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Open data
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Basic information
Entry | Database: PDB / ID: 7vnr | ||||||
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Title | Structure of human KCNQ4-ML213 complex in digitonin | ||||||
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![]() | MEMBRANE PROTEIN / KCNQ4 / ML213 / cryo-EM / digitonin | ||||||
Function / homology | ![]() transporter inhibitor activity / Voltage gated Potassium channels / establishment of protein localization to mitochondrial membrane / type 3 metabotropic glutamate receptor binding / Sensory processing of sound by outer hair cells of the cochlea / Sensory processing of sound by inner hair cells of the cochlea / inner ear morphogenesis / negative regulation of high voltage-gated calcium channel activity / response to corticosterone / negative regulation of calcium ion export across plasma membrane ...transporter inhibitor activity / Voltage gated Potassium channels / establishment of protein localization to mitochondrial membrane / type 3 metabotropic glutamate receptor binding / Sensory processing of sound by outer hair cells of the cochlea / Sensory processing of sound by inner hair cells of the cochlea / inner ear morphogenesis / negative regulation of high voltage-gated calcium channel activity / response to corticosterone / negative regulation of calcium ion export across plasma membrane / regulation of cardiac muscle cell action potential / presynaptic endocytosis / nitric-oxide synthase binding / regulation of cell communication by electrical coupling involved in cardiac conduction / calcineurin-mediated signaling / regulation of synaptic vesicle exocytosis / protein phosphatase activator activity / adenylate cyclase binding / voltage-gated potassium channel activity / catalytic complex / carbohydrate transmembrane transporter activity / regulation of synaptic vesicle endocytosis / maltose binding / detection of calcium ion / maltose transport / potassium channel activity / regulation of cardiac muscle contraction / maltodextrin transmembrane transport / postsynaptic cytosol / regulation of cardiac muscle contraction by regulation of the release of sequestered calcium ion / presynaptic cytosol / phosphatidylinositol 3-kinase binding / ATP-binding cassette (ABC) transporter complex, substrate-binding subunit-containing / regulation of release of sequestered calcium ion into cytosol by sarcoplasmic reticulum / titin binding / sperm midpiece / voltage-gated potassium channel complex / regulation of calcium-mediated signaling / potassium ion transmembrane transport / calcium channel complex / substantia nigra development / response to amphetamine / calcium channel regulator activity / regulation of heart rate / nitric-oxide synthase regulator activity / basal plasma membrane / calyx of Held / adenylate cyclase activator activity / sarcomere / regulation of cytokinesis / protein serine/threonine kinase activator activity / spindle microtubule / sensory perception of sound / mitochondrial membrane / potassium ion transport / Schaffer collateral - CA1 synapse / long-term synaptic potentiation / response to calcium ion / spindle pole / calcium-dependent protein binding / G2/M transition of mitotic cell cycle / synaptic vesicle membrane / myelin sheath / outer membrane-bounded periplasmic space / growth cone / vesicle / transmembrane transporter binding / G protein-coupled receptor signaling pathway / protein domain specific binding / calcium ion binding / centrosome / protein kinase binding / protein-containing complex / nucleus / plasma membrane / cytoplasm Similarity search - Function | ||||||
Biological species | ![]() ![]() ![]() | ||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.8 Å | ||||||
![]() | Xu, F. / Zheng, Y. | ||||||
Funding support | ![]()
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![]() | ![]() Title: Structural insights into the lipid and ligand regulation of a human neuronal KCNQ channel. Authors: You Zheng / Heng Liu / Yuxin Chen / Shaowei Dong / Fang Wang / Shengyi Wang / Geng-Lin Li / Yilai Shu / Fei Xu / ![]() Abstract: The KCNQ family (KCNQ1-KCNQ5) of voltage-gated potassium channels plays critical roles in many physiological and pathological processes. It is known that the channel opening of all KCNQs relies on ...The KCNQ family (KCNQ1-KCNQ5) of voltage-gated potassium channels plays critical roles in many physiological and pathological processes. It is known that the channel opening of all KCNQs relies on the signaling lipid molecule phosphatidylinositol 4,5-bisphosphate (PIP2). However, the molecular mechanism of PIP2 in modulating the opening of the four neuronal KCNQ channels (KCNQ2-KCNQ5), which are essential for regulating neuronal excitability, remains largely elusive. Here, we report the cryoelectron microscopy (cryo-EM) structures of human KCNQ4 determined in complex with the activator ML213 in the absence or presence of PIP2. Two PIP2 molecules are identified in the open-state structure of KCNQ4, which act as a bridge to couple the voltage-sensing domain (VSD) and pore domain (PD) of KCNQ4 leading to the channel opening. Our findings reveal the binding sites and activation mechanisms of ML213 and PIP2 for neuronal KCNQ channels, providing a framework for therapeutic intervention targeting on these important channels. | ||||||
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Structure visualization
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Structure viewer | Molecule: ![]() ![]() |
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PDBx/mmCIF format | ![]() | 409.5 KB | Display | ![]() |
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-Validation report
Summary document | ![]() | 1.2 MB | Display | ![]() |
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Full document | ![]() | 1.2 MB | Display | |
Data in XML | ![]() | 57.1 KB | Display | |
Data in CIF | ![]() | 80.1 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 32046MC ![]() 7vnpC ![]() 7vnqC M: map data used to model this data C: citing same article ( |
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Similar structure data |
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Assembly
Deposited unit | ![]()
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Components
#1: Protein | Mass: 116541.383 Da / Num. of mol.: 4 Source method: isolated from a genetically manipulated source Details: The fusion protein of Potassium voltage-gated channel subfamily KQT member 4, linker, and Maltodextrin-binding protein Source: (gene. exp.) ![]() ![]() ![]() Gene: KCNQ4, ECBD_4002 / Strain: B / BL21-DE3 / Production host: ![]() #2: Protein | Mass: 16852.545 Da / Num. of mol.: 4 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() #3: Chemical | ChemComp-7YV / ( #4: Chemical | Has ligand of interest | Y | |
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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: KCNQ4-ML213 complex in digitonin / Type: COMPLEX / Entity ID: #1-#2 / Source: RECOMBINANT |
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Source (natural) | Organism: ![]() |
Source (recombinant) | Organism: ![]() |
Buffer solution | pH: 7.4 |
Specimen | Conc.: 4.8 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES |
Specimen support | Grid material: GOLD / Grid mesh size: 300 divisions/in. / Grid type: Quantifoil R1.2/1.3 |
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: DARK FIELD |
Image recording | Electron dose: 16.8 e/Å2 / Film or detector model: GATAN K3 (6k x 4k) |
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Processing
CTF correction | Type: PHASE FLIPPING AND AMPLITUDE CORRECTION |
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3D reconstruction | Resolution: 2.8 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 126225 / Symmetry type: POINT |