MUC2 D1 with Cu(II)

Experimental Data Snapshot

  • Resolution: 2.48 Å
  • R-Value Free: 0.260 
  • R-Value Work: 0.186 
  • R-Value Observed: 0.190 

Starting Model: experimental
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This is version 1.2 of the entry. See complete history


Intestinal mucin is a chaperone of multivalent copper.

Reznik, N.Gallo, A.D.Rush, K.W.Javitt, G.Fridmann-Sirkis, Y.Ilani, T.Nairner, N.A.Fishilevich, S.Gokhman, D.Chacon, K.N.Franz, K.J.Fass, D.

(2022) Cell 185: 4206

  • DOI: https://doi.org/10.1016/j.cell.2022.09.021
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Mucus protects the epithelial cells of the digestive and respiratory tracts from pathogens and other hazards. Progress in determining the molecular mechanisms of mucus barrier function has been limited by the lack of high-resolution structural information on mucins, the giant, secreted, gel-forming glycoproteins that are the major constituents of mucus. Here, we report how mucin structures we determined enabled the discovery of an unanticipated protective role of mucus: managing the toxic transition metal copper. Using two juxtaposed copper binding sites, one for Cu 2+ and the other for Cu 1+ , the intestinal mucin, MUC2, prevents copper toxicity by blocking futile redox cycling and the squandering of dietary antioxidants, while nevertheless permitting uptake of this important trace metal into cells. These findings emphasize the value of molecular structure in advancing mucosal biology, while introducing mucins, produced in massive quantities to guard extensive mucosal surfaces, as extracellular copper chaperones.

  • Organizational Affiliation

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

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Mucin-2395Homo sapiensMutation(s): 0 
Gene Names: MUC2
Find proteins for Q02817 (Homo sapiens)
Explore Q02817 
Go to UniProtKB:  Q02817
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ02817
Glycosylation Sites: 1Go to GlyGen: Q02817-1
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.48 Å
  • R-Value Free: 0.260 
  • R-Value Work: 0.186 
  • R-Value Observed: 0.190 
  • Space Group: C 2 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 95.9α = 90
b = 141.21β = 90
c = 68.52γ = 90
Software Package:
Software NamePurpose
PDB_EXTRACTdata extraction
HKL-3000data reduction
XSCALEdata scaling

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Israel Science Foundation2660/20

Revision History  (Full details and data files)

  • Version 1.0: 2022-10-26
    Type: Initial release
  • Version 1.1: 2022-11-09
    Changes: Database references
  • Version 1.2: 2024-01-31
    Changes: Data collection, Refinement description