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

文献类型: 外文期刊

作者: Li, Cheng 1 ; Zhang, Shan 1 ; Li, Jingjuan 1 ; Huang, Shuhua 2 ; Zhao, Tong 2 ; Lv, Siqi 2 ; Liu, Jianwei 2 ; Wang, Shufen 2 ; Liu, Xiaohui 5 ; He, Shen 5 ; Zhang, Yanfeng 4 ; Xiao, Fangming 6 ; Wang, Fengde 1 ; Gao, Jianwei 1 ; Wang, Xiaofeng 2 ;

作者机构: 1.Shandong Acad Agr Sci, Inst Vegetables, Jinan 250100, Peoples R China

2.Northwest A&F Univ, Coll Hort, State Key Lab Crop Stress Biol Arid Areas, Yangling 712100, Shaanxi, Peoples R China

3.Shandong Inst Innovat & Dev, Jinan 250101, Peoples R China

4.Hybrid Rapeseed Res Ctr Shaanxi Prov, Yangling 712100, Shaanxi, Peoples R China

5.Xian Highness Agr Sci & Technol Co Ltd, Xian 710086, Shaanxi, Peoples R China

6.Univ Idaho, Dept Plant Sci, Moscow, ID 83844 USA

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

页码:

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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