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- PDB-8tai: TMEM16F, with Calcium and PIP2, no inhibitor, Cl2 -

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Basic information

Entry
Database: PDB / ID: 8tai
TitleTMEM16F, with Calcium and PIP2, no inhibitor, Cl2
ComponentsAnoctamin-6
KeywordsMEMBRANE PROTEIN / Calcium-activated ion channels / lipid scramblases
Function / homology
Function and homology information


calcium activated phospholipid scrambling / calcium activated phosphatidylserine scrambling / calcium activated phosphatidylcholine scrambling / calcium activated galactosylceramide scrambling / positive regulation of potassium ion export across plasma membrane / purinergic nucleotide receptor signaling pathway / positive regulation of monoatomic ion transmembrane transport / phospholipid scramblase activity / bone mineralization involved in bone maturation / intracellularly calcium-gated chloride channel activity ...calcium activated phospholipid scrambling / calcium activated phosphatidylserine scrambling / calcium activated phosphatidylcholine scrambling / calcium activated galactosylceramide scrambling / positive regulation of potassium ion export across plasma membrane / purinergic nucleotide receptor signaling pathway / positive regulation of monoatomic ion transmembrane transport / phospholipid scramblase activity / bone mineralization involved in bone maturation / intracellularly calcium-gated chloride channel activity / negative regulation of cell volume / cholinergic synapse / voltage-gated monoatomic ion channel activity / plasma membrane phospholipid scrambling / positive regulation of phagocytosis, engulfment / bleb assembly / Stimuli-sensing channels / calcium-activated cation channel activity / positive regulation of monocyte chemotaxis / dendritic cell chemotaxis / chloride transport / phospholipid translocation / chloride channel activity / chloride channel complex / regulation of postsynaptic membrane potential / positive regulation of bone mineralization / chloride transmembrane transport / Neutrophil degranulation / establishment of localization in cell / synaptic membrane / calcium ion transmembrane transport / blood coagulation / positive regulation of apoptotic process / protein homodimerization activity / identical protein binding / metal ion binding / plasma membrane
Similarity search - Function
Anoctamin, dimerisation domain / Anoctamin, dimerisation domain / Anoctamin / : / Calcium-activated chloride channel
Similarity search - Domain/homology
Biological speciesMus musculus (house mouse)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.1 Å
AuthorsWu, H. / Feng, S. / Cheng, Y.
Funding support United States, 1items
OrganizationGrant numberCountry
Howard Hughes Medical Institute (HHMI) United States
CitationJournal: Nat Commun / Year: 2023
Title: Identification of a drug binding pocket in TMEM16F calcium-activated ion channel and lipid scramblase.
Authors: Shengjie Feng / Cristina Puchades / Juyeon Ko / Hao Wu / Yifei Chen / Eric E Figueroa / Shuo Gu / Tina W Han / Brandon Ho / Tong Cheng / Junrui Li / Brian Shoichet / Yuh Nung Jan / Yifan Cheng / Lily Yeh Jan /
Abstract: The dual functions of TMEM16F as Ca-activated ion channel and lipid scramblase raise intriguing questions regarding their molecular basis. Intrigued by the ability of the FDA-approved drug ...The dual functions of TMEM16F as Ca-activated ion channel and lipid scramblase raise intriguing questions regarding their molecular basis. Intrigued by the ability of the FDA-approved drug niclosamide to inhibit TMEM16F-dependent syncytia formation induced by SARS-CoV-2, we examined cryo-EM structures of TMEM16F with or without bound niclosamide or 1PBC, a known blocker of TMEM16A Ca-activated Cl channel. Here, we report evidence for a lipid scrambling pathway along a groove harboring a lipid trail outside the ion permeation pore. This groove contains the binding pocket for niclosamide and 1PBC. Mutations of two residues in this groove specifically affect lipid scrambling. Whereas mutations of some residues in the binding pocket of niclosamide and 1PBC reduce their inhibition of TMEM16F-mediated Ca influx and PS exposure, other mutations preferentially affect the ability of niclosamide and/or 1PBC to inhibit TMEM16F-mediated PS exposure, providing further support for separate pathways for ion permeation and lipid scrambling.
History
DepositionJun 27, 2023Deposition site: RCSB / Processing site: RCSB
Revision 1.0Sep 6, 2023Provider: repository / Type: Initial release

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

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


Theoretical massNumber of molelcules
Total (without water)193,29711
Polymers191,8502
Non-polymers1,4479
Water00
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: electron microscopy, not applicable
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

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


Mass: 95924.906 Da / Num. of mol.: 2
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: Sugar
ChemComp-NAG / 2-acetamido-2-deoxy-beta-D-glucopyranose / N-acetyl-beta-D-glucosamine / 2-acetamido-2-deoxy-beta-D-glucose / 2-acetamido-2-deoxy-D-glucose / 2-acetamido-2-deoxy-glucose / N-ACETYL-D-GLUCOSAMINE


Type: D-saccharide, beta linking / Mass: 221.208 Da / Num. of mol.: 6 / Source method: obtained synthetically / Formula: C8H15NO6 / Feature type: SUBJECT OF INVESTIGATION
IdentifierTypeProgram
DGlcpNAcbCONDENSED IUPAC CARBOHYDRATE SYMBOLGMML 1.0
N-acetyl-b-D-glucopyranosamineCOMMON NAMEGMML 1.0
b-D-GlcpNAcIUPAC CARBOHYDRATE SYMBOLPDB-CARE 1.0
GlcNAcSNFG CARBOHYDRATE SYMBOLGMML 1.0
#3: Chemical ChemComp-CA / CALCIUM ION


Mass: 40.078 Da / Num. of mol.: 3 / Source method: obtained synthetically / Formula: Ca
Has ligand of interestY

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Experimental details

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Experiment

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

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Sample preparation

ComponentName: 16F / Type: COMPLEX / Entity ID: #1 / Source: RECOMBINANT
Source (natural)Organism: Mus musculus (house mouse)
Source (recombinant)Organism: Homo sapiens (human)
Buffer solutionpH: 7.5
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationCryogen name: ETHANE-PROPANE

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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: FLOOD BEAM
Electron lensMode: DIFFRACTION / Nominal defocus max: 18000 nm / Nominal defocus min: 10000 nm
Image recordingElectron dose: 45.8 e/Å2 / Film or detector model: GATAN K3 (6k x 4k)

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Processing

CTF correctionType: NONE
3D reconstructionResolution: 3.1 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 539866 / Symmetry type: POINT
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.00312344
ELECTRON MICROSCOPYf_angle_d0.52716760
ELECTRON MICROSCOPYf_dihedral_angle_d5.6071674
ELECTRON MICROSCOPYf_chiral_restr0.0571858
ELECTRON MICROSCOPYf_plane_restr0.0042071

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