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- PDB-6qpb: Cryo-EM structure of calcium-free mTMEM16F lipid scramblase in di... -

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Basic information

Entry
Database: PDB / ID: 6qpb
TitleCryo-EM structure of calcium-free mTMEM16F lipid scramblase in digitonin
ComponentsAnoctamin-6
KeywordsMEMBRANE PROTEIN / lipid scrambles / TMEM16
Function / homology
Function and homology information


calcium activated phospholipid scrambling / calcium activated galactosylceramide scrambling / calcium activated phosphatidylserine scrambling / calcium activated phosphatidylcholine scrambling / positive regulation of potassium ion export across plasma membrane / positive regulation of monoatomic ion transmembrane transport / purinergic nucleotide receptor signaling pathway / phospholipid scramblase activity / bone mineralization involved in bone maturation / cholinergic synapse ...calcium activated phospholipid scrambling / calcium activated galactosylceramide scrambling / calcium activated phosphatidylserine scrambling / calcium activated phosphatidylcholine scrambling / positive regulation of potassium ion export across plasma membrane / positive regulation of monoatomic ion transmembrane transport / purinergic nucleotide receptor signaling pathway / phospholipid scramblase activity / bone mineralization involved in bone maturation / cholinergic synapse / intracellularly calcium-gated chloride channel activity / plasma membrane phospholipid scrambling / negative regulation of cell volume / voltage-gated monoatomic ion channel activity / positive regulation of phagocytosis, engulfment / bleb assembly / Stimuli-sensing channels / calcium-activated cation channel activity / positive regulation of monocyte chemotaxis / chloride transport / dendritic cell chemotaxis / phospholipid translocation / regulation of postsynaptic membrane potential / chloride channel complex / positive regulation of bone mineralization / Neutrophil degranulation / chloride transmembrane transport / synaptic membrane / establishment of localization in cell / calcium ion transmembrane transport / blood coagulation / positive regulation of apoptotic process / protein homodimerization activity / metal ion binding / identical protein binding / plasma membrane
Similarity search - Function
Anoctamin, dimerisation domain / Anoctamin, dimerisation domain / Anoctamin / : / Calcium-activated chloride channel
Similarity search - Domain/homology
1,2-DIDECANOYL-SN-GLYCERO-3-PHOSPHOCHOLINE / Anoctamin-6
Similarity search - Component
Biological speciesMus musculus (house mouse)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.6 Å
AuthorsAlvadia, C. / Lim, N.K. / Clerico Mosina, V. / Oostergetel, G.T. / Dutzler, R. / Paulino, C.
Funding support Switzerland, Netherlands, 2items
OrganizationGrant numberCountry
European Research Council339116, AnoBest. Switzerland
Netherlands Organisation for Scientific Research740.018.016 Netherlands
CitationJournal: Elife / Year: 2019
Title: Cryo-EM structures and functional characterization of the murine lipid scramblase TMEM16F.
Authors: Carolina Alvadia / Novandy K Lim / Vanessa Clerico Mosina / Gert T Oostergetel / Raimund Dutzler / Cristina Paulino /
Abstract: The lipid scramblase TMEM16F initiates blood coagulation by catalyzing the exposure of phosphatidylserine in platelets. The protein is part of a family of membrane proteins, which encompasses calcium- ...The lipid scramblase TMEM16F initiates blood coagulation by catalyzing the exposure of phosphatidylserine in platelets. The protein is part of a family of membrane proteins, which encompasses calcium-activated channels for ions and lipids. Here, we reveal features of murine TMEM16F (mTMEM16F) that underlie its function as a lipid scramblase and an ion channel. The cryo-EM data of mTMEM16F in absence and presence of Ca define the ligand-free closed conformation of the protein and the structure of a Ca-bound intermediate. Both conformations resemble their counterparts of the scrambling-incompetent anion channel mTMEM16A, yet with distinct differences in the region of ion and lipid permeation. In conjunction with functional data, we demonstrate the relationship between ion conduction and lipid scrambling. Although activated by a common mechanism, both functions appear to be mediated by alternate protein conformations that are at equilibrium in the ligand-bound state.
History
DepositionFeb 13, 2019Deposition site: PDBE / Processing site: PDBE
Revision 1.0Mar 6, 2019Provider: repository / Type: Initial release
Revision 1.1Mar 20, 2019Group: Author supporting evidence / Data collection / Data processing
Category: database_PDB_rev / database_PDB_rev_record ...database_PDB_rev / database_PDB_rev_record / em_3d_reconstruction / em_admin / em_single_particle_entity / pdbx_database_proc
Item: _em_3d_reconstruction.resolution / _em_admin.last_update / _em_single_particle_entity.point_symmetry
Revision 1.2Nov 13, 2024Group: Data collection / Database references / Structure summary
Category: chem_comp_atom / chem_comp_bond ...chem_comp_atom / chem_comp_bond / database_2 / em_admin / pdbx_entry_details / pdbx_modification_feature
Item: _database_2.pdbx_DOI / _database_2.pdbx_database_accession / _em_admin.last_update

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Structure visualization

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Assembly

Deposited unit
A: Anoctamin-6
B: Anoctamin-6
hetero molecules


Theoretical massNumber of molelcules
Total (without water)213,8694
Polymers212,7352
Non-polymers1,1332
Water00
1


  • Idetical with deposited unit
  • defined by author&software
  • Evidence: gel filtration
TypeNameSymmetry operationNumber
identity operation1_5551
Buried area4560 Å2
ΔGint-14 kcal/mol
Surface area67330 Å2
MethodPISA

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Components

#1: Protein Anoctamin-6 / Small-conductance calcium-activated nonselective cation channel / SCAN channel / Transmembrane protein 16F


Mass: 106367.727 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Mus musculus (house mouse) / Gene: Ano6, Tmem16f / Cell (production host): HEK293T cells / Production host: Homo sapiens (human) / References: UniProt: Q6P9J9
#2: Chemical ChemComp-P1O / 1,2-DIDECANOYL-SN-GLYCERO-3-PHOSPHOCHOLINE


Mass: 566.728 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: C28H57NO8P / Comment: DDPC, phospholipid*YM
Has protein modificationY

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Experimental details

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Experiment

ExperimentMethod: ELECTRON MICROSCOPY
EM experimentAggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction

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Sample preparation

ComponentName: mTMEM16F / Type: COMPLEX / Entity ID: #1 / Source: RECOMBINANT
Molecular weightValue: 0.212 MDa / Experimental value: NO
Source (natural)Organism: Mus musculus (house mouse)
Source (recombinant)Organism: Homo sapiens (human) / Cell: HEK293T cells
Buffer solutionpH: 7.5
Details: 0.1% digitonin, 150 mM NaCl, 20 mM HEPES, pH 7.5 and 2 mM EGTA
SpecimenConc.: 3.3 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportDetails: at 5 mA / Grid material: GOLD / Grid mesh size: 300 divisions/in. / Grid type: Quantifoil R1.2/1.3
VitrificationInstrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 288 K

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Electron microscopy imaging

Experimental equipment
Model: Talos Arctica / Image courtesy: FEI Company
MicroscopyModel: FEI TALOS ARCTICA
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 200 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Nominal magnification: 49407 X / Calibrated magnification: 49407 X / Nominal defocus max: 3000 nm / Nominal defocus min: 300 nm / Calibrated defocus min: 300 nm / Calibrated defocus max: 3000 nm / Cs: 2.7 mm / C2 aperture diameter: 100 µm / Alignment procedure: COMA FREE
Specimen holderCryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER / Temperature (max): 105 K / Temperature (min): 90 K
Image recordingAverage exposure time: 9 sec. / Electron dose: 52 e/Å2 / Detector mode: COUNTING / Film or detector model: GATAN K2 SUMMIT (4k x 4k) / Num. of grids imaged: 7 / Num. of real images: 5657
EM imaging opticsEnergyfilter name: GIF Bioquantum / Energyfilter slit width: 20 eV
Image scansWidth: 3838 / Height: 3710 / Movie frames/image: 60 / Used frames/image: 1-60

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Processing

SoftwareName: PHENIX / Version: 1.14_3260: / Classification: refinement
EM software
IDNameVersionCategory
1RELION2.1bparticle selection
2EPU1.9.1image acquisition
4CTFFIND4.1.8CTF correction
7Cootmodel fitting
9RELION2.1binitial Euler assignment
10RELION2.1bfinal Euler assignment
12RELION2.1b3D reconstruction
13PHENIXmodel refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Particle selectionNum. of particles selected: 1314676
SymmetryPoint symmetry: C2 (2 fold cyclic)
3D reconstructionResolution: 3.6 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 194284 / Algorithm: BACK PROJECTION / Num. of class averages: 9 / Symmetry type: POINT
Atomic model buildingSpace: REAL

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