Arabidopsis membrane protein AMAR1 interaction with type III effector XopAM triggers a hypersensitive response

文献类型： 外文期刊

第一作者： Xie, Qingbiao

作者： Xie, Qingbiao;Wei, Bingzheng;Zhan, Zhaohong;Wu, Kejian;Chen, Yu;He, Chaozu;Niu, Xiaolei;Li, Chunxia;Tang, Chaorong;Tao, Jun;He, Qiguang;Liu, Shiyao;He, Chaozu;Niu, Xiaolei;He, Chaozu;Li, Chunxia;Tao, Jun

作者机构：

期刊名称：PLANT PHYSIOLOGY （ 影响因子：7.4； 五年影响因子：8.7 ）

ISSN： 0032-0889

年卷期： 2023 年

页码：

收录情况： SCI

摘要： The efficient infection of plants by the bacteria Xanthomonas campestris pv. campestris (Xcc) depends on its type III effectors (T3Es). Although the functions of AvrE family T3Es have been reported in some bacteria, the member XopAM in Xcc has not been studied. As XopAM has low sequence similarity to reported AvrE-T3Es and different reports have shown that these T3Es have different targets in hosts, we investigated the functions of XopAM in the Xcc-plant interaction. Deletion of xopAM from Xcc reduced its virulence in cruciferous crops but increased virulence in Arabidopsis (Arabidopsis thaliana) Col-0, indicating that XopAM may perform opposite functions depending on the host species. We further found that XopAM is a lipase that may target the cytomembrane and that this activity might be enhanced by its membrane-targeted protein XOPAM-ACTIVATED RESISTANCE 1 (AMAR1) in Arabidopsis Col-0. The binding of XopAM to AMAR1 induced an intense hypersensitive response that restricted Xcc proliferation. Our results showed that the roles of XopAM in Xcc infection are not the same as those of other AvrE-T3Es, indicating that the functions of this type of T3E have differentiated during long-term bacterium-host interactions. XOPAM-ACTIVATED RESISTANCE 1 regulates cell necrosis and is required for Arabidopsis-Xanthomonas campestris interaction mediated by the type III effector XopAM.

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