1OW0

Crystal structure of human FcaRI bound to IgA1-Fc


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.1 Å
  • R-Value Free: 0.284 
  • R-Value Work: 0.252 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Insights into IgA-mediated immune responses from the crystal structures of human Fc-alpha-RI and its complex with IgA1-Fc

Herr, A.B.Ballister, E.R.Bjorkman, P.J.

(2003) Nature 423: 614-620

  • DOI: 10.1038/nature01685
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Immunoglobulin-alpha (IgA)-bound antigens induce immune effector responses by activating the IgA-specific receptor FcalphaRI (CD89) on immune cells. Here we present crystal structures of human FcalphaRI alone and in a complex with the Fc region of Ig ...

    Immunoglobulin-alpha (IgA)-bound antigens induce immune effector responses by activating the IgA-specific receptor FcalphaRI (CD89) on immune cells. Here we present crystal structures of human FcalphaRI alone and in a complex with the Fc region of IgA1 (Fcalpha). FcalphaRI has two immunoglobulin-like domains that are oriented at approximately right angles to each other. Fcalpha resembles the Fcs of immunoglobulins IgG and IgE, but has differently located interchain disulphide bonds and external rather than interdomain N-linked carbohydrates. Unlike 1:1 FcgammaRIII:IgG and Fc epsilon RI:IgE complexes, two FcalphaRI molecules bind each Fcalpha dimer, one at each Calpha2-Calpha3 junction. The FcalphaRI-binding site on IgA1 overlaps the reported polymeric immunoglobulin receptor (pIgR)-binding site, which might explain why secretory IgA cannot initiate phagocytosis or bind to FcalphaRI-expressing cells in the absence of an integrin co-receptor.


    Related Citations: 
    • Bivalent Binding of IgA1 to FcaRI Suggests a Mechanism for Cytokine Activation of IgA Phagocytosis
      Herr, A.B.,White, C.L.,Milburn, C.,Wu, C.,Bjorkman, P.J.
      (2003) J.Mol.Biol. 327: 645


    Organizational Affiliation

    Division of Biology 114-96, California Institute of Technology, Pasadena, California 91125, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Ig alpha-1 chain C region
A, B
214Homo sapiensMutation(s): 1 
Gene Names: IGHA1
Find proteins for P01876 (Homo sapiens)
Go to UniProtKB:  P01876
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Immunoglobulin alpha Fc receptor
C, D
207Homo sapiensMutation(s): 0 
Gene Names: FCAR (CD89)
Find proteins for P24071 (Homo sapiens)
Go to Gene View: FCAR
Go to UniProtKB:  P24071
Small Molecules
Ligands 8 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
MAN
Query on MAN

Download SDF File 
Download CCD File 
C, D
ALPHA-D-MANNOSE
C6 H12 O6
WQZGKKKJIJFFOK-PQMKYFCFSA-N
 Ligand Interaction
FUC
Query on FUC

Download SDF File 
Download CCD File 
B
ALPHA-L-FUCOSE
C6 H12 O5
SHZGCJCMOBCMKK-SXUWKVJYSA-N
 Ligand Interaction
GAL
Query on GAL

Download SDF File 
Download CCD File 
A, B
BETA-D-GALACTOSE
C6 H12 O6
WQZGKKKJIJFFOK-FPRJBGLDSA-N
 Ligand Interaction
BMA
Query on BMA

Download SDF File 
Download CCD File 
A, B, C, D
BETA-D-MANNOSE
C6 H12 O6
WQZGKKKJIJFFOK-RWOPYEJCSA-N
 Ligand Interaction
NDG
Query on NDG

Download SDF File 
Download CCD File 
C, D
2-(ACETYLAMINO)-2-DEOXY-A-D-GLUCOPYRANOSE
C8 H15 N O6
OVRNDRQMDRJTHS-PVFLNQBWSA-N
 Ligand Interaction
NAG
Query on NAG

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Download CCD File 
A, B, C, D
N-ACETYL-D-GLUCOSAMINE
C8 H15 N O6
OVRNDRQMDRJTHS-FMDGEEDCSA-N
 Ligand Interaction
FUL
Query on FUL

Download SDF File 
Download CCD File 
A
BETA-L-FUCOSE
6-DEOXY-BETA-L-GALACTOSE
C6 H12 O5
SHZGCJCMOBCMKK-KGJVWPDLSA-N
 Ligand Interaction
SIA
Query on SIA

Download SDF File 
Download CCD File 
A, B
O-SIALIC ACID
C11 H19 N O9
SQVRNKJHWKZAKO-YRMXFSIDSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.1 Å
  • R-Value Free: 0.284 
  • R-Value Work: 0.252 
  • Space Group: P 3
Unit Cell:
Length (Å)Angle (°)
a = 142.987α = 90.00
b = 142.987β = 90.00
c = 67.655γ = 120.00
Software Package:
Software NamePurpose
DENZOdata reduction
AMoREphasing
CNSrefinement
SCALEPACKdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2003-05-27
    Type: Initial release
  • Version 1.1: 2008-04-29
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Non-polymer description, Version format compliance