PHB3 interacts with BRI1 and BAK1 to mediate brassinosteroid signal transduction in Arabidopsis and tomato

文献类型： 外文期刊

第一作者： Li, Cheng

作者： Li, Cheng;Zhang, Shan;Li, Jingjuan;Wang, Fengde;Gao, Jianwei;Li, Cheng;Zhang, Shan;Huang, Shuhua;Zhao, Tong;Lv, Siqi;Liu, Jianwei;Wang, Shufen;Wang, Xiaofeng;Zhang, Shan;Huang, Shuhua;Zhang, Yanfeng;Liu, Xiaohui;He, Shen;Xiao, Fangming

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关键词： Arabidopsis; brassinosteroid; BRASSINOSTEROID-INSENSITIVE 1; BRI1 ASSOCIATED RECEPTOR KINASE 1; phosphorylation; PROHIBITIN 3; tomato

期刊名称：NEW PHYTOLOGIST （ 影响因子：9.4； 五年影响因子：10.5 ）

ISSN： 0028-646X

年卷期： 2024 年 241 卷 4 期

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收录情况： SCI

摘要： Brassinosteroids (BRs) are plant hormones that are essential in plant growth and development. BRASSINOSTEROID-INSENSITIVE 1 (BRI1) and BRI1 ASSOCIATED RECEPTOR KINASE 1 (BAK1), which are located on the plasma membrane, function as co-receptors that accept and transmit BR signals.PROHIBITIN 3 (PHB3) was identified in both BRI1 and BAK1 complexes by affinity purification and LC-MS/MS analysis. Biochemical data showed that BRI1/BAK1 interacted with PHB3 in vitro and in vivo.
BRI1/BAK1 phosphorylated PHB3 in vitro. When the Thr-80 amino acid in PHB3 was mutated to Ala, the mutant protein was not phosphorylated by BRI1 and the mutant protein interaction with BRI1 was abolished in the yeast two-hybrid assay. BAK1 did not phosphorylate the mutant protein PHB3(T54A). The loss-of-function phb3 mutant showed a weaker BR signal than the wild-type. Genetic analyses revealed that PHB3 is a BRI1/BAK1 downstream substrate that participates in BR signalling. PHB3 has five homozygous in tomato, and we named the closest to AtPHB3 as SlPHB3.1. Biochemical data showed that SlBRI1/SlSERK3A/SlSERK3B interacted with SlPHB3.1 and SlPHB3.3. The CRISPR-Cas9 method generated slphb3.1 mutant led to a BR signal stunted relatively in tomatoes.
PHB3 is a new component of the BR signal pathway in both Arabidopsis and tomato.PHB3 is a new component of the BR signal pathway in both Arabidopsis and tomato.

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