Lysine 2-hydroxyisobutyrylation proteomics analyses reveal the regulatory mechanism of CaMYB61-CaAFR1 module in regulating stem development in Capsicum annuum L.
文献类型： 外文期刊
作者： Li, Qing;Fu, Canfang;Hu, Bowen;Yang, Bozhi;Yu, Huiyang;He, Huan;Xu, Qing;Chen, Xuejun;Dai, Xiongze;Fang, Rong;Xiong, Xingyao;Zhou, Kunhua;Yang, Sha;Zou, Xuexiao;Liu, Zhoubin;Ou, Lijun
作者机构：
关键词： K-hib;histone deacetylases;stem lodging;cellulose and hemicellulose;CaMYB61;CaAFR1
期刊名称： PLANT JOURNAL
ISSN： 0960-7412
年卷期： 2024 年
页码：
收录情况： SCIE（2024版） ; ; EI（2024版）
摘要： Plant stems constitute the most abundant renewable resource on earth. The function of lysine (K)-2-hydroxyisobutyrylation (K-hib), a novel post-translational modification (PTM), has not yet been elucidated in plant stem development. Here, by assessing typical pepper genotypes with straight stem (SS) and prostrate stem (PS), we report the first large-scale proteomics analysis for protein K-hib to date. K-hib-modifications influenced central metabolic processes involved in stem development, such as glycolysis/gluconeogenesis and protein translation. The high K-hib level regulated gene expression and protein accumulation associated with cell wall formation in the pepper stem. Specially, we found that CaMYB61 knockdown lines that exhibited prostrate stem phenotypes had high K-hib levels. Most histone deacetylases (HDACs, e.g., switch-independent 3 associated polypeptide function related 1, AFR1) potentially function as the erasing enzymes involved in reversing K-hib level. CaMYB61 positively regulated CaAFR1 expression to erase K-hib and promote cellulose and hemicellulose accumulation in the stem. Therefore, we propose a bidirectional regulation hypothesis of K-hib modifications and K-hib erasing in stem development, and reveal a novel epigenetic regulatory network in which the CaMYB61-CaAFR1 molecular module participating in the regulation of K-hib levels and biosynthesis of cellulose and hemicellulose for the first time.
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