Transcriptomic and Proteomic Insights into the Effect of Sterigmatocystin on Aspergillus flavus

文献类型： 外文期刊

第一作者： Zhao, Yarong

作者： Zhao, Yarong;Zeng, Rui;Chen, Peirong;Huang, Chulan;Xu, Kaihang;Huang, Xiaomei;Wang, Xu;Zhao, Yarong;Zeng, Rui;Chen, Peirong;Huang, Chulan;Xu, Kaihang;Huang, Xiaomei;Wang, Xu

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关键词： Aspergillus flavus; aflatoxins; sterigmatocystin; transcriptome; proteomic

期刊名称：JOURNAL OF FUNGI （ 影响因子：4.7； 五年影响因子：5.2 ）

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年卷期： 2023 年 9 卷 12 期

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收录情况： SCI

摘要： Aspergillus flavus is an important fungus that produces aflatoxins, among which aflatoxin B1 (AFB(1)) is the most toxic and contaminates food and poses a high risk to human health. AFB(1) interacts with another mycotoxin sterigmatocystin (STC), which is also a precursor of AFB(1). Herein, we determined the effect of STC on AFB(1) by evaluating A. flavus transcriptomic and proteomic profiles in the presence or absence of STC by RNA-seq and isobaric tagging, respectively. Overall, 3377 differentially expressed genes were identified by RNA-seq. These genes were mainly associated with the cellular component organisation and biosynthesis, the synthesis of valine, leucine, and isoleucine, and the synthesis of aflatoxin. Clustered genes responsible for AFB(1) biosynthesis exhibited varying degrees of downregulation, and norB expression was completely suppressed in the experimental group. During proteomic analysis, 331 genes were differentially expressed in response to STC. These differentially expressed proteins were associated with cell parts and catalytic and antioxidant activities. Differentially expressed proteins predominantly participated in metabolic pathways associated with aflatoxin biosynthesis, glycolysis/gluconeogenesis, glutathione metabolism, and carbon metabolism. Notably, the upregulated and downregulated enzymes in carbohydrate and glutathione metabolisms may serve as potential gateways for inhibiting aflatoxin biosynthesis. Moreover, twelve proteins including seven downregulated ones involved in aflatoxin biosynthesis were identified; among them, AflG was the most downregulated, suggesting that it may be the key enzyme responsible for inhibiting aflatoxin synthesis. These findings provide novel insights into A. flavus control and the mechanisms regulating mycotoxin production.

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