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Expression of an optimized Argopecten purpuratus antimicrobial peptide in E. coli and evaluation of the purified recombinant protein by in vitro challenges against important plant fungi.

Abstract：

:Antimicrobial peptides (AMP) have been widely described in several organisms from different kingdoms. We recently designed and evaluated a synthetic version of an AMP isolated and characterized from Argopecten purpuratus hemocytes. This study describes the generation of a chimaeric gene encoding for Ap-S, the use of this construct to transform E. coli strain BL21, and the evaluation of the purified recombinant Ap-S (rApS) as an antifungal agent. The proposed gene coding for rAp-S consists of 93 nucleotides arranged downstream from the IPTG-inducible T7 promoter. The best synthesis conditions were obtained after E. coli cultivation at 26°C for 3h, which allowed for the production of an rAp-S-enriched fraction containing the peptide at 249μM. Mass spectrometry analysis of the purified rAp-S (3085.80Da) showed the addition of a glycine residue on its N-terminal end derived from vector design and peptide purification. The purified rApS fraction was assayed for antifungal activity by direct addition of purified rApS elution to potato dextrose agar media at a final concentration of 81nM. These assays showed important growth inhibitions of both biotrophic (Fusarium oxysporum, Trichoderma harzianum) and necrotrophic (Botrytis cinerea, Alternaria spp.) fungi in that the hyphae structures and spore count were affected in all cases. The strategy of cloning and expressing rAp-S in E. coli, the high yield obtained and its successful use for controlling pathogenic fungi suggest that this molecule could be applied to agricultural crops using various management strategies.

journal_name

Peptides

journal_title

Peptides

authors

Tapia E,Montes C,Rebufel P,Paradela A,Prieto H,Arenas G

doi

10.1016/j.peptides.2011.07.007

subject

Has Abstract

pub_date

2011-09-01 00:00:00

pages

1909-16

issue

9

eissn

0196-9781

issn

1873-5169

pii

S0196-9781(11)00282-8

journal_volume

32

pub_type

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