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- EMDB-4361: Cryo-EM density of heteromeric mLRRC8A/C volume-regulated anion c... -
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Open data
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Basic information
Entry | Database: EMDB / ID: EMD-4361 | |||||||||
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Title | Cryo-EM density of heteromeric mLRRC8A/C volume-regulated anion channel at 7.94 A resolution | |||||||||
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Biological species | ![]() ![]() | |||||||||
Method | single particle reconstruction / cryo EM / Resolution: 7.94 Å | |||||||||
![]() | Sawicka M / Deneka D / Lam AKM / Paulino C / Dutzler R | |||||||||
![]() | ![]() Title: Structure of a volume-regulated anion channel of the LRRC8 family. Authors: Dawid Deneka / Marta Sawicka / Andy K M Lam / Cristina Paulino / Raimund Dutzler / ![]() ![]() Abstract: Volume-regulated anion channels are activated in response to hypotonic stress. These channels are composed of closely related paralogues of the leucine-rich repeat-containing protein 8 (LRRC8) family ...Volume-regulated anion channels are activated in response to hypotonic stress. These channels are composed of closely related paralogues of the leucine-rich repeat-containing protein 8 (LRRC8) family that co-assemble to form hexameric complexes. Here, using cryo-electron microscopy and X-ray crystallography, we determine the structure of a homomeric channel of the obligatory subunit LRRC8A. This protein conducts ions and has properties in common with endogenous heteromeric channels. Its modular structure consists of a transmembrane pore domain followed by a cytoplasmic leucine-rich repeat domain. The transmembrane domain, which is structurally related to connexin proteins, is wide towards the cytoplasm but constricted on the outside by a structural unit that acts as a selectivity filter. An excess of basic residues in the filter and throughout the pore attracts anions by electrostatic interaction. Our work reveals the previously unknown architecture of volume-regulated anion channels and their mechanism of selective anion conduction. | |||||||||
History |
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Structure visualization
Movie |
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Structure viewer | EM map: ![]() ![]() ![]() |
Supplemental images |
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Downloads & links
-EMDB archive
Map data | ![]() | 92.6 MB | ![]() | |
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Header (meta data) | ![]() ![]() | 10.9 KB 10.9 KB | Display Display | ![]() |
FSC (resolution estimation) | ![]() | 6.2 KB | Display | ![]() |
Images | ![]() | 11.4 KB | ||
Archive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 4362C ![]() 4366C ![]() 4367C ![]() 6fnwC ![]() 6g8zC ![]() 6g9lC ![]() 6g9oC C: citing same article ( |
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Similar structure data |
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Links
EMDB pages | ![]() ![]() |
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Map
File | ![]() | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Voxel size | X=Y=Z: 1.075 Å | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Density |
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Symmetry | Space group: 1 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Details | EMDB XML:
CCP4 map header:
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-Supplemental data
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Sample components
-Entire : Heterohexamer of mLRRC8A and mLRRC8C
Entire | Name: Heterohexamer of mLRRC8A and mLRRC8C |
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Components |
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-Supramolecule #1: Heterohexamer of mLRRC8A and mLRRC8C
Supramolecule | Name: Heterohexamer of mLRRC8A and mLRRC8C / type: complex / ID: 1 / Parent: 0 |
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Source (natural) | Organism: ![]() ![]() |
Recombinant expression | Organism: ![]() |
-Experimental details
-Structure determination
Method | cryo EM |
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![]() | single particle reconstruction |
Aggregation state | particle |
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Sample preparation
Concentration | 3.5 mg/mL | ||||||||||||
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Buffer | pH: 8.5 Component:
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Grid | Model: Quantifoil R1.2/1.3 / Material: GOLD / Mesh: 200 / Support film - Material: CARBON / Support film - topology: HOLEY / Pretreatment - Type: GLOW DISCHARGE / Pretreatment - Atmosphere: AIR | ||||||||||||
Vitrification | Cryogen name: ETHANE-PROPANE / Chamber humidity: 100 % / Chamber temperature: 277 K / Instrument: FEI VITROBOT MARK IV / Details: 2.5 ul sample volume, 3-7 s blotting time. |
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Electron microscopy
Microscope | FEI POLARA 300 |
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Image recording | Film or detector model: GATAN K2 SUMMIT (4k x 4k) / Detector mode: SUPER-RESOLUTION / Digitization - Frames/image: 1-50 / Number real images: 1545 / Average exposure time: 12.5 sec. / Average electron dose: 1.2 e/Å2 |
Electron beam | Acceleration voltage: 300 kV / Electron source: ![]() |
Electron optics | Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Cs: 2.0 mm / Nominal defocus max: 3.2 µm / Nominal defocus min: 0.5 µm / Nominal magnification: 37313 |
Sample stage | Cooling holder cryogen: NITROGEN |
Experimental equipment | ![]() Model: Tecnai Polara / Image courtesy: FEI Company |