1ZLD

Crystal structure of a RGD-containing host-selective toxin: Pyrenophora tritici-repentis Ptr ToxA

1ZLD の概要

• エントリーDOI: 10.2210/pdb1zld/pdb
• 関連するPDBエントリー: 1ZLE
• 分子名称: Ptr necrosis toxin, SULFATE ION (3 entities in total)
• 機能のキーワード: beta-sandwich; rgd-motif, toxin
• 由来する生物種: Pyrenophora tritici-repentis
• タンパク質・核酸の鎖数: 1
• 化学式量合計: 13399.88

構造登録者

Sarma, G.N.,Manning, V.A.,Ciuffetti, L.M.,Karplus, P.A. (登録日: 2005-05-06, 公開日: 2005-08-16, 最終更新日: 2024-11-06)

主引用文献

Sarma, G.N.,Manning, V.A.,Ciuffetti, L.M.,Karplus, P.A.
Structure of Ptr ToxA: An RGD-Containing Host-Selective Toxin from Pyrenophora tritici-repentis
Plant Cell, 17:3190-3202, 2005

PubMed Abstract: Tan spot of wheat (Triticum aestivum), caused by the fungus Pyrenophora tritici-repentis, has significant agricultural and economic impact. Ptr ToxA (ToxA), the first discovered proteinaceous host-selective toxin, is produced by certain P. tritici-repentis races and is necessary and sufficient to cause cell death in sensitive wheat cultivars. We present here the high-resolution crystal structure of ToxA in two different crystal forms, providing four independent views of the protein. ToxA adopts a single-domain, beta-sandwich fold of novel topology. Mapping of the existing mutation data onto the structure supports the hypothesized importance of an Arg-Gly-Asp (RGD) and surrounding sequence. Its occurrence in a single, solvent-exposed loop in the protein suggests that it is directly involved in recognition events required for ToxA action. Furthermore, the ToxA structure reveals a surprising similarity with the classic mammalian RGD-containing domain, the fibronectin type III (FnIII) domain: the two topologies are related by circular permutation. The similar topologies and the positional conservation of the RGD-containing loop raises the possibility that ToxA is distantly related to mammalian FnIII proteins and that to gain entry it binds to an integrin-like receptor in the plant host.

PubMed: 16214901
DOI: 10.1105/tpc.105.034918

実験手法

X-RAY DIFFRACTION (1.65 Å)