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Ubiquitin-specific protease 24 negatively regulates abscisic acid signalling in Arabidopsis thaliana

文献类型： 外文期刊

作者： Zhao, Jinfeng 1 ; Zhou, Huapeng 2 ; Zhang, Ming 4 ; Gao, Yanan 1 ; Li, Long 6 ; Gao, Ying 1 ; Li, Ming 4 ; Yang, Yuhong 7 ;

作者机构： 1.Chinese Acad Agr Sci, Inst Crop Sci, Natl Key Facil Crop Gene Resources & Genet Improv, Beijing 100081, Peoples R China

2.China Agr Univ, Coll Biol Sci, State Key Lab Plant Physiol & Biochem, Beijing 100193, Peoples R China

3.Sichuan Univ, Coll Life Sci, Chengdu 610064, Peoples R China

4.Northeast Agr Univ, Coll Agr, Harbin 150030, Peoples R China

5.Heilongjiang Acad Agr Sci, Ind Crop Inst, Harbin 150086, Peoples R China

6.Shenyang Agr Univ, Coll Life Sci, Shenyang 110161, Peoples R China

7.Shenya

关键词： ABA overly sensitive;deubiquitinating enzyme;drought sensitivity;salt stress;stomata;protein phosphatase 2C

期刊名称：PLANT CELL AND ENVIRONMENT （ 影响因子：7.228； 五年影响因子：7.791 ）

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收录情况： SCI

摘要： Abscisic acid (ABA) is an important plant hormone integrating environmental stress and plant growth. Protein ubiquitination and deubiquitination are reversible processes catalysed by E3 ubiquitin ligase and deubiquitinating enzyme, respectively. Lots of E3 ubiquitin ligase and transcriptional factors modified by ubiquitination were reported to modulate ABA signalling. However, no deubiquitinating enzyme has been identified that functions in ABA signalling until now. Here, we isolated an ABA overly sensitive mutant, ubp24, in which the gene encoding ubiquitin-specific protease 24 (UBP24, At4g30890) was disrupted by a T-DNA insertion. The ubp24 mutant was hypersensitive to ABA and salt stress in both postgerminative growth and seedling growth. However, stomata closure in the ubp24 mutant was less sensitive to ABA, and the ubp24 mutant showed drought sensitivity. UBP24 possessed deubiquitinating enzyme activity, and the activity was essential for UBP24 function. Additionally, UBP24 formed homodimer in vivo. UBP24 was genetically upstream of ABI2, and the phosphatase activity of protein phosphatase 2C was decreased in the ubp24 mutant compared with the wild type in the presence of ABA. These results uncover an important regulatory role for the ubiquitin-specific protease in response to ABA and salt stress in plant.

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