Autophagy-related protein UvAtg7 contributes to mycelial growth, virulence, asexual reproduction and cell stress response in rice false smut fungus Ustilaginoidea virens

文献类型： 外文期刊

第一作者： Yu, Junjie

作者： Yu, Junjie;He, Xiang;Yu, Mina;Song, Tianqiao;Cao, Huijuan;Pan, Xiayan;Qi, Zhongqiang;Du, Yan;Zhang, Rongsheng;Liang, Dong;Liu, Yongfeng;Xu, Cunfa;Liu, Yongfeng

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关键词： Autophagy; Atg7; Virulence; Conidium; Chlamydospore; Ustilaginoidea virens

期刊名称：FUNGAL GENETICS AND BIOLOGY （ 影响因子：3.883； 五年影响因子：3.931 ）

ISSN： 1087-1845

年卷期： 2022 年 159 卷

页码：

收录情况： SCI

摘要： Autophagy is a conserved mechanism for nutrient and cytoplasmic components recycling in eukaryotic cell, in which E1-like enzyme Atg7 activates ubiquitin-like conjugation in the autophagy pathway. In plant pathogenic fungi Ustilaginoidea virens, UvAtg7, an ortholog of AAtg7 in baker's yeast was identified and functionally investigated. UvAtg7 was confirmed to be essential for autophagy, because the disruption of UvATG7 gene in U. virens completely blocked the fusion of autophagosome-like into vacuoles and catalytic degradation of GFP-UvAtg8 under N-starving condition. The fluorescent signal indicated UvAtg7 protein was dispersed in cytoplasma, but spatially coordinated with core autophagy protein UvAtg8 on occasion. Interestingly, disruption of UvATG7 in U. virens caused slightly reduction in mycelial growth, but resulted in a considerable decrease in virulence, conidia production in YT broth and chlamydospore formation on rice false smut balls. Moreover, the UvATG7 deletion mutants exhibited increased sensitivity to cell wall integrity stress caused by congo red and calcofluor white, meanwhile the UvATG7 deletion mutants showed decreased sensitivity to osmotic stress, cell membrane stress and reactive oxygen stress caused by sorbitol, sodium dodecyl sulfate and H2O2, respectively. All of these defects in UvATG7 deletion mutants could be partially or completely restored by gene complementation. In general, our study indicates that UvAtg7 is essential in autophagy pathway and contributes to mycelial growth, virulence, asexual reproduction and cell stress response in U. virens.

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