A receptor-like cytoplasmic kinase phosphorylates the host target RIN4, leading to the activation of a plant innate immune receptor.

A receptor-like cytoplasmic kinase phosphorylates the host target RIN4, leading to the activation of a plant innate immune receptor.
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DOI:
10.1016/j.chom.2011.01.010
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发表时间:
2011-02-17
影响因子:
30.3
通讯作者:
Coaker G
Coaker G
中科院分区:
医学1区
文献类型:
--
作者:
Liu J;Elmore JM;Lin ZJ;Coaker G

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植物已经进化出复杂的监视系统来识别传递到宿主细胞中的病原体效应物。 RPM1 是一种 NB-LRR 免疫受体,可识别丁香假单胞菌效应子 AvrB 和 AvrRpm1。两种效应器均与免疫调节剂 RIN4 的磷酸化相关并影响其磷酸化。尽管激酶和所涉及的具体机制尚不清楚,但推测 RPM1 识别磷酸化的 RIN4。在这里,我们将 RIPK 确定为一种与 RIN4 相互作用的受体样蛋白激酶,可磷酸化 RIN4。为了响应细菌效应子,RIPK 在氨基酸残基 T21、S160 和 T166 处磷酸化 RIN4。 RIN4 磷酸模拟突变体表现出 RPM1 介导的防御反应的组成型激活,并且在丁香假单胞菌感染期间,AvrB 和 AvrRpm1 诱导 RIN4 磷酸化。 RIPK 敲除系表现出 RIN4 磷酸化降低和 RPM1 介导的防御反应减弱。综上所述,我们的结果表明 RIPK 激酶与效应器靶向蛋白复合物结合并对其进行修饰,以启动宿主免疫。
Plants have evolved sophisticated surveillance systems to recognize pathogen effectors delivered into host cells. RPM1 is an NB-LRR immune receptor that recognizes the Pseudomonas syringae effectors AvrB and AvrRpm1. Both effectors associate with and affect the phosphorylation of RIN4, an immune regulator. Although the kinase and the specific mechanisms involved are unclear, it has been hypothesized that RPM1 recognizes phosphorylated RIN4. Here we identify RIPK as a RIN4-interacting receptor-like protein kinase that phosphorylates RIN4. In response to bacterial effectors, RIPK phosphorylates RIN4 at amino acid residues T21, S160, and T166. RIN4 phosphomimetic mutants display constitutive activation of RPM1-mediated defense responses and RIN4 phosphorylation is induced by AvrB and AvrRpm1 during P. syringae infection. RIPK knockout lines exhibit reduced RIN4 phosphorylation and blunted RPM1-mediated defense responses. Taken together, our results demonstrate that the RIPK kinase associates with and modifies an effector-targeted protein complex to initiate host immunity.
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发表时间: 2003-02-07
期刊: CELL
影响因子: 64.5
作者:
Axtell, MJ;Staskawicz, BJ
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发表时间: 2003-09-01
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发表时间: 2005-02-08
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发表时间: 2009-06-05
期刊: PloS one
影响因子: 3.7
作者:
Kinch LN;Yarbrough ML;Orth K;Grishin NV
通讯作者: Grishin NV
DOI: 10.1046/j.1365-313x.2003.01653.x
发表时间: 2003-02-01
期刊: PLANT JOURNAL
影响因子: 7.2
作者:
de Torres, M;Sanchez, P;Grant, M
通讯作者: Grant, M