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© Institut Pasteur
Cells infected for 24 hrs with C. Trachomatis. The cell nuclei are labelled in blue, the bacteria appear yellow, within the inclusion lumen. A bacterial protein secreted out the inclusion into the host cytoplasm id labelled in red.
Publication : The EMBO journal

Three-dimensional structure determination of an anti-2-phenyloxazolone antibody: the role of somatic mutation and heavy/light chain pairing in the maturation of an immune response

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in The EMBO journal - 01 Dec 1990

Alzari PM, Spinelli S, Mariuzza RA, Boulot G, Poljak RJ, Jarvis JM, Milstein C

Link to Pubmed [PMID] – 2123450

EMBO J. 1990 Dec;9(12):3807-14

The three-dimensional structure of the Fab fragment of an anti-2-phenyloxazolone monoclonal antibody (NQ10/12.5) in its native and complexed forms has been determined at 2.8 and 3.0 A resolution, respectively. Identification of hapten-contacting residues has allowed us to evaluate the contribution of individual somatic point mutations to maturation of the immune response. In particular, amino acid residues 34 and 36 of the light chain, which are frequently mutated in antibodies with increased affinity for 2-phenyloxazolone, are shown to interact directly with the hapten. We propose that the strict maintenance of certain amino acid sequences at the potentially highly variable VL-JL and VH-D-JH junctions observed among anti-2-phenyloxazolone antibodies is due largely to structural constraints related to antigen recognition. Finally, the three-dimensional model of NQ10/12.5, which uses the typical light chain of primary response anti-2-phenyloxazolone antibodies but a different heavy chain, allows an understanding of how, by preserving key contact residues, a given heavy chain may be replaced by another, apparently unrelated one, without loss of hapten binding activity and why the V kappa Ox1 germline gene is so frequently selected amongst the other known members of this family.

http://www.ncbi.nlm.nih.gov/pubmed/2123450