5K64

Crystal structure of VEGF binding IgG1-Fc (Fcab 448)

5K64 の概要

• エントリーDOI: 10.2210/pdb5k64/pdb
• 分子名称: Ig gamma-1 chain C region, alpha-D-mannopyranose-(1-3)-[alpha-D-mannopyranose-(1-6)]beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose, 2-acetamido-2-deoxy-beta-D-glucopyranose-(1-2)-alpha-D-mannopyranose-(1-6)-[alpha-D-mannopyranose-(1-3)]beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose, ... (6 entities in total)
• 機能のキーワード: immune system, antibody engineering, immunoglobulin g1, fc fragment, glycosylations, ch3 domain, fcab, vegf, vascular endothelial growth factor
• 由来する生物種: Homo sapiens (Human)
• 細胞内の位置: Secreted : P01857
• タンパク質・核酸の鎖数: 2
• 化学式量合計: 53943.01

構造登録者

Humm, A.,Lobner, E.,Kitzmuller, M.,Mlynek, G.,Obinger, C.,Djinovic-Carugo, K. (登録日: 2016-05-24, 公開日: 2017-09-06, 最終更新日: 2024-11-13)

主引用文献

Lobner, E.,Humm, A.S.,Mlynek, G.,Kubinger, K.,Kitzmuller, M.,Traxlmayr, M.W.,Djinovic-Carugo, K.,Obinger, C.
Two-faced Fcab prevents polymerization with VEGF and reveals thermodynamics and the 2.15 angstrom crystal structure of the complex.
MAbs, 9:1088-1104, 2017

PubMed Abstract: Fcabs (Fc domain with antigen-binding sites) are promising novel therapeutics. By engineering of the C-terminal loops of the CH3 domains, 2 antigen binding sites can be inserted in close proximity. To elucidate the binding mode(s) between homodimeric Fcabs and small homodimeric antigens, the interaction between the Fcabs 448 and CT6 (having the AB, CD and EF loops and the C-termini engineered) with homodimeric VEGF was investigated. The crystal structures of these Fcabs, which form polymers with the antigen VEGF in solution, were determined. However, construction of heterodimeric Fcabs (JanusFcabs: one chain Fc-wt, one chain VEGF-binding) results in formation of distinct JanusFcab-VEGF complexes (2:1), which allowed elucidation of the crystal structure of the JanusCT6-VEGF complex at 2.15 Å resolution. VEGF binding to Janus448 and JanusCT6 is shown to be entropically unfavorable, but enthalpically favorable. Structure-function relationships are discussed with respect to Fcab design and engineering strategies.

PubMed: 28816592
DOI: 10.1080/19420862.2017.1364825

実験手法

X-RAY DIFFRACTION (2.44 Å)