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Yorodumi- PDB-8bc0: Cryo-EM structure of Ca2+-bound mTMEM16F F518A Q623A mutant in GD... -
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-Basic information
Entry | Database: PDB / ID: 8bc0 | ||||||
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Title | Cryo-EM structure of Ca2+-bound mTMEM16F F518A Q623A mutant in GDN open/closed | ||||||
Components | Anoctamin-6Calcium-dependent chloride channel | ||||||
Keywords | MEMBRANE PROTEIN / Lipid Scramblase / Ion Channel | ||||||
Function / homology | Function and homology information calcium activated phospholipid scrambling / calcium activated phosphatidylserine scrambling / calcium activated phosphatidylcholine scrambling / calcium activated galactosylceramide scrambling / phosphatidylserine exposure on blood platelet / positive regulation of potassium ion export across plasma membrane / purinergic nucleotide receptor signaling pathway / positive regulation of monoatomic ion transmembrane transport / phospholipid scramblase activity / activation of blood coagulation via clotting cascade ...calcium activated phospholipid scrambling / calcium activated phosphatidylserine scrambling / calcium activated phosphatidylcholine scrambling / calcium activated galactosylceramide scrambling / phosphatidylserine exposure on blood platelet / positive regulation of potassium ion export across plasma membrane / purinergic nucleotide receptor signaling pathway / positive regulation of monoatomic ion transmembrane transport / phospholipid scramblase activity / activation of blood coagulation via clotting cascade / negative regulation of cell volume / intracellularly calcium-gated chloride channel activity / bone mineralization involved in bone maturation / pore complex assembly / cholinergic synapse / plasma membrane phospholipid scrambling / bleb assembly / voltage-gated monoatomic ion channel activity / positive regulation of phagocytosis, engulfment / Stimuli-sensing channels / voltage-gated chloride channel activity / calcium-activated cation channel activity / positive regulation of endothelial cell apoptotic process / positive regulation of monocyte chemotaxis / dendritic cell chemotaxis / phospholipid translocation / chloride transport / chloride channel activity / chloride channel complex / monoatomic cation transport / sodium ion transmembrane transport / regulation of postsynaptic membrane potential / positive regulation of bone mineralization / chloride transmembrane transport / Neutrophil degranulation / synaptic membrane / establishment of localization in cell / calcium ion transmembrane transport / blood coagulation / positive regulation of apoptotic process / protein homodimerization activity / identical protein binding / metal ion binding / plasma membrane / cytosol Similarity search - Function | ||||||
Biological species | Mus musculus (house mouse) | ||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.09 Å | ||||||
Authors | Arndt, M. / Alvadia, C. / Straub, M. / Clerico-Mosina, V. / Paulino, C. / Dutzler, R. | ||||||
Funding support | European Union, 1items
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Citation | Journal: Nat Commun / Year: 2022 Title: Structural basis for the activation of the lipid scramblase TMEM16F. Authors: Melanie Arndt / Carolina Alvadia / Monique S Straub / Vanessa Clerico Mosina / Cristina Paulino / Raimund Dutzler / Abstract: TMEM16F, a member of the conserved TMEM16 family, plays a central role in the initiation of blood coagulation and the fusion of trophoblasts. The protein mediates passive ion and lipid transport in ...TMEM16F, a member of the conserved TMEM16 family, plays a central role in the initiation of blood coagulation and the fusion of trophoblasts. The protein mediates passive ion and lipid transport in response to an increase in intracellular Ca. However, the mechanism of how the protein facilitates both processes has remained elusive. Here we investigate the basis for TMEM16F activation. In a screen of residues lining the proposed site of conduction, we identify mutants with strongly activating phenotype. Structures of these mutants determined herein by cryo-electron microscopy show major rearrangements leading to the exposure of hydrophilic patches to the membrane, whose distortion facilitates lipid diffusion. The concomitant opening of a pore promotes ion conduction in the same protein conformation. Our work has revealed a mechanism that is distinct for this branch of the family and that will aid the development of a specific pharmacology for a promising drug target. | ||||||
History |
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-Structure visualization
Structure viewer | Molecule: MolmilJmol/JSmol |
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-Downloads & links
-Download
PDBx/mmCIF format | 8bc0.cif.gz | 280.6 KB | Display | PDBx/mmCIF format |
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PDB format | pdb8bc0.ent.gz | 223.3 KB | Display | PDB format |
PDBx/mmJSON format | 8bc0.json.gz | Tree view | PDBx/mmJSON format | |
Others | Other downloads |
-Validation report
Arichive directory | https://data.pdbj.org/pub/pdb/validation_reports/bc/8bc0 ftp://data.pdbj.org/pub/pdb/validation_reports/bc/8bc0 | HTTPS FTP |
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-Related structure data
Related structure data | 15958MC 8b8gC 8b8jC 8b8kC 8b8mC 8b8qC 8bc1C M: map data used to model this data C: citing same article (ref.) |
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Similar structure data | Similarity search - Function & homologyF&H Search |
-Links
-Assembly
Deposited unit |
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-Components
#1: Protein | Mass: 113330.484 Da / Num. of mol.: 2 / Mutation: F518A Q623A Source method: isolated from a genetically manipulated source Source: (gene. exp.) Mus musculus (house mouse) / Gene: Ano6, Tmem16f / Production host: Homo sapiens (human) / References: UniProt: Q6P9J9 #2: Chemical | ChemComp-CA / 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 |
-Sample preparation
Component | Name: mTMEM16F F518A Q623A mutant / Type: COMPLEX / Entity ID: #1 / Source: RECOMBINANT |
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Source (natural) | Organism: Mus musculus (house mouse) |
Source (recombinant) | Organism: Homo sapiens (human) |
Buffer solution | pH: 7.5 / Details: 20mM HEPES 150mM NaCl 2mM EGTA 0.03% GDN |
Specimen | Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES |
Specimen support | Grid material: GOLD / Grid mesh size: 200 divisions/in. / Grid type: Quantifoil R1.2/1.3 |
Vitrification | Instrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE-PROPANE / Humidity: 100 % / Chamber temperature: 277 K |
-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: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM |
Electron lens | Mode: BRIGHT FIELDBright-field microscopy / Nominal defocus max: 2400 nm / Nominal defocus min: 1000 nm / Cs: 2.7 mm / Alignment procedure: COMA FREE |
Specimen holder | Cryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER |
Image recording | Electron dose: 59.46 e/Å2 / Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k) |
-Processing
Software | Name: PHENIX / Version: 1.20.1_4487: / Classification: refinement | ||||||||||||||||||||||||
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EM software | Name: EPU / Category: image acquisition | ||||||||||||||||||||||||
CTF correction | Type: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||||||||||
Symmetry | Point symmetry: C1 (asymmetric) | ||||||||||||||||||||||||
3D reconstruction | Resolution: 3.09 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 208801 / Symmetry type: POINT | ||||||||||||||||||||||||
Atomic model building | B value: 69.7 / Space: REAL | ||||||||||||||||||||||||
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