A bacterial kinase phosphorylates OSK1 to suppress stomatal immunity in rice.

A bacterial kinase phosphorylates OSK1 to suppress stomatal immunity in rice.
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细菌激酶磷酸化 OSK1 以抑制水稻气孔免疫

DOI:
10.1038/s41467-021-25748-4
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发表时间:
2021-09-16
影响因子:
16.6
通讯作者:
Sun W
Sun W
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Wang S;Li S;Wang J;Li Q;Xin XF;Zhou S;Wang Y;Li D;Xu J;Luo ZQ;He SY;Sun W

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细菌效应子的黄单胞菌外部蛋白 C2 (XopC2) 家族广泛存在于植物病原体和军团菌中。然而,这些效应器的生化活性和宿主靶点仍然是个谜。在这里,我们发现 XopC2 的异位表达促进转基因水稻植物中的茉莉酸信号传导和气孔开放,这些植物更容易受到米黄单胞菌 pv 的影响。米兹科拉感染。在这些表型的指导下,我们发现 XopC2 代表一个非典型激酶家族,该家族特异性磷酸化 OSK1,OSK1 是 Skp1-Cullin-F-box 泛素连接酶复合物的通用接头蛋白。有趣的是,XopC2 对 OSK1 Ser53 的磷酸化专门增加了 OSK1 与茉莉酸受体 OsCOI1b 的结合亲和力,并通过抑制气孔免疫特异性增强 JAZ 转录抑制因子的泛素化和降解以及植物病害易感性。这些结果将 XopC2 定义为致病效应激酶家族的原型成员,并强调了激活茉莉酸信号传导的智能分子机制。 XopC2 效应子存在于许多植物细菌病原体中。在这里,作者表明,XopC2 具有激酶活性,并通过磷酸化 OSK1 蛋白来增强疾病易感性,从而增加其与茉莉酸受体 COI1b 的相互作用,从而促进 JA 信号传导和气孔开放。
The Xanthomonas outer protein C2 (XopC2) family of bacterial effectors is widely found in plant pathogens and Legionella species. However, the biochemical activity and host targets of these effectors remain enigmatic. Here we show that ectopic expression of XopC2 promotes jasmonate signaling and stomatal opening in transgenic rice plants, which are more susceptible to Xanthomonas oryzae pv. oryzicola infection. Guided by these phenotypes, we discover that XopC2 represents a family of atypical kinases that specifically phosphorylate OSK1, a universal adaptor protein of the Skp1-Cullin-F-box ubiquitin ligase complexes. Intriguingly, OSK1 phosphorylation at Ser53 by XopC2 exclusively increases the binding affinity of OSK1 to the jasmonate receptor OsCOI1b, and specifically enhances the ubiquitination and degradation of JAZ transcription repressors and plant disease susceptibility through inhibiting stomatal immunity. These results define XopC2 as a prototypic member of a family of pathogenic effector kinases and highlight a smart molecular mechanism to activate jasmonate signaling. XopC2 effectors are present in many plant bacterial pathogens. Here the authors show that XopC2 has kinase activity and enhances disease susceptibility by phosphorylating the OSK1 protein, which increases its interaction with the jasmonate receptor COI1b to promote JA signaling and stomatal opening.
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