The Arabidopsis MIK2 receptor elicits immunity by sensing a conserved signature from phytocytokines and microbes.

The Arabidopsis MIK2 receptor elicits immunity by sensing a conserved signature from phytocytokines and microbes.
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DOI:
10.1038/s41467-021-25580-w
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发表时间:
2021-09-17
影响因子:
16.6
通讯作者:
He P
He P
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Hou S;Liu D;Huang S;Luo D;Liu Z;Xiang Q;Wang P;Mu R;Han Z;Chen S;Chai J;Shan L;He P

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无柄植物编码大量小肽和细胞表面驻留受体激酶,其中大多数具有未知功能。在这里,我们报告拟南芥受体激酶 MALE DISCOVERER 1-相互作用受体样激酶 2 (MIK2) 识别来自十字花科植物的富含丝氨酸的内源性肽 (SCOOP) 以及真菌镰刀菌属中存在的蛋白质的保守特征基序。和细菌丛毛单胞菌科,并引发各种免疫反应。 SCOOP 特征肽以亚纳摩尔敏感性的 MIK2 依赖性方式触发免疫反应并改变根部发育。 SCOOP12在体内和体外均直接与MIK2胞外富含亮氨酸的重复结构域结合,表明MIK2是SCOOP肽的受体。对 SCOOP 肽的感知诱导 MIK2 与辅助受体体细胞胚胎发生受体激酶 3 (SERK3) 和 SERK4 的关联,并通过胞质受体样激酶 BOTRYTIS 诱导激酶 1 (BIK1) 和 AVRPPHB SUSCEPTIBLE1 (PBS1)-LIKE 1 (PBL1) 传递信号。我们的研究确定了一种植物受体,它在通过汇聚信号传递来感知植物细胞因子和微生物蛋白的保守肽基序方面发挥双重作用,以确保强大的免疫反应。植物微生物相互作用过程中产生的肽信号可以触发植物的免疫反应。在这里,作者表明,SCOOP12(十字花科植物中存在的肽家族的成员)和镰刀菌中的 SCOOP12 样基序,可以在 MIK2 受体激酶感知后触发免疫反应。
Sessile plants encode a large number of small peptides and cell surface-resident receptor kinases, most of which have unknown functions. Here, we report that the Arabidopsis receptor kinase MALE DISCOVERER 1-INTERACTING RECEPTOR-LIKE KINASE 2 (MIK2) recognizes the conserved signature motif of SERINE-RICH ENDOGENOUS PEPTIDEs (SCOOPs) from Brassicaceae plants as well as proteins present in fungal Fusarium spp. and bacterial Comamonadaceae, and elicits various immune responses. SCOOP signature peptides trigger immune responses and altered root development in a MIK2-dependent manner with a sub-nanomolar sensitivity. SCOOP12 directly binds to the extracellular leucine-rich repeat domain of MIK2 in vivo and in vitro, indicating that MIK2 is the receptor of SCOOP peptides. Perception of SCOOP peptides induces the association of MIK2 and the coreceptors SOMATIC EMBRYOGENESIS RECEPTOR KINASE 3 (SERK3) and SERK4 and relays the signaling through the cytosolic receptor-like kinases BOTRYTIS-INDUCED KINASE 1 (BIK1) and AVRPPHB SUSCEPTIBLE1 (PBS1)-LIKE 1 (PBL1). Our study identifies a plant receptor that bears a dual role in sensing the conserved peptide motif from phytocytokines and microbial proteins via a convergent signaling relay to ensure a robust immune response. Peptide signals generated during plant microbe interactions can trigger immune responses in plants. Here the authors show that SCOOP12, a member of a family of peptides present in Brassicaceae plants, and SCOOP12-like motifs in Fusarium fungi, can trigger immune responses following perception by the MIK2 receptor kinase.
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