Modeling Voltage-Gated Ion Channels at Atomic Accuracy Applied to Human Cav Channels.,Martinez-Ortiz W, Cardozo TJ Cell Rep. 2018 May 1;23(5):1399-1408. doi: 10.1016/j.celrep.2018.04.024. PMID:29719253^[1]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

References

↑ Martinez-Ortiz W, Cardozo TJ. An Improved Method for Modeling Voltage-Gated Ion Channels at Atomic Accuracy Applied to Human Ca(v) Channels. Cell Rep. 2018 May 1;23(5):1399-1408. PMID:29719253 doi:10.1016/j.celrep.2018.04.024