6TFK

Vip3Aa toxin structure

6TFK の概要

• エントリーDOI: 10.2210/pdb6tfk/pdb
• 関連するPDBエントリー: 6TFJ
• EMDBエントリー: 10492 10493
• 分子名称: Vegetative insecticidal protein, MAGNESIUM ION (2 entities in total)
• 機能のキーワード: vip3aa, toxin, beta prism, insecticidal protein, vip3
• 由来する生物種: Bacillus thuringiensis
• タンパク質・核酸の鎖数: 4
• 化学式量合計: 355075.52

構造登録者

Nunez-Ramirez, R.,Huesa, J.,Bel, Y.,Ferre, J.,Casino, P.,Arias-Palomo, E. (登録日: 2019-11-14, 公開日: 2020-08-12, 最終更新日: 2024-05-22)

主引用文献

Nunez-Ramirez, R.,Huesa, J.,Bel, Y.,Ferre, J.,Casino, P.,Arias-Palomo, E.
Molecular architecture and activation of the insecticidal protein Vip3Aa from Bacillus thuringiensis.
Nat Commun, 11:3974-3974, 2020

PubMed Abstract: Bacillus thuringiensis Vip3 (Vegetative Insecticidal Protein 3) toxins are widely used in biotech crops to control Lepidopteran pests. These proteins are produced as inactive protoxins that need to be activated by midgut proteases to trigger cell death. However, little is known about their three-dimensional organization and activation mechanism at the molecular level. Here, we have determined the structures of the protoxin and the protease-activated state of Vip3Aa at 2.9 Å using cryo-electron microscopy. The reconstructions show that the protoxin assembles into a pyramid-shaped tetramer with the C-terminal domains exposed to the solvent and the N-terminal region folded into a spring-loaded apex that, after protease activation, drastically remodels into an extended needle by a mechanism akin to that of influenza haemagglutinin. These results provide the molecular basis for Vip3 activation and function, and serves as a strong foundation for the development of more efficient insecticidal proteins.

PubMed: 32769995
DOI: 10.1038/s41467-020-17758-5

実験手法

ELECTRON MICROSCOPY (2.9 Å)