文献类型： 外文期刊

作者： Li, Qing ¹ ; Fu, Canfang ¹ ; Hu, Bowen ¹ ; Yang, Bozhi ¹ ; Yu, Huiyang ¹ ; He, Huan ¹ ; Xu, Qing ¹ ; Chen, Xuejun ³ ; Dai, Xiongze ¹ ; Fang, Rong ³ ; Xiong, Xingyao ⁴ ; Zhou, Kunhua ³ ; Yang, Sha ¹ ; Zou, Xuexiao ¹ ; Liu, Zhoubin ¹ ; Ou, Lijun ¹ ;

作者机构： 1.Hunan Agr Univ, Engn Res Ctr Educ, Key Lab Vegetable Biol Hunan Prov, Coll Hort,Minist Germplasm Innovat & Breeding New, Changsha 410125, Peoples R China

2.Yuelushan Lab, Changsha 410128, Peoples R China

3.Jiangxi Acad Agr Sci, Vegetable & Flower Inst, Nanchang 330200, Peoples R China

4.Chinese Acad Agr Sci, Agr Genom Inst Shenzhen, Minist Agr & Rural Affairs, Shenzhen Branch,Guangdong Lab Lingnan Modern Agr,K, Shenzhen 518000, Peoples R China

关键词： K-hib; histone deacetylases; stem lodging; cellulose and hemicellulose; CaMYB61; CaAFR1

期刊名称：PLANT JOURNAL （ 影响因子：7.2； 五年影响因子：7.9 ）

ISSN： 0960-7412

年卷期： 2024 年

页码：

收录情况： SCI

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.