9KLT

Crystal structure of a Streptococcal protein G B1 mutant

9KLT の概要

• エントリーDOI: 10.2210/pdb9klt/pdb
• 分子名称: Protein LG, 4-(2-HYDROXYETHYL)-1-PIPERAZINE ETHANESULFONIC ACID (2 entities in total)
• 機能のキーワード: protein g b1, 3d domain-swapped dimer, immune system
• 由来する生物種: Finegoldia magna
• タンパク質・核酸の鎖数: 1
• 化学式量合計: 7504.30

構造登録者

Shiga, S.,Watanabe, H.,Honda, S. (登録日: 2024-11-15, 公開日: 2026-01-28)

主引用文献

Shiga, S.,Watanabe, H.,Makabe, K.,Honda, S.
Regulating the orientation of homobivalent small binders through 3D domain-swapping design.
J.Biol.Chem., 302:111053-111053, 2025

PubMed Abstract: Homobivalent small binders represent bioactive dimeric proteins constructed by linking nanobodies or other small binders. As binding domain orientation in these dimeric binders affects binding affinity, expanding the orientation regulation techniques is crucial for optimizing their performance. Here, we report a 3D domain-swapping design as a genetic engineering approach to regulate the orientation of homobivalent small binders. We aimed to regulate B1 domain orientation of protein G as a model binder. By inserting single cysteine-containing polyproline sequences into loops located at the C- and N-terminal sides of the tertiary structure, we successfully designed 3D domain-swapped dimers with tail-to-tail and head-to-head orientations. Notably, the head-to-head-oriented dimer demonstrated potential as a functional homobivalent small binder. Our results highlight the applicability of the 3D domain-swapping design for regulating the orientation of homobivalent small binders and establish a foundation for developing 3D domain-swapped dimers.

PubMed: 41391770
DOI: 10.1016/j.jbc.2025.111053

実験手法

X-RAY DIFFRACTION (2.88 Å)