Identification of three antigen epitopes on the nucleocapsid protein of the genotype C of bovine parainfluenza virus type 3

文献类型： 外文期刊

第一作者： Ren, Jian-Le

作者： Ren, Jian-Le;Zhu, Yuan-Mao;Zhou, Yue-Hui;Lv, Chuang;Yan, Hao;Ma, Lei;Shi, Hong-Fei;Xue, Fei

作者机构：

关键词： Bovine parainfluenza virus type 3;Nucleocapsid protein;Epitope;Monoclonal antibodies;Genotype C

期刊名称：VETERINARY MICROBIOLOGY （ 影响因子：3.293； 五年影响因子：3.599 ）

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收录情况： SCI

摘要： Bovine parainfluenza virus type 3 (BPIV3) is an important respiratory tract pathogen for both young and adult cattle. So far, three genotypes A, B and C of BPIV3 have been described on the basis of genetic and phylogenetic analysis. But fine mapping of epitopes of BPIV3 is scant and the antigenic variations among the three genotypes of BPIV3 have not been reported. Nucleocapsid protein (NP) is the most abundant protein in the virion and highly conserved in BPIV3, which is crucial for the induction of protective immunity in host. To identify antigenic determinants of BPIV3 NP, a panel of monoclonal antibodies (mAbs) was tested against a series of overlapping recombinant NP fragments expressed in Escherichia coli. Firstly, six monoclonal antibodies (mAbs) against NP of the genotype C of BPIV3 (BPIV3c) were generated by using the purified BPIV3c strain SD0835 as immunogen and the recombinant NP of SD0835 as screening antigen. Then three antigen epitopes were identified with the six mAbs. One epitope (91)GNNADVKYVIYM(102) was recognized by mAb 5E5. The mAbs 7G5, 7G8, 7G9, and 7H5 were reactive with another epitope (407)FYKPTGG(413). The third epitope (428)ESRGDQDQ(435) was reactive with mAb 6F8. Further analysis showed that the epitope (91-102 amino acids [aa]) was the most conserved and reactive with mAb 5E5 for all three genotypes of BPIV3 and HPIV3. The epitope (407-413 aa) was relatively conserved and reactive with mAbs 7G5, 7G8, 7G9, and 7H5 for BPIV3a, BPIV3c and HPIV3, but not reactive with BPIV3b. The epitope (428-435 aa) was less conserved and was reactive only with mAb 6F8 for BPIV3a and BPIV3c. These results suggested that there were evident antigenic variations among the three genotypes of BPIV3 and HPIV3. The mAb 6F8 could be used to detect BPIV3a and BPIV3c. The mAbs 7G5, 7G8, 7G9, and 7H5 might be used for differentiate BPIV3a, BPIV3c and HPIV3 from BPIV3b. The mAb 5E5 might be used for detecting all three types of BPIV3 and HPIV3. The results in this study would have potential applications in the development of suitable diagnostic techniques for BPIV3, which was prevalent in China. (C) 2015 Elsevier B.V. All rights reserved.

分类号： S8

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