Ethylene Regulates Levels of Ethylene Receptor/CTR1 Signaling Complexes in Arabidopsis thaliana

文献类型： 外文期刊

第一作者： Shakeel, Samina N.

作者： Shakeel, Samina N.;Gao, Zhiyong;Amir, Madiha;Chen, Yi-Feng;Rai, Muneeza Iqbal;Ul Haq, Noor;Schaller, G. Eric;Shakeel, Samina N.;Amir, Madiha;Rai, Muneeza Iqbal;Ul Haq, Noor;Chen, Yi-Feng

作者机构：

关键词： Arabidopsis;histidine kinase;hormone receptor;membrane protein;protein complex;protein turnover;serine;threonine protein kinase;ethylene

期刊名称：JOURNAL OF BIOLOGICAL CHEMISTRY （ 影响因子：5.157； 五年影响因子：5.041 ）

ISSN： 0021-9258

年卷期： 2015 年 290 卷 19 期

页码：

收录情况： SCI

摘要： Background: Plant responses to the hormone ethylene depend on ethylene receptors and the kinase CTR1. Results: The receptors and CTR1 exist as signaling complexes whose levels change in response to ethylene. Conclusion: A model incorporating transcriptional induction and ethylene-dependent turnover of receptor/CTR1 complexes is proposed. Significance: Results presented here reconcile molecular responses at the receptor level with physiological changes in sensitivity to ethylene. The plant hormone ethylene is perceived by a five-member family of receptors in Arabidopsis thaliana. The receptors function in conjunction with the Raf-like kinase CTR1 to negatively regulate ethylene signal transduction. CTR1 interacts with multiple members of the receptor family based on co-purification analysis, interacting more strongly with receptors containing a receiver domain. Levels of membrane-associated CTR1 vary in response to ethylene, doing so in a post-transcriptional manner that correlates with ethylene-mediated changes in levels of the ethylene receptors ERS1, ERS2, EIN4, and ETR2. Interactions between CTR1 and the receptor ETR1 protect ETR1 from ethylene-induced turnover. Kinetic and dose-response analyses support a model in which two opposing factors control levels of the ethylene receptor/CTR1 complexes. Ethylene stimulates the production of new complexes largely through transcriptional induction of the receptors. However, ethylene also induces turnover of receptors, such that levels of ethylene receptor/CTR1 complexes decrease at higher ethylene concentrations. Implications of this model for ethylene signaling are discussed.

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