Identification of linear human B-cell epitopes of tick-borne encephalitis virus

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• 作者：Suvi Kuivanen (1)
  Jussi Hepojoki (1)
  Sirkka Vene (4)
  Antti Vaheri (1)
  Olli Vapalahti (1) (2) (3)
  
  1. Department of Virology ; Haartman Institute ; Faculty of Medicine ; University of Helsinki ; Helsinki ; Finland
  4. The Public Health Agency of Sweden ; Solna ; Sweden
  2. Department of Virology and Immunology ; Helsinki University Central Hospital Laboratory (HUSLAB) ; Helsinki ; Finland
  3. Department of Veterinary Biosciences ; Faculty of Veterinary Medicine ; University of Helsinki ; Helsinki ; Finland
  
• 关键词：Epitope ; Flavivirus ; Tick ; borne encephalitis virus
• 刊名：Virology Journal
• 出版年：2014
• 出版时间：December 2014
• 年：2014
• 卷：11
• 期：1
• 全文大小：1,624 KB
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• 刊物主题：Virology;
• 出版者：BioMed Central
• ISSN：1743-422X

文摘

Background Tick-borne encephalitis (TBE) is a central nervous system infection transmitted to humans by ticks. The causative agent, tick-borne encephalitis virus (TBEV), belongs to the genus Flavivirus (family Flaviviridae), which includes globally important arthropod-borne viruses, such as dengue, Yellow fever, Japanese encephalitis and West Nile viruses. Flaviviruses are highly cross-reactive in serological tests that are currently based on viral envelope proteins. The envelope (E) protein is the major antigenic determinant and it is known to induce neutralizing antibody responses. Methods We synthesized the full-length TBEV proteome as overlapping synthetic 18-mer peptides to find dominant linear IgG epitopes. To distinguish natural TBEV infections from responses to TBE immunization or other flavivirus infections, the peptides were probed with sera of patients infected with TBEV, West Nile virus (WNV) or dengue virus (DENV), sera from TBE vaccinees and negative control sera by SPOT array technique. Results We identified novel linear TBEV IgG epitopes in the E protein and in the nonstructural protein 5 (NS5). Conclusions In this study, we screened TBEV structural and nonstructural proteins to find linear epitopes specific for TBEV. We found 11 such epitopes and characterized specifically two of them to be potential for differential diagnostics. This is the first report of identifying dominant linear human B-cell epitopes of the whole TBEV genome. The identified peptide epitopes have potential as antigens for diagnosing TBEV and to serologically distinguish flavivirus infections from each other.