2BOU

EGF Domains 1,2,5 of human EMR2, a 7-TM immune system molecule, in complex with barium.


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.255 
  • R-Value Work: 0.238 
  • R-Value Observed: 0.238 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Structural and Functional Characterization of a Novel T Cell Receptor Co-Regulatory Protein Complex, Cd97-Cd55.

Abbott, R.J.M.Spendlove, I.Roversi, P.Fitzgibbon, H.Knott, V.Teriete, P.Mcdonnell, J.M.Handford, P.A.Lea, S.M.

(2007) J Biol Chem 282: 22023

  • DOI: https://doi.org/10.1074/jbc.M702588200
  • Primary Citation of Related Structures:  
    2BO2, 2BOU, 2BOX

  • PubMed Abstract: 

    CD97, the archetypal member of the EGF-TM7 protein family, is constitutively expressed on granulocytes and monocytes and rapidly up-regulated on T and B cells following activation. The key isoform of CD97 expressed on leukocytes binds the complement regulatory protein CD55 (also termed decay-accelerating factor). CD97 has been shown recently to mediate co-stimulation of T cells via CD55. Here, we demonstrate that blocking the interaction between CD55 on monocytes and CD97 on T cells leads to inhibition of proliferation and interferon-gamma secretion. This implies that bidirectional interactions between CD97 and CD55 are involved in T cell regulation. Structural studies presented here reveal the molecular basis for this activity. We have solved the structure of EMR2, a very close homolog of CD97, using x-ray crystallography. NMR-based chemical shift mapping of the EMR2-CD55 interaction has allowed us to generate a model for the CD97-CD55 complex. The structure of the complex reveals that the T cell and complement regulatory activities of CD55 occur on opposite faces of the molecule. This suggests that CD55 might simultaneously regulate both the innate and adaptive immune responses, and we have shown that CD55 can still regulate complement when bound to CD97.


  • Organizational Affiliation

    Sir William Dunn School of Pathology, University of Oxford, South Parks Road, Oxford, UK.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
EGF-LIKE MODULE CONTAINING MUCIN-LIKE HORMONE RECEPTOR-LIKE 2 PRECURSOR143Homo sapiensMutation(s): 0 
UniProt & NIH Common Fund Data Resources
Find proteins for Q9UHX3 (Homo sapiens)
Explore Q9UHX3 
Go to UniProtKB:  Q9UHX3
PHAROS:  Q9UHX3
GTEx:  ENSG00000127507 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9UHX3
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.255 
  • R-Value Work: 0.238 
  • R-Value Observed: 0.238 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 91.06α = 90
b = 61.56β = 90
c = 35.47γ = 90
Software Package:
Software NamePurpose
TNTrefinement
MOSFLMdata reduction
SCALAdata scaling
SHARPphasing
DMphasing
SOLOMONphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2006-10-18
    Type: Initial release
  • Version 1.1: 2017-01-25
    Changes: Data collection, Other, Version format compliance
  • Version 1.2: 2024-10-23
    Changes: Data collection, Database references, Derived calculations, Other, Structure summary