2ATY

Complement receptor chimaeric conjugate CR2-Ig


Experimental Data Snapshot

  • Method: SOLUTION SCATTERING

wwPDB Validation   3D Report Full Report


This is version 1.6 of the entry. See complete history


Literature

Extended Flexible Linker Structures in the Complement Chimaeric Conjugate CR2-Ig by Scattering, Analytical Ultracentrifugation and Constrained Modelling: Implications for Function and Therapy.

Gilbert, H.E.Aslam, M.Guthridge, J.M.Holers, V.M.Perkins, S.J.

(2006) J Mol Biol 356: 397-412

  • DOI: https://doi.org/10.1016/j.jmb.2005.11.050
  • Primary Citation of Related Structures:  
    2ATY

  • PubMed Abstract: 

    Complement receptor 2 (CR2; CD21) is a membrane-bound regulator of complement activation, being comprised of 15 or 16 short complement repeat (SCR) domains. A recombinant glycosylated human CR2 SCR 1-2 domain pair was engineered with the Fc fragment of a mouse IgG1 antibody to create a chimaera CR2-Ig containing the major ligand binding domains. Such a chimaera has therapeutic potential as a complement inhibitor or immune modulator. X-ray and neutron scattering and analytical ultracentrifugation identified its domain structure in solution, and provided a comparison with controversial folded-back crystal structures for deglycosylated CR2 SCR 1-2. The radius of gyration R(G) of CR2-Ig was determined to be 5.39(+/-0.14) nm and 5.29(+/-0.01) nm by X-ray and neutron scattering, respectively. The maximum dimension of CR2-Ig was determined to be 17 nm. The molecular mass of CR2-Ig ranged between 101,000 Da and 107,000 Da as determined by neutron scattering and sedimentation equilibrium, in good agreement with the sequence-derived value of 106,600 Da. Sedimentation velocity gave a sedimentation coefficient of 4.49(+/-0.11) S. Stereochemically complete models for CR2-Ig were constructed from crystal structures for the CR2 SCR 1-2 and mouse IgG1 Fc fragments. The two SCR domains and the Fc fragment were joined by randomised conformational peptides. The analysis of 35,000 possible CR2-Ig models showed that only those models in which the two SCR domains were arranged in an open V-shape in random orientations about the Fc fragment accounted for the scattering and sedimentation data. It was not possible to define one single conformational family of Fab-like fragment relative to the Fc fragment. This flexibility is attributed to the relatively long linker sequence and the absence of the antibody light chain from CR2-Ig. The modelling also confirmed that the structure of CR2 SCR 1-2 is more extended in solution than in its crystal structure.


  • Organizational Affiliation

    Department of Biochemistry and Molecular Biology, Darwin Building, University College London, UK.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Complement receptor chimeric conjugate CR2-Ig
A, B
376Homo sapiensMus musculus
This entity is chimeric
Mutation(s): 0 
Gene Names: CR2C3DRIghg1Igh-4
UniProt & NIH Common Fund Data Resources
Find proteins for P01868 (Mus musculus)
Explore P01868 
Go to UniProtKB:  P01868
Find proteins for P20023 (Homo sapiens)
Explore P20023 
Go to UniProtKB:  P20023
PHAROS:  P20023
GTEx:  ENSG00000117322 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupsP01868P20023
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION SCATTERING

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2006-01-31
    Type: Initial release
  • Version 1.1: 2008-05-01
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2017-06-21
    Changes: Database references, Source and taxonomy
  • Version 1.4: 2017-10-11
    Changes: Refinement description
  • Version 1.5: 2018-06-13
    Changes: Data collection
  • Version 1.6: 2024-02-14
    Changes: Data collection, Database references