Mucin 2 D3 domain

Experimental Data Snapshot

  • Resolution: 2.70 Å
  • R-Value Free: 0.283 
  • R-Value Work: 0.217 
  • R-Value Observed: 0.220 

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This is version 1.4 of the entry. See complete history


Intestinal Gel-Forming Mucins Polymerize by Disulfide-Mediated Dimerization of D3 Domains.

Javitt, G.Calvo, M.L.G.Albert, L.Reznik, N.Ilani, T.Diskin, R.Fass, D.

(2019) J Mol Biol 431: 3740-3752

  • DOI: https://doi.org/10.1016/j.jmb.2019.07.018
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    The mucin 2 glycoprotein assembles into a complex hydrogel that protects intestinal epithelia and houses the gut microbiome. A major step in mucin 2 assembly is further multimerization of preformed mucin dimers, thought to produce a honeycomb-like arrangement upon hydrogel expansion. Important open questions are how multiple mucin 2 dimers become covalently linked to one another and how mucin 2 multimerization compares with analogous processes in related polymers such as respiratory tract mucins and the hemostasis protein von Willebrand factor. Here we report the x-ray crystal structure of the mucin 2 multimerization module, found to form a dimer linked by two intersubunit disulfide bonds. The dimer structure calls into question the current model for intestinal mucin assembly, which proposes disulfide-mediated trimerization of the same module. Key residues making interactions across the dimer interface are highly conserved in intestinal mucin orthologs, supporting the physiological relevance of the observed quaternary structure. With knowledge of the interface residues, it can be demonstrated that many of these amino acids are also present in other mucins and in von Willebrand factor, further indicating that the stable dimer arrangement reported herein is likely to be shared across this functionally broad protein family. The mucin 2 module structure thus reveals the manner by which both mucins and von Willebrand factor polymerize, drawing deep structural parallels between macromolecular assemblies critical to mucosal epithelia and the vasculature.

  • Organizational Affiliation

    Department of Structural Biology, Weizmann Institute of Science, Rehovot 7610001, Israel.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B, C, D
410Homo sapiensMutation(s): 0 
Gene Names: MUC2SMUC
UniProt & NIH Common Fund Data Resources
Find proteins for Q02817 (Homo sapiens)
Explore Q02817 
Go to UniProtKB:  Q02817
PHAROS:  Q02817
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ02817
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 4 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on NAG

Download Ideal Coordinates CCD File 
F [auth A],
H [auth B],
K [auth B]
C8 H15 N O6
Query on SO4

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L [auth B]
M [auth B]
N [auth B]
P [auth C]
R [auth D]
L [auth B],
M [auth B],
N [auth B],
P [auth C],
R [auth D],
S [auth D]
O4 S
Query on GOL

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E [auth A],
I [auth B],
J [auth B]
C3 H8 O3
Query on CA

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G [auth A],
O [auth B],
Q [auth C],
T [auth D]
Experimental Data & Validation

Experimental Data

  • Resolution: 2.70 Å
  • R-Value Free: 0.283 
  • R-Value Work: 0.217 
  • R-Value Observed: 0.220 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 152.461α = 90
b = 156.925β = 90
c = 93.584γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
XDSdata scaling

Structure Validation

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Ligand Structure Quality Assessment 

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2019-08-14
    Type: Initial release
  • Version 1.1: 2019-09-18
    Changes: Data collection, Database references
  • Version 1.2: 2020-01-29
    Changes: Data collection
  • Version 1.3: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Data collection, Derived calculations, Structure summary
  • Version 1.4: 2024-01-24
    Changes: Data collection, Database references, Refinement description, Structure summary