XopZ and ORP1C cooperate to regulate the virulence of Xanthomonas oryzae pv. oryzae on Nipponbare.

XopZ and ORP1C cooperate to regulate the virulence of Xanthomonas oryzae pv. oryzae on Nipponbare.
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XopZ 和 ORP1C 合作调节米黄单胞菌 pv 的毒力。

DOI:
10.1080/15592324.2022.2035126
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发表时间:
2022-12-31
影响因子:
2.9
通讯作者:
Liu D
Liu D
中科院分区:
生物学4区
文献类型:
--
作者:
Ji H;Li T;Li X;Li J;Yu J;Zhang X;Liu D

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细菌性白叶枯病由黄单胞菌致病型引起。水稻白叶枯病(Xoo)一直被认为是世界性水稻病害之一。Xoo菌株通常使用高度保守的III型分泌系统(T3 SS)将毒力效应子传递到水稻细胞中,并进一步抑制宿主的免疫力。以前的研究报道,不同的黄单胞菌外蛋白(Xop)效应子,包括来自一个菌株的XopZ似乎共享功能冗余抑制水稻PAMP触发的免疫(PTI)。但在PXO 99菌株中,除其他xop基因外,单独缺失xopZ基因可显著降低Xoo的毒力。因此,XopZ效应子不仅抑制水稻PTI途径,而且在PXO 99-水稻互作中还具有其他未知的不可或缺的病理功能。在这里,我们还发现,与PXO 99株系相比,PXO 99突变株系在日本晴叶片上显示出较低的毒力。我们在水稻中鉴定了一种与氧甾醇结合相关的蛋白质ORP 1C,它是一种与XopZ相互作用的蛋白质。进一步的研究发现,水稻ORP 1C初步对PXO 99菌株的抗性起正向调节作用,XopZ与ORP 1C互作协同调节PXO 99-日本晴水稻的亲和互作。活性氧爆发和PTI标记基因表达数据表明,ORP 1C与水稻PTI途径没有直接关系。XopZ-ORP 1C相互作用的深层机制以及XopZ和ORP 1C如何协同调控PXO 99-水稻的相互作用有待进一步研究。
ABSTRACT Bacterial leaf blight caused by Xanthomonas oryzae pv. oryzae (Xoo) has always been considered to be one of the most severe worldwide diseases in rice. Xoo strains usually use the highly conserved type III secretion system (T3SS) to deliver virulence effectors into rice cells and further suppress the host’s immunity. Previous studies reported that different Xanthomonas outer protein (Xop) effectors include XopZ from one strain appear to share functional redundancies on suppressing rice PAMP-triggered immunity (PTI). But only xopZ, except other xop genes, could significantly impaire Xoo virulence when individually deleting in PXO99 strains. Thus, the XopZ effector should not only suppress rice PTI pathway, but also has other unknown indispensable pathological functions in PXO99–rice interactions. Here, we also found that ∆xopZ mutant strains displayed lower virulence on Nipponbare leaves compared with PXO99 strains. We identified an oxysterol-binding related protein, ORP1C, as a XopZ-interacting protein in rice. Further studies found that rice ORP1C preliminarily played a positive role in regulating the resistance to PXO99 strains, and XopZ–ORP1C interactions cooperated to regulate the compatible interactions of PXO99-Nipponbare rice. The reactive oxygen species (ROS) burst and PTI marker gene expression data indicated that ORP1C were not directly relevant to the PTI pathway in rice. The deeper mechanisms underlying XopZ–ORP1C interaction and how XopZ and ORP1C cooperate for regulating the PXO99–rice interactions require further exploration.
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