2NUD

The structure of the type III effector AvrB complexed with a high-affinity RIN4 peptide

2NUD の概要

• エントリーDOI: 10.2210/pdb2nud/pdb
• 関連するPDBエントリー: 1NH1 2NUN
• 分子名称: Avirulence B protein, RPM1-interacting protein 4, 2-AMINO-2-HYDROXYMETHYL-PROPANE-1,3-DIOL, ... (5 entities in total)
• 機能のキーワード: avrb rin4 high-affinity crystal structure, toxin-protein binding complex, toxin/protein binding
• 由来する生物種: Pseudomonas syringae pv. glycinea; 詳細
• 細胞内の位置: Endomembrane system; Peripheral membrane protein: Q8GYN5
• タンパク質・核酸の鎖数: 4
• 化学式量合計: 81188.01

構造登録者

Singer, A.U.,Desveaux, D.,Wu, A.J.,McNulty, B.,Sondek, J.,Dangl, J.L. (登録日: 2006-11-09, 公開日: 2007-05-22, 最終更新日: 2023-08-30)

主引用文献

Desveaux, D.,Singer, A.U.,Wu, A.J.,McNulty, B.C.,Musselwhite, L.,Nimchuk, Z.,Sondek, J.,Dangl, J.L.
Type III Effector Activation via Nucleotide Binding, Phosphorylation, and Host Target Interaction.
Plos Pathog., 3:e48-, 2007

PubMed Abstract: The Pseudomonas syringae type III effector protein avirulence protein B (AvrB) is delivered into plant cells, where it targets the Arabidopsis RIN4 protein (resistance to Pseudomonas maculicula protein 1 [RPM1]-interacting protein). RIN4 is a regulator of basal host defense responses. Targeting of RIN4 by AvrB is recognized by the host RPM1 nucleotide-binding leucine-rich repeat disease resistance protein, leading to accelerated defense responses, cessation of pathogen growth, and hypersensitive host cell death at the infection site. We determined the structure of AvrB complexed with an AvrB-binding fragment of RIN4 at 2.3 A resolution. We also determined the structure of AvrB in complex with adenosine diphosphate bound in a binding pocket adjacent to the RIN4 binding domain. AvrB residues important for RIN4 interaction are required for full RPM1 activation. AvrB residues that contact adenosine diphosphate are also required for initiation of RPM1 function. Nucleotide-binding residues of AvrB are also required for its phosphorylation by an unknown Arabidopsis protein(s). We conclude that AvrB is activated inside the host cell by nucleotide binding and subsequent phosphorylation and, independently, interacts with RIN4. Our data suggest that activated AvrB, bound to RIN4, is indirectly recognized by RPM1 to initiate plant immune system function.

PubMed: 17397263
DOI: 10.1371/journal.ppat.0030048

実験手法

X-RAY DIFFRACTION (2.3 Å)