1OAU image
Entry Detail
PDB ID:
1OAU
Keywords:
Title:
Fv Structure of the IgE SPE-7 in complex with DNP-Ser (immunising hapten)
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2003-01-21
Release Date:
2004-01-15
Method Details:
Experimental Method:
Resolution:
1.80 Å
R-Value Free:
0.26
R-Value Work:
0.22
R-Value Observed:
0.22
Space Group:
P 21 21 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:IMMUNOGLOBULIN E
Chain IDs:A (auth: H), B (auth: I), C (auth: J), D (auth: K)
Chain Length:122
Number of Molecules:4
Biological Source:MUS MUSCULUS
Polymer Type:polypeptide(L)
Description:IMMUNOGLOBULIN E
Chain IDs:E (auth: L), F (auth: M), G (auth: N), H (auth: O)
Chain Length:110
Number of Molecules:4
Biological Source:MUS MUSCULUS
Primary Citation
Antibody Multispecificity Mediated by Conformational Diversity
Science 299 1362 ? (2003)
PMID: 12610298 DOI: 10.1126/SCIENCE.1079731

Abstact

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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