Expression and functional analysis of porcine aminopeptidase N produced in prokaryotic expression system.

Expression and functional analysis of porcine aminopeptidase N produced in prokaryotic expression system.
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猪氨肽酶N在原核表达系统中的表达及功能分析

DOI:
10.1016/j.jbiotec.2009.02.005
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发表时间:
2009-04-20
影响因子:
4.1
通讯作者:
Ren X
Ren X
中科院分区:
工程技术3区
文献类型:
--
作者:
Liu B;Li G;Sui X;Yin J;Wang H;Ren X

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猪氨肽酶N (pAPN)是猪冠状病毒的一种细胞膜蛋白和功能性受体。本研究描述了不含信号肽的pAPN在BL21(DE3)pLysS宿主细胞中的异源表达。携带重组结构的大肠杆菌被高效诱导高水平表达pAPN蛋白。研究了pAPN的最佳表达谱。用纯化后的pAPN接种家兔,获得了高滴度的特异性抗体。在生物学上,该抗体与表达pAPN的大肠杆菌或猪睾丸细胞表面的天然pAPN反应。猪乳头状蛋白及其特异性抗体体外阻断传染性胃肠炎冠状病毒感染。利用免疫组织化学方法分析了猪小肠中pAPN的定位。
Porcine aminopeptidase N (pAPN) is a cellular membrane protein and a functional receptor for porcine coronaviruses. Here, we describe the heterologous expression of pAPN without signal peptide in BL21(DE3)pLysS host cells. The Escherichia coli (E. coli) harboring the recombinant construct was efficiently induced to express the pAPN protein at a high level. The most optimal expression profile for pAPN expression was investigated. By inoculating a rabbit with the purified pAPN, a high tittered specific antibody was achieved. Biologically, the antibody reacted with either pAPN-expressing E. coli or native pAPN on the surface of swine testis cells. The pAPN and its specific antibody blocked transmissible gastroenteritis coronavirus infection in vitro. Furthermore, the localization of pAPN on the small intestine of swine was analyzed by immunohistochemistry.
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