中国农业科学 ›› 2025, Vol. 58 ›› Issue (18): 3648-3663.doi: 10.3864/j.issn.0578-1752.2025.18.006

• 植物保护 • 上一篇    下一篇

玉米大斑病菌热激蛋白HSP 9/12基因的克隆与表达分析

张淑红1(), 高凤菊1, 武秋颖1, 纪景欣1, 张运峰1, 许可1, 谷守芹2, 范永山1()   

  1. 1 唐山师范学院生命科学系/河北省植物生物技术研究与应用重点实验室/唐山市农业病原真菌与毒素重点实验室,河北唐山 063000
    2 河北农业大学生命科学学院/河北省农业微生物生物信息利用技术创新中心,河北保定 071000
  • 收稿日期:2025-05-18 接受日期:2025-06-15 出版日期:2025-09-18 发布日期:2025-09-18
  • 通信作者:
    范永山,E-mail:
  • 联系方式: 张淑红,E-mail:zsh3535@163.com。
  • 基金资助:
    国家自然科学基金(22078171); 中央引导地方科技发展资金(246Z3610G); 唐山市科技计划(23130221E); 唐山师范学院科研项目(20256129033)

Cloning and Expression Analysis of Heat Shock Protein HSP 9/12 Genes in Setosphaeria turcica

ZHANG ShuHong1(), GAO FengJu1, WU QiuYing1, JI JingXin1, ZHANG YunFeng1, XU Ke1, GU ShouQin2, FAN YongShan1()   

  1. 1 Department of Life Sciences, Tangshan Normal University/Hebei Key Laboratory of Plant Biotechnology Research and Application/ Tangshan Key Laboratory of Agricultural Pathogenic Fungi and Toxins, Tangshan 063000, Hebei
    2 College of Life Sciences, Hebei Agricultural University/Hebei Bioinformatic Utilization and Technological Innovation Center for Agricultural Microbes, Baoding 071000, Hebei
  • Received:2025-05-18 Accepted:2025-06-15 Published:2025-09-18 Online:2025-09-18

摘要:

【目的】克隆玉米大斑病菌(Setosphaeria turcica)非ACD结构域类小分子热激蛋白HSP 9/12基因,分析其在病菌发育、侵染和HT-毒素诱导过程中的表达模式。【方法】在玉米大斑病菌全基因组范围内筛选并克隆热激蛋白HSP 9/12基因,利用生物信息学方法进行编码蛋白的理化性质分析、亚细胞定位、结构预测和系统发育分析,利用RNA-seq和RT-qPCR分析HSP 9/12基因在玉米大斑病菌发育、侵染和HT-毒素诱导过程中的表达情况。【结果】从玉米大斑病菌基因组筛选并克隆到两个HSP 9/12基因,其编码蛋白分别含有99和100个氨基酸,根据分子量分别命名为StHsp10.1StHsp10.7。理化性质分析表明,两个HSP 9/12均为亲水蛋白,亚细胞定位预测均为细胞质并含有核定位信号,无跨膜结构域和信号肽,均含有HSP9_HSP12(PF04119)结构域;StHSP10.1为酸性不稳定蛋白,StHSP10.7为碱性稳定蛋白,均以α-螺旋为主导的二级和三级结构形式存在;StHSP10.1与酿酒酵母(Saccharomyces cerevisiae)HSP12亲缘关系较近,StHSP10.7与粟酒裂殖酵母(Schizosaccharomyces pombe)HSP9亲缘关系较近。StHSP10.1在分生孢子发育期表达量最高,其次为菌丝、附着胞和侵入钉,芽管表达量较低;玉米大斑病菌接种后StHSP10.1表达量迅速上升,接种72 h时的FPKM达到接种24 h的6.37倍;HT-毒素诱导过程中的RT-qPCR分析结果表明,随着诱导时间增加,StHSP10.1在野生型菌株(WT)中相对基因表达量显著上升,诱导14、21和28 d分别为7 d的2.9、14.1和39.8倍,但在STK1基因敲除突变体(ΔSTK1)中表达量均极低;StHSP10.7在玉米大斑病菌发育阶段、侵染过程和HT-毒素诱导过程中均表达量极低。AlphaFold 3预测显示,StHSP10.1转录起始位点上游-38—-24 bp区域同时存在TATA-box、细胞分化蛋白RCD1结合位点和bZIP转录因子StbZIP11结合位点;利用STRING在线网站构建StHSP10.1蛋白质互作网络,发现2条StHSP10.1调控路径:Ras1→STK1→StbZIP11→StHSP10.1和Ras1→UBE2→CUE1→RCD1-like→StHSP10.1,推测分别在HT-毒素合成和胁迫诱导方面发挥重要作用。【结论】玉米大斑病菌HSP 9/12基因的表达模式存在显著差异,StHSP10.1是病菌发育、侵染和HT-毒素诱导过程中的关键调控基因,而StHSP10.7无调控作用。

关键词: 玉米大斑病菌, HSP 9/12, 小分子热激蛋白, 基因克隆, 转录调控

Abstract:

【Objective】The objective of this study is to clone HSP 9/12 genes of small heat shock proteins without ACD domain from Setosphaeria turcica and analyze their expression patterns during fungal development, infection, and HT-toxin induction processes. 【Method】The coding genes of heat shock protein HSP 9/12 were screened and cloned from the whole genome of S. turcica. Bioinformatics methods were employed to analyze the physicochemical properties, subcellular localization, structural prediction, and phylogenetic analysis of HSP 9/12 proteins. RNA-seq and RT-qPCR were used to examine the expression of HSP 9/12 genes during fungal development, infection, and HT-toxin induction. 【Result】Two HSP 9/12 genes were screened and cloned from the S. turcica genome, encoding proteins with 99 and 100 amino acids, respectively. Based on their molecular weights, they were named StHsp10.1 and StHsp10.7. Physicochemical analysis revealed that both HSP 9/12 proteins are hydrophilic, with subcellular localization predictions indicating they are located in the cytoplasm with nuclear localization signals. They lack transmembrane domains and signal peptides, and both contain the HSP9_HSP12 (PF04119) domain. StHSP10.1 is an acidic unstable protein, while StHSP10.7 is an alkaline stable protein, both existing predominantly in α-helix-dominated secondary and tertiary structural forms. StHSP10.1 shows closer phylogenetic relationship with Saccharomyces cerevisiae HSP12, whereas StHSP10.7 exhibits closer affinity to Schizosaccharomyces pombe HSP9. The StHSP10.1 exhibited the highest expression during conidial development, followed by hypha, appressoria, and penetration peg, with the lowest expression in germ tubes. After inoculation, the fungal StHSP10.1 expression rapidly increased, reaching 6.37-fold higher FPKM at 72 h compared to 24 h post inoculation. The results of RT-qPCR analysis during the HT-toxin induction process showed that, as the induction time increased, the relative gene expression level of StHSP10.1 in the wild-type strain (WT) significantly increased being 2.9-, 14.1-, and 39.8-fold higher at 14, 21, and 28 d compared to 7 d, respectively, but remained extremely low in the STK1 gene knockout mutant (ΔSTK1). StHSP10.7 showed extremely low expression levels during fungal development, infection, and HT-toxin induction. AlphaFold 3 predicted that the region from -38 to -24 bp upstream of the transcription start site of the StHSP10.1 contains TATA-box, and binding sites for cell differentiation proteins RCD1 and bZIP transcription factor StbZIP11, simultaneously. Using the STRING online platform to construct the protein-protein interaction network for StHSP10.1, two regulatory pathways of StHSP10.1 were proposed: Ras1→STK1→StbZIP11→StHSP10.1 and Ras1→UBE2→CUE1→RCD1-like→StHSP10.1, suggesting important roles in HT-toxin synthesis and stress induction, respectively. 【Conclusion】There are significant differences in the expression patterns of HSP 9/12 genes in S. turcica. StHSP10.1 serves as a key regulatory gene in the processes of pathogen development, infection, and HT-toxin induction, whereas StHSP10.7 has no regulatory effect.

Key words: Setosphaeria turcica, HSP 9/12, small heat shock protein (sHSP), gene cloning, transcriptional regulation