Interferons (IFNs) are universally acknowledged for their pivotal role in antiviral and anticancer responses. Thus, the primary aim of our study was to explore the expressions of IFN-α1b, α2b, and gamma in tobacco leaves via agrobacterium-mediated transient transformation and investigate their possible activities. Briefly, fusion with green fluorescent protein tags aided in detecting the expressed IFN proteins in the foliar tissues. The genetic constructs encoding these fusion proteins were inserted into the MagnICON plant transient expression vector, followed by transformation into the Agrobacterium strain GV3101. The transformed bacteria were then used to infiltrate tobacco leaves. After post-infiltration, protein expression was confirmed within 72 h via sodium dodecyl sulfate polyacrylamide gel electrophoresis, and the fusion proteins were subsequently purified using high-performance liquid chromatography for identification. Both the antiviral and anticancer potencies of these IFN fusion proteins were evaluated using the WISH/VSV (WISH cells/Vesicular stomatitis virus) microneutralization and MTT (3-(4,5-Dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide) assays, respectively. Results indicated robust expression of the targeted IFN genes in plant tissues and significant biological activities against pathogens and cancer cells. Consequently, this study substantiated the viability of producing these therapeutic proteins in plants, potentially revolutionizing the manufacture of interferons biologically.
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