Download MendeleyStructural characterization of a human Fc fragment engineered for lack of effector functions.
Oganesyan, V., Gao, C., Shirinian, L., Wu, H., Dall'Acqua, W.F.(2008) Acta Crystallogr D Biol Crystallogr 64: 700-704
- PubMed: 18560159
- DOI: https://doi.org/10.1107/S0907444908007877
- Primary Citation of Related Structures:
3C2S - PubMed Abstract:
The first three-dimensional structure of a human Fc fragment genetically engineered for the elimination of its ability to mediate antibody-dependent cell-mediated cytotoxicity and complement-dependent cytotoxicity is reported. When introduced into the lower hinge and CH2 domain of human IgG1 molecules, the triple mutation L234F/L235E/P331S ('TM') causes a profound decrease in their binding to human CD64, CD32A, CD16 and C1q. Enzymatically produced Fc/TM fragment was crystallized and its structure was solved at a resolution of 2.3 A using molecular replacement. This study revealed that the three-dimensional structure of Fc/TM is very similar to those of other human Fc fragments in the experimentally visible region spanning residues 236-445. Thus, the dramatic broad-ranging effects of TM on IgG binding to several effector molecules cannot be explained in terms of major structural rearrangements in this portion of the Fc.
Organizational Affiliation:
Department of Antibody Discovery and Protein Engineering, MedImmune Inc., One MedImmune Way, Gaithersburg, MD 20878, USA.
