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Open data
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Basic information
Entry | Database: PDB / ID: 7a5o | ||||||
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Title | Human MUC2 AAs 21-1397 | ||||||
![]() | Mucin-2 | ||||||
![]() | STRUCTURAL PROTEIN / Glycoprotein / Extracellular / Polymer | ||||||
Function / homology | ![]() inner mucus layer / outer mucus layer / host-mediated regulation of intestinal microbiota composition / Defective GALNT3 causes HFTC / Defective C1GALT1C1 causes TNPS / Defective GALNT12 causes CRCS1 / Termination of O-glycan biosynthesis / O-linked glycosylation of mucins / maintenance of gastrointestinal epithelium / mucus secretion ...inner mucus layer / outer mucus layer / host-mediated regulation of intestinal microbiota composition / Defective GALNT3 causes HFTC / Defective C1GALT1C1 causes TNPS / Defective GALNT12 causes CRCS1 / Termination of O-glycan biosynthesis / O-linked glycosylation of mucins / maintenance of gastrointestinal epithelium / mucus secretion / detoxification of copper ion / cupric ion binding / Dectin-2 family / cuprous ion binding / extracellular matrix / Golgi lumen / collagen-containing extracellular matrix / extracellular space / plasma membrane Similarity search - Function | ||||||
Biological species | ![]() | ||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.95 Å | ||||||
![]() | Javitt, G. / Khmelnitsky, L. / Albert, L. / Elad, N. / Ilani, T. / Diskin, R. / Fass, D. | ||||||
![]() | ![]() Title: Assembly Mechanism of Mucin and von Willebrand Factor Polymers. Authors: Gabriel Javitt / Lev Khmelnitsky / Lis Albert / Lavi Shlomo Bigman / Nadav Elad / David Morgenstern / Tal Ilani / Yaakov Levy / Ron Diskin / Deborah Fass / ![]() Abstract: The respiratory and intestinal tracts are exposed to physical and biological hazards accompanying the intake of air and food. Likewise, the vasculature is threatened by inflammation and trauma. Mucin ...The respiratory and intestinal tracts are exposed to physical and biological hazards accompanying the intake of air and food. Likewise, the vasculature is threatened by inflammation and trauma. Mucin glycoproteins and the related von Willebrand factor guard the vulnerable cell layers in these diverse systems. Colon mucins additionally house and feed the gut microbiome. Here, we present an integrated structural analysis of the intestinal mucin MUC2. Our findings reveal the shared mechanism by which complex macromolecules responsible for blood clotting, mucociliary clearance, and the intestinal mucosal barrier form protective polymers and hydrogels. Specifically, cryo-electron microscopy and crystal structures show how disulfide-rich bridges and pH-tunable interfaces control successive assembly steps in the endoplasmic reticulum and Golgi apparatus. Remarkably, a densely O-glycosylated mucin domain performs an organizational role in MUC2. The mucin assembly mechanism and its adaptation for hemostasis provide the foundation for rational manipulation of barrier function and coagulation. | ||||||
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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 | ![]() | 1.3 MB | Display | ![]() |
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PDB format | ![]() | 1 MB | Display | ![]() |
PDBx/mmJSON format | ![]() | Tree view | ![]() | |
Others | ![]() |
-Validation report
Summary document | ![]() | 1.3 MB | Display | ![]() |
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Full document | ![]() | 1.3 MB | Display | |
Data in XML | ![]() | 160.1 KB | Display | |
Data in CIF | ![]() | 268.4 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 10517MC ![]() 6tm2C ![]() 6tm6C 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
#1: Protein | Mass: 152874.516 Da / Num. of mol.: 10 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() #2: Polysaccharide | 2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose #3: Chemical | ChemComp-CA / #4: Sugar | ChemComp-NAG / #5: Water | ChemComp-HOH / | 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: Mucin 2 amino terminal domain filament / Type: COMPLEX / Entity ID: #1 / Source: RECOMBINANT |
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Source (natural) | Organism: ![]() |
Source (recombinant) | Organism: ![]() |
Buffer solution | pH: 5.7 |
Specimen | Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES |
Specimen support | Grid type: Quantifoil |
Vitrification | Cryogen name: ETHANE |
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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 |
Image recording | Average exposure time: 1.5 sec. / Electron dose: 48 e/Å2 / Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k) / Num. of grids imaged: 1 / Num. of real images: 3242 |
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Processing
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CTF correction | Type: PHASE FLIPPING AND AMPLITUDE CORRECTION | |||||||||||||||||||||||||||||||||||
Particle selection | Num. of particles selected: 987943 Details: Automated particle picking using 2D class averages as templates | |||||||||||||||||||||||||||||||||||
Symmetry | Point symmetry: C2 (2 fold cyclic) | |||||||||||||||||||||||||||||||||||
3D reconstruction | Resolution: 2.95 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 178136 / Algorithm: BACK PROJECTION / Num. of class averages: 1 / Symmetry type: POINT |