辣椒脉黄病毒P4蛋白多克隆抗体制备与应用

卜姗; 罗香文; 张德咏; 张松柏; 张宇; 刘勇

doi:10.19303/j.issn.1008-0384.2022.01.010

辣椒脉黄病毒P4蛋白多克隆抗体制备与应用

Preparation and Application of Polyclonal Antibody against Vein Yellows Virus P4 on Chili Pepper Plants

摘要

摘要:
目的辣椒脉黄病毒（Pepper vein yellows virus， PeVYV）属马铃薯卷叶病毒属（Polerovirus），生产上主要侵染辣椒，目前在我国呈现快速扩展态势，因此，亟需开展PeVYV致病性研究，为分析对辣椒的潜在威胁提供依据。以PeVYV编码运动蛋白P4为免疫源，制备多克隆抗体，建立PeVYV P4蛋白特异性检测方法，为PeVYV P4蛋白功能研究奠定基础。
方法采用RT-PCR技术，从感染PeVYV辣椒cDNA中扩增获得片段大小为471 bp的PeVYV P4基因，并克隆到原核表达载体pDEST17，转化E. coli Rosetta中进行诱导表达，采用Ni-NTA柱层析纯化。以纯化P4蛋白作为抗原免疫新西兰白兔制备多克隆抗体。制备的多克隆抗体采用Western blotting检测。
结果原核表达的PeVYV P4蛋白，SDS-PAGE表明纯化蛋白为一分子量约为25 kDa的单一条带。Western blotting检测表明，制备的多克隆抗体，特异性的结合P4蛋白。PeVYV侵染辣椒样本检测表明，制备的P4多克隆抗体能特异性检测PeVYV。
结论制备的PeVYV P4多克隆抗体，可用于特异性检测PeVYV P4蛋白，为进一步深入研究P4蛋白的功能奠定基础。

Abstract:
Objective Pathogenicity of the pepper vein yellows virus (PeVYV) of genus Polerovirus that caused epidemic infection on chili peppers, Capsicum annuum L., in China was studied to assess the potential threat to the crop, and the polyclonal antibody against the virus prepared.
Methods Polyclonal antibody of PeVYV was prepared using the purified recombinant P4 protein. A detection method based on the antibody was established to determine the functions and characteristics of P4. The 471 bp of P4 gene was amplified by RT-PCR using the total RNA of infected chili peppers and cloned into prokaryotic expressing plasmid pDEST17 expressed in E. coli Rosetta by arabinose induction. The recombinant P4 was purified by Ni-NTA chromatography for the antibody preparation and verified by western blotting.
Results The recombinant P4 protein was soluble with a molecular weight of approximately 25 kDa. The prepared polyclonal antibody was confirmed by western blot to specifically recognize the protein.
Conclusions The polyclonal antibody prepared in this study specifically recognized P4. It could be used to characterize and determine the functions of the protein.

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