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- PDB-7zk3: Structure of 1PBC- and calcium-bound mTMEM16A(ac) chloride channe... -
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Open data
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Basic information
Entry | Database: PDB / ID: 7zk3 | |||||||||
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Title | Structure of 1PBC- and calcium-bound mTMEM16A(ac) chloride channel at 2.85 A resolution | |||||||||
![]() | Anoctamin-1 | |||||||||
![]() | MEMBRANE PROTEIN / calcium-activated chloride channel / anoctamin-1 | |||||||||
Function / homology | ![]() glial cell projection elongation / trachea development / iodide transmembrane transporter activity / iodide transport / intracellularly calcium-gated chloride channel activity / mucus secretion / cellular response to peptide / voltage-gated chloride channel activity / Stimuli-sensing channels / chloride transport ...glial cell projection elongation / trachea development / iodide transmembrane transporter activity / iodide transport / intracellularly calcium-gated chloride channel activity / mucus secretion / cellular response to peptide / voltage-gated chloride channel activity / Stimuli-sensing channels / chloride transport / chloride channel activity / positive regulation of insulin secretion involved in cellular response to glucose stimulus / detection of temperature stimulus involved in sensory perception of pain / chloride channel complex / chloride transmembrane transport / regulation of membrane potential / establishment of localization in cell / cell projection / presynaptic membrane / phospholipase C-activating G protein-coupled receptor signaling pathway / cellular response to heat / apical plasma membrane / external side of plasma membrane / signaling receptor binding / glutamatergic synapse / protein homodimerization activity / identical protein binding / metal ion binding / plasma membrane Similarity search - Function | |||||||||
Biological species | ![]() ![]() | |||||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.85 Å | |||||||||
![]() | Lam, A.K.M. / Rutz, S. / Dutzler, R. | |||||||||
Funding support | European Union, ![]()
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![]() | ![]() Title: Inhibition mechanism of the chloride channel TMEM16A by the pore blocker 1PBC. Authors: Andy K M Lam / Sonja Rutz / Raimund Dutzler / ![]() Abstract: TMEM16A, a calcium-activated chloride channel involved in multiple cellular processes, is a proposed target for diseases such as hypertension, asthma, and cystic fibrosis. Despite these therapeutic ...TMEM16A, a calcium-activated chloride channel involved in multiple cellular processes, is a proposed target for diseases such as hypertension, asthma, and cystic fibrosis. Despite these therapeutic promises, its pharmacology remains poorly understood. Here, we present a cryo-EM structure of TMEM16A in complex with the channel blocker 1PBC and a detailed functional analysis of its inhibition mechanism. A pocket located external to the neck region of the hourglass-shaped pore is responsible for open-channel block by 1PBC and presumably also by its structural analogs. The binding of the blocker stabilizes an open-like conformation of the channel that involves a rearrangement of several pore helices. The expansion of the outer pore enhances blocker sensitivity and enables 1PBC to bind at a site within the transmembrane electric field. Our results define the mechanism of inhibition and gating and will facilitate the design of new, potent TMEM16A modulators. | |||||||||
History |
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Structure visualization
Structure viewer | Molecule: ![]() ![]() |
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Downloads & links
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PDBx/mmCIF format | ![]() | 278.4 KB | Display | ![]() |
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PDB format | ![]() | 222.2 KB | Display | ![]() |
PDBx/mmJSON format | ![]() | Tree view | ![]() | |
Others | ![]() |
-Validation report
Summary document | ![]() | 1016.1 KB | Display | ![]() |
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Full document | ![]() | 1 MB | Display | |
Data in XML | ![]() | 50.9 KB | Display | |
Data in CIF | ![]() | 69.6 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 14753MC M: map data used to model this data C: citing same article ( |
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Similar structure data | Similarity search - Function & homology ![]() |
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Links
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Assembly
Deposited unit | ![]()
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Noncrystallographic symmetry (NCS) | NCS domain:
NCS domain segments:
NCS oper: (Code: givenMatrix: (-0.999980068895, -0.0038673588816, -0.00499052590843), (0.0038441086586, -0.999981753054, 0.004660084584), (-0.00500845706608, 0.00464080757951, 0.99997668886)Vector: ...NCS oper: (Code: given Matrix: (-0.999980068895, -0.0038673588816, -0.00499052590843), Vector: |
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Components
#1: Protein | Mass: 111058.992 Da / Num. of mol.: 2 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() ![]() #2: Chemical | ChemComp-CA / #3: Chemical | 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 |
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Sample preparation
Component | Name: mouse TMEM16A ac splice variant in complex with 1PBC and calcium Type: ORGANELLE OR CELLULAR COMPONENT / Entity ID: #1 / Source: RECOMBINANT |
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Source (natural) | Organism: ![]() ![]() |
Source (recombinant) | Organism: ![]() |
Buffer solution | pH: 7.4 |
Specimen | Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES |
Specimen support | Grid type: Quantifoil R1.2/1.3 |
Vitrification | Instrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE-PROPANE |
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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: ![]() |
Electron lens | Mode: BRIGHT FIELD / Nominal magnification: 130000 X / Nominal defocus max: 2400 nm / Nominal defocus min: 1000 nm / Alignment procedure: COMA FREE |
Specimen holder | Cryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER |
Image recording | Electron dose: 61 e/Å2 / Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k) |
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Processing
Software |
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CTF correction | Type: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||||||||||
3D reconstruction | Resolution: 2.85 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 101813 / Symmetry type: POINT | ||||||||||||||||||||||||
Refinement | Cross valid method: NONE Stereochemistry target values: GeoStd + Monomer Library + CDL v1.2 | ||||||||||||||||||||||||
Displacement parameters | Biso mean: 36.56 Å2 | ||||||||||||||||||||||||
Refine LS restraints |
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Refine LS restraints NCS | Type: NCS constraints / Rms dev position: 0.000706321995647 Å |