2VSD

crystal structure of CHIR-AB1


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.82 Å
  • R-Value Free: 0.247 
  • R-Value Work: 0.207 
  • R-Value Observed: 0.210 

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Literature

The Crystal Structure of Chir-Ab1: A Primordial Avian Classical Fc Receptor.

Arnon, T.I.Kaiser, J.T.West, A.P.Olson, R.Diskin, R.Viertlboeck, B.C.Gobel, T.W.Bjorkman, P.J.

(2008) J Mol Biol 381: 1012

  • DOI: 10.1016/j.jmb.2008.06.082
  • Primary Citation of Related Structures:  
    2VSD

  • PubMed Abstract: 
  • CHIR-AB1 is a newly identified avian immunoglobulin (Ig) receptor that includes both activating and inhibitory motifs and was therefore classified as a potentially bifunctional receptor. Recently, CHIR-AB1 was shown to bind the Fc region of chicken IgY a ...

    CHIR-AB1 is a newly identified avian immunoglobulin (Ig) receptor that includes both activating and inhibitory motifs and was therefore classified as a potentially bifunctional receptor. Recently, CHIR-AB1 was shown to bind the Fc region of chicken IgY and to induce calcium mobilization via association with the common gamma-chain, a subunit that transmits signals upon ligation of many different immunoreceptors. Here we describe the 1.8-A-resolution crystal structure of the CHIR-AB1 ectodomain. The receptor ectodomain consists of a single C2-type Ig domain resembling the Ig-like domains found in mammalian Fc receptors such as FcgammaRs and FcalphaRI. Unlike these receptors and other monomeric Ig superfamily members, CHIR-AB1 crystallized as a 2-fold symmetrical homodimer that bears no resemblance to variable or constant region dimers in an antibody. Analytical ultracentrifugation demonstrated that CHIR-AB1 exists as a mixture of monomers and dimers in solution, and equilibrium gel filtration revealed a 2:1 receptor/ligand binding stoichiometry. Measurement of the 1:1 CHIR-AB1/IgY interaction affinity indicates a relatively low affinity complex, but a 2:1 CHIR-AB1/IgY interaction allows an increase in apparent affinity due to avidity effects when the receptor is tethered to a surface. Taken together, these results add to the structural understanding of Fc receptors and their functional mechanisms.


    Organizational Affiliation

    Division of Biology, 114-96 and Howard Hughes Medical Institute, California Institute of Technology, Pasadena, CA 91125, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
CHIR AB1 A105Gallus gallusMutation(s): 0 
Gene Names: RCJMB04_19p13
Find proteins for Q5ZJ90 (Gallus gallus)
Explore Q5ZJ90 
Go to UniProtKB:  Q5ZJ90
Protein Feature View
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  • Reference Sequence
Oligosaccharides

Help

Entity ID: 2
MoleculeChainsChain Length2D Diagram Glycosylation3D Interactions
beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose
B
3 N-Glycosylation Oligosaccharides Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.82 Å
  • R-Value Free: 0.247 
  • R-Value Work: 0.207 
  • R-Value Observed: 0.210 
  • Space Group: P 31 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 63.695α = 90
b = 63.695β = 90
c = 55.453γ = 120
Software Package:
Software NamePurpose
PHASERphasing
AMoREphasing
REFMACrefinement

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2008-07-29
    Type: Initial release
  • Version 1.1: 2011-05-08
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 2.0: 2019-09-11
    Changes: Atomic model, Data collection, Derived calculations, Experimental preparation, Non-polymer description, Structure summary
  • Version 3.0: 2019-10-23
    Changes: Advisory, Atomic model, Data collection, Derived calculations, Non-polymer description, Other, Structure summary
  • Version 4.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Advisory, Atomic model, Data collection, Derived calculations, Structure summary