Processing and subcellular trafficking of ER-tethered EIN2 control response to ethylene gas.

Processing and subcellular trafficking of ER-tethered EIN2 control response to ethylene gas.
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DOI:
10.1126/science.1225974
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发表时间:
2012-10-19
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Ecker JR
Ecker JR
中科院分区:
其他
文献类型:
--
作者:
Qiao H;Shen Z;Huang SS;Schmitz RJ;Urich MA;Briggs SP;Ecker JR

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乙烯气体在植物的许多发育过程和胁迫反应中是必不可少的。乙烯不敏感2(EIN 2)是一种NRAMP样膜整合蛋白,在乙烯信号转导中起重要作用,但其功能仍是个谜。在这里,我们报告说,磷酸化调节的蛋白水解处理EIN 2触发其内质网(ER)到核转位。ER-栓系的EIN 2显示组成性三重应答1(CTR 1)激酶依赖性磷酸化。乙烯在几个位点引发去磷酸化,并在其中一个位点引发蛋白水解裂解,导致羧基末端EIN 2片段(EIN 2-C′)的核转位。模拟EIN 2去磷酸化或EINCTR 1的突变显示EIN 2-C′和EIN 3的组成性切割和核定位以及EIN 3-LIKE 1依赖性乙烯反应活化。这些发现揭示了亚细胞通讯的机制,乙烯刺激EIN 2-C′肽的磷酸化依赖性切割和核运动,将ER中的激素感知和信号传导成分与核定位的转录调节因子联系起来。
Ethylene gas is essential for many developmental processes and stress responses in plants. ETHYLENE INSENSITIVE2 (EIN2), an NRAMP-like integral membrane protein, plays an essential role in ethylene signaling, but its function remains enigmatic. Here we report that phosphorylation-regulated proteolytic processing of EIN2 triggers its endoplasmic reticulum (ER)–to–nucleus translocation. ER-tethered EIN2 shows CONSTITUTIVE TRIPLE RESPONSE1 (CTR1) kinase–dependent phosphorylation. Ethylene triggers dephosphorylation at several sites and proteolytic cleavage at one of these sites, resulting in nuclear translocation of a carboxyl-terminal EIN2 fragment (EIN2-C′). Mutations that mimic EIN2 dephosphorylation, or inactivate CTR1, show constitutive cleavage and nuclear localization of EIN2-C′ and EIN3 and EIN3-LIKE1–dependent activation of ethylene responses. These findings uncover a mechanism of subcellular communication whereby ethylene stimulates phosphorylation-dependent cleavage and nuclear movement of the EIN2-C′ peptide, linking hormone perception and signaling components in the ER with nuclear-localized transcriptional regulators.
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