The CDG1 kinase mediates brassinosteroid signal transduction from BRI1 receptor kinase to BSU1 phosphatase and GSK3-like kinase BIN2.

The CDG1 kinase mediates brassinosteroid signal transduction from BRI1 receptor kinase to BSU1 phosphatase and GSK3-like kinase BIN2.
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DOI:
10.1016/j.molcel.2011.05.037
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发表时间:
2011-08-19
期刊:
影响因子:
16
通讯作者:
Wang ZY
Wang ZY
中科院分区:
生物学1区
文献类型:
--
作者:
Kim TW;Guan S;Burlingame AL;Wang ZY

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油菜素类固醇(BR)信号通路包括两个受体样激酶(BRI 1、BAK 1)、一个质膜相关激酶(BSK 1)、两个磷酸酶(BSU 1和PP 2A)、一个GSK 3样激酶(BIN 2)和两个同源转录因子(BZR 1和BES 1/BZR 2)。但是信号传递的机制还不完全清楚。在这里,我们表明,受体样胞质激酶CDG 1介导的信号转导从BRI 1 BSU 1。转基因实验证实,CDG 1及其同源物CDL 1正调控BR信号和植物生长。质谱分析鉴定了CDG 1中的BRI 1磷酸化位点和BSU 1中的CDG 1磷酸化位点。这些磷酸化位点的突变损害了BR信号传导功能。结果表明,BRI 1磷酸化Ser 234以激活CDG 1激酶,CDG 1反过来磷酸化Ser 764以激活BSU 1,BSU 1通过脱磷酸化BIN 2的Tyr 200使BIN 2失活。因此,这项研究表明,一个完整的磷酸化/去磷酸化级联连接类固醇激活受体激酶的GSK 3样激酶在植物中。
The brassinosteroid (BR) signaling pathway includes two receptor-like kinases (BRI1, BAK1), a plasma membrane-associated kinase (BSK1), two phosphatases (BSU1 and PP2A), a GSK3-like kinase (BIN2), and two homologous transcription factors (BZR1 and BES1/BZR2). But the mechanisms of signal relay are not fully understood. Here we show that a receptor-like cytoplasmic kinase named CDG1 mediates signal transduction from BRI1 to BSU1. Transgenic experiments confirm that CDG1 and its homolog CDL1 positively regulate BR signaling and plant growth. Mass spectrometry analysis identified BRI1 phosphorylation sites in CDG1, and CDG1 phosphorylation sites in BSU1. Mutations of these phosphorylation sites compromised the BR signaling functions. The results demonstrate that BRI1 phosphorylates Ser234 to activate CDG1 kinase, and CDG1 in turn phosphorylates Ser764 to activate BSU1, which inactivates BIN2 by dephosphorylating Tyr200 of BIN2. This study thus demonstrates a complete phosphorylation/dephosphorylation cascade linking a steroid-activated receptor kinase to a GSK3-like kinase in plants.
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