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Ethylene-triggered subcellular trafficking of CTR1 enhances the response to ethylene gas
bioRxiv - Plant Biology Pub Date : 2021-09-17 , DOI: 10.1101/2020.06.12.148858
Han Yong Lee , Dong Hye Seo , Arkadipta Bakshi , Hye Lin Park , Chanung Park , Joseph J. Kieber , Brad M. Binder , Gyeong Mee Yoon

Ethylene gas controls plant growth and stress responses. Ethylene-exposed dark-grown seedlings exhibit dramatic growth reduction, yet the seedlings rapidly return to the basal growth rate when ethylene gas is removed. However, the underlying mechanism governing this reversible acclimation of dark-grown seedlings to ethylene remains enigmatic. Here, we report that ethylene triggers the translocation of the Raf-like protein kinase CONSTITUTIVE TRIPLE RESPONSE1 (CTR1), a negative regulator of ethylene signaling, from the endoplasmic reticulum to the nucleus. Nuclear-localized CTR1 stabilizes the ETHYLENE-INSENSITIVE3 (EIN3) transcription factor via interaction with the EIN3-BINDING F-box (EBF) proteins, thus enhancing the ethylene response and delaying growth recovery. These findings uncover a mechanism of the ethylene signaling pathway that links the spatiotemporal dynamics of cellular signaling components to organismal responses.

中文翻译:

乙烯触发的 CTR1 亚细胞运输增强了对乙烯气体的反应

乙烯气体控制植物生长和胁迫反应。暴露于乙烯的黑暗生长的幼苗表现出显着的生长减慢,但当去除乙烯气体时,幼苗会迅速恢复到基础生长速度。然而,控制黑暗生长的幼苗对乙烯的这种可逆驯化的潜在机制仍然是个谜。在这里,我们报告乙烯触发了 Raf 样蛋白激酶组成性三重响应 (CTR1),乙烯信号的负调节因子,从内质网到细胞核的易位。核定位的 CTR1 通过与 EIN3-BINDING F-box (EBF) 蛋白相互作用稳定 ETHYLENE-INSENSITIVE3 (EIN3) 转录因子,从而增强乙烯反应并延迟生长恢复。
更新日期:2021-09-20
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