Yang cycle enzyme DEP1: its moonlighting functions in PSI and ROS production during leaf senescence
文献类型： 外文期刊
第一作者： Wang, Chu-Kun
作者： Wang, Chu-Kun;Li, Xiu-Ming;Sun, Cui-Hui;Lu, Wen-Li;Hu, Da-Gang;Wang, Chu-Kun;Li, Xiu-Ming;Sun, Cui-Hui;Lu, Wen-Li;Hu, Da-Gang;Wang, Chu-Kun;Li, Xiu-Ming;Sun, Cui-Hui;Lu, Wen-Li;Hu, Da-Gang;Dong, Fang
作者机构：
关键词： DEHYDRATASE-ENOLASE-PHOSPHATASE-COMPLEX1; Yang cycle; Photosystem I; ROS; Leaf senescence; Photosynthesis
期刊名称：MOLECULAR HORTICULTURE （ 影响因子：8.1； 五年影响因子：11.0 ）
ISSN： 2730-9401
年卷期： 2022 年 2 卷 1 期
页码：
收录情况： SCI
摘要： Ethylene-mediated leaf senescence and the compromise of photosynthesis are closely associated but the underlying molecular mechanism is a mystery. Here we reported that apple DEHYDRATASE-ENOLASE-PHOSPHATASE-COMPLEX1 (MdDEP1), initially characterized to its enzymatic function in the recycling of the ethylene precursor SAM, plays a role in the regulation of photosystem I (PSI) activity, activating reactive oxygen species (ROS) homeostasis, and negatively regulating the leaf senescence. A series of Y2H, Pull-down, CO-IP and Cell-free degradation biochemical assays showed that MdDEP1 directly interacts with and dephosphorylates the nucleus-encoded thylakoid protein MdY3IP1, leading to the destabilization of MdY3IP1, reduction of the PSI activity, and the overproduction of ROS in plant cells. These findings elucidate a novel mechanism that the two pathways intersect at MdDEP1 due to its moonlighting role in destabilizing MdY3IP1, and synchronize ethylene-mediated leaf senescence and the compromise of photosynthesis.
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