1FBI

CRYSTAL STRUCTURE OF A CROSS-REACTION COMPLEX BETWEEN FAB F9.13.7 AND GUINEA-FOWL LYSOZYME

1FBI の概要

• エントリーDOI: 10.2210/pdb1fbi/pdb
• 分子名称: IGG1 F9.13.7 FAB (LIGHT CHAIN), IGG1 F9.13.7 FAB (HEAVY CHAIN), GUINEA FOWL LYSOZYME (3 entities in total)
• 機能のキーワード: complex (antibody-antigen), complex (antibody-antigen) complex, complex (antibody/antigen)
• 由来する生物種: Mus musculus (house mouse); 詳細
• 細胞内の位置: Isoform Secreted: Secreted: P01868; Secreted: P00704
• タンパク質・核酸の鎖数: 6
• 化学式量合計: 123593.65

構造登録者

Lescar, J.,Alzari, P.M. (登録日: 1995-01-19, 公開日: 1995-02-27, 最終更新日: 2024-11-20)

主引用文献

Lescar, J.,Pellegrini, M.,Souchon, H.,Tello, D.,Poljak, R.J.,Peterson, N.,Greene, M.,Alzari, P.M.
Crystal structure of a cross-reaction complex between Fab F9.13.7 and guinea fowl lysozyme.
J.Biol.Chem., 270:18067-18076, 1995

PubMed Abstract: The crystal structure of the complex between the cross-reacting antigen Guinea fowl lysozyme and the Fab from monoclonal antibody F9.13.7, raised against hen egg lysozyme, has been determined by x-ray diffraction to 3-A resolution. The antibody interacts with exposed residues of an alpha-helix and surrounding loops adjacent to the lysozyme active site cleft. The epitope of lysozyme bound by antibody F9.13.7 overlaps almost completely with that bound by antibody HyHEL10; the same 12 residues of the antigen interact with the two antibodies. The antibodies, however, have different combining sites with no sequence homology at any of their complementarity-determining regions and show a dissimilar pattern of cross-reactivity with heterologous antigens. Side chain mobility of epitope residues contributes to confer steric and electrostatic complementarity to differently shaped combining sites, allowing functional mimicry to occur. The capacity of two antibodies that have different fine specificities to bind the same area of the antigen emphasizes the operational character of the definition of an antigenic determinant. This example demonstrates that degenerate binding of the same structural motif does not require the existence of sequence homology or other chemical similarities between the different binding sites.

PubMed: 7629116
DOI: 10.1074/jbc.270.30.18067

実験手法

X-RAY DIFFRACTION (3 Å)