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- PDB-6r7x: CryoEM structure of calcium-bound human TMEM16K / Anoctamin 10 in... -

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Basic information

Entry
Database: PDB / ID: 6r7x
TitleCryoEM structure of calcium-bound human TMEM16K / Anoctamin 10 in detergent (2mM Ca2+, closed form)
ComponentsAnoctamin-10
KeywordsLIPID TRANSPORT / MEMBRANE PROTEIN / CALCIUM ACTIVATION / TRANSPORT PROTEIN / Structural Genomics / Structural Genomics Consortium / SGC
Function / homology
Function and homology information


intracellularly calcium-gated chloride channel activity / calcium-activated cation channel activity / chloride channel activity / chloride transmembrane transport / Stimuli-sensing channels / monoatomic ion transmembrane transport / Induction of Cell-Cell Fusion / intracellular membrane-bounded organelle / membrane / plasma membrane
Similarity search - Function
Anoctamin / : / Calcium-activated chloride channel
Similarity search - Domain/homology
1,2-DIACYL-SN-GLYCERO-3-PHOSPHOCHOLINE / Anoctamin-10
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.47 Å
AuthorsPike, A.C.W. / Bushell, S.R. / Shintre, C.A. / Tessitore, A. / Baronina, A. / Chu, A. / Mukhopadhyay, S. / Shrestha, L. / Chalk, R. / Burgess-Brown, N.A. ...Pike, A.C.W. / Bushell, S.R. / Shintre, C.A. / Tessitore, A. / Baronina, A. / Chu, A. / Mukhopadhyay, S. / Shrestha, L. / Chalk, R. / Burgess-Brown, N.A. / Love, J. / Huiskonen, J.T. / Edwards, A.M. / Arrowsmith, C.H. / Bountra, C. / Carpenter, E.P. / Structural Genomics Consortium (SGC)
Funding support United Kingdom, 2items
OrganizationGrant numberCountry
Wellcome Trust106169/Z/14/Z United Kingdom
European Commission115766 United Kingdom
CitationJournal: Nat Commun / Year: 2019
Title: The structural basis of lipid scrambling and inactivation in the endoplasmic reticulum scramblase TMEM16K.
Authors: Simon R Bushell / Ashley C W Pike / Maria E Falzone / Nils J G Rorsman / Chau M Ta / Robin A Corey / Thomas D Newport / John C Christianson / Lara F Scofano / Chitra A Shintre / Annamaria ...Authors: Simon R Bushell / Ashley C W Pike / Maria E Falzone / Nils J G Rorsman / Chau M Ta / Robin A Corey / Thomas D Newport / John C Christianson / Lara F Scofano / Chitra A Shintre / Annamaria Tessitore / Amy Chu / Qinrui Wang / Leela Shrestha / Shubhashish M M Mukhopadhyay / James D Love / Nicola A Burgess-Brown / Rebecca Sitsapesan / Phillip J Stansfeld / Juha T Huiskonen / Paolo Tammaro / Alessio Accardi / Elisabeth P Carpenter /
Abstract: Membranes in cells have defined distributions of lipids in each leaflet, controlled by lipid scramblases and flip/floppases. However, for some intracellular membranes such as the endoplasmic ...Membranes in cells have defined distributions of lipids in each leaflet, controlled by lipid scramblases and flip/floppases. However, for some intracellular membranes such as the endoplasmic reticulum (ER) the scramblases have not been identified. Members of the TMEM16 family have either lipid scramblase or chloride channel activity. Although TMEM16K is widely distributed and associated with the neurological disorder autosomal recessive spinocerebellar ataxia type 10 (SCAR10), its location in cells, function and structure are largely uncharacterised. Here we show that TMEM16K is an ER-resident lipid scramblase with a requirement for short chain lipids and calcium for robust activity. Crystal structures of TMEM16K show a scramblase fold, with an open lipid transporting groove. Additional cryo-EM structures reveal extensive conformational changes from the cytoplasmic to the ER side of the membrane, giving a state with a closed lipid permeation pathway. Molecular dynamics simulations showed that the open-groove conformation is necessary for scramblase activity.
History
DepositionMar 29, 2019Deposition site: PDBE / Processing site: PDBE
Revision 1.0May 1, 2019Provider: repository / Type: Initial release
Revision 1.1Sep 11, 2019Group: Data collection / Database references / Category: citation / citation_author
Item: _citation.country / _citation.journal_abbrev ..._citation.country / _citation.journal_abbrev / _citation.journal_id_CSD / _citation.journal_id_ISSN / _citation.pdbx_database_id_DOI / _citation.title / _citation.year
Revision 1.2Sep 18, 2019Group: Data collection / Database references / Category: citation / citation_author
Item: _citation.journal_volume / _citation.page_first ..._citation.journal_volume / _citation.page_first / _citation.page_last / _citation.pdbx_database_id_PubMed / _citation.title
Revision 1.3Nov 20, 2019Group: Database references / Category: citation_author / Item: _citation_author.identifier_ORCID
Revision 1.4Dec 18, 2019Group: Other / Category: atom_sites
Item: _atom_sites.fract_transf_matrix[1][1] / _atom_sites.fract_transf_matrix[2][2] / _atom_sites.fract_transf_matrix[3][3]
Revision 1.5May 22, 2024Group: Data collection / Database references / Refinement description
Category: chem_comp_atom / chem_comp_bond ...chem_comp_atom / chem_comp_bond / database_2 / em_3d_fitting_list / pdbx_initial_refinement_model
Item: _database_2.pdbx_DOI / _database_2.pdbx_database_accession ..._database_2.pdbx_DOI / _database_2.pdbx_database_accession / _em_3d_fitting_list.accession_code / _em_3d_fitting_list.initial_refinement_model_id / _em_3d_fitting_list.source_name / _em_3d_fitting_list.type

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Structure visualization

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Assembly

Deposited unit
A: Anoctamin-10
B: Anoctamin-10
hetero molecules


Theoretical massNumber of molelcules
Total (without water)166,30530
Polymers154,5522
Non-polymers11,75328
Water00
1


  • Idetical with deposited unit
  • defined by author&software
  • Evidence: gel filtration
TypeNameSymmetry operationNumber
identity operation1_5551
Buried area17910 Å2
ΔGint-345 kcal/mol
Surface area58640 Å2
MethodPISA

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Components

#1: Protein Anoctamin-10 / Transmembrane protein 16K


Mass: 77276.016 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: ANO10, TMEM16K / Plasmid: PFB-CT10HF-LIC / Production host: Spodoptera frugiperda (fall armyworm) / References: UniProt: Q9NW15
#2: Chemical
ChemComp-CA / CALCIUM ION


Mass: 40.078 Da / Num. of mol.: 6 / Source method: obtained synthetically / Formula: Ca
#3: Chemical ChemComp-PC1 / 1,2-DIACYL-SN-GLYCERO-3-PHOSPHOCHOLINE / 3-SN-PHOSPHATIDYLCHOLINE


Mass: 790.145 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: C44H88NO8P / Comment: phospholipid*YM
#4: Chemical
ChemComp-UMQ / UNDECYL-MALTOSIDE / UNDECYL-BETA-D-MALTOPYRANOSIDE


Mass: 496.589 Da / Num. of mol.: 20 / Source method: obtained synthetically / Formula: C23H44O11 / Comment: detergent*YM

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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: Anoctamin 10 / Type: ORGANELLE OR CELLULAR COMPONENT / Entity ID: #1 / Source: RECOMBINANT
Molecular weightValue: 0.153 MDa / Experimental value: NO
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Spodoptera frugiperda (fall armyworm) / Plasmid: PFB-CT10HF-LIC
Buffer solutionpH: 7.5
Buffer component
IDConc.NameFormulaBuffer-ID
1150 mMsodium chlorideNaCl1
220 mMNa HEPESC8H18N2O4S1
30.045 % (w/v)Undecyl b-D MaltopyranosideC23H44O111
40.0045 % (w/v)cholesteryl hemisuccinateC31H50O41
52 mMcalcium chlorideCaCl21
SpecimenConc.: 3 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportGrid 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: 278 K / Details: blot for 3.5sec prior to plunging

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: FEI TITAN KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: SPOT SCAN
Electron lensMode: BRIGHT FIELD / Nominal defocus max: 3000 nm / Nominal defocus min: 1250 nm / Cs: 2.7 mm / C2 aperture diameter: 50 µm / Alignment procedure: COMA FREE
Specimen holderCryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER
Image recordingAverage exposure time: 8 sec. / Electron dose: 50.9 e/Å2 / Detector mode: COUNTING / Film or detector model: GATAN K2 SUMMIT (4k x 4k) / Num. of grids imaged: 1 / Num. of real images: 3421
EM imaging opticsEnergyfilter name: GIF Bioquantum / Energyfilter slit width: 20 eV
Image scansMovie frames/image: 20 / Used frames/image: 1-20

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Processing

SoftwareName: PHENIX / Version: 1.14_3260: / Classification: refinement
EM software
IDNameVersionCategory
1Gautomatch0.53particle selection
2EPUimage acquisition
4CTFFIND4.1.5CTF correction
7Cootmodel fitting
9RELION3initial Euler assignment
10RELION3final Euler assignment
11RELION3classification
12RELION33D reconstruction
13PHENIX1.14model refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Particle selectionNum. of particles selected: 300992
Details: Particles count after a single round of 2D classification
SymmetryPoint symmetry: C2 (2 fold cyclic)
3D reconstructionResolution: 3.47 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 70940 / Algorithm: FOURIER SPACE / Num. of class averages: 1 / Symmetry type: POINT
Atomic model buildingB value: 176 / Protocol: AB INITIO MODEL / Space: REAL / Target criteria: Correlation coef
Details: phenix.real_space_refine with NCS contraints, rotamer, cbeta and ramachandran restraints using postprocessed RELION3 map
Atomic model buildingPDB-ID: 5OC9

5oc9


Pdb chain-ID: A / Accession code: 5OC9 / Source name: PDB / Type: experimental model

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