Polymerization and evaluation of the protective efficacy of rotavirus VP4* proteins.

Yijian LI; Guoxing Luo; Han Yang; Lianzhi Jia; Yuanjun Zeng; Biyan Zhao; Tingdong LI; Shengxiang GE

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Polymerization and evaluation of the protective efficacy of rotavirus VP4* proteins.

Author: Yijian LI ¹ ; Guoxing LUO ¹ ; Han YANG ² ; Lianzhi JIA ² ; Yuanjun ZENG ² ; Biyan ZHAO ² ; Tingdong LI ² ; Shengxiang GE ²
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1. State Key of Molecular Vaccinology and Molecular Diagnostics, National Institute of Diagnostics and Vaccine Development in Infection Disease, School of Life Sciences, Xiamen University, Xiamen 361102, Fujian, China.
2. State Key of Molecular Vaccinology and Molecular Diagnostics, National Institute of Diagnostics and Vaccine Development in Infection Disease, School of Public Health, Xiamen University, Xiamen 361102, Fujian, China.
Publication Type:Journal Article
Keywords: VP4 polymer; genetic engineering vaccine; immunoprotective; neutralizing antibody; rotavirus
MeSH: Animals; Antibodies, Viral; Antigens, Viral; Capsid; Capsid Proteins; Mice; Polymerization; Rotavirus; Rotavirus Infections
From: Chinese Journal of Biotechnology 2019;35(2):281-289
CountryChina
Language:Chinese
Abstract: In previous studies, we found that truncated rotavirus VP4* (aa 26-476) could be expressed in soluble form in Escherichia coli and confer high protection against rotavirus in the mouse mode. In this study, we further improved the immunogenicity of VP4* by polymerization. The purified VP4* was polymerized through incubation at 37 ℃ for 24 h, and then the homogeneity of the particles was analyzed by HPLC, TEM and AUC, while the thermal stability and antigenicity was analyzed by DSC and ELISA, respectively. Finally, the immunogenicity and protective efficacy of the polymers analyzed by a mouse maternal antibody model. The results showed that VP4* aggregated into homogeneous polymers, with high thermostability and neutralizing antibody binding activity. In addition, VP4* polymers (endotoxin <20 EU/dose) stimulated higher neutralizing antibodies and confer higher protection against rotavirus-induced diarrhoea compared with the VP4* trimers when immunized with aluminium adjuvant. In summary, the study in VP4* polymers provides a new strategy for the development of recombinant rotavirus vaccines.