1P2C

crystal structure analysis of an anti-lysozyme antibody

Summary for 1P2C

• Entry DOI: 10.2210/pdb1p2c/pdb
• Related: 1MLB 1MLC
• Descriptor: light chain anti-lysozyme antibody F10.6.6, heavy chain VH+CH1 anti-lysozyme antibody F10.6.6, Lysozyme C, ... (4 entities in total)
• Functional Keywords: monoclonal antibody igg1, kappa antibody-antigen complex, immune system-hydrolase complex, immune system/hydrolase
• Biological source: Mus musculus (house mouse); More
• Cellular location: Secreted: P00698
• Total number of polymer chains: 6
• Total formula weight: 122137.65

Authors

Cauerhff, A.,Goldbaum, F.A.,Braden, B.C. (deposition date: 2003-04-15, release date: 2004-02-17, Last modification date: 2024-10-09)

Primary citation

Cauerhff, A.,Goldbaum, F.A.,Braden, B.C.
Structural mechanism for affinity maturation of an anti-lysozyme antibody.
Proc.Natl.Acad.Sci.USA, 101:3539-3544, 2004

PubMed Abstract: In the immune response against a typical T cell-dependent protein antigen, the affinity maturation process is fast and is associated with the early class switch from IgM to IgG. As such, a comprehension of the molecular basis of affinity maturation could be of great importance in biomedical and biotechnological applications. Affinity maturation of anti-protein antibodies has been reported to be the result of small structural changes, mostly confined to the periphery of the antigen-combining site. However, little is understood about how these small structural changes account for the increase in the affinity toward the antigen. Herein, we present the three-dimensional structure of the Fab fragment from BALB/c mouse mAb F10.6.6 in complex with the antigen lysozyme. This antibody was obtained from a long-term exposure to the antigen. mAb F10.6.6, and the previously described antibody D44.1, are the result of identical or nearly identical somatic recombination events. However, different mutations in the framework and variable regions result in an approximately 10(3) higher affinity for the F10.6.6 antibody. The comparison of the three-dimensional structures of these Fab-lysozyme complexes reveals that the affinity maturation produces a fine tuning of the complementarity of the antigen-combining site toward the epitope, explaining at the molecular level how the immune system is able to increase the affinity of an anti-protein antibody to subnanomolar levels.

PubMed: 14988501
DOI: 10.1073/pnas.0400060101

Experimental method

X-RAY DIFFRACTION (2 Å)