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Yorodumi- EMDB-25493: Human NALCN-FAM155A-UNC79-UNC80 channelosome with CaM bound, conf... -
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Open data
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Basic information
| Entry | Database: EMDB / ID: EMD-25493 | |||||||||
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| Title | Human NALCN-FAM155A-UNC79-UNC80 channelosome with CaM bound, conformation 2/2 | |||||||||
Map data | sharpened map used for model refinements | |||||||||
Sample |
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Keywords | ion channel / calmodulin / HEAT repeat protein / MEMBRANE PROTEIN | |||||||||
| Function / homology | Function and homology informationmonoatomic cation homeostasis / positive regulation of synaptic transmission, cholinergic / leak channel activity / regulation of resting membrane potential / cation channel complex / CaM pathway / Cam-PDE 1 activation / Sodium/Calcium exchangers / Calmodulin induced events / voltage-gated sodium channel activity ...monoatomic cation homeostasis / positive regulation of synaptic transmission, cholinergic / leak channel activity / regulation of resting membrane potential / cation channel complex / CaM pathway / Cam-PDE 1 activation / Sodium/Calcium exchangers / Calmodulin induced events / voltage-gated sodium channel activity / Reduction of cytosolic Ca++ levels / Activation of Ca-permeable Kainate Receptor / CREB1 phosphorylation through the activation of CaMKII/CaMKK/CaMKIV cascasde / Loss of phosphorylation of MECP2 at T308 / CREB1 phosphorylation through the activation of Adenylate Cyclase / negative regulation of high voltage-gated calcium channel activity / PKA activation / CaMK IV-mediated phosphorylation of CREB / Glycogen breakdown (glycogenolysis) / CLEC7A (Dectin-1) induces NFAT activation / Activation of RAC1 downstream of NMDARs / negative regulation of ryanodine-sensitive calcium-release channel activity / organelle localization by membrane tethering / mitochondrion-endoplasmic reticulum membrane tethering / autophagosome membrane docking / negative regulation of calcium ion export across plasma membrane / regulation of cardiac muscle cell action potential / presynaptic endocytosis / sodium channel activity / Synthesis of IP3 and IP4 in the cytosol / regulation of cell communication by electrical coupling involved in cardiac conduction / Phase 0 - rapid depolarisation / calcineurin-mediated signaling / Negative regulation of NMDA receptor-mediated neuronal transmission / Unblocking of NMDA receptors, glutamate binding and activation / RHO GTPases activate PAKs / calcium ion import across plasma membrane / Ion transport by P-type ATPases / Uptake and function of anthrax toxins / regulation of ryanodine-sensitive calcium-release channel activity / Long-term potentiation / protein phosphatase activator activity / Calcineurin activates NFAT / Regulation of MECP2 expression and activity / DARPP-32 events / monoatomic ion channel complex / Smooth Muscle Contraction / detection of calcium ion / regulation of cardiac muscle contraction / catalytic complex / RHO GTPases activate IQGAPs / regulation of cardiac muscle contraction by regulation of the release of sequestered calcium ion / monoatomic cation channel activity / calcium channel inhibitor activity / cellular response to interferon-beta / Activation of AMPK downstream of NMDARs / presynaptic cytosol / Protein methylation / regulation of release of sequestered calcium ion into cytosol by sarcoplasmic reticulum / eNOS activation / Ion homeostasis / titin binding / Tetrahydrobiopterin (BH4) synthesis, recycling, salvage and regulation / regulation of calcium-mediated signaling / sperm midpiece / voltage-gated potassium channel complex / potassium ion transmembrane transport / FCERI mediated Ca+2 mobilization / calcium channel complex / substantia nigra development / regulation of heart rate / FCGR3A-mediated IL10 synthesis / Ras activation upon Ca2+ influx through NMDA receptor / sodium ion transmembrane transport / Antigen activates B Cell Receptor (BCR) leading to generation of second messengers / calyx of Held / bioluminescence / adenylate cyclase activator activity / sarcomere / VEGFR2 mediated cell proliferation / protein serine/threonine kinase activator activity / positive regulation of synaptic transmission, GABAergic / VEGFR2 mediated vascular permeability / regulation of cytokinesis / spindle microtubule / generation of precursor metabolites and energy / positive regulation of receptor signaling pathway via JAK-STAT / Translocation of SLC2A4 (GLUT4) to the plasma membrane / calcium channel regulator activity / RAF activation / Transcriptional activation of mitochondrial biogenesis / response to calcium ion / calcium ion transmembrane transport / cellular response to type II interferon / G2/M transition of mitotic cell cycle / Stimuli-sensing channels / long-term synaptic potentiation / spindle pole / Signaling by RAF1 mutants / calcium-dependent protein binding Similarity search - Function | |||||||||
| Biological species | Homo sapiens (human) | |||||||||
| Method | single particle reconstruction / cryo EM / Resolution: 3.5 Å | |||||||||
Authors | Kschonsak M / Chua HC | |||||||||
| Funding support | 1 items
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Citation | Journal: Nature / Year: 2022Title: Structural architecture of the human NALCN channelosome. Authors: Marc Kschonsak / Han Chow Chua / Claudia Weidling / Nourdine Chakouri / Cameron L Noland / Katharina Schott / Timothy Chang / Christine Tam / Nidhi Patel / Christopher P Arthur / Alexander ...Authors: Marc Kschonsak / Han Chow Chua / Claudia Weidling / Nourdine Chakouri / Cameron L Noland / Katharina Schott / Timothy Chang / Christine Tam / Nidhi Patel / Christopher P Arthur / Alexander Leitner / Manu Ben-Johny / Claudio Ciferri / Stephan Alexander Pless / Jian Payandeh / ![]() Abstract: Depolarizing sodium (Na) leak currents carried by the NALCN channel regulate the resting membrane potential of many neurons to modulate respiration, circadian rhythm, locomotion and pain sensitivity. ...Depolarizing sodium (Na) leak currents carried by the NALCN channel regulate the resting membrane potential of many neurons to modulate respiration, circadian rhythm, locomotion and pain sensitivity. NALCN requires FAM155A, UNC79 and UNC80 to function, but the role of these auxiliary subunits is not understood. NALCN, UNC79 and UNC80 are essential in rodents, and mutations in human NALCN and UNC80 cause severe developmental and neurological disease. Here we determined the structure of the NALCN channelosome, an approximately 1-MDa complex, as fundamental aspects about the composition, assembly and gating of this channelosome remain obscure. UNC79 and UNC80 are massive HEAT-repeat proteins that form an intertwined anti-parallel superhelical assembly, which docks intracellularly onto the NALCN-FAM155A pore-forming subcomplex. Calmodulin copurifies bound to the carboxy-terminal domain of NALCN, identifying this region as a putative modulatory hub. Single-channel analyses uncovered a low open probability for the wild-type complex, highlighting the tightly closed S6 gate in the structure, and providing a basis to interpret the altered gating properties of disease-causing variants. Key constraints between the UNC79-UNC80 subcomplex and the NALCN DI-DII and DII-DIII linkers were identified, leading to a model of channelosome gating. Our results provide a structural blueprint to understand the physiology of the NALCN channelosome and a template for drug discovery to modulate the resting membrane potential. | |||||||||
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Structure visualization
| Movie |
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| Structure viewer | EM map: SurfView Molmil Jmol/JSmol |
| Supplemental images |
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Downloads & links
-EMDB archive
| Map data | emd_25493.map.gz | 226.8 MB | EMDB map data format | |
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| Header (meta data) | emd-25493-v30.xml emd-25493.xml | 29.9 KB 29.9 KB | Display Display | EMDB header |
| Images | emd_25493.png | 85 KB | ||
| Filedesc metadata | emd-25493.cif.gz | 12.3 KB | ||
| Others | emd_25493_additional_1.map.gz | 226.2 MB | ||
| Archive directory | http://ftp.pdbj.org/pub/emdb/structures/EMD-25493 ftp://ftp.pdbj.org/pub/emdb/structures/EMD-25493 | HTTPS FTP |
-Related structure data
| Related structure data | ![]() 7sx4MC ![]() 7sx3C M: atomic model generated by this map C: citing same article ( |
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| Similar structure data |
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Links
| EMDB pages | EMDB (EBI/PDBe) / EMDataResource |
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| Related items in Molecule of the Month |
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Map
| File | Download / File: emd_25493.map.gz / Format: CCP4 / Size: 244.1 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| Annotation | sharpened map used for model refinements | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Projections & slices | Image control
Images are generated by Spider. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Voxel size | X=Y=Z: 1.1732 Å | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Density |
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| Symmetry | Space group: 1 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Details | EMDB XML:
CCP4 map header:
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-Supplemental data
-Additional map: map (non-sharpened) of overall NALCN-FAM-UNC79-UNC80-CAM
| File | emd_25493_additional_1.map | ||||||||||||
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| Annotation | map (non-sharpened) of overall NALCN-FAM-UNC79-UNC80-CAM | ||||||||||||
| Projections & Slices |
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| Density Histograms |
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Sample components
+Entire : Pentameric complex of the leak channel NALCN with FAM155A, Calmod...
+Supramolecule #1: Pentameric complex of the leak channel NALCN with FAM155A, Calmod...
+Macromolecule #1: Sodium leak channel non-selective protein,Enhanced green fluoresc...
+Macromolecule #2: Transmembrane protein FAM155A
+Macromolecule #3: Calmodulin-1
+Macromolecule #4: UNC79,Protein unc-79 homolog
+Macromolecule #5: Protein unc-80 homolog
+Macromolecule #6: 2-acetamido-2-deoxy-beta-D-glucopyranose
+Macromolecule #7: (1S)-2-{[(2-AMINOETHOXY)(HYDROXY)PHOSPHORYL]OXY}-1-[(PALMITOYLOXY...
+Macromolecule #8: (1R)-2-{[{[(2S)-2,3-DIHYDROXYPROPYL]OXY}(HYDROXY)PHOSPHORYL]OXY}-...
+Macromolecule #9: CHOLESTEROL HEMISUCCINATE
-Experimental details
-Structure determination
| Method | cryo EM |
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Processing | single particle reconstruction |
| Aggregation state | particle |
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Sample preparation
| Concentration | 1.65 mg/mL | |||||||||
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| Buffer | pH: 7.5 Component:
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| Grid | Model: UltrAuFoil R0.6/1 / Material: GOLD / Mesh: 300 / Pretreatment - Type: PLASMA CLEANING / Pretreatment - Time: 30 sec. | |||||||||
| Vitrification | Cryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 277 K / Instrument: LEICA EM GP / Details: 3.5 sec blotting. | |||||||||
| Details | NALCN was reconstituted into lipid nanodiscs and mildly crosslinkned with 0.05% EM grade glutaraldehyde for 10 min at room temperature. Cross-linking was quenched with 9 mM Tris pH 7.5 |
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Electron microscopy
| Microscope | FEI TITAN KRIOS |
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| Specialist optics | Energy filter - Name: GIF Bioquantum / Energy filter - Slit width: 20 eV |
| Image recording | Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k) / Number grids imaged: 2 / Number real images: 26550 / Average exposure time: 3.0 sec. / Average electron dose: 64.009 e/Å2 |
| Electron beam | Acceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN |
| Electron optics | Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Cs: 2.7 mm / Nominal defocus max: 1.5 µm / Nominal defocus min: 0.5 µm / Nominal magnification: 105000 |
| Sample stage | Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER / Cooling holder cryogen: NITROGEN |
| Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
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About Yorodumi


Keywords
Homo sapiens (human)
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