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Three-dimensional structure and antigen binding specificity of antibodies
D Tello1, S Spinelli, H Souchon
1URA 359 CNRS, Department of Immunology, Institut Pasteur, Paris, France.
Biochimie
|August 1, 1990
Summary
Antibody fragments and antigen complexes show specific interactions via complementary surfaces. Antigen recognition specificity arises from the precise fit between the antigenic determinant and the antibody binding site.
Area of Science:
- Immunochemistry
- Structural Biology
- Protein Crystallography
Background:
- Antibody fragments like Fab and Fv are crucial for antigen binding.
- Understanding antigen-antibody interactions is fundamental to immunology.
Purpose of the Study:
- To investigate the structural basis of antigen recognition by antibody fragments.
- To elucidate the role of complementarity in antigen-antibody interactions.
Main Methods:
- Immunochemical techniques were employed to study antibody fragments.
- Crystallographic analysis was used to determine the structures of complexes.
Main Results:
- Fab and Fv fragments form complexes with antigens (avian lysozymes), haptens, and anti-idiotopic Fabs.
- Antigen-antibody interactions occur through highly complementary surfaces without significant conformational changes.
- An antibody's idiotope determinant involves multiple complementarity-determining regions.
Conclusions:
- The specificity of antigen recognition is determined by the close complementarity between the antigenic determinant and the antibody combining site.
- Structural studies reveal minimal conformational changes upon antigen binding, highlighting pre-existing complementarity.