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- PDB-7pp6: MUC2 Tubules of D1D2D3 domains -

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Basic information

Entry
Database: PDB / ID: 7pp6
TitleMUC2 Tubules of D1D2D3 domains
ComponentsMucin-2
KeywordsANTIMICROBIAL PROTEIN / MUC2 / Mucin / Tubule / 2-start / helix
Function / homology
Function and homology information


extracellular region
Similarity search - Function
WxxW domain / Mucin-2 protein WxxW repeating region / Von Willebrand factor-like domain / : / C8 domain / Uncharacterised domain, cysteine-rich / C8 / von Willebrand factor, type D domain / von Willebrand factor type D domain / VWFD domain profile. ...WxxW domain / Mucin-2 protein WxxW repeating region / Von Willebrand factor-like domain / : / C8 domain / Uncharacterised domain, cysteine-rich / C8 / von Willebrand factor, type D domain / von Willebrand factor type D domain / VWFD domain profile. / von Willebrand factor (vWF) type D domain / von Willebrand factor (vWF) type C domain / Trypsin Inhibitor-like, cysteine rich domain / Serine protease inhibitor-like superfamily / Trypsin Inhibitor like cysteine rich domain / C-terminal cystine knot signature. / C-terminal cystine knot domain profile. / Cystine knot, C-terminal / C-terminal cystine knot-like domain (CTCK) / VWFC domain signature. / VWFC domain profile. / von Willebrand factor (vWF) type C domain / VWFC domain
Similarity search - Domain/homology
Mucin 2, oligomeric mucus/gel-forming
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / helical reconstruction / cryo EM / Resolution: 3.4 Å
AuthorsJavitt, G. / Fass, D.
Funding support1items
OrganizationGrant numberCountry
Not funded
CitationJournal: Proc Natl Acad Sci U S A / Year: 2022
Title: Helical self-assembly of a mucin segment suggests an evolutionary origin for von Willebrand factor tubules.
Authors: Gabriel Javitt / Deborah Fass /
Abstract: The glycoprotein von Willebrand factor (VWF) contributes to hemostasis by stanching injuries in blood vessel walls. A distinctive feature of VWF is its assembly into long, helical tubules in ...The glycoprotein von Willebrand factor (VWF) contributes to hemostasis by stanching injuries in blood vessel walls. A distinctive feature of VWF is its assembly into long, helical tubules in endothelial cells prior to secretion. When VWF is released into the bloodstream, these tubules unfurl to release linear polymers that bind subendothelial collagen at wound sites, recruit platelets, and initiate the clotting cascade. VWF evolved from gel-forming mucins, the polymeric glycoproteins that coat and protect exposed epithelia. Despite the divergent function of VWF in blood vessel repair, sequence conservation and shared domain organization imply that VWF retained key aspects of the mucin bioassembly mechanism. Here, we show using cryo-electron microscopy that the ability to form tubules, a property hitherto thought to have arisen as a VWF adaptation to the vasculature, is a feature of the amino-terminal region of mucin. This segment of the human intestinal gel-forming mucin (MUC2) was found to self-assemble into tubules with a striking resemblance to those of VWF itself. To facilitate a comparison, we determined the residue-resolution structure of tubules formed by the homologous segment of VWF. The structures of the MUC2 and VWF tubules revealed the flexible joints and the intermolecular interactions required for tubule formation. Steric constraints in full-length MUC2 suggest that linear filaments, a previously observed supramolecular assembly form, are more likely than tubules to be the physiological mucin storage intermediate. Nevertheless, MUC2 tubules indicate a possible evolutionary origin for VWF tubules and elucidate design principles present in mucins and VWF.
History
DepositionSep 13, 2021Deposition site: PDBE / Processing site: PDBE
Revision 1.0Feb 16, 2022Provider: repository / Type: Initial release
Revision 1.0Feb 16, 2022Data content type: EM metadata / Data content type: EM metadata / Provider: repository / Type: Initial release
Revision 1.0Feb 16, 2022Data content type: FSC / Data content type: FSC / Provider: repository / Type: Initial release
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Revision 1.0Feb 16, 2022Data content type: FSC / Data content type: FSC / Provider: repository / Type: Initial release
Revision 1.0Feb 16, 2022Data content type: Image / Data content type: Image / Provider: repository / Type: Initial release
Revision 1.0Feb 16, 2022Data content type: Primary map / Data content type: Primary map / Provider: repository / Type: Initial release
Revision 1.1May 25, 2022Group: Database references / Category: citation
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Revision 1.2Oct 23, 2024Group: Data collection / Structure summary
Category: chem_comp_atom / chem_comp_bond ...chem_comp_atom / chem_comp_bond / em_admin / pdbx_entry_details / pdbx_modification_feature
Item: _em_admin.last_update / _pdbx_entry_details.has_protein_modification
Revision 1.3Jul 2, 2025Group: Data collection / Category: em_admin / em_software / Item: _em_admin.last_update / _em_software.name
Revision 1.1Jul 2, 2025Data content type: EM metadata / Data content type: EM metadata / EM metadata / Group: Data processing / Experimental summary / Data content type: EM metadata / EM metadata / Category: em_admin / em_software / Data content type: EM metadata / EM metadata / Item: _em_admin.last_update / _em_software.name

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Structure visualization

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Assembly

Deposited unit
A: Mucin-2
B: Mucin-2
C: Mucin-2
D: Mucin-2
E: Mucin-2
G: Mucin-2
hetero molecules


Theoretical massNumber of molelcules
Total (without water)829,80430
Polymers825,8566
Non-polymers3,94824
Water1,65792
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: electron microscopy
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

#1: Protein
Mucin-2


Mass: 137642.609 Da / Num. of mol.: 6
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: MUC2 / Production host: Homo sapiens (human) / References: UniProt: A0A0G2JR65
#2: Polysaccharide
2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose


Type: oligosaccharide / Mass: 424.401 Da / Num. of mol.: 4
Source method: isolated from a genetically manipulated source
DescriptorTypeProgram
DGlcpNAcb1-4DGlcpNAcb1-ROHGlycam Condensed SequenceGMML 1.0
WURCS=2.0/1,2,1/[a2122h-1b_1-5_2*NCC/3=O]/1-1/a4-b1WURCSPDB2Glycan 1.1.0
[][D-1-deoxy-GlcpNAc]{[(4+1)][b-D-GlcpNAc]{}}LINUCSPDB-CARE
#3: Chemical
ChemComp-CA / CALCIUM ION


Mass: 40.078 Da / Num. of mol.: 12 / Source method: obtained synthetically / Formula: Ca
#4: Sugar
ChemComp-NAG / 2-acetamido-2-deoxy-beta-D-glucopyranose / N-acetyl-beta-D-glucosamine / 2-acetamido-2-deoxy-beta-D-glucose / 2-acetamido-2-deoxy-D-glucose / 2-acetamido-2-deoxy-glucose / N-ACETYL-D-GLUCOSAMINE


Type: D-saccharide, beta linking / Mass: 221.208 Da / Num. of mol.: 8 / Source method: obtained synthetically / Formula: C8H15NO6
IdentifierTypeProgram
DGlcpNAcbCONDENSED IUPAC CARBOHYDRATE SYMBOLGMML 1.0
N-acetyl-b-D-glucopyranosamineCOMMON NAMEGMML 1.0
b-D-GlcpNAcIUPAC CARBOHYDRATE SYMBOLPDB-CARE 1.0
GlcNAcSNFG CARBOHYDRATE SYMBOLGMML 1.0
#5: Water ChemComp-HOH / water


Mass: 18.015 Da / Num. of mol.: 92 / Source method: isolated from a natural source / Formula: H2O
Has ligand of interestN
Has protein modificationY

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Experimental details

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Experiment

ExperimentMethod: ELECTRON MICROSCOPY
EM experimentAggregation state: HELICAL ARRAY / 3D reconstruction method: helical reconstruction

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Sample preparation

ComponentName: MUC2 local refinement of 2 beads from D1D2D3 domain tubules
Type: COMPLEX / Entity ID: #1 / Source: RECOMBINANT
Molecular weightExperimental value: NO
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Homo sapiens (human) / Strain: HEK 293F / Plasmid: pCDNA3.1
Buffer solutionpH: 5.4
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationCryogen name: ETHANE

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: FEI TITAN KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD
Image recordingElectron dose: 48 e/Å2 / Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k)

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Processing

Software
NameVersionClassification
phenix.real_space_refine1.19.2_4158refinement
PHENIX1.19.2_4158refinement
EM softwareName: PHENIX / Category: model refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Helical symmertyAngular rotation/subunit: 83.2 ° / Axial rise/subunit: 69.5 Å / Axial symmetry: D2
3D reconstructionResolution: 3.4 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 515422 / Symmetry type: HELICAL
RefinementCross valid method: NONE
Stereochemistry target values: GeoStd + Monomer Library + CDL v1.2
Displacement parametersBiso mean: 142.21 Å2
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.002235586
ELECTRON MICROSCOPYf_angle_d0.532248402
ELECTRON MICROSCOPYf_chiral_restr0.04355370
ELECTRON MICROSCOPYf_plane_restr0.00436332
ELECTRON MICROSCOPYf_dihedral_angle_d7.97125042

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