1IGY

STRUCTURE OF IMMUNOGLOBULIN


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.20 Å
  • R-Value Free: 0.327 
  • R-Value Work: 0.211 
  • R-Value Observed: 0.211 

wwPDB Validation   3D Report Full Report


This is version 2.1 of the entry. See complete history


Literature

Crystallographic structure of an intact IgG1 monoclonal antibody.

Harris, L.J.Skaletsky, E.McPherson, A.

(1998) J Mol Biol 275: 861-872

  • DOI: https://doi.org/10.1006/jmbi.1997.1508
  • Primary Citation of Related Structures:  
    1IGY

  • PubMed Abstract: 

    The structure of an intact monoclonal antibody for phenobarbital, subclass IgG1, has been determined to 3.2 A resolution by X-ray crystallography. The molecule was visualized in a monoclinic unit cell having an entire immunoglobulin as the asymmetric unit. The two Fab segments, both with elbow angles of 155 degrees , were related by a rotation of 179.7 degrees plus a translation along the approximate dyad of 9 A. This is the first observation of such an Fab translation in a structurally defined antibody. The approximate 2-fold of the Fc was independent of that relating Fabs, making an angle of 107 degrees with the Fab dyad. The angle between long axes of the Fabs was 115 degrees, the most acute angle yet observed, yielding a distorted Y shaped molecule. This is in contrast to the distorted T shape of the only other intact IgG (2a) whose complete structure is known. Primary lattice interactions arise through formation of VH antiparallel beta ribbons whose strands are contributed by pseudo dyad related H2, and by L3 hypervariable loops from neighboring molecules. While one CH2 domain was mobile, Fabs and three domains of the Fc were well defined, as were hinge polypeptides connecting Fabs to the Fc, and the covalently attached oligosaccharides. Direct interactions are observed between hinge polypeptides, the glycosylated loop of one CH2 domain, and the oligosaccharide. Lattice interactions clearly influence, perhaps even determine the overall conformation of the antibody observed in this crystal. Comparison of this IgG1 with previously determined intact antibody structures extends the conformational range arising from segmental flexibility.


  • Organizational Affiliation

    Department of Molecular Biology & Biochemistry, University of California, Irvine, CA 92697, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
IGG1 INTACT ANTIBODY MAB61.1.3
A, C
213Mus musculusMutation(s): 0 
UniProt
Find proteins for P01837 (Mus musculus)
Explore P01837 
Go to UniProtKB:  P01837
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP01837
Sequence Annotations
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
IGG1 INTACT ANTIBODY MAB61.1.3
B, D
434Mus musculusMutation(s): 0 
UniProt
Find proteins for P01869 (Mus musculus)
Explore P01869 
Go to UniProtKB:  P01869
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP01869
Sequence Annotations
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  • Reference Sequence
Oligosaccharides

Help

Entity ID: 3
MoleculeChains Length2D Diagram Glycosylation3D Interactions
beta-D-galactopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-2)-alpha-D-mannopyranose-(1-6)-[2-acetamido-2-deoxy-beta-D-glucopyranose-(1-2)-alpha-D-mannopyranose-(1-3)]beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-alpha-D-glucopyranose-(1-4)-[beta-L-fucopyranose-(1-6)]2-acetamido-2-deoxy-beta-D-glucopyranose
E
9N-Glycosylation
Glycosylation Resources
GlyTouCan:  G93680CK
GlyCosmos:  G93680CK
GlyGen:  G93680CK
Entity ID: 4
MoleculeChains Length2D Diagram Glycosylation3D Interactions
beta-D-galactopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-2)-alpha-D-mannopyranose-(1-6)-[2-acetamido-2-deoxy-beta-D-glucopyranose-(1-2)-alpha-D-mannopyranose-(1-3)]beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-alpha-D-glucopyranose-(1-4)-[alpha-L-fucopyranose-(1-6)]2-acetamido-2-deoxy-beta-D-glucopyranose
F
9N-Glycosylation
Glycosylation Resources
GlyTouCan:  G27262LH
GlyCosmos:  G27262LH
GlyGen:  G27262LH
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.20 Å
  • R-Value Free: 0.327 
  • R-Value Work: 0.211 
  • R-Value Observed: 0.211 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 66.65α = 90
b = 190.66β = 109.66
c = 73.1γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
X-PLORmodel building
X-PLORrefinement
X-PLORphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1998-04-15
    Type: Initial release
  • Version 1.1: 2008-03-03
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Non-polymer description, Version format compliance
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Advisory, Atomic model, Data collection, Database references, Derived calculations, Structure summary
  • Version 2.1: 2023-08-09
    Changes: Advisory, Database references, Refinement description, Structure summary