6ANA

LL2 Fab in complex with anti-Kappa VHH domain

6ANA の概要

• エントリーDOI: 10.2210/pdb6ana/pdb
• 分子名称: anti Kappa VHH domain, LL2 Fab Heavy Chain, LL2 Fab Light Chain, ... (5 entities in total)
• 機能のキーワード: fab, antibody, cd22, vhh domain, immune system
• 由来する生物種: Lama glama; 詳細
• タンパク質・核酸の鎖数: 3
• 化学式量合計: 58794.53

構造登録者

Sicard, T.,Ereno Orbea, J.,Julien, J.-P. (登録日: 2017-08-12, 公開日: 2018-01-31, 最終更新日: 2024-11-20)

主引用文献

Ereno-Orbea, J.,Sicard, T.,Cui, H.,Carson, J.,Hermans, P.,Julien, J.P.
Structural Basis of Enhanced Crystallizability Induced by a Molecular Chaperone for Antibody Antigen-Binding Fragments.
J. Mol. Biol., 430:322-336, 2018

PubMed Abstract: Monoclonal antibodies constitute one of the largest groups of drugs to treat cancers and immune disorders, and are guiding the design of vaccines against infectious diseases. Fragments antigen-binding (Fabs) have been preferred over monoclonal antibodies for the structural characterization of antibody-antigen complexes due to their relatively low flexibility. Nonetheless, Fabs often remain challenging to crystallize because of the surface characteristics of complementary determining regions and the residual flexibility in the hinge region between the variable and constant domains. Here, we used a variable heavy-chain (VH) domain specific for the human kappa light chain to assist in the structure determination of three therapeutic Fabs that were recalcitrant to crystallization on their own. We show that this ligand alters the surface properties of the antibody-ligand complex and lowers its aggregation temperature to favor crystallization. The VH crystallization chaperone also restricts the flexible hinge of Fabs to a narrow range of angles, and so independently of the variable region. Our findings contribute a valuable approach to antibody structure determination and provide biophysical insight into the principles that govern the crystallization of macromolecules.

PubMed: 29277294
DOI: 10.1016/j.jmb.2017.12.010

実験手法

X-RAY DIFFRACTION (1.7 Å)