
松墨天牛GST基因克隆及高温胁迫下的表达特性分析
李子纯, 郝德君, 李慧, 李长燕, 许丹雯仪, 杨华磊, 赵培渊
南京林业大学学报(自然科学版) ›› 2025, Vol. 49 ›› Issue (1) : 28-36.
松墨天牛GST基因克隆及高温胁迫下的表达特性分析
Cloning of glutathione S-transferases gene from Monochamus alternatus and its expression characteristics under heat stress
【目的】克隆松墨天牛(Monochamus alternatus)谷胱甘肽S转移酶(glutathione S-transferases, GST)相关基因,明确GST基因在松墨天牛响应高温胁迫中的效用,为探究亚热带地区松墨天牛的耐热分子机制提供理论依据。【方法】克隆3条松墨天牛GST基因,结合DNAMAN 9.0、I-TASSER等软件分析松墨天牛GST基因的结构特征;利用qRT-PCR技术测定分析松墨天牛成虫和4龄幼虫在不同高温、不同处理时长后GST基因的相对表达量;通过纸盘扩散法验证3条松墨天牛GST基因在保护机体免受氧化应激中的作用。【结果】克隆3条松墨天牛GST基因的cDNA序列,分别命名为MaltGSTe1、MaltGSTe2和MaltGSTt1。MaltGSTe1与MaltGSTe2均属于GST的Epsilon家族,MaltGSTt1属于GST的Theta家族。3条GST基因三维蛋白结构具有指示性结构特征,属于胞质型GST。松墨天牛4龄幼虫在高温胁迫下MaltGSTe1、MaltGSTe2和MaltGSTt1的相对表达量均出现显著变化,MaltGSTe2相对表达水平上调幅度最大;MaltGSTt1在松墨天牛雄虫体内相对表达量出现明显下调;异源表达3条GST基因蛋白的大肠杆菌表现出较强的抗氧化能力,其中,MaltGSTe2具有更强的抗氧化能力。【结论】克隆获得3条松墨天牛GST基因,发现高温胁迫可诱导GST基因表达量上调;纸盘扩散分析结果表明异源表达GST基因蛋白具有抗氧化能力,推测GST基因具有通过保护机体免受氧化应激来参与松墨天牛幼虫的高温胁迫响应机制。
【Objective】To clone the glutathione S-transferases (GST) genes of Monochamus alternatus (Coleoptera: Cerambycidae) and to determine the expression levels of these genes under heat stress in adult males and females, as well as at different developmental stages of M. alternatus, we used molecular biology and bioinformatics methods. 【Method】 Three GST cDNA sequences were cloned, and their structural characteristics were analyzed using DNAMAN 9.0 and I-TASSER software. qRT-PCR was employed to measure the relative expression levels of GST genes in adult and fourth instar larvae of M. alternatus under varying temperatures and treatment durations. The role of these GST genes in protecting the organism from oxidative stress was assessed through disc diffusion assays. 【Result】Three GST cDNA sequences were cloned and named MaltGSTe1, MaltGSTe2, and MaltGSTt1. MaltGSTe1 and MaltGSTe2 belong to the Epsilon family, while MaltGSTt1 belongs to the Theta family. Analysis of three-dimensional protein structures indicated that these GST are cytoplasmic. The relative expression levels of MaltGSTe1, MaltGSTe2 and MaltGSTt1 in fourth instar larvae significantly changed under heat stress, with MaltGSTe2 showing the greatest change. In males, the expression level of MaltGSTt1 was significantly down-regulated. Escherichia coli expressing the GST genes demonstrated enhanced antioxidant capacity, with MaltGSTe2 exhibiting the strongest activity. 【Conclusion】We successfully cloned three GST genes and investigated their expression characteristics under high temperature stress in M. alternatus. High temperature stress was found to induce up-regulation of GST gene expression. Disc diffusion assays confirmed that heterogeneously expressed GST proteins have antioxidant capabilities. These findings suggest that GST genes play a role in the response mechanism to high temperature stress by protecting against oxidative stress, providing a theoretical foundation for exploring the heat resistance mechanisms of M. alternatus in subtropical regions.
松墨天牛 / 高温胁迫 / 谷胱甘肽S转移酶 / GST基因 / 氧化应激 / 基因克隆 / 表达分析 / 生物信息学
Monochamus alternatus / heat stress / glutathione S-transferases / GST gene / oxidative stress / gene clone / express analysis / bioinformatics
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