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支气管败血波氏菌截短BcfA表达的重组蛋白及其免疫活性分析

2021-07-23朱伟峰谭凯王芳程序仇汝龙范志宇陈露

江苏农业学报 2021年3期

朱伟峰 谭凯 王芳 程序 仇汝龙 范志宇 陈露

摘要: 为提高支气管败血波氏菌保护性抗原BcfA重组蛋白的表达量和可溶性,对编码BcfA N端373位氨基酸残基之后的BcfA基因碱基序列进行了克隆和表达,截短后的BcfA表达量提高了10倍,且主要为可溶性表达。Western blot结果显示,截短BcfA表达后的重组蛋白与支气管败血波氏菌感染康复血清反应依然明显。免疫保护力试验结果表明截短BcfA表达的重组蛋白依然对支气管败血波氏菌表现出良好的免疫保护作用。

关键词: 支气管败血波氏菌;波氏菌黏附因子A(BcfA);截短表达;保护性抗原

中图分类号: S858.291.63 文献标识码: A 文章编号: 1000-4440(2021)03-0699-05

Recombinant protein expressed from BcfA in Bordetella bronchiseptica and its immune activity analysis

ZHU Wei-feng1,2,3, TAN Kai1,2,3, WANG Fang1,2,3, CHENG Xu1,2,3, QIU Ru-long1,2,3, FAN Zhi-yu1,2,3,CHEN Lu1,2,3

(1.Institute of Veterinary Medicine, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China;2.Key Laboratory of Veterinary Biological Engineering and Technology, Ministry of Agriculture and Rural affairs, Nanjing 210014, China;3.National Center for Engineering Research of Veterinary Bio-products, Nanjing 210014, China)

Abstract: To improve the expression and solubility of BcfA recombinant protein of a protective antigen against Bordetella bronchiseptica, the base sequence of BcfA gene encoding amino acid residues of the N-terminal after the 373rd position was cloned and expressed. The expression of shortened BcfA was increased by ten times, and the expression form was mainly soluble. Western blot results showed that the truncated protein encoded by BcfA still exhibited obvious reaction with convalescent serum infected by Bordetella bronchiseptica. The results of immunoprotection test showed that recombinant protein expressed from truncated BcfA still showed good immunoprotection against Bordetella bronchiseptica.

Key words: Bordetella bronchiseptica;Bordetella adhesion factor A (BcfA);truncated expression;protective antigen

支氣管败血波氏菌(Bordetella bronchiseptica)是一种能感染多种哺乳动物、引起动物发生鼻炎和肺炎的革兰氏阴性细小杆菌。此菌以犬、猪及兔的感染最为普遍,常导致犬传染性支气管炎、猪传染性萎缩性鼻炎和兔支气管败血波氏菌病。此外,支气管败血波氏菌和其他病原体之间存在协同作用,从而增加其他原发性和继发性病原体引起的呼吸道疾病的严重程度,对养殖业造成较大经济损失[1]。此外,人类也可以发生支气管败血波氏菌感染[2-3]。

目前已经研制或有报道的支气管败血波氏菌病疫苗主要包括灭活疫苗、弱毒疫苗和亚单位疫苗3种。与灭活疫苗和弱毒疫苗相比,亚单位疫苗具有安全、稳定和可以借助基因工程手段大量生产的优点,正成为兽用疫苗研究的重要方向[4-5]。支气管败血波氏菌的波氏菌黏附因子A(Bordetella colonization factor A, BcfA)蛋白是一种和细菌定殖有关的外膜蛋白,具有良好的免疫保护力,是支气管败血波氏菌亚单位疫苗研制的重要候选抗原[6-7]。……

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