Expression, Polyubiquitination, and Therapeutic Potential of Recombinant E6E7 from HPV16 Antigens Fused to Ubiquitin

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• 作者：Liliane M. Fernandes de Oliveira ; Mirian G. Morale…
• 关键词：HPV ; Polyubiquitination ; Recombinant antigen ; Ubiquitin fusion ; Vaccine
• 刊名：Molecular Biotechnology
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：59
• 期：1
• 页码：46-56
• 全文大小：
• 刊物主题：Biotechnology; Biochemistry, general; Cell Biology; Protein Science; Biological Techniques; Human Genetics;
• 出版者：Springer US
• ISSN：1559-0305
• 卷排序：59

文摘

Ubiquitin–proteasome system plays an essential role in the immune response due to its involvement in the antigen generation and presentation to CD8+ T cells. Hereby, ubiquitin fused to antigens has been explored as an immunotherapeutic strategy that requires the activation of cytotoxic T lymphocytes. Here we propose to apply this ubiquitin fusion approach to a recombinant vaccine against human papillomavirus 16-infected cells. E6E7 multi-epitope antigen was fused genetically at its N- or C-terminal end to ubiquitin and expressed in Escherichia coli as inclusion bodies. The antigens were solubilized using urea and purified by nickel affinity chromatography in denatured condition. Fusion of ubiquitin to E6E7 resulted in marked polyubiquitination in vitro mainly when fused to the E6E7 N-terminal. When tested in a therapeutic scenario, the fusion of ubiquitin to E6E7 reinforced the anti-tumor protection and increased the E6/E7-specific cellular immune responses. Present results encourage the investigation of the adjuvant potential of the ubiquitin fusion to recombinant vaccines requiring CD8+ T cells.