| Autor: |
Park, Ae Ran, Cho, Somi K., Yun, Ui Jeong, Jin, Mi Young, Lee, Seoung Hyun, Sachetto-Martins, Gilberto, Park, Ohkmae K. |
| Zdroj: |
Journal of Biological Chemistry; July 2001, Vol. 276 Issue: 28 p26688-26693, 6p |
| Abstrakt: |
The Arabidopsiswall-associated receptor kinase, Wak1, is a member of the Wak family (Wak1–5) that links the plasma membrane to the extracellular matrix. By the yeast two-hybrid screen, we found that a glycine-rich extracellular protein, AtGRP-3, binds to the extracellular domain of Wak1. Further in vitrobinding studies indicated that AtGRP-3 is the only isoform among the six tested AtGRPs that specifically interacts with Waks, and the cysteine-rich carboxyl terminus of AtGRP-3 is essential for its binding to Wak1. We also show that Wak1 and AtGRP-3 form a complex with a molecular size of ∼500 kDa in vivoin conjunction with the kinase-associated protein phosphatase, KAPP, that has been shown to interact with a number of plant receptor-like kinases. Binding of AtGRP-3 to Wak1 is shown to be crucial for the integrity of the complex. Wak1and AtGRP-3are both induced by salicylic acid treatment. Moreover, exogenously added AtGRP-3 up-regulates the expression of Wak1, AtGRP-3, and PR-1(for pathogenesis-related) in protoplasts. Taken together, our data suggest that AtGRP-3 regulates Wak1 function through binding to the cell wall domain of Wak1 and that the interaction of Wak1 with AtGRP-3 occurs in a pathogenesis-related process in planta. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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