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Background: A promising strategy in cancer therapy involves the production of fusion proteins, which entail the fusion of two distinct proteins. This study aimed to produce and assess the cytotoxic effects of the Nisin-arginine deiminase (ADI) fusion protein on the SW480 cell lines, a common model for studying colorectal cancer (CRC).
Materials & Methods: The designed Nisin-ADI gene fragment sequence was sent to Biomatik Company for synthesis in pET-28a vectors between SacI and HindIII restriction enzyme sites. Escherichia coli (E. coli) DH5α and BL21 were utilized for cloning and protein expression, respectively. The recombinant fusion protein expression was induced by Isopropyl ß-D-1-thiogalactopyranoside (IPTG) and purified using Ni2+-nitrilotriacetic acid (1) resin affinity chromatography. Sodium dodecyl-sulfate polyacrylamide gel electrophoresis (SDS-PAGE) and Western blotting were conducted to analyze the purified protein. The cytotoxic effect of the purified recombinant fusion protein on SW480 and NIH3T3 cells, as a control, was evaluated using 3-[4,5-dimethylthiazol-2-yl]-2,5 diphenyl tetrazolium bromide (MTT) assay.
Findings: The results of this study showed that the fusion protein had a significant impact on the SW480 cell lines. The Half-maximal inhibitory concentration (IC50) of the fusion protein was 30 µg/mL, indicating that it effectively inhibited the growth of cancer cells. However, the fusion protein did not significantly affect the control group.
Conclusion: This study provides helpful insights into the potential application of recombinant Nisin-ADI fusion proteins as a potential treatment option for colorectal cancer. The potential for selective targeting of cancer cells is promising as normal cells are unaffected by this fusion protein.

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Developing a technique for efficient and safe gene delivery to plant cells is a fundamental aim of plant biotechnology. Agrobacterium mediated transformation as the most common and practical method in plant gene delivery has considerable difficulties such as limitation in applicable for plant species. In recent years several new methods have been suggested, although none of them could be a good replacement. The use of nanotechnology has been provided new solutions to overcome the limitations of biotechnology. Designing biocompatible nanostructures for passing cell barriers and targeted delivery of cargo has improved the biological achievements. In this research the capability of arginine functionalized single-walled carbon nanotube (Arg-SWNT) as a new carrier to transfer plasmid DNA, which codes green fluorescent protein (GFP) to tobacco suspension cells, has been investigation. It is suggested that single-walled carbon nanotubes can pass through cell wall pores and plasma membrane while it carries plasmid DNA along with. The fluorescence microscopy images illustrate the success of gene delivery by Arg-SWNT