An Apple Protein Kinase MdSnRK1.1 Interacts with MdCAIP1 to Regulate ABA Sensitivity

文献类型： 外文期刊

第一作者： Liu, Xiao-Juan

作者： Liu, Xiao-Juan;Liu, Xin;Han, Peng-Liang;You, Chun-Xiang;Hao, Yu-Jin;An, Xiu-Hong

作者机构：

关键词： ABA sensitivity;Apple;C2-domain protein;Protein kinase;SnRK1.1

期刊名称：PLANT AND CELL PHYSIOLOGY （ 影响因子：4.927； 五年影响因子：5.516 ）

ISSN：

年卷期：

页码：

收录情况： SCI

摘要： ABA is a crucial phytohormone for development and stress responses in plants. Snf1-related protein kinase 1.1 (SnRK1.1) is involved in the ABA response. However, the molecular mechanism underlying the SnRK1.1 response to ABA is largely unknown. Here, it was found that overexpression of the apple MdSnRK1.1 gene enhanced ABA sensitivity in both transgenic apple calli and Arabidopsis seedlings. Subsequently, a yeast two-hybrid screen demonstrated that MdCAIP1 (C2-domain ABA Insensitive Protein1) interacted with MdSnRK1.1. Their interaction was further confirmed by pull-down and co-immuno-precipitation assays. Expression of the MdCAIP1 gene was positively induced by ABA. Its overexpression enhanced ABA sensitivity in transgenic apple calli. Furthermore, it was found that MdSnRK1.1 phosphorylated the MdCAIP1 protein in vivo and promoted its degradation in vitro and in vivo. As a result, MdSnRK1.1 inhibitedMdCAIP1-mediated ABA sensitivity, and MdCAIP1 partially reduced MdSnRK1.1-mediated ABA sensitivity. Our findings indicate that MdSnRK1.1 plays an important role in the ABA response, partially by controlling the stability of the MdCAIP1 protein.

分类号： Q945`Q942

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