5D8I

Engineering the Species-Specificity of an Inhibitory Antibody Targeting a Modulator of Tumor Stroma

5D8I の概要

• エントリーDOI: 10.2210/pdb5d8i/pdb
• 関連するPDBエントリー: 3Q6O
• 分子名称: Sulfhydryl oxidase 1 (2 entities in total)
• 機能のキーワード: enzyme, disulfide bonds, thioredoxin fold, oxidoreductase
• 由来する生物種: Mus musculus (Mouse)
• 細胞内の位置: Isoform 1: Golgi apparatus membrane ; Single-pass membrane protein . Isoform 2: Secreted. Isoform 3: Secreted. Isoform 4: Secreted: Q8BND5
• タンパク質・核酸の鎖数: 2
• 化学式量合計: 53183.99

構造登録者

Grossman, I.,Fass, D. (登録日: 2015-08-17, 公開日: 2016-02-10, 最終更新日: 2024-10-23)

主引用文献

Grossman, I.,Ilani, T.,Fleishman, S.J.,Fass, D.
Overcoming a species-specificity barrier in development of an inhibitory antibody targeting a modulator of tumor stroma.
Protein Eng.Des.Sel., 29:135-147, 2016

PubMed Abstract: The secreted disulfide catalyst Quiescin sulfhydryl oxidase-1 (QSOX1) affects extracellular matrix organization and is overexpressed in various adenocarcinomas and associated stroma. Inhibition of extracellular human QSOX1 by a monoclonal antibody decreased tumor cell migration in a cell co-culture model and hence may have therapeutic potential. However, the species specificity of the QSOX1 monoclonal antibody has been a setback in assessing its utility as an anti-metastatic agent in vivo, a common problem in the antibody therapy industry. We therefore used structurally guided engineering to expand the antibody species specificity, improving its affinity toward mouse QSOX1 by at least four orders of magnitude. A crystal structure of the re-engineered variant, complexed with its mouse antigen, revealed that the antibody accomplishes dual-species targeting through altered contacts between its heavy and light chains, plus replacement of bulky aromatics by flexible side chains and versatile water-bridged polar interactions. In parallel, we produced a surrogate antibody targeting mouse QSOX1 that exhibits a new QSOX1 inhibition mode. This set of three QSOX1 inhibitory antibodies is compatible with various mouse models for pre-clinical trials and biotechnological applications. In this study we provide insights into structural blocks to cross-reactivity and set up guideposts for successful antibody design and re-engineering.

PubMed: 26819240
DOI: 10.1093/protein/gzv067

実験手法

X-RAY DIFFRACTION (2.05 Å)