Biological Assembly 1  

 3D View: Structure | Electron Density

Global Symmetry: Cyclic - C4  (3D View)
Global Stoichiometry: Hetero 8-mer - A4B4 Pseudo Symmetry: Dihedral - D4  (3D View)
Pseudo Stoichiometry: Homo 8-mer - A8 

Biological assembly 1 assigned by authors and generated by PQS (software)

Macromolecule Content

• Total Structure Weight: 26.20 kDa 
• Atom Count: 1835 
• Residue Count: 230 
• Unique protein chains: 2

1OCW

Free conformation Ab2 of the IgE SPE-7

• DOI: 10.2210/pdb1OCW/pdb

• Classification: IMMUNE SYSTEM
• Organism(s): Mus musculus
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2003-02-11 Released: 2004-02-05 
• Deposition Author(s): James, L.C., Roversi, P., Tawfik, D.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.00 Å
• R-Value Free: 0.290 
• R-Value Observed: 0.266 

Literature

Antibody Multispecificity Mediated by Conformational Diversity

James, L.C., Roversi, P., Tawfik, D.

(2003) Science 299: 1362

• PubMed: 12610298 
• DOI: 10.1126/science.1079731
• Primary Citation of Related Structures:  
  1OAZ, 1OAY, 1OAX, 1OAU, 1OAR, 1OAQ, 1OCW


• PubMed Abstract: 
  

A single antibody was shown to adopt different binding-site conformations and thereby bind unrelated antigens. Analysis by both x-ray crystallography and pre-steady-state kinetics revealed an equilibrium between different preexisting isomers, one of which possessed a promiscuous, low-affinity binding site for aromatic ligands, including the immunizing hapten. A subsequent induced-fit isomerization led to high-affinity complexes with a deep and narrow binding site. A protein antigen identified by repertoire selection made use of an unrelated antibody isomer with a wide, shallow binding site. Conformational diversity, whereby one sequence adopts multiple structures and multiple functions, can increase the effective size of the antibody repertoire but may also lead to autoimmunity and allergy.

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Organizational Affiliation: 

Centre for Protein Engineering, Medical Research Council Centre, Hills Road, Cambridge CB2 2HQ, UK.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
IMMUNOGLOBULIN E	H	121	Mus musculus	Mutation(s): 0

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
IMMUNOGLOBULIN E	L	120	Mus musculus	Mutation(s): 0
Find proteins for P01724 (Mus musculus) Explore P01724  Go to UniProtKB:  P01724

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.00 Å
• R-Value Free: 0.290 
• R-Value Observed: 0.266 
• Space Group: I 4

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 79.545	α = 90
b = 79.545	β = 90
c = 67.703	γ = 90

Software Package:

Software Name	Purpose
SHELXL-97	refinement
MOSFLM	data reduction
SCALA	data scaling
AMoRE	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2003-02-11 
• Released Date: 2004-02-05 
Deposition Author(s): James, L.C., Roversi, P., Tawfik, D.

Revision History 

• Version 1.0: 2004-02-05
  Type: Initial release
  
• Version 1.1: 2013-10-30
  Changes: Derived calculations, Other, Source and taxonomy, Version format compliance