1igt Citations

Refined structure of an intact IgG2a monoclonal antibody.

Biochemistry 36 1581-97 (1997)
Cited: 185 times
EuropePMC logo PMID: 9048542

Abstract

The structure of an intact, anti-canine lymphoma monoclonal antibody (Mab231) was determined by molecular replacement and refined in a triclinic cell to an R-value of 20.9%, using synchrotron diffraction data from 2.8 to 20 A resolution. All segments of the antibody, including the hinge region and carbohydrate component, are visible in electron density maps. There is no overall symmetry to the antibody, as the Fc is disposed in an entirely oblique manner with respect to the Fabs. The CH2 and CH3 domains do, however, possess a nearly exact, local 2-fold relationship. The Fab segments are related by a second, independent, local dyad axis, exact only with respect to constant domains. Variable domains exhibit no symmetry relationship as a consequence of the 16 degrees difference in Fab elbow angles. Variable domain pair associations VL:VH for the Fabs are virtually the same, and corresponding CDRs of the two Fabs also are nearly identical in structure. CDR-H3 displays the greatest difference. Hypervariable loops of both Fabs are involved in contacts with symmetry-related Fc segments at the CH2-CH3 switch junction, suggesting a "complex" structure. The hinge segment connecting Fabs with the Fc is quite extended and exhibits thermal factors indicative of a high degree of mobility. It consists of a well-defined upper hinge that partially maintains dyad symmetry and a fairly rigid core bounded above and below by fluid polypeptides that provide segmental flexibility. This structure represents the first visualization by X-ray analysis of a murine Fc segment, and its CH2 domains exhibit substantial rigid body conformational changes with respect to the human Fc used as an initial molecular replacement model. The oligosaccharides were found by difference Fourier syntheses to be very similar to those of the free human Fc fragment, although differences are present in the terminal residues. The detailed structure of the IgG presented here, and the distribution of effector binding sites, appears consistent with effector activation mechanisms involving translocation and/or aggregation of the Fc following antigen binding by the Fabs.

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