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3Q8C

Crystal structure of Protective Antigen W346F (pH 5.5)

3Q8C の概要
エントリーDOI10.2210/pdb3q8c/pdb
関連するPDBエントリー3q8a 3q8b 3q8e 3q8f
分子名称Protective antigen, CALCIUM ION (2 entities in total)
機能のキーワードprotective antigen; anthrax; ph stability, 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82809.95
構造登録者
Lovell, S.,Battaile, K.P.,Rajapaksha, M.,Janowiak, B.E.,Andra, K.K.,Bann, J.G. (登録日: 2011-01-06, 公開日: 2012-02-15, 最終更新日: 2023-09-13)
主引用文献Rajapaksha, M.,Lovell, S.,Janowiak, B.E.,Andra, K.K.,Battaile, K.P.,Bann, J.G.
pH effects on binding between the anthrax protective antigen and the host cellular receptor CMG2.
Protein Sci., 21:1467-1480, 2012
Cited by
PubMed Abstract: The anthrax protective antigen (PA) binds to the host cellular receptor capillary morphogenesis protein 2 (CMG2) with high affinity. To gain a better understanding of how pH may affect binding to the receptor, we have investigated the kinetics of binding as a function of pH to the full-length monomeric PA and to two variants: a 2-fluorohistidine-labeled PA (2-FHisPA), which is ∼1 pH unit more stable to variations in pH than WT, and an ∼1 pH unit less stable variant in which Trp346 in the domain 2β(3) -2β(4) loop is substituted with a Phe (W346F). We show using stopped-flow fluorescence that the binding rate increases as the pH is lowered for all proteins, with little influence on the rate of dissociation. In addition, we have crystallized PA and the two variants and examine the influence of pH on structure. In contrast to previous X-ray studies, the domain 2β(3) -2β(4) loop undergoes little change in structure from pH ∼8 to 5.5 for the WT protein, but for the 2-FHis labeled and W346F mutant there are changes in structure consistent with previous X-ray studies. In accord with pH stability studies, we find that the average B-factor values increase by ∼20-30% for all three proteins at low pH. Our results suggest that for the full-length PA, low pH increases the binding affinity, likely through a change in structure that favors a more "bound-like" conformation.
PubMed: 22855243
DOI: 10.1002/pro.2136
主引用文献が同じPDBエントリー
実験手法
X-RAY DIFFRACTION (2.85 Å)
構造検証レポート
Validation report summary of 3q8c
検証レポート(詳細版)ダウンロードをダウンロード

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件を2024-11-06に公開中

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