SINAT E3 Ligases Control the Light-Mediated Stability of the Brassinosteroid-Activated Transcription Factor BES1 in Arabidopsis.

SINAT E3 Ligases Control the Light-Mediated Stability of the Brassinosteroid-Activated Transcription Factor BES1 in Arabidopsis.
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SINAT E3 连接控制拟南芥中油菜素类固醇激活转录因子 BES1 的光介导稳定性。

DOI:
10.1016/j.devcel.2017.03.014
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发表时间:
2017-04-10
期刊:
影响因子:
11.8
通讯作者:
Wang X
Wang X
中科院分区:
生物学1区
文献类型:
--
作者:
Yang M;Li C;Cai Z;Hu Y;Nolan T;Yu F;Yin Y;Xie Q;Tang G;Wang X

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油菜素甾醇类植物激素(BR)参与光介导的植物生长调节,但其潜在的机制还远未完全了解。此外,BR信号通路中的核心转录因子BRI 1-EMS-SUPPLYOR 1(BES 1)的功能在很大程度上取决于其磷酸化状态和蛋白质稳定性,但对BES 1的调控尚不清楚。在这里,我们报告,拟南芥(SINATs)的SINA特异性地与去磷酸化的BES 1相互作用,并介导其泛素化和降解。我们的遗传数据表明,SINAT以BES 1依赖的方式抑制BR信号传导。有趣的是,我们发现SINAT的蛋白水平在黑暗中降低,在光照下增加,这相应地改变了BES 1蛋白水平。因此,我们的研究不仅揭示了BES 1降解的新机制,而且还为了解光如何通过控制不同形式的BES 1的积累来有条件地调节植物生长提供了重要见解。BES 1的功能在很大程度上取决于其磷酸化状态和蛋白质稳定性。Yang等人表明SINAT E3连接酶特异性介导去磷酸化的BES 1的降解,并且光可以稳定SINAT蛋白以调节BES 1水平。因此,SINATs-BES 1模块将光和BR信号传导联系起来以调节植物发育。
The plant hormones brassinosteroids (BRs) participate in light-mediated regulation of plant growth, although the underlying mechanisms are far from being fully understood. In addition, the function of the core transcription factor in the BR signaling pathway, BRI1-EMS-SUPPRESSOR 1 (BES1), largely depends on its phosphorylation status and its protein stability, but the regulation of BES1 is not well understood. Here, we report that SINA of Arabidopsis thaliana (SINATs) specifically interact with dephosphorylated BES1 and mediate its ubiquitination and degradation. Our genetic data demonstrated that SINATs inhibit BR signaling in a BES1-dependent manner. Interestingly, we found that the protein levels of SINATs were decreased in the dark and increased in the light, which changed BES1 protein levels accordingly. Thus, our study not only uncovered a new mechanism of BES1 degradation but also provides significant insights into how light conditionally regulates plant growth through controlling accumulation of different forms of BES1. The function of BES1 largely depends on its phosphorylation status and protein stability. Yang et al. show that SINAT E3 ligases specifically mediate degradation of dephosphorylated BES1, and light can stabilize SINAT proteins to regulate BES1 level. Therefore, the SINATs-BES1 module links light and BR signaling to regulate plant development.
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