2BO2

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


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.6 Å
  • R-Value Free: 0.260 
  • R-Value Work: 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: 10.1074/jbc.M702588200
  • Primary Citation of Related Structures:  

  • 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 ...

    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.


    Related Citations: 
    • Crystallization and Preliminary X-Ray Diffraction Analysis of Three Egf Domains of Emr2, a 7Tm Immune-System Molecule
      Abbott, R.J.M.,Knott, V.,Roversi, P.,Neudeck, S.,Lukacik, P.,Handford, P.A.,Lea, S.M.
      (2004) Acta Crystallogr.,Sect.D 60: 936


    Organizational Affiliation

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




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
EGF-LIKE MODULE CONTAINING MUCIN-LIKE HORMONE RECEPTOR-LIKE 2 PRECURSOR
A, B
143Homo sapiensMutation(s): 0 
Gene Names: ADGRE2 (EMR2)
Find proteins for Q9UHX3 (Homo sapiens)
Go to Gene View: ADGRE2
Go to UniProtKB:  Q9UHX3
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CA
Query on CA

Download SDF File 
Download CCD File 
A, B
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
CAC
Query on CAC

Download SDF File 
Download CCD File 
A
CACODYLATE ION
dimethylarsinate
C2 H6 As O2
OGGXGZAMXPVRFZ-UHFFFAOYSA-M
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.6 Å
  • R-Value Free: 0.260 
  • R-Value Work: 0.238 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 80.845α = 90.00
b = 61.377β = 84.10
c = 35.584γ = 90.00
Software Package:
Software NamePurpose
MOLREPphasing
MOSFLMdata reduction
TNTrefinement
SCALAdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2006-08-09
    Type: Initial release
  • Version 1.1: 2011-05-19
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance