Although
antiviral drugs and
vaccines have been successful for mitigating influenza virus
infections, the lack of general technical platform for the timely supply of soluble and highly purified
influenza viral antigens presents a serious bottleneck for the subsequent analysis for the effective control of the
viral disease. Using the Escherichia coli (E. coli)
lysyl tRNA synthetase (LysRS) as a novel fusion partner, this study reports the soluble expression of
influenza viral proteins in E. coli host, construction of antibody library against the virus, and detection of anti-
influenza antibodies using the expressed
viral antigens. When
influenza A and B
viral proteins were fused with the LysRS, the fusion
proteins were expressed predominantly as soluble forms and their production yields were high enough to be amenable to immunization protocols in rabbits for antibody generation. The produced
antibodies showed high level binding specificity against the respective
viral proteins, with cross-reactivity across heterologous viruses within the same type of influenza viruses. In addition, LysRS-HA fusion
protein could bind specifically to anti-HA
antibodies in the virus-infected mouse serum in widely accepted two detection methods, Western blot and ELISA. These results present a convenient tool for the production of
antibodies specific to the virus as well as the rapid detection of
influenza viral infections, ultimately contributing to the control of influenza viruses including highly pathogenic H5N1, pandemic H1N1, or the recent H7N9 influenza viruses.