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- PDB-6cno: Cryo-EM structure of the human SK4/calmodulin channel complex in ... -
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Basic information
Entry | Database: PDB / ID: 6cno | |||||||||
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Title | Cryo-EM structure of the human SK4/calmodulin channel complex in the Ca2+ bound state II | |||||||||
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![]() | MEMBRANE PROTEIN / ion channel / neuroscience / calmodulin | |||||||||
Function / homology | ![]() intermediate conductance calcium-activated potassium channel activity / small conductance calcium-activated potassium channel activity / saliva secretion / Ca2+ activated K+ channels / calcium-activated potassium channel activity / stabilization of membrane potential / positive regulation of potassium ion transmembrane transport / cell volume homeostasis / CaM pathway / Cam-PDE 1 activation ...intermediate conductance calcium-activated potassium channel activity / small conductance calcium-activated potassium channel activity / saliva secretion / Ca2+ activated K+ channels / calcium-activated potassium channel activity / stabilization of membrane potential / positive regulation of potassium ion transmembrane transport / cell volume homeostasis / CaM pathway / Cam-PDE 1 activation / Sodium/Calcium exchangers / phospholipid translocation / Calmodulin induced events / Reduction of cytosolic Ca++ levels / CREB1 phosphorylation through the activation of CaMKII/CaMKK/CaMKIV cascasde / Activation of Ca-permeable Kainate Receptor / Loss of phosphorylation of MECP2 at T308 / CREB1 phosphorylation through the activation of Adenylate Cyclase / PKA activation / negative regulation of high voltage-gated calcium channel activity / CaMK IV-mediated phosphorylation of CREB / Glycogen breakdown (glycogenolysis) / positive regulation of cyclic-nucleotide phosphodiesterase activity / organelle localization by membrane tethering / negative regulation of calcium ion export across plasma membrane / CLEC7A (Dectin-1) induces NFAT activation / regulation of cardiac muscle cell action potential / mitochondrion-endoplasmic reticulum membrane tethering / autophagosome membrane docking / immune system process / Activation of RAC1 downstream of NMDARs / positive regulation of ryanodine-sensitive calcium-release channel activity / positive regulation of T cell receptor signaling pathway / regulation of cell communication by electrical coupling involved in cardiac conduction / Negative regulation of NMDA receptor-mediated neuronal transmission / negative regulation of peptidyl-threonine phosphorylation / Synthesis of IP3 and IP4 in the cytosol / Unblocking of NMDA receptors, glutamate binding and activation / Phase 0 - rapid depolarisation / potassium channel activity / protein phosphatase activator activity / RHO GTPases activate PAKs / positive regulation of phosphoprotein phosphatase activity / Ion transport by P-type ATPases / Long-term potentiation / Uptake and function of anthrax toxins / Calcineurin activates NFAT / Regulation of MECP2 expression and activity / catalytic complex / DARPP-32 events / detection of calcium ion / regulation of cardiac muscle contraction / negative regulation of ryanodine-sensitive calcium-release channel activity / Smooth Muscle Contraction / RHO GTPases activate IQGAPs / calcium channel inhibitor activity / cellular response to interferon-beta / regulation of cardiac muscle contraction by regulation of the release of sequestered calcium ion / Protein methylation / eNOS activation / Activation of AMPK downstream of NMDARs / regulation of release of sequestered calcium ion into cytosol by sarcoplasmic reticulum / Tetrahydrobiopterin (BH4) synthesis, recycling, salvage and regulation / positive regulation of protein dephosphorylation / Ion homeostasis / regulation of calcium-mediated signaling / regulation of ryanodine-sensitive calcium-release channel activity / potassium ion transmembrane transport / titin binding / positive regulation of protein autophosphorylation / voltage-gated potassium channel complex / sperm midpiece / calcium channel complex / substantia nigra development / adenylate cyclase activator activity / Ras activation upon Ca2+ influx through NMDA receptor / regulation of heart rate / sarcomere / protein serine/threonine kinase activator activity / FCERI mediated Ca+2 mobilization / FCGR3A-mediated IL10 synthesis / VEGFR2 mediated vascular permeability / positive regulation of peptidyl-threonine phosphorylation / regulation of cytokinesis / Antigen activates B Cell Receptor (BCR) leading to generation of second messengers / VEGFR2 mediated cell proliferation / establishment of localization in cell / Translocation of SLC2A4 (GLUT4) to the plasma membrane / positive regulation of protein secretion / positive regulation of receptor signaling pathway via JAK-STAT / RAF activation / potassium ion transport / Transcriptional activation of mitochondrial biogenesis / positive regulation of protein serine/threonine kinase activity / spindle microtubule / Stimuli-sensing channels / defense response / cellular response to type II interferon / spindle pole / response to calcium ion Similarity search - Function | |||||||||
Biological species | ![]() | |||||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 4.7 Å | |||||||||
![]() | Lee, C.H. / MacKinnon, R. | |||||||||
Funding support | ![]()
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![]() | ![]() Title: Activation mechanism of a human SK-calmodulin channel complex elucidated by cryo-EM structures. Authors: Chia-Hsueh Lee / Roderick MacKinnon / ![]() Abstract: Small-conductance Ca-activated K (SK) channels mediate neuron excitability and are associated with synaptic transmission and plasticity. They also regulate immune responses and the size of blood ...Small-conductance Ca-activated K (SK) channels mediate neuron excitability and are associated with synaptic transmission and plasticity. They also regulate immune responses and the size of blood cells. Activation of SK channels requires calmodulin (CaM), but how CaM binds and opens SK channels has been unclear. Here we report cryo-electron microscopy (cryo-EM) structures of a human SK4-CaM channel complex in closed and activated states at 3.4- and 3.5-angstrom resolution, respectively. Four CaM molecules bind to one channel tetramer. Each lobe of CaM serves a distinct function: The C-lobe binds to the channel constitutively, whereas the N-lobe interacts with the S4-S5 linker in a Ca-dependent manner. The S4-S5 linker, which contains two distinct helices, undergoes conformational changes upon CaM binding to open the channel pore. These structures reveal the gating mechanism of SK channels and provide a basis for understanding SK channel pharmacology. | |||||||||
History |
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Structure visualization
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Structure viewer | Molecule: ![]() ![]() |
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Downloads & links
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PDBx/mmCIF format | ![]() | 348.9 KB | Display | ![]() |
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PDB format | ![]() | 283.2 KB | Display | ![]() |
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-Validation report
Summary document | ![]() | 959.7 KB | Display | ![]() |
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Full document | ![]() | 973 KB | Display | |
Data in XML | ![]() | 54.2 KB | Display | |
Data in CIF | ![]() | 75.5 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 7539MC ![]() 7537C ![]() 7538C ![]() 6cnmC ![]() 6cnnC M: map data used to model this data C: citing same article ( |
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Similar structure data |
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Links
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Assembly
Deposited unit | ![]()
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Components
#1: Protein | Mass: 47758.496 Da / Num. of mol.: 4 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() #2: Protein | Mass: 16852.545 Da / Num. of mol.: 4 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() #3: Chemical | ChemComp-CA / |
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-Experimental details
-Experiment
Experiment | Method: ELECTRON MICROSCOPY |
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EM experiment | Aggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction |
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Sample preparation
Component | Name: human SK4/calmodulin channel complex / Type: COMPLEX / Entity ID: #1-#2 / Source: RECOMBINANT |
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Source (natural) | Organism: ![]() |
Source (recombinant) | Organism: ![]() |
Buffer solution | pH: 8 |
Specimen | Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES |
Vitrification | Cryogen name: ETHANE |
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Electron microscopy imaging
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
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Microscopy | Model: FEI TITAN KRIOS |
Electron gun | Electron source: ![]() |
Electron lens | Mode: BRIGHT FIELD |
Image recording | Electron dose: 75 e/Å2 / Film or detector model: GATAN K2 SUMMIT (4k x 4k) |
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Processing
Software | Name: PHENIX / Version: 1.12_2829: / Classification: refinement | ||||||||||||||||||||||||
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CTF correction | Type: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||||||||||
Symmetry | Point symmetry: C4 (4 fold cyclic) | ||||||||||||||||||||||||
3D reconstruction | Resolution: 4.7 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 52056 / Symmetry type: POINT | ||||||||||||||||||||||||
Refinement | Highest resolution: 4.7 Å | ||||||||||||||||||||||||
Refine LS restraints |
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