We had earlier obtained a murine monoclonal antibody (mAb), termed 5G10, that bound to Salmonella flagellin (SF) and subsequently impaired the latter property of Toll-like receptor 5 (TLR5) signaling activation. Besides interrupting SF-mediated TLR5 activation, mAb 5G10 probably had other potential applications. In this study, we explored multiple functions of 5G10. A short peptide QRVRELAV (designated T5) derived from SF in either terminal of proteins was specifically recognized by 5G10. T5 tag expressed in eukaryotic cell was also detected by 5G10 when analyzed by Western blot, immunofluorescence assay (IFA), and fluorescent-activated cell sorting (FACS). The result of the co-immunoprecipitation assay showed that 5G10 as a bait antibody dragged out the complex of enterovirus 71 (EV71) 2A and mitochondrial antiviral signaling (MAVS) protein. More importantly, 5G10 helped to purify fusion proteins T5-tagged (EV71) 2A and T5-Japanese encephalitis virus NS5 methyltransferase (MTase). Thus, it has been suggested that mAb 5G10 could be useful in several biological applications, including protein identification, location, and affinity purification.
Keywords: flagellin; monoclonal antibody; protein purification.