miR828a-CsMYB114 Module Negatively Regulates the Biosynthesis of Theobromine in Camellia sinensis

文献类型： 外文期刊

第一作者： Jin, Qifang

作者： Jin, Qifang;Wang, Zhong;Chen, Lan;Shao, Chenyu;Xie, Siyi;Shang, Fanghuizi;Wen, Shuai;Wu, Ting;Jin, Huiying;Liu, Guizhi;Hu, Jinyu;Su, Qin;Huang, Mengdi;Zhu, Qian;Zhou, Biao;Zhu, Lihua;Peng, Lvwen;Liu, Zhonghua;Huang, Jianan;Tian, Na;Liu, Shuoqian;Jin, Qifang;Wang, Zhong;Chen, Lan;Shao, Chenyu;Xie, Siyi;Shang, Fanghuizi;Wen, Shuai;Wu, Ting;Jin, Huiying;Liu, Guizhi;Hu, Jinyu;Su, Qin;Huang, Mengdi;Zhu, Qian;Zhou, Biao;Zhu, Lihua;Peng, Lvwen;Liu, Zhonghua;Huang, Jianan;Tian, Na;Liu, Shuoqian;Jin, Qifang;Wang, Zhong;Chen, Lan;Shao, Chenyu;Xie, Siyi;Shang, Fanghuizi;Wen, Shuai;Wu, Ting;Jin, Huiying;Liu, Guizhi;Hu, Jinyu;Su, Qin;Huang, Mengdi;Zhu, Qian;Zhou, Biao;Zhu, Lihua;Peng, Lvwen;Liu, Zhonghua;Huang, Jianan;Tian, Na;Liu, Shuoqian;Sandhu, Devinder;Huang, Feiyi

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关键词： "Jianghua Kucha"; theobromine; broadly targeted metabolomic analysis; gene suppression; tea plant

期刊名称：JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY （ 影响因子：6.1； 五年影响因子：6.3 ）

ISSN： 0021-8561

年卷期： 2024 年 72 卷 8 期

页码：

收录情况： SCI

摘要： Theobromine is an important quality component in tea plants (Camellia sinensis), which is produced from 7-methylxanthine by theobromine synthase (CsTbS), the key rate-limiting enzyme in theobromine biosynthetic pathway. Our transcriptomics and widely targeted metabolomics analyses suggested that CsMYB114 acted as a potential hub gene involved in the regulation of theobromine biosynthesis. The inhibition of CsMYB114 expression using antisense oligonucleotides (ASO) led to a 70.21% reduction of theobromine level in leaves of the tea plant, which verified the involvement of CsMYB114 in theobromine biosynthesis. Furthermore, we found that CsMYB114 was located in the nucleus of the cells and showed the characteristic of a transcription factor. The dual luciferase analysis, a yeast one-hybrid assay, and an electrophoretic mobility shift assay (EMSA) showed that CsMYB114 activated the transcription of CsTbS, through binding to CsTbS promoter. In addition, a microRNA, miR828a, was identified that directly cleaved the mRNA of CsMYB114. Therefore, we conclude that CsMYB114, as a transcription factor of CsTbS, promotes the production of theobromine, which is inhibited by miR828a through cleaving the mRNA of CsMYB114.

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