Prediction of the Th/B cell epitopes on HA of influenza virus(H1N1)and antigenicity analysis / 中国免疫学杂志

ABSTRACT

Objective:To predict Th/B cell epitopes in HA of influenza virus(H1N1)and analyze antigenicity of the candidate epitopes in order to develop epitope-bacterin by the way of bioinformatics.Methods:The HA amino acid sequences of infiuenza virus(H1N1),which the viral infection was prevalent recently,were downloaded from Genbank.The Th/B cell epitopes were predicted and analyzed by bioinformatics methods.Then,specificity and conservation of the candidate epitopes were estimated.Finally,antigenicity of the candidate epitopes was identified by influenza virus(H1N1)positiVe serum samples of mice.Results:Three Th/B cell epitopes containing HA_(73-87),HA_(125-139),HA_(188-205) were acquired Two of the candidate epitopes were in a relatively conserved domain of HA1,and a deal of 2006-2009 influenza virus(H1N1)isolates contained the sequences.Moreover,the candidate epitopes were showedin a distinct antibody combining reactivity with the influenza virus (H1N1)positive serum of mice,which inferred the predicted epitopes to be functional ones.Conclusion:The selected epitopes are able to be functional HA Th/B cell epitopes of influenza virus(H1N1).Our study also establish the foundations for the further research of influenza virus infectlon and immunity mechanism,the recognition of influenza virus(H1N1)functional epitope and the development of epitope vaccines.