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Research Paper

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    Research paper appeared in the Iranian Journal of Biotechnology last month, authored in part by Omid Ansari, who is head of research at Ecofibre.


    Background: Defensin peptide isolated from plants are often heterogeneous in length, sequence and structure, but they are mostly small, cationic and amphipathic. Plant defensins exhibit broad-spectrum antibacterial and antifungal activities against Gram-positive and Gram-negative bacteria, fungi and etc. Plant defensins also play an important role in innate immunity, such as heavy metal and some abiotic stresses tolerance.Objectives: In this paper, in vitro broad-spectrum activities, antimicrobial and heavy metal absorption, of a recombinant plant defensin were studied.

    Materials and Methods: SDmod gene , a modified plant defensin gene , was cloned in pBISN1-IN (EU886197) plasmid, recombinant protein was produced by transient expression via Agroinfiltration method in common bean. The recombinant protein was tested for antibacterial activity against Gram-negative, Gram-positive bacteria and Fusarium spp. the effects of different treatments on heavy metal zinc absorption by this peptide were tested.

    Results: We confirmed the antibacterial activities of this peptide against Gram-negative (Escherichia coli and Pseudomonas aeruginosa) and Gram-positive (Staphylococcus aureus and Bacillus cereus) bacteria, and antifungal activities of this peptide against Fusarium spp. (Fusarium oxysporum and Fusarium solani). High metal absorption coefficient for this peptide was also observed.

    Conclusions: Results suggesting that modified defensin peptide facilitates a broader range of defense activities. dedefensins are an important part of the innate immune system in eukaryotes. These molecules have multidimensional properties that making them promising agents for therapeutic drugs.
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