›› 2018, Vol. 61 ›› Issue (3): 282-291.doi: 10.16380/j.kcxb.2018.03.003

• 研究论文 • 上一篇    下一篇

松墨天牛Mfe2基因的克隆、原核表达和表达谱分析

柳小龙1,2, 张宾2, 田浩楷2, 宁静2,3, 王海香1,*, 赵莉蔺2,*   

  1. (1. 山西农业大学林学院, 山西太谷 030801; 2. 中国科学院动物研究所农业虫害鼠害综合治理研究国家重点实验室, 北京 100101; 3. 河北大学生命科学学院, 河北保定 071002)
  • 出版日期:2018-03-20 发布日期:2018-03-20

Cloning, prokaryotic expression and expression profiling of Mfe2 from the Japanese sawyer beetle, Monochamus alternatus (Coleoptera: Cerambycidae)

LIU Xiao-Long1,2, ZHANG Bin2, TIAN Hao-Kai2, NING Jing2,3, WANG Hai-Xiang1,*, ZHAO Li-Lin2,*   

  1. (1. College of Forestry, Shanxi Agricultural University, Taigu, Shanxi 080301, China; 2. State Key Laboratory of Integrated Management of Pest Insects and Rodents, Institute of Zoology, Chinese Academy of Sciences, Beijing 100101, China; 3. College of Life Sciences, Hebei University, Baoding, Hebei 071002, China)
  • Online:2018-03-20 Published:2018-03-20

摘要: 【目的】Mfe2为过氧化物酶体多功能酶类型2 (peroxisomal multifunctional enzyme type 2)基因,在脂肪酸的β氧化中起到了极其重要的作用。本研究旨在获得和鉴定松墨天牛Monochamus alternatus的Mfe2基因,原核表达其编码蛋白,并分析其在该虫不同虫态和成虫不同组织中的表达模式。【方法】采用在载体与目的片段之间设计具有重叠区引物的快速克隆方法克隆松墨天牛Mfe2基因,并对克隆所得序列进行生物信息学分析;IPTG诱导原核表达,并以Western blot结果验证Mfe2基因表达的融合蛋白的成功表达;使用RT-qPCR 技术分析这一基因在天牛不同虫态和成虫不同组织中的表达谱。【结果】克隆到松墨天牛Mfe2基因,并命名为MaMfe2(GenBank登录号: MF944109),其ORF序列全长为2 148 bp,编码716个氨基酸,预测分子量大小为77.56 kD。生物信息分析显示,MaMfe2具有AICARFT_IMPCHas保守结构域序列,与光肩星天牛Anoplophora glabripennis过氧化物酶体多功能酶2氨基酸序列一致性最高(为91%)。Western blot检测显示大肠杆菌Escherichia coli BL21(DE3)中MaMfe2表达的蛋白与抗体有特异性结合。发育表达谱结果表明,MaMfe2在松墨天牛蛹期表达量最高,在卵和幼虫期表达量较低;组织表达谱结果表明,在成虫不同组织中,MaMfe2在脂肪体中表达量最高,在前胸中表达量最低。【结论】松墨天牛Mfe2基因MaMfe2编码过氧化物酶体多功能酶,在不同虫态和成虫组织中存在差异表达。本研究为进一步探究该基因在松墨天牛中的功能奠定了基础。

关键词: 松墨天牛, 过氧化物酶体多功能酶基因, 原核表达, Western blot, RT-qPCR

Abstract: 【Aim】 Mfe2, peroxisomal multifunctional enzyme type 2 gene, plays a very important role in the β-oxidation of fatty acids. This study aims to clone and identify the Mfe2 gene from the Japanese sawyer beetle, Monochamus alternatus, to express its encoded protein in prokaryotic expression system, and to explore its expression patterns in different developmental stages and adult tissues of the beetle.【Methods】 The recombinant plasmid was constructed to clone the Mfe2 gene of M. alternatus using the fast cloning method through designing primers with overlapping region between the vector and target fragment, and the cloned sequence was analyzed with various bioinformatics tools. The expressed Mfe2 protein in prokaryotic expression system was inducted with IPTG, and the fusion protein was verified by Western blotting. The expression profiles of this gene in different developmental stages and adult tissues of M. alternatus were investigated using the RT-qPCR technology. 【Results】 Mfe2 was cloned from M. alternatus and named MaMfe2 (GenBank accession no.: MF944109). Its open reading frame is 2 148 bp, encoding a protein of 716 amino acids, with an estimated molecular mass of 77.56 kD. Bioinformatics analysis showed that MaMfe2 has an AICARFT_IMPCHas domain, with 91% amino acid sequence identity with peroxisomal multifunctional enzyme type 2 of Anoplophora glabripennis. The expressed protein in BL21 (DE3) strains of Escherichia coli bound specifically with its antibody in Western blot analysis. Developmental expression profiles showed that the expression level of MaMfe2 was the highest in the pupal stage, and lower in egg and larval stages, and tissue expression profiles revealed that the expression level of MaMfe2 was the highest in the fat body and the lowest in the protothorax of adults. 【Conclusion】 MaMfe2 encodes a peroxisomal multifunctional enzyme in M. alternatus, and its expression level is various in different developmental stages and adult tissues. This study provides the basis for further research on the function of this gene in M. alternatus.

Key words: Monochamus alternatus, peroxisomal multifunctional enzyme gene, prokaryotic expression, Western blot, RT-qPCR