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Chilling stress reduced protein translation by the ubiquitination of ribosomal proteins in Volvariella volvacea

文献类型： 外文期刊

作者： Gong, Ming 1 ; Li, Zhengpeng 1 ; Wan, Jianing 1 ; Chen, Mingjie 1 ; Wang, Hong 1 ; Shang, Junjun 1 ; Zhou, Sichi 1 ; Tan, 1 ;

作者机构： 1.Shanghai Acad Agr Sci, Natl Engn Res Ctr Edible Fungi, Inst Edible Fungi, Key Lab Edible Fungi Resources & Utilizat South,M, Shanghai 201403, Peoples R China

2.Nanjing Forestry Univ, Coll Light Ind & Food Engn, Dept Food Sci & Technol, Nanjing 210037, Peoples R China

关键词： Volvariella volvacea; Autolysis; Ubiquitination; Chilling stress; Ribosome

期刊名称：JOURNAL OF PROTEOMICS （ 影响因子：4.044； 五年影响因子：4.02 ）

ISSN： 1874-3919

年卷期： 2020 年 215 卷

页码：

收录情况： SCI

摘要： In Volvariella volvacea, an important edible mushroom species, cryogenic autolysis is a typical part of abnormal metabolism; however, the underlying mechanisms remain unclear. Ubiquitylome analysis revealed that chilling stress (CS) affected protein translation and degradation by ubiquitination. Comparative proteomics analysis showed that CS downregulated protein expression in V. volvacea V23 instead of VH3 (improved chilling stress resistance strain). The integrative ubiquitylome, proteomics, and transcriptome analyses indicated that CS reduced protein translation by the ubiquitination of ribosomal proteins. An activity assay of the 20S proteasome showed that CS decreased the degradation efficiency of the ubiquitin-proteasome system. UBEV2, one type of ubiquitin-conjugating enzyme E2 (UBE2) in V. volvacea, was upregulated after cold stress treatment using western blot analysis. GST pull-down experiments of UBEV2 provided evidence that CS affected protein translation by the ubiquitination of ribosomal proteins. Co-IP experiments confirmed that UBEV2 bound to the ubiquitinated SSB2, a ribosome-associated molecular chaperone. An anti-freezing experiment demonstrated that the UBE2 inhibitor could improve the cold stress resistance of V. volvacea. Our observations revealed that CS triggered ubiquitination-mediated autolysis associated with a decrease in protein translation and highlighted the mechanistic role of UBEV2 in facilitating cryogenic autolysis in V. volvacea. Significance: Volvariella volvacea, the edible straw mushroom, is a highly nutritious food source widely cultivated on a commercial scale in tropical and subtropical regions. The challenges associated with the cryogenic autolysis preservation of V. volvacea have limited its marketability. This issue of cryogenic autolysis is both an interesting scientific problem to solve and a practical economic matter. Integrative ubiquitylome, proteomics, and transcriptome analyses, together with GST pulldown and Co-IP experiments, indicated that chilling stress reduced protein translation by the ubiquitination of ribosomal proteins in V. volvacea. This study significantly contributes to our understanding of ubiquitination-mediated autolysis associated with a decrease in protein translation in V. volvacea. Our data highlight the mechanistic role of UBEV2 in facilitating the cryogenic autolysis of V. volvacea. We provided a new idea for the preservation of V. volvacea by inhibiting UBEV2 to increase its marketability.

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