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Yorodumi- PDB-8ecy: cryoEM structure of bovine bestrophin-2 and glutamine synthetase ... -
+Open data
-Basic information
Entry | Database: PDB / ID: 8ecy | |||||||||
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Title | cryoEM structure of bovine bestrophin-2 and glutamine synthetase complex | |||||||||
Components |
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Keywords | MEMBRANE PROTEIN / ion channel / transport / anion channel | |||||||||
Function / homology | Function and homology information Astrocytic Glutamate-Glutamine Uptake And Metabolism / Glutamate and glutamine metabolism / protein S-acyltransferase / protein palmitoylation / protein-cysteine S-palmitoyltransferase activity / regulation of sprouting angiogenesis / regulation of endothelial cell migration / Stimuli-sensing channels / glutamine synthetase / glutamine biosynthetic process ...Astrocytic Glutamate-Glutamine Uptake And Metabolism / Glutamate and glutamine metabolism / protein S-acyltransferase / protein palmitoylation / protein-cysteine S-palmitoyltransferase activity / regulation of sprouting angiogenesis / regulation of endothelial cell migration / Stimuli-sensing channels / glutamine synthetase / glutamine biosynthetic process / glutamine synthetase activity / chloride channel activity / chloride channel complex / angiogenesis / endoplasmic reticulum / mitochondrion / ATP binding / metal ion binding / plasma membrane / cytosol / cytoplasm Similarity search - Function | |||||||||
Biological species | Bos taurus (cattle) | |||||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2 Å | |||||||||
Authors | Owji, A.P. / Kittredge, A.K. / Yang, T. | |||||||||
Funding support | United States, 2items
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Citation | Journal: Nature / Year: 2022 Title: Bestrophin-2 and glutamine synthetase form a complex for glutamate release. Authors: Aaron P Owji / Kuai Yu / Alec Kittredge / Jiali Wang / Yu Zhang / Tingting Yang / Abstract: Bestrophin-2 (BEST2) is a member of the bestrophin family of calcium-activated anion channels that has a critical role in ocular physiology. Here we uncover a directional permeability of BEST2 to ...Bestrophin-2 (BEST2) is a member of the bestrophin family of calcium-activated anion channels that has a critical role in ocular physiology. Here we uncover a directional permeability of BEST2 to glutamate that heavily favours glutamate exit, identify glutamine synthetase (GS) as a binding partner of BEST2 in the ciliary body of the eye, and solve the structure of the BEST2-GS complex. BEST2 reduces cytosolic GS activity by tethering GS to the cell membrane. GS extends the ion conducting pathway of BEST2 through its central cavity and inhibits BEST2 channel function in the absence of intracellular glutamate, but sensitizes BEST2 to intracellular glutamate, which promotes the opening of BEST2 and thus relieves the inhibitory effect of GS. We demonstrate the physiological role of BEST2 in conducting chloride and glutamate and the influence of GS in non-pigmented ciliary epithelial cells. Together, our results reveal a novel mechanism of glutamate release through BEST2-GS. | |||||||||
History |
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-Structure visualization
Structure viewer | Molecule: MolmilJmol/JSmol |
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-Downloads & links
-Download
PDBx/mmCIF format | 8ecy.cif.gz | 1.1 MB | Display | PDBx/mmCIF format |
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PDB format | pdb8ecy.ent.gz | 921.9 KB | Display | PDB format |
PDBx/mmJSON format | 8ecy.json.gz | Tree view | PDBx/mmJSON format | |
Others | Other downloads |
-Validation report
Arichive directory | https://data.pdbj.org/pub/pdb/validation_reports/ec/8ecy ftp://data.pdbj.org/pub/pdb/validation_reports/ec/8ecy | HTTPS FTP |
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-Related structure data
Related structure data | 28025MC M: map data used to model this data C: citing same article (ref.) |
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Similar structure data | Similarity search - Function & homologyF&H Search |
-Links
-Assembly
Deposited unit |
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1 |
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-Components
-Protein , 2 types, 15 molecules ECGKNAJLQHDBFIM
#1: Protein | Mass: 47424.754 Da / Num. of mol.: 5 Source method: isolated from a genetically manipulated source Source: (gene. exp.) Bos taurus (cattle) / Gene: BEST2 / Cell line (production host): HEK293F / Production host: Homo sapiens (human) / References: UniProt: E1BF86 #2: Protein | Mass: 42085.414 Da / Num. of mol.: 10 Source method: isolated from a genetically manipulated source Source: (gene. exp.) Bos taurus (cattle) / Gene: GLUL / Production host: Escherichia coli (E. coli) References: UniProt: P15103, glutamine synthetase, protein S-acyltransferase |
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-Non-polymers , 4 types, 2060 molecules
#3: Chemical | ChemComp-CA / #4: Chemical | ChemComp-CL / #5: Chemical | ChemComp-MN / #6: Water | ChemComp-HOH / | |
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-Details
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 |
-Sample preparation
Component | Name: Best2-GS / Type: COMPLEX / Entity ID: #1-#2 / Source: RECOMBINANT |
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Molecular weight | Experimental value: NO |
Source (natural) | Organism: Homo sapiens (human) |
Source (recombinant) | Organism: Homo sapiens (human) / Strain: HEK293F |
Buffer solution | pH: 7.8 |
Specimen | Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES |
Vitrification | Cryogen name: ETHANE |
-Electron microscopy imaging
Experimental equipment | Model: Titan Krios / Image courtesy: FEI Company |
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Microscopy | Model: TFS KRIOS |
Electron gun | Electron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM |
Electron lens | Mode: BRIGHT FIELDBright-field microscopy / Nominal defocus max: 2000 nm / Nominal defocus min: 1000 nm / Cs: 2.7 mm |
Image recording | Electron dose: 1.16 e/Å2 / Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k) |
-Processing
EM software |
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CTF correction | Type: PHASE FLIPPING AND AMPLITUDE CORRECTION | |||||||||||||||
Particle selection | Num. of particles selected: 78623 | |||||||||||||||
Symmetry | Point symmetry: D5 (2x5 fold dihedral) | |||||||||||||||
3D reconstruction | Resolution: 2 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 25618 / Symmetry type: POINT |