SnRK2 protein kinases represent an ancient system in plants for adaptation to a terrestrial environment
SnRK2 protein kinases represent an ancient system in plants for adaptation to a terrestrial environment
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DOI：
10.1038/s42003-019-0281-1
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发表时间：
2019-01
影响因子：
5.9
通讯作者：
Akihisa Shinozawa;Ryoko Otake;D. Takezawa;T. Umezawa;K. Komatsu;Keisuke Tanaka;Anna Amagai;S. Ishikawa;Y. Hara;Y. Kamisugi;A. Cuming;K. Hori;H. Ohta;Fuminori Takahashi;K. Shinozaki;Takahisa Hayashi;T. Taji;Y. Sakata
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文献类型：
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作者：
Akihisa Shinozawa;Ryoko Otake;D. Takezawa;T. Umezawa;K. Komatsu;Keisuke Tanaka;Anna Amagai;S. Ishikawa;Y. Hara;Y. Kamisugi;A. Cuming;K. Hori;H. Ohta;Fuminori Takahashi;K. Shinozaki;Takahisa Hayashi;T. Taji;Y. Sakata
SNF1相关蛋白激酶2(SnRK2)家族包括被子植物渗透胁迫和脱落酸(ABA)反应的关键调节因子，可分为三个亚类。亚类III SnRK2参与ABA反应，而亚类I SnRK2通过渗透胁迫调节ABA无反应。在这里，我们报道了一个古老的基于SnRK2亚类的信号模块，包括ABA和上游类Raf蛋白(ARK)，专门保护苔藓免受干旱。来自拟南芥和半陆生藻类Klebsormidium nitens的亚类IIISnRK2，它包含除脱落酸受体外的所有脱落酸信号成分，补充了Physcomitrella SnRK2−突变体，而拟南芥亚类ISnRK2不能。我们认为，最早的陆地植物通过招募ABA来调节先前存在的脱水反应而发展了ABA/Ark/亚类III SnRK2信号模块，随后在维管植物中进化出一个新的亚类I SnRK2系统，赋予渗透胁迫保护独立于古老的系统。
The SNF1-related protein kinase 2 (SnRK2) family includes key regulators of osmostress and abscisic acid (ABA) responses in angiosperms and can be classified into three subclasses. Subclass III SnRK2s act in the ABA response while ABA-nonresponsive subclass I SnRK2s are regulated through osmostress. Here we report that an ancient subclass III SnRK2-based signalling module including ABA and an upstream Raf-like kinase (ARK) exclusively protects the mossPhyscomitrella patensfrom drought. Subclass III SnRK2s from both Arabidopsis and from the semiterrestrial algaKlebsormidium nitens, which contains all the components of ABA signalling except ABA receptors, complementPhyscomitrella snrk2−mutants, whereas Arabidopsis subclass I SnRK2 cannot. We propose that the earliest land plants developed the ABA/ARK/subclass III SnRK2 signalling module by recruiting ABA to regulate a pre-existing dehydration response and that subsequently a novel subclass I SnRK2 system evolved in vascular plants conferring osmostress protection independently from the ancient system.