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Generation and characterization of a monoclonal antibody against MERS-CoV targeting the spike protein using a synthetic peptide epitope-CpG-DNA-liposome complex

  • Park, Byoung Kwon (Center for Medical Science Research, College of Medicine, Hallym University) ;
  • Maharjan, Sony (Center for Medical Science Research, College of Medicine, Hallym University) ;
  • Lee, Su In (Center for Medical Science Research, College of Medicine, Hallym University) ;
  • Kim, Jinsoo (Department of Microbiology, College of Medicine, Hallym University) ;
  • Bae, Joon-Yong (Department of Microbiology, College of Medicine, and the Institute for Viral Diseases, Korea University) ;
  • Park, Man-Seong (Department of Microbiology, College of Medicine, and the Institute for Viral Diseases, Korea University) ;
  • Kwon, Hyung-Joo (Center for Medical Science Research, College of Medicine, Hallym University)
  • Received : 2018.08.08
  • Accepted : 2018.10.11
  • Published : 2019.06.30

Abstract

Middle East respiratory syndrome coronavirus (MERS-CoV) uses the spike (S) glycoprotein to recognize and enter target cells. In this study, we selected two epitope peptide sequences within the receptor binding domain (RBD) of the MERS-CoV S protein. We used a complex consisting of the epitope peptide of the MERS-CoV S protein and CpG-DNA encapsulated in liposome complex to immunize mice, and produced the monoclonal antibodies 506-2G10G5 and 492-1G10E4E2. The western blotting data showed that both monoclonal antibodies detected the S protein and immunoprecipitated the native form of the S protein. Indirect immunofluorescence and confocal analysis suggested strong reactivity of the antibodies towards the S protein of MERS-CoV virus infected Vero cells. Furthermore, the 506-2G10G5 monoclonal antibody significantly reduced plaque formation in MERS-CoV infected Vero cells compared to normal mouse IgG and 492-1G10E4E2. Thus, we successfully produced a monoclonal antibody directed against the RBD domain of the S protein which could be used in the development of diagnostics and therapeutic applications in the future.

Keywords

References

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