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Abstract
背景回顾:Lateral roots (LRs) increase root surface area and allow plants greater access to soil water and nutrients. LR formation is tightly regulated by the phytohormone auxin. Whereas the transcription factor ETHYLENE-RESPONSIVE ELEMENT BINDING FACTOR13 (ERF13) prevents LR emergence in Arabidopsis (Arabidopsis thaliana), auxin activates MITOGEN-ACTIVATED PROTEIN KINASE14 (MPK14), which leads to ERF13 degradation and ultimately promotes LR emergence.
主要发现:In this study, we discovered interactions between ERF13 and the E3 ubiquitin ligases MOS4-ASSOCIATED COMPLEX 3A (MAC3A) and MAC3B.
结果:As MAC3A and MAC3B gradually accumulate in the LR primordium, ERF13 levels gradually decrease. We demonstrate that MAC3A and MAC3B ubiquitinate ERF13, leading to its degradation and accelerating the transition of LR primordia from stage IV to stage V. Auxin enhances the MAC3A and MAC3B interaction with ERF13 by facilitating MPK14-mediated ERF13 phosphorylation.
结论:In summary, this study reveals the molecular mechanism by which auxin eliminates the inhibitory factor ERF13 through the MPK14–MAC3A and MAC3B signaling module, thus promoting LR emergence.
摘 要
侧根增加根的表面积,是的植物能够接触到更多的土壤水份和营养物质。侧根形成受到植物激素生长素的紧密控制。在拟南芥中,转录因子ERF13能够抑制侧根出现,而生长素能够激活MPK14,从而导致ERF13的降解,最终促进侧根的出现。本文中,作者发现ERF13和E3泛素连接酶MAC3A和MAC3B存在互作。在侧根原基中,随着MAC3A和MAC3B的逐渐积累,ERF13水平逐渐降低。作者发现MAC3A和MAC3B能够泛素化ERF13,从而导致ERF13蛋白的降解,加速侧根原基从IV期向V期的转变。生长素能够通过加速MPK14介导的ERF13磷酸化,增强MAC3A/B和ERF13的互作。综上,本文的研究揭示了一个生长素通过MPK14–MAC3A/B信号转导模块加速ERF13降解,从而促进侧根出现的分子机制。
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个人简介:
1998年,聊城大学,学士;
2003年,中国科学院植物研究所,博士;
2004-2011年,德国马普植物育种所、比利时根特大学,博后。
研究方向:主要是从植物激素尤其是生长素和细胞分裂素调控的角度,综合利用遗传学、细胞学和分子生物学、转录组学和蛋白组学等各种手段,研究植物根在铝,铬及营养缺陷等各种非生物逆境胁迫条件下根尖干细胞和根的可塑性生长发育的分子调控机制。
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