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The triglyceride catabolism regulated by a serine/threonine protein phosphatase, Smek1, is required for development and plant infection in Magnaporthe oryzae

文献类型： 外文期刊

作者： Huang, Zhicheng 1 ; Cao, Huijuan 2 ; Wang, Huan 1 ; Huang, Pengyun 3 ; Wang, Jing 4 ; Cai, Ying-Ying 5 ; Wang, Qing 1 ; Li, Yan 1 ; Wang, Jiaoyu 4 ; Liu, Xiao-Hong 5 ; Lin, Fu-Cheng 4 ; Lu, Jianping 1 ;

作者机构： 1.Zhejiang Univ, Coll Life Sci, State Key Lab Managing Biot & Chem Threats Qual &, Hangzhou 310058, Peoples R China

2.Jiangsu Acad Agr Sci, Inst Plant Protect, Nanjing, Peoples R China

3.Linyi Univ, Sch Med, Linyi, Peoples R China

4.Inst Plant Protect & Microbiol, Zhejiang Acad Agr Sci, State Key Lab Managing Biot & Chem Threats Qual &, Hangzhou, Peoples R China

5.Zhejiang Univ, Inst Biotechnol, Hangzhou, Peoples R China

关键词： carbon catabolite repression; fat catabolism; glyoxylate cycle; lipid degradation; pathogenicity; phosphatase; beta-oxidation

期刊名称：MOLECULAR PLANT PATHOLOGY （ 影响因子：4.9； 五年影响因子：5.9 ）

ISSN： 1464-6722

年卷期： 2023 年

页码：

收录情况： SCI

摘要： Magnaporthe oryzae is a pathogenic fungus that seriously harms rice production. Phosphatases and carbon metabolism play crucial roles in the growth and development of eukaryotes. However, it remains unclear how serine/threonine phosphatases regulate the catabolism of triglycerides, a major form of stored lipids. In this study, we identified a serine/threonine protein phosphatase regulatory subunit, Smek1, which is required for the growth, conidiation, and virulence of M. oryzae. Deletion of SMEK1 led to defects in the utilization of lipids, arabinose, glycerol, and ethanol. In glucose medium, the expression of genes involved in lipolysis, long-chain fatty acid degradation, beta-oxidation, and the glyoxylate cycle increased in the Delta smek1 mutant, which is consistent with Delta creA in which a carbon catabolite repressor CREA was deleted. In lipid medium, the expression of genes involved in long-chain fatty acid degradation, beta-oxidation, the glyoxylate cycle, and utilization of arabinose, ethanol, or glycerol decreased in the Delta smek1 mutant, which is consistent with Delta crf1 in which a transcription activator CRF1 required for carbon metabolism was deleted. Lipase activity, however, increased in the Delta smek1 mutant in both glucose and lipid media. Moreover, Smek1 directly interacted with CreA and Crf1, and dephosphorylated CreA and Crf1 in vivo. The phosphatase Smek1 is therefore a dual-function regulator of the lipid and carbohydrate metabolism, and controls fungal development and virulence by coordinating the functions of CreA and Crf1 in carbon catabolite repression (CCR) and derepression (CCDR).

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