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Tomato MED25 regulates fruit ripening by interacting with EIN3-like transcription factors

文献类型： 外文期刊

作者： Deng, Lei 1 ; Yang, Tianxia 1 ; Li, Qian 3 ; Chang, Zeqian 1 ; Sun, Chuanlong 1 ; Jiang, Hongling 1 ; Meng, Xianwen 4 ; Huang, Tingting 5 ; Li, Chang-Bao 6 ; Zhong, Silin 7 ; Li, Chuanyou 1 ;

作者机构： 1.Chinese Acad Sci, Inst Genet & Dev Biol, Innovat Acad Seed Design, Natl Ctr Plant Gene Res Beijing,State Key Lab Plan, Beijing 100101, Peoples R China

2.Univ Chinese Acad Sci, CAS Ctr Excellence Biot Interact, Beijing 100049, Peoples R China

3.China Agr Univ, Coll Hort, Dept Pomol, Beijing 100193, Peoples R China

4.Shandong Agr Univ, Coll Hort Sci & Engn, State Key Lab Crop Biol, Tai An 271018, Peoples R China

5.Qingdao Acad Agr Sci, Inst Vegetable, Qingdao 266100, Peoples R China

6.Beijing Acad Agr & Forestry Sci, Beijing Vegetable Res Ctr, Key Lab Biol & Genet Improvement Hort Crops North, Minist Agr, Beijing 100097, Peoples R China

7.Chinese Univ Hong Kong, Sch Life Sci, State Key Lab Agrobiotechnol, Hong Kong 999077, Peoples R China

期刊名称：PLANT CELL （ 影响因子：11.6； 五年影响因子：12.9 ）

ISSN： 1040-4651

年卷期： 2023 年 35 卷 3 期

页码：

收录情况： SCI

摘要： Fruit ripening relies on the precise spatiotemporal control of RNA polymerase II (Pol II)-dependent gene transcription, and the evolutionarily conserved Mediator (MED) coactivator complex plays an essential role in this process. In tomato (Solanum lycopersicum), a model climacteric fruit, ripening is tightly coordinated by ethylene and several key transcription factors. However, the mechanism underlying the transmission of context-specific regulatory signals from these ripening-related transcription factors to the Pol II transcription machinery remains unknown. Here, we report the mechanistic function of MED25, a subunit of the plant Mediator transcriptional coactivator complex, in controlling the ethylene-mediated transcriptional program during fruit ripening. Multiple lines of evidence indicate that MED25 physically interacts with the master transcription factors of the ETHYLENE-INSENSITIVE 3 (EIN3)/EIN3-LIKE (EIL) family, thereby playing an essential role in pre-initiation complex formation during ethylene-induced gene transcription. We also show that MED25 forms a transcriptional module with EIL1 to regulate the expression of ripening-related regulatory as well as structural genes through promoter binding. Furthermore, the EIL1-MED25 module orchestrates both positive and negative feedback transcriptional circuits, along with its downstream regulators, to fine-tune ethylene homeostasis during fruit ripening.

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