Zandvakili N, Zamani M, Motallebi M, Moghaddassi Jahromi Z. Cloning, Overexpression and
in vitro Antifungal Activity of
Zea Mays PR10 Protein.
Iran J Biotechnol 2017;
15:42-49. [PMID:
28959351 PMCID:
PMC5582252 DOI:
10.15171/ijb.1357]
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Abstract
Background
Plants have various defense mechanisms such as production of antimicrobial peptides, particularly
pathogenesis related proteins (PR proteins). PR10 family is an essential member of this group, with antifungal, antibacterial
and antiviral activities.
Objective
The goal of this study is to assess the antifungal activity of maize PR10 against some of fungal phytopathogens.
Materials and Methods
Zea mays PR10 gene (TN-05-147) was cloned from genomic DNA and cDNA and overexpressed
in Escherichia coli. The existence of a 77- bp intron and two exons in PR10 was confi rmed by comparing the genomic and
cDNA sequences. The PR10 cDNA was cloned in pET26b (+) expression vector and transformed into E. coli strain Rosetta
DE3 in order to express PR10 recombinant protein. Expression of the recombinant protein was checked by western analysis.
Recombinant PR10 appeared as insoluble inclusion bodies and thus solubilized and refolded. PR10 was isolated using Ni-
NTA column. The activity of the refolded protein was confi rmed by DNA degradation test. The antifungal activity of PR10
was assessed using radial diff usion, disc diff usion and spore germination. The hemolytic assay was performed to investigate
the biosafety of recombinant PR10.
Results
Recombinant maize PR10 exerted broad spectrum antifungal activity against
Botrytis cinerea, Sclerotinia
sclerotiorum, Fusarium oxysporum, Verticillium dahlia
and Alternaria solani. Hemolysis biosafety test indicated that the
protein is not poisonous to mammalian cells.
Conclusions
Maize PR10 has the potential to be used as the antifungal agent against diff erent fungal phytopathogens.
Therefore, this protein can be used in order to produce antifungal agents and fungi resistance transgenic plants.
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