3TEZ

Crystal Structure of Anthrax Protective Antigen Mutant S337C N664C and dithiolacetone modified to 1.8-A resolution

3TEZ の概要

• エントリーDOI: 10.2210/pdb3tez/pdb
• 関連するPDBエントリー: 3TEW 3TEX 3TEY
• 分子名称: Protective antigen, CALCIUM ION, 2-METHOXYETHANOL, ... (5 entities in total)
• 機能のキーワード: translocase, protein transport, toxin
• 由来する生物種: Bacillus anthracis (anthrax,anthrax bacterium)
• 細胞内の位置: Secreted, extracellular space: P13423
• タンパク質・核酸の鎖数: 1
• 化学式量合計: 83064.35

構造登録者

Feld, G.K.,Krantz, B.A. (登録日: 2011-08-15, 公開日: 2011-10-26, 最終更新日: 2025-03-26)

主引用文献

Feld, G.K.,Kintzer, A.F.,Tang, I.I.,Thoren, K.L.,Krantz, B.A.
Domain flexibility modulates the heterogeneous assembly mechanism of anthrax toxin protective antigen.
J.Mol.Biol., 415:159-174, 2012

PubMed Abstract: The three protein components of anthrax toxin are nontoxic individually, but they form active holotoxin complexes upon assembly. The role of the protective antigen (PA) component of the toxin is to deliver two other enzyme components, lethal factor and edema factor, across the plasma membrane and into the cytoplasm of target cells. PA is produced as a proprotein, which must be proteolytically activated; generally, cell surface activation is mediated by a furin family protease. Activated PA can then assemble into one of two noninterconverting oligomers, a homoheptamer and a homooctamer, which have unique properties. Herein we describe molecular determinants that influence the stoichiometry of PA in toxin complexes. By tethering PA domain 4 (D4) to domain 2 with two different-length cross-links, we can control the relative proportions of PA heptamers and octamers. The longer cross-link favors octamer formation, whereas the shorter one favors formation of the heptamer. X-ray crystal structures of PA (up to 1.45 Å resolution), including these cross-linked PA constructs, reveal that a hinge-like movement of D4 correlates with the relative preference for each oligomeric architecture. Furthermore, we report the conformation of the flexible loop containing the furin cleavage site and show that, for efficient processing, the furin site cannot be moved ~5 or 6 residues within the loop. We propose that there are different orientations of D4 relative to the main body of PA that favor the formation of either the heptamer or the octamer.

PubMed: 22063095
DOI: 10.1016/j.jmb.2011.10.035

実験手法

X-RAY DIFFRACTION (1.83 Å)