Engineering His-Tagged Senecavirus A for One-Step Purification of Viral Antigens

Overview

Journal Vaccines (Basel)

Date 2022 Feb 26

PMID 35214628

Authors

Junhao Fan

Peiyu Xiao

Dongni Kong

Xinran Liu

Liang Meng

Tongqing An

Xuehui Cai

Haiwei Wang

Li Yu

Affiliations

Soon will be listed here.

Abstract

Senecavirus A (SVA) is a picornavirus that causes vesicular disease in swine, and the inactivated vaccine is used to prevent and control SVA infection. To develop a new chromatography strategy for the purification and concentration of SVA vaccine antigens, we inserted a 6×His-tag at the VP1 C-terminal of the SVA/HLJ/CHA/2016 in an infectious clone to rescue a His-tagged SVA. The constructed and rescued recombinant virus, named as rSVA-His, exhibited similar growth kinetics to that of its parental virus. In addition, the expression of a 6×His-tag on the surface of SVA showed genetic stability in cell passages in vitro, which allowed one-step purification of SVA antigens by Ni affinity columns. Furthermore, the immunogenicity of the inactivated rSVA-His was evaluated by inoculating rabbits and detecting neutralizing antibodies. The animals receiving two doses of the inactivated rSVA-His emulsified with oil adjuvant developed a high titer of neutralizing antibodies, indicating that SVA VP1 is tolerant to His-tag insertion without detriment to its antigenicity. In summary, the constructed 6×His-tagged SVA may offer a feasible approach to the affinity purification and concentration of antigens in the process of SVA inactivated vaccine production.

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