The crystal structure of IgE Fc reveals an asymmetrically bent conformation

Experimental Data Snapshot

  • Resolution: 2.60 Å
  • R-Value Free: 0.297 
  • R-Value Work: 0.218 

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The crystal structure of IgE Fc reveals an asymmetrically bent conformation

Wan, T.Beavil, R.L.Fabiane, S.M.Beavil, A.J.Sohi, M.K.Keown, M.Young, R.J.Henry, A.J.Owens, R.J.Gould, H.J.Sutton, B.J.

(2002) Nat Immunol 3: 681-686

  • DOI: https://doi.org/10.1038/ni811
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    The distinguishing structural feature of immunoglobulin E (IgE), the antibody responsible for allergic hypersensitivity, is the C epsilon 2 domain pair that replaces the hinge region of IgG. The crystal structure of the IgE Fc (constant fragment) at a 2.6-A resolution has revealed these domains. They display a distinctive, disulfide-linked Ig domain interface and are folded back asymmetrically onto the C epsilon 3 and C epsilon 4 domains, which causes an acute bend in the IgE molecule. The structure implies that a substantial conformational change involving C epsilon 2 must accompany binding to the mast cell receptor Fc epsilon RI. This may be the basis of the exceptionally slow dissociation rate of the IgE-Fc epsilon RI complex and, thus, of the ability of IgE to cause persistent allergic sensitization of mast cells.

  • Organizational Affiliation

    The Randall Centre, King's College London, New Hunt's House, London SE1 1UL, UK.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Immunoglobulin heavy chain epsilon-1
A, B
327Homo sapiensMutation(s): 3 
Gene Names: IgE(ND)
UniProt & NIH Common Fund Data Resources
Find proteins for P01854 (Homo sapiens)
Explore P01854 
Go to UniProtKB:  P01854
PHAROS:  P01854
GTEx:  ENSG00000211891 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP01854
Sequence Annotations
  • Reference Sequence


Entity ID: 2
MoleculeChains Length2D Diagram Glycosylation3D Interactions
Glycosylation Resources
GlyTouCan:  G55220VL
GlyCosmos:  G55220VL
GlyGen:  G55220VL
Entity ID: 3
MoleculeChains Length2D Diagram Glycosylation3D Interactions
Glycosylation Resources
GlyTouCan:  G34059IB
GlyCosmos:  G34059IB
GlyGen:  G34059IB
Experimental Data & Validation

Experimental Data

  • Resolution: 2.60 Å
  • R-Value Free: 0.297 
  • R-Value Work: 0.218 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 129.31α = 90
b = 74.83β = 90
c = 78.65γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALAdata scaling
FFFEARmodel building
CCP4data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2002-09-18
    Type: Initial release
  • Version 1.1: 2008-04-26
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Non-polymer description, Version format compliance
  • Version 1.3: 2017-10-04
    Changes: Refinement description
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Atomic model, Data collection, Derived calculations, Structure summary
  • Version 2.1: 2021-10-27
    Changes: Database references, Structure summary
  • Version 2.2: 2023-12-27
    Changes: Data collection