河南农业科学 ›› 2023, Vol. 52 ›› Issue (3): 127-134.DOI: 10.15933/j.cnki.1004-3268.2023.03.014

• 畜牧·兽医 • 上一篇    下一篇

猪伪狂犬病病毒gE 蛋白的真核表达及其活性鉴定

王清龙1,王瑞宁1,2,王勋2,3,李青梅2,李鸽4,张真真3,杨苏珍2,郭军庆2,张改平2,3,5
  

  1. (1.河南牧业经济学院,河南 郑州 450011;2.河南省农业科学院 动物免疫学重点实验室,河南 郑州 450002;3.河南农业大学 动物医学院,河南 郑州 450002;4.西北农林科技大学 动物医学院,陕西 杨凌 712100;5.扬州大学江苏高校动物重要疫病与人兽共患病防控协同创新中心,江苏 扬州 225009)
  • 收稿日期:2022-08-08 出版日期:2023-03-15 发布日期:2023-04-17
  • 通讯作者: 张改平(1960-),男,河南内黄人,研究员,中国工程院院士,博士,主要从事动物免疫学研究。E-mail:zhanggaiping2003@163.com 郭军庆(1970-),男,河南林州人,教授,博士,主要从事动物免疫学研究。E-mail:13838248132@163.com
  • 作者简介:王清龙(1978-),男,河南社旗人,副教授,主要从事生物化学研究。E-mail:zzmzwql@163.com
  • 基金资助:
    河南省重大科技专项(221100110600);河南省农业科学院科技创新团队项目(2022TD02)

Eukaryotic Expression of Porcine Pseudorabies Virus gE Protein and Identification of Its Activity

WANG Qinglong1,WANG Ruining1,2,WANG Xun2,3,LI Qingmei2,LI Ge4,ZHANG Zhenzhen3,YANG Suzhen2,GUO Junqing2,ZHANG Gaiping2,3,5   

  1. (1.Henan University of Animal Husbandry and Economy,Zhengzhou 450011,China;2.Key Laboratory of Animal Immunology,Henan Academy of Agricultural Sciences,Zhengzhou 450002,China;3.College of Veterinary Medicine,Henan Agricultural University,Zhengzhou 450002,China;4.College of Veterinary Medicine,Northwest Agriculture and Forestry University,Yangling 712100,China;5.Jiangsu Co‑innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses,Yangzhou University,Yangzhou 225009,China)
  • Received:2022-08-08 Published:2023-03-15 Online:2023-04-17

摘要: 为制备猪伪狂犬病病毒(PRV)gE重组蛋白并评估其抗原活性,将优化的PRV gE 基因胞外区插入真核表达载体pCMV并在其C端加入Hexa-His标签,构建真核表达质粒pCMV-gE;将重组质粒转染HEK293F细胞,Dot blot鉴定转染细胞中gE重组蛋白的分泌表达;利用镍亲和层析和凝胶过滤层析从转染细胞培养上清中纯化gE表达蛋白;以SDS-PAGE和Western blot鉴定gE重组蛋白,利用PRV阳性血清以ELISA分析gE重组蛋白的抗原活性,通过去糖基化酶PNGase F鉴定其糖基化修饰及其对抗原活性的影响。Dot blot结果显示,gE重组蛋白通过自身信号肽实现在细胞培养上清的分泌表达,其表达量在转染96 h达到峰值。SDS-PAGE和Western blot结果显示,从细胞培养上清中纯化获得gE重组蛋白纯度约为90%,经去糖基化酶PNGase F处理的gE重组蛋白分子质量显著降低。间接ELISA结果显示,gE重组蛋白检测PRV阳性血清的抗体效价为1∶12 800;PRV阳性血清对gE蛋白的检出限为31.25 ng/mL,其抗原活性是原核表达的4倍。对临床血清的检测结果显示,基于gE重组蛋白的ELISA与IDEXX抗体检测试剂盒的符合率为96.5%。综上,在真核细胞中分泌表达了具有高表达量、高纯度、高活性和糖基化修饰的gE重组蛋白,在PRV感染鉴别检测中具有良好的应用潜力。

关键词: 猪伪狂犬病病毒, gE蛋白, 分泌表达, 糖基化修饰, 抗原活性

Abstract: In order to obtain the recombinant gE protein of porcine pseudorabies virus(PRV)and evaluate its antigenic activity,the optimized extracellular region of gE gene was inserted into the eukaryotic expression vector pCMV and the Hexa‑His tag was added to its C‑terminal to construct the eukaryotic expression plasmid pCMV‑gE.HEK293F cells were transfected with the recombinant plasmid,and secretory expression of the gE recombinant protein in the transfected cells was identified by Dot blot.The expressed gE protein was then purified from supernatant of the transfected cells by nickel affinity chromatography and gel chromatography,which was identified by SDS‑PAGE and Western blot.Furthermore,the antigenic activity of the gE recombinant protein was analyzed by ELISA using the PRV positive serum,and its glycosylation modification as well as its effect on the antigenic activity was analyzed by PNGase F treatment.Dot blot results showed that the gE recombinant protein was secreted and expressed in supernatant of the transfected cells through its own signal peptide,which reached its peak at 96 h post‑transfection.The results of SDS‑PAGE and Western blot showed that the purity of the gE recombinant protein purified from the cell supernatant was about 90%.Molecular weight of the gE recombinant protein after treated with disaccharidase PNGase F was significantly lower than that of the untreated protein.The indirect ELISA results showed that the gE recombinant protein detected PRV positive serum at 1∶12 800,while the detection limit of PRV positive serum for the expressed gE protein was determined as 31.25 ng/mL,whose antigen activity was four times that of the prokaryotically expressed protein.The detection of clinical serums showed that the coincidence rate between the gE‑based ELISA and IDEXX antibody detection kit was 96.5%.In conclusion,the recombinant gE protein with high expression level,high purity,high activity and glycosylation modification was secreted and expressed in eukaryotic cells,showing a good application potential in the differential detection of PRV infection.

Key words: Porcine pseudorabies virus, gE protein, Secretory expression, Glycosylation modification, Antigen activity

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