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Overexpression of AtPTPA in Arabidopsis increases protein phosphatase 2A activity by promoting holoenzyme formation and ABA negatively affects holoenzyme formation

文献类型： 外文期刊

作者： Chen, Jian 1 ; Zhu, Xunlu 1 ; Shen, Guoxin 2 ; Zhang, Hong 1 ;

作者机构： 1.Texas Tech Univ, Dept Biol Sci, Lubbock, TX 79409 USA

2.Zhejiang Acad Agr Sci, Hangzhou, Zhejiang, Peoples R China

关键词： Arabidopsis;protein phosphatase 2A;PP2A holoenzyme assembly;PP2Ac methylation

期刊名称：PLANT SIGNALING & BEHAVIOR （ 影响因子：2.247； 五年影响因子：2.369 ）

ISSN： 1559-2316

年卷期： 2015 年 10 卷 11 期

页码：

收录情况： SCI

摘要： AtPTPA is a critical regulator for the holoenzyme assembling of protein phosphatase 2A (PP2A) in Arabidopsis. Characterization of AtPTPA improves our understanding of the function and regulation of PP2A in eukaryotes. Further analysis of AtPTPA-overexpressing plants indicates that AtPTPA increases PP2A activity by promoting PP2A's AC dimer formation, thereby holoenzyme assembling. Plant hormone abscisic acid (ABA) reduces PP2A enzyme activity by negatively affects PP2A's AC dimer formation. Therefore, AtPTPA is a positive factor that promotes PP2A holoenzyme assembly, and ABA is a negative factor that prevents PP2A holoenzyme assembly.

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