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Open data
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Basic information
Entry | Database: PDB / ID: 6uea | |||||||||
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Title | Structure of pentameric sIgA complex | |||||||||
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![]() | IMMUNE SYSTEM / immunoglobulin | |||||||||
Function / homology | ![]() polymeric immunoglobulin receptor activity / immunoglobulin transcytosis in epithelial cells mediated by polymeric immunoglobulin receptor / dimeric IgA immunoglobulin complex / polymeric immunoglobulin binding / secretory dimeric IgA immunoglobulin complex / pentameric IgM immunoglobulin complex / monomeric IgA immunoglobulin complex / secretory IgA immunoglobulin complex / Fc receptor signaling pathway / IgA binding ...polymeric immunoglobulin receptor activity / immunoglobulin transcytosis in epithelial cells mediated by polymeric immunoglobulin receptor / dimeric IgA immunoglobulin complex / polymeric immunoglobulin binding / secretory dimeric IgA immunoglobulin complex / pentameric IgM immunoglobulin complex / monomeric IgA immunoglobulin complex / secretory IgA immunoglobulin complex / Fc receptor signaling pathway / IgA binding / detection of chemical stimulus involved in sensory perception of bitter taste / glomerular filtration / IgA immunoglobulin complex / azurophil granule membrane / positive regulation of respiratory burst / receptor clustering / humoral immune response / Scavenging of heme from plasma / immunoglobulin complex, circulating / immunoglobulin receptor binding / complement activation, classical pathway / Cell surface interactions at the vascular wall / antigen binding / B cell receptor signaling pathway / epidermal growth factor receptor signaling pathway / protein-macromolecule adaptor activity / antibacterial humoral response / protein-containing complex assembly / adaptive immune response / receptor complex / blood microparticle / immune response / innate immune response / Neutrophil degranulation / protein homodimerization activity / extracellular space / extracellular exosome / extracellular region / plasma membrane Similarity search - Function | |||||||||
Biological species | ![]() | |||||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3 Å | |||||||||
![]() | Kumar, N. / Arthur, C.P. / Ciferri, C. / Matsumoto, M.L. | |||||||||
![]() | ![]() Title: Structure of the secretory immunoglobulin A core. Authors: Nikit Kumar / Christopher P Arthur / Claudio Ciferri / Marissa L Matsumoto / ![]() Abstract: Secretory immunoglobulin A (sIgA) represents the immune system's first line of defense against mucosal pathogens. IgAs are transported across the epithelium, as dimers and higher-order polymers, by ...Secretory immunoglobulin A (sIgA) represents the immune system's first line of defense against mucosal pathogens. IgAs are transported across the epithelium, as dimers and higher-order polymers, by the polymeric immunoglobulin receptor (pIgR). Upon reaching the luminal side, sIgAs mediate host protection and pathogen neutralization. In recent years, an increasing amount of attention has been given to IgA as a novel therapeutic antibody. However, despite extensive studies, sIgA structures have remained elusive. Here, we determine the atomic resolution structures of dimeric, tetrameric, and pentameric IgA-Fc linked by the joining chain (JC) and in complex with the secretory component of the pIgR. We suggest a mechanism in which the JC templates IgA oligomerization and imparts asymmetry for pIgR binding and transcytosis. This framework will inform the design of future IgA-based therapeutics. | |||||||||
History |
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Structure visualization
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Structure viewer | Molecule: ![]() ![]() |
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Downloads & links
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Download
PDBx/mmCIF format | ![]() | 480 KB | Display | ![]() |
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PDB format | ![]() | 392.8 KB | Display | ![]() |
PDBx/mmJSON format | ![]() | Tree view | ![]() | |
Others | ![]() |
-Validation report
Summary document | ![]() | 1.4 MB | Display | ![]() |
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Full document | ![]() | 1.4 MB | Display | |
Data in XML | ![]() | 77.8 KB | Display | |
Data in CIF | ![]() | 119.4 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 20752MC ![]() 6ue7C ![]() 6ue8C ![]() 6ue9C M: map data used to model this data C: citing same article ( |
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Similar structure data |
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Links
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Assembly
Deposited unit | ![]()
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Components
-Antibody / Protein / Immunoglobulin ... , 3 types, 12 molecules ABFGKLEHIJCD
#1: Antibody | Mass: 26682.146 Da / Num. of mol.: 10 / Fragment: UNP residues 110-340 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() ![]() #2: Protein | | Mass: 65154.094 Da / Num. of mol.: 1 / Fragment: UNP residues 19-603 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() ![]() #3: Protein | | Mass: 15611.458 Da / Num. of mol.: 1 / Fragment: UNP residues 23-159 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() ![]() |
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-Sugars , 3 types, 9 molecules ![](data/chem/img/NAG.gif)
#4: Polysaccharide | 2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose Source method: isolated from a genetically manipulated source #5: Polysaccharide | Source method: isolated from a genetically manipulated source #6: Sugar | |
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-Details
Has ligand of interest | N |
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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: pentameric sIgA complex / Type: COMPLEX / Entity ID: #1-#3 / Source: RECOMBINANT |
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Molecular weight | Value: 0.347 MDa / Experimental value: NO |
Source (natural) | Organism: ![]() |
Source (recombinant) | Organism: ![]() ![]() |
Buffer solution | pH: 7.2 |
Specimen | Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES |
Specimen support | Details: unspecified |
Vitrification | Instrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 277 K |
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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 / C2 aperture diameter: 100 µm |
Specimen holder | Cryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER |
Image recording | Average exposure time: 10 sec. / Electron dose: 51.91 e/Å2 / Film or detector model: GATAN K2 SUMMIT (4k x 4k) |
EM imaging optics | Energyfilter name: GIF Bioquantum / Energyfilter slit width: 20 eV |
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Processing
EM software |
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CTF correction | Type: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||
3D reconstruction | Resolution: 3 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 165069 / Symmetry type: POINT |