A receptor-channel trio conducts Ca(2+) signalling for pollen tube reception.

A receptor-channel trio conducts Ca(2+) signalling for pollen tube reception.
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DOI:
10.1038/s41586-022-04923-7
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发表时间:
2022-07
期刊:
影响因子:
64.8
通讯作者:
Luan, Sheng
Luan, Sheng
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Gao, Qifei;Wang, Chao;Xi, Yasheng;Shao, Qiaolin;Li, Legong;Luan, Sheng

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在开花植物中,花粉管和胚珠中助细胞之间的精确信号启动受精。当花粉管到达胚珠时,助细胞中的Ca ~(2+)浓度升高,导致花粉管破裂和精子释放。这一过程被称为花粉管接收,需要拟南芥中三个协同表达基因的作用,包括编码受体样激酶(RLK)的FERONIA(FER),糖基磷脂酰肌醇(GPI)锚定蛋白的LORELEI(LRE)和未知功能的跨膜蛋白的NORTIA(NTA)。虽然遗传分析将这三个参与者置于同一途径中,但仍然不知道它们如何共同作用以实现协同花粉管通信。我们确定了快速碱化因子(RALF)家族的两个花粉管衍生的小肽作为FER-LRE共受体的配体,FER-LRE共受体反过来将NTA招募到质膜。我们发现,NTA作为一个钙调素门控的钙通道所需的钙尖峰的助细胞。我们进一步重建了FER-LRE感知花粉管衍生肽激活NTA钙通道并启动钙尖峰(花粉管接收的第二信使)的生化途径。因此,FER-LRE-NTA三人组在雌性细胞中形成了一种以前未预料到的受体通道复合物,以识别雄性信号并触发受精过程。
Precise signaling between pollen tubes and synergid cells in the ovule initiates fertilization in flowering plants. The arrival of pollen tube to the ovule triggers Ca2+ spiking in the synergids that induce pollen tube rupture and sperm release. This process, named pollen tube reception, entails action of three synergid-expressed genes in Arabidopsis, including FERONIA (FER) encoding a receptor-like kinase (RLK), LORELEI (LRE) for a glycosylphosphatidylinositol (GPI)-anchored protein, and NORTIA (NTA) for a transmembrane protein of unknown function. While genetic analyses have placed these three players in the same pathway, it remains unknown how they work together to enable synergid-pollen tube communication. We identified two pollen-tube-derived small peptides of the rapid alkalinization factor (RALF) family as ligands for the FER-LRE co-receptor that in turn recruited NTA to the plasma membrane. We revealed that NTA functioned as a calmodulin-gated Ca2+ channel required for calcium spiking in the synergid. We further reconstituted the biochemical pathway in which FER-LRE perceived pollen tube-derived peptides to activate the NTA calcium channel and initiate calcium spiking, a second messenger for pollen tube reception. The FER-LRE-NTA trio thus formed a previously unanticipated receptor-channel complex in the female cell to recognize male signals and trigger fertilization process.
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