Glutathione-S-transferases genes-promising predictors of hepatic dysfunction

diseases pathogenesis are genes that encodes the synthesis of glutathione-Stransferase(GST),known as the second phase enzyme detoxification system that protects against endogenous oxidative stress and exogenous toxins,through catalisation of glutathione sulfuric groups conjugation and decontamination of lipid and deoxyribonucleic acid oxidation products.The group of GST enzymes consists of cytosolic,mitochondrial and microsomal fractions.Recently,eight classes of soluble cytoplasmic isoforms of GST enzymes are widely known:α-,ζ-,θ-,κ-,μ-,π-,σ-,andω-.The GSTs gene family in the Human Gene Nomenclature Committee,online database recorded over 20 functional genes.The level of GSTs expression is considered to be a crucial factor in determining the sensitivity of cells to a broad spectrum of toxins.Nevertheless,human GSTs genes have multiple and frequent polymorphisms that include the complete absence of the GSTM1 or the GSTT1 gene.Current review supports the position that genetic polymorphism of GST genes is involved in the pathogenesis of various liver diseases,particularly non-alcoholic fatty liver disease,hepatitis and liver cirrhosis of different etiology and hepatocellular carcinoma.Certain GST allelic variants were proven to be associated with susceptibility to hepatological pathology,and correlations with the natural course of the diseases were subsequently postulated.

芥菜BjGSTF12基因克隆及表达分析

为了探究谷胱甘肽转移酶编码基因(GST)在芥菜花青素积累中的作用,该文以紫薹-绿薹芥菜近等位基因系为材料,克隆到1个花青素积累相关的GST基因,命名为BjGSTF12。该文对BjGSTF12编码蛋白及其启动子进行生物信息学分析,并分析其在绿薹、紫薹芥菜中的表达水平及其与花青素含量的关系。结果表明:(1)BjGSTF12的基因组和cDNA全长分别为808、651 bp,编码216个氨基酸,具有GST_N端和GST_C端保守结构域。然而,绿薹、紫薹芥菜BjGSTF12序列无区别。(2)BjGSTF12与拟南芥AtGSTF12亲缘关系最近,同属于φ亚家族。(3)2个芥菜品系BjGSTF12启动子序列存在4处碱基突变/插入,但二者顺式作用元件种类与数目相同,均含9个MYB结合位点、1个赤霉素响应元件、3个非生物胁迫响应元件。(4)紫薹芥菜花青素含量显著高于绿薹芥菜,BjGSTF12表达水平与花青素含量表现出类似变化规律。(5)互作蛋白网络分析表明,BjGSTF12与花青素合成关键酶、糖基化修饰、转运蛋白等蛋白存在互作。综上认为,BjGSTF12在芥菜薹茎花青素积累中可能发挥重要作用,BjGSTF12可能通过互作蛋白调控芥菜花青素合成、修饰、转运从而影响花青素积累。该文对深入研究GST在芥菜薹茎花青素积累的功能及作用机制奠定了一定理论基础。

Prognostic Significance of Comparison of Clinical Indicators with Manifestations of Genetic Polymorphism of Glutathione-S-Transferases in Non-Small Cell Lung Cancer

The article presented the results of comparison of polymorphic variants of the genes GSTM1, GSTT1, GSTP1 and clinical manifestations of non-small cell lung carcinoma. The association of the genotype GSTT1 (del) with the risk of developing squamous cell lung cancer has been revealed (OR = 2.54 CI: 1.13 - 5.72, p = 0.035). Analysis of patient survival rate (n = 173) in groups of various histological types of lung cancer showed that in the group of squamous cell lung cancer (n = 91) in patients with genotype GSTT1 (del), the survival rate median was significantly higher—84 months (95% CI 12.4 - 155.7) than in patients with the genotype GSTT1 (+)—36 months (95% CI 25.2 - 46.8, p = 0.045). In contrast, in the adenocarcinoma group (n = 82), the survival rate median in patients with the genotype GSTT1 (del) was 19 months. (95% CI 6.2 - 33.5), and in patients with genotype GSTT1 (+)—67 months (95% CI 50.1 - 84.0), which is the basis for continuing this comparison in an additional group of testees, as the sampling did not achieve the reliability of p = 0.12. Hypothetically, these differences may be due to differences in the gender composition of squamous cell lung cancer and adenocarcinoma and the involvement of GST enzymes in the metabolism of estrogens in adenocarcinoma in women and other hormonal background and reactivity of the male body with squamous cell carcinoma. Further research and subsequent analysis of the results will be aimed at confirming this hypothesis.

Carboxylesterase and Glutathione-S-Transferase （GST＇s） Induced Resistance to Bacillus thuringiensis Toxin CrylAb in Rice Leaf Folder, Cnaphalocrocis medinalis （Guenee） Populations

The rice leaf folder （RLF）, Cnaphalocrocis medinalis （Guenee） （lnsecta： Lepidoptera： Pyralidae）, is an important pest, widely distributed in many rice growing areas of Asia. The over-use of broad-spectrum chemical insecticides has been cited as a major cause of outbreaks of C. medinalis as excessive spraying of insecticide disrupts natural biological control insecticides still remain the major control tactics against leaf folder. Carbofuran and fenthion, bendiocarb, acephate, carbosulfan, quinolphos, monocrotophos, phosphamidon and fenvalerate are the common ones used against rice leaf folder. Genetically, modified rice lines expressing B. thuringiensis insecticidal crystal proteins produced are highly tolerant to leidopteran pests. Though economic and environmental benefits of GM crops is well established, the matter of concern is the possibility of target insect pest developing resistance to this B. thuringiensis insecticidal toxins, evident from many laboratory and field experiments against many insect pests. The involvement of GSH S-transferase, carboxylesterase, and microsomal monooxygenase in insecticide resistance has been reported in insecticide-resistant strains of many insect species. Hence, the present study was taken up to monitor for cross resistance between B. thuringiensis cry toxins and synthetic insecticides in larvae of leaf folder as it is mediated by carboxylesterase titre and other enzymes by bioassay for two selected rice leaf folder field populations at the Entomology division of Directorate of Rice Research which showed 2-fold resistance ratio. Qualitative and quantitative changes of carboxylesterase （CarE） and glutathione-s-transferase （GST＇s） were worked out with midguts extracts of the two C. medinalis populations in the presence of a-napthyl acetate and chlorodi-nitro benzene substrates.

Modification of the Genetic Polymorphism of Glutathione-S-Transferase (GSTM1 and GSTT1) in Motorcycle Drivers Exposed to BTEX in Cotonou

The glutathione-S-transferase genes mainly the GSTM1 and GSTT1 alleles are responsible for the synthesis of detoxication enzymes that can remove toxic substances. The objective of this study is to seek changes in the genetic polymorphism of glutathione-S-transferase GSTM1 and GSTT1 in motorcycle drivers exposed to BTEX. Our study group consists of 60 motorcycle drivers including 30 professional and 30 non-professional. Blood samples were preleveled from the study population in the EDTA tubes and DNA was extracted by the phenol/chloroform method. The PCR technique was used to determine the presence or absence of genes. Our results showed that the percentage of GSTM1 null genotype has a statistically significant difference (P = 0.02), while the percentage of GSTT1 null genotype was non-significant (P = 0.76) between the two groups. The percentage of deletion of both genes is higher in professional than non-professional motorcycle drivers. Air pollution in Cotonou by BTEX seems to influence the deletion of the GSTM1 and GSTT1 genes at a higher percentage among professional than non-professional motorcycle drivers.

藜麦GST基因家族鉴定及冷胁迫下表达模式分析

冷胁迫会直接影响植物的生长和发育,并在植物体内不断累积有害物质。谷胱甘肽S-转移酶(glutathione S-transferase, GST)是一种对细胞保护至关重要的抗氧化酶,通过减少活性氧引起的生理性损伤,在生物和非生物应激反应中发挥重要作用。藜麦(Chenopodium quinoa Willd.)中富含蛋白质、氨基酸等对人体有益的物质,但藜麦苗期易受冷空气侵袭而导致减产。因此,鉴定藜麦耐寒相关基因是必要的,为此鉴定藜麦GST基因家族成员,并分析藜麦GST基因在冷胁迫下不同组织中的表达模式。结果表明,在藜麦基因组中共鉴定出59个藜麦GST基因成员,其氨基酸长度范围为199~416 aa,分子量在22.72~47.45 ku范围内,随机分布在14条染色体上,通过系统发育分析将其分为8个亚家族,在启动子区域中分析发现多个低温顺式作用元件(LTR)和多种生长发育及代谢相关的元件。在藜麦GST基因家族中共发现11对串联重复基因和11对片段重复基因,表明基因复制事件是该物种GST基因家族进化的主要驱动力。基因的组织特异性表达分析结果显示,大多数藜麦GST基因在不同持续时间的冷胁迫下可以作出响应,特别是在叶片上高表达。结果可为进一步研究藜麦GST基因功能提供基础,为藜麦耐寒品种选育提供候选基因。

Rapid discovery of a novel “green” and natural GST inhibitor for sensitizing hepatocellular carcinoma to Cisplatin by visual screening strategy

Over-expression of glutathione S-transferase(GST)can promote Cisplatin resistance in hepatocellular carcinoma(HCC)treatment.Hence,inhibiting GST is an attractive strategy to improve Cisplatin sensitivity in HCC therapy.Although several synthesized GST inhibitors have been developed,the side effects and narrow spectrum for anticancer seriously limit their clinical application.Considering the abundance of natural compounds with anticancer activity,this study developed a rapid fluorescence technique to screen“green”natural GST inhibitors with high specificity.The fluorescence assay demonstrated that schisanlactone B(hereafter abbreviated as C1)isolated from Xue tong significantly down-regulated GST levels in Cisplatin-resistant HCC cells in vitro and in vivo.Importantly,C1 can selectively kill HCC cells from normal liver cells,effectively improving the therapeutic effect of Cisplatin on HCC mice by downregulating GST expression.Considering the high GST levels in HCC patients,this compound demonstrated the high potential for sensitizing HCC therapy in clinical practice by down-regulating GST levels.

GST family genes in jujube actively respond to phytoplasma infection

Jujube witches’broom(JWB)caused by phytoplasma has a severely negative effect on multiple metabolisms in jujube.The GST gene family in plants participates in the regulation of a variety of biotic and abiotic stresses.This study aims to identify and reveal the changes in the jujube GST gene family in response to phytoplasma infection.Here,70 ZjGSTs were identified in the jujube genome and divided into 8 classes.Among them,the Tau-class,including 44 genes,was the largest.Phylogenetic analysis indicated that Tau-class genes were highly conserved among species,such as Arabidopsis,cotton,chickpea,and rice.Through chromosome location analysis,37.1%of genes were clustered,and 8 of 9 gene clusters were composed of Tau class members.Through RT-PCR,qRT-PCR and enzyme activity detection,the results showed that the expression of half(20/40)of the tested ZjGSTs was inhibited by phytoplasma infection in field and tissue culture conditions,and GST activity was also significantly reduced.In the resistant and susceptible varieties under phytoplasma infection,ZjGSTU49-ZjGSTU54 in the cluster IV showed opposite expression patterns,which may be due to functional divergence during evolution.Some upregulated genes(ZjGSTU45,ZjGSTU49,ZjGSTU59,and ZjGSTU70)might be involved in the process of jujube against JWB.The yeast two-hybrid results showed that all 6 Tauclass proteins tested could form homodimers or heterodimers.Overall,the comprehensive analysis of the jujube GST gene family revealed that ZjGSTs responded actively to phytoplasma infection.Furthermore,some screened genes(ZjGSTU24,ZjGSTU49-52,ZjGSTU70,and ZjDHAR10)will contribute to further functional studies of jujube-phytoplasma interactions.

Systematic analysis and functional verification of citrus glutathione S-transferases reveals that CsGSTF1 and CsGSTU18contribute negatively to citrus bacterial canker

Citrus bacterial canker(CBC) is resulted from Xanthomonas citri subsp. citri(Xcc) infection and poses a significant threat to citrus production.Glutathione S-transferases(GSTs) are critical in maintaining redox homeostasis in plants, especially in relation to abiotic and biotic stress responses. However, the function of GSTs in resisting CBC remains unclear. Here, citrus glutathione S-transferases were investigated applying a genome-wide approach. In total, 69 CsGSTs belonging to seven classes were identified, and the phylogeny, chromosomal distribution, gene structures and conserved motifs were analyzed. Several CsGSTs responded to Xcc infection, as observed in the upregulation of CsGSTF1 and CsGSTU18 in the CBC-sensitive ‘Wanjincheng' variety but not in the resistant ‘Kumquat' variety. CsGSTF1 and CsGSTU18 were localized at the cytoplasm. Transient overexpression of CsGSTF1 and CsGSTU18 mediated reactive oxygen species(ROS) scavenging, whereas the virus-induced gene silencing(VIGS) of CsGSTF1 and CsGSTU18 caused strong CBC resistance and ROS burst. The present study investigated the characterization of citrus GST gene family, and discovered that CsGSTF1 and CsGSTU18 negatively contributed to CBC through modulating ROS homeostasis. These findings emphasize the significance of GSTs in infection resistance in plants.

壬基酚对牙鲆肝脏EROD和GST酶活性的影响

乙氧基-异酚恶唑脱乙基酶(EROD)和谷胱甘肽转移酶(GST)是动物体内主要的解毒酶,在外源毒物的转化和代谢过程中具有重要作用。本文应用牙鲆肝脏组织中的EROD和GST酶活性作为生物标志物,研究了不同浓度的壬基酚(0,0.10,0.33和1.00 mg·L^(-1))活体暴露下2种酶的活性响应特征。结果表明,与对照组相比,暴露于低浓度(0.10和0.33 mg·L^(-1))的壬基酚中,EROD和GST酶活性均被诱导,暴露4 d后0.33 mg·L^(-1)的壬基酚处理组中EROD和GST活性的诱导率分别为99.2%和127.5%。暴露于高浓度(1.00 mg·L^(-1))的王基酚中。2种酶的活性均被抑制,4 d后EROD和GST酶活性的抑制率分别为62.0%和37.3%。该试验表明,EROD和GST酶活性的响应可用来评价环境中壬基酚的污染效应。

镉胁迫下两种水稻GSH和GST应答差异的研究

还原型谷胱甘肽(GSH)和谷胱甘肽转硫酶(GST)是水稻解毒系统中的重要组成部分。采用水培法研究了耐性不同的两种水稻(特优559和K优818)在不同程度镉(Cd)胁迫下GSH和GST的变化情况。结果表明,Cd处理导致两种水稻生物量减少、Cd吸收积累增加,水稻根部Cd含量和积累量均高于地上部,但Cd从水稻根部向地上部的转运存在明显的种间差异,耐性较弱的特优559的Cd转移率(S/R)随处理Cd浓度提高而上升,而耐性较强的K优818则恰好相反,将Cd更多地钝化在根部。两种水稻GSH和GST的变化趋势也有所不同,Cd胁迫使特优559的GSH含量和GST活性显著增加,而K优818的GSH在低浓度Cd处理时出现了小幅下降,但其GST活性变化与特优559相似,根部增幅更为显著。以上结果说明,水稻GSH和GST在Cd解毒和钝化过程中发挥了重要的作用,而且其应答机制存在着一定的基因型差异,这可能与两品种GST同功酶的组成、表达和功能不同有关。

GST-NAP融合蛋白可溶性表达及柱上切割GST标签

利用基因工程的方法,以实验室保存的p MAL-C2X-NAP质粒为模板,PCR扩增NAP基因,构建重组质粒p GEX-NAP.重组质粒通过酶切和测序鉴定后转化大肠杆菌表达菌株BL21(DE3),再经IPTG低温诱导获得可溶性GST-NAP融合蛋白,最后利用谷胱甘肽琼脂糖凝胶树脂进行纯化,Prescission蛋白酶进行柱上切割去除GST标签.结果表明,p GEX-NAP重组质粒构建正确,在大肠杆菌中经IPTG低温诱导表达,可获得大量可溶性GST-NAP融合蛋白.Prescission蛋白酶柱上切割去除GST标签后,经Western Blot验证NAP蛋白能被兔抗NAP多克隆抗体特异识别.

重组日本血吸虫26kDa GST抗原诱导水牛产生抗体及减少排卵的初步观察

目的 观察rSjc2 6GST抗原诱导水牛产生特异性抗体水平以及排卵数量的减少。 方法 2 0头水牛随机分为两组 ,每组 1 0头。试验组免疫rSjc2 6GST抗原 ,对照组注射佐剂 ,攻击感染日本血吸虫尾蚴后 ,定期检测抗rSjc2 6GST抗体、粪检虫卵和毛蚴。 结果 水牛免疫rSjc2 6GST抗原后 1个月 ,产生抗rSjc2 6GST抗体 ,至 1 2个月一直维持较高水平。试验组水牛感染后 50～ 90d,粪便EPG和MPG几何均值明显低于对照组 ,但在 1 0 0d以后两组的EPG和MPG均逐渐降低 ,至 330d均为 0。结论 水牛免疫rSjc2 6GST抗原后能产生特异性抗体 ,维持较高水平至 1 2个月 ,在感染后 3个月内有显著的减卵效果 。

食蚊鱼(Gambusia afinis)cat、gapdh和gst基因的克隆及其在生态毒理学中的应用

根据Ensembl、Genbank登录的鱼类cat、gapdh和gst基因的CDS序列设计普通PCR扩增引物,寻找食蚊鱼的cat、gapdh和gst基因的c DNA片段,并根据定量引物设计要求设计出相应的SYBR Green I荧光定量RT-q PCR引物,建立了食蚊鱼cat、gapdh和gst基因的SYBR Green I荧光定量RT-q PCR方法。该方法在104~108数量级范围内有良好线性关系(R=0.999~1.000);熔解曲线显示扩增产物特异性良好,均为单一峰值;质粒标准品最高浓度与最低浓度的批内试验变异系数与批间试验变异系数均低于2%。利用该方法监测和评价环境污染物对水生生物的影响,选择了水体中常见典型药物污染物——双氯芬酸,研究其对食蚊鱼抗氧化基因表达的影响。结果表明,雌性食蚊鱼暴露在不同浓度双氯芬酸钠(0.005、0.05、0.5和5 mg·L-1)24 h后,其肝脏cat、gapdh和gst的mRNA呈现显著变化,相对于对照组,在低浓度0.005 mg·L-1时,cat与gst mRNA的表达量均有极显著上升(p<0.01),而其它浓度均极显著下降(p<0.01)。试验表明该方法具有快速、精确、灵敏度高的优点,可为利用该类小型鱼类的原位污染物的生物监测和生态毒理评价提供有力的技术支持。

多氯联苯(PCB_(1254))对栉孔扇贝消化盲囊和鳃丝EROD、GST酶活力的影响

研究了4种质量浓度(0.5μg/L、1μg/L、10μg/L、50μg/L)PCB1254暴露下,栉孔扇贝(Chlamysferrari)消化盲囊和鳃丝7-乙氧基-3-异吩唑酮-脱乙基酶(EROD)、谷胱甘肽转移酶(GST)活力的变化。于实验开始后0、0.5d、1d、3d、6d、9d、15d、21d、30d取样测定,结果显示,除鳃丝EROD活力在低质量浓度(0.5μg/L和1.0μg/L)随时间变化不明显(P>0.05)外,其他各处理组PCB1254对栉孔扇贝消化盲囊和鳃丝的EROD都具有明显的激活作用,而且具有明显的剂量-效应关系。低浓度(0.5μg/L、1.0μg/L)处理下,消化盲囊和鳃丝的GST活力都呈现激活的趋势,而高浓度(10μg/L、50μg/L)下,GST活力都呈现先上升后下降的趋势,且鳃丝GST活力变化幅度较为明显。结果表明,EROD和GST活力的变化在一定程度上能够反应PCBs对栉孔扇贝影响的规律性,是合适的毒理学指标,栉孔扇贝是比较好的评价多氯联苯污染的指示生物,本研究也对栉孔扇贝对多氯联苯的生物转化机制作了初步的探讨。

日本血吸虫DNA多价疫苗SjGST-FABP/pcDNA3的构建及其保护性免疫研究

目的构建日本血吸虫DNA多价疫苗SjGST-FABP/pcDNA3,用以免疫小鼠,观察其在小鼠抗血吸虫感染中的免疫保护作用。方法根据质粒pGEX-4T-1中SjGST-ORF和SjFABP基因序列,利用基因重组、PCR等技术将SjGST和SjFABP编码基因拼接在一起,得到融合基因SjGST-FABP,将融合基因SjGST-FABP定向克隆到pcDNA3多克隆位点上,转化大肠杆菌,经质粒扩增和DNA序列测定后,进行小鼠动物免疫和日本血吸虫尾蚴攻击感染及免疫保护性评价。结果成功构建了日本血吸虫DNA多价疫苗SjGST-FABP/pcDNA3。免疫小鼠获得42.39%的减虫率和56.09%肝减卵率(P<0.05)。结论日本血吸虫DNA多价疫苗SjGST-FABP/pcDNA3可诱导部分抗血吸虫尾蚴攻击感染的免疫保护效果,具有疫苗研究与开发价值。

小麦抗白粉病相关基因GST克隆与表达

以从小麦抗白粉病相关基因差异表达分析中获得的EST-3(Genbank序列号EX567360)为标签,采用电子克隆的方法对其进行延伸,并对电子克隆结果进行半定量RT-PCR验证,最后对白粉菌不同侵染时间进行了表达分析。经RT-PCR扩增,EST-3表达的带型变化趋势与其在抑制性消减杂交SSH-cDNA的差异显示情况一致,且RT-PCR获得的序列与电子克隆的序列一致性达98%。生物信息学分析表明,该序列是由875bp核苷酸组成的,具有完整的开放阅读框架,编码蛋白为229个氨基酸,GenBank序列号JK841279,含有一个N端和C端谷胱甘肽硫转移酶结构域,该序列与小麦谷胱甘肽硫转移酶基因(GST)一致性较高,达97%。表达分析结果显示,白粉菌侵染24h表达受到抑制,48h开始表达,侵染72h表达最强,96h又开始下降,表明GST基因属于白粉菌诱导型相关基因,参与小麦对白粉病的应答反应。

苯并芘B[a]P对泥蚶组织EROD、GST酶活力和MDA含量的影响

摘要：采用实验生态学的方法，通过染毒和清除，研究了不同浓度（0．05、0．5、5和10μg／L）苯并芘B[a]P胁迫15d和释放15d后，泥蚶（Tegillarcag阳n0J日）消化盲囊和鳃丝乙氧基异吩嗯唑脱乙基酶（EROD）、谷胱甘肽转移酶（GST）活力和脂质过氧化物（MDA）含量的变化。结果表明：在胁迫阶段0．5、5和10I．tg／L，B[a]P处理组对泥蚶消化盲囊和鳃丝EROD、GST酶活力和MDA含量显著影响（P〈O．05），EROD、GST酶活力分别被诱导和抑制，第5d趋于稳定，MDA含量随时间呈上升趋势，在第10d基本达到峰值并趋于稳定。在清除阶段，EROD活力和MDA含量逐渐下降，GST活力逐渐升高，并在5—10d恢复到对照组水平。本研究中，EROD和GST活力的变化能够反映机体解毒代谢的能力，MDA含量的变化反映了机体氧化损伤的程度，表现出了一定的剂量和时间效应。

多溴联苯醚胁迫下鲫鱼肝脏微粒体CYP3A1和GST的响应

以鲫鱼Carassius auratus Linn．为试验鱼类，研究了其暴露于不同质量浓度的2，2’，4，4’-四溴联苯醚（PBDE-47）和十溴联苯醚（PBDE-209）后鱼肝微粒体中CYP3A1和GST酶活性的动态变化。结果表明，鲫鱼在0．10～5．00mg·L-1的PBDE．47和5．00～50．0mg·L0的PBDE-209中暴露15d后，除0．10mg·L-1 PBDE．47、5．00mg·L-1和10．0mg·L-1PBDE-209试验组外，其余各试验组的鱼肝微粒体中CYP3A1被诱导，呈显著的剂量-效应关系。CYP3A1的活性随着作用时间的延续而上升，到试验第15天时达到最高，但上升速率最快的阶段为试验的第0-5天。而GST酶则表现出不同的特点，呈先升高后降低的趋势。经过15d试验，除0．10mg·L-1PBDE-47和5．00mg·L-1PBDE-209以外的各试验组鲫鱼肝脏微粒体中的GST活性仅为对照组的12．74％～85．35％，表明PBDEs已对鱼体肝脏GST产生了较为严重的影响。研究表明，鱼类肝脏微粒体中CYP3AI和GST酶可作为污染生物标志物来评价PBDEs的早期污染毒理效应。

家蚕谷光甘肽-S-转移酶GSTe3基因的鉴定及其真核表达

【目的】谷胱甘肽-S-转移酶(Glutathiones S-tansferases,GSTs)是一类由多基因编码的多功能同工酶超家族,在解毒内源和外源性有毒物质中起着重要作用,家蚕GSTs的研究,可为解析家蚕解毒机制奠定基础。【方法】利用生物信息学和分子生物学方法克隆和分析家蚕GSTe3(BmGSTe3),利用RT-PCR分析该基因在家蚕体内的表达情况,利用重组杆状病毒真核表达系统在sf9细胞中真核表达BmGSTe3。【结果】在家蚕中克隆了家蚕的GSTe3,该基因由5个外显子与4个内含子组成,外显子总长度为512bp,属于昆虫特异的Epsilon家族。BmGSTe3包含N-末端和C-末端2个结构域,N-末端由β-α-β-α-β-β-α共7个结构基序组成,而C-末端则由5个α螺旋构成,在启动子上游2500bp区域内共发现了15个可能的转录调控元件。BmGSTe3的表达具有较高的组织特异性,它只在家蚕血液和头部表达。BmGSTe3在sf9细胞中表达的BmGSTe3蛋白具有较好的GSTs酶活性。【结论】BmGSTe3属于昆虫特异的Epsilon家族,其蛋白具有较好的GSTs酶活性。