Abstract:
:The antifungal activity of cecropin A(2-8)-melittin(6-9) hybrid undecapeptides, previously reported as active against plant pathogenic bacteria, was studied. A set of 15 sequences was screened in vitro against Fusarium oxysporum, Penicillium expansum, Aspergillus niger, and Rhizopus stolonifer. Most compounds were highly active against F. oxysporum (MIC < 2.5 microM) but were less active against the other fungi. The best peptides were studied for their sporicidal activity and for Sytox green uptake in F. oxysporum microconidia. A significant inverse linear relationship was observed between survival and fluorescence, indicating membrane disruption. Next, we evaluated the in vitro activity against P. expansum of a 125-member peptide library with the general structure R-X(1)KLFKKILKX(10)L-NH(2), where X(1) and X(10) corresponded to amino acids with various degrees of hydrophobicity and hydrophilicity and R included different N-terminal derivatizations. Fifteen sequences with MICs below 12.5 muM were identified. The most active compounds were BP21 {Ac,F,V} and BP34 {Ac,L,V} (MIC < 6.25 microM), where the braces denote R, X(1), and X(10) positions and where Ac is an acetyl group. The peptides had sporicidal activity against P. expansum conidia. Seven of these peptides were tested in vivo by evaluating their preventative effect of inhibition of P. expansum infection in apple fruits. The peptide Ts-FKLFKKILKVL-NH(2) (BP22), where Ts is a tosyl group, was the most active with an average efficacy of 56% disease reduction, which was slightly lower than that of a commercial formulation of the fungicide imazalil.
journal_name
Appl Environ Microbioljournal_title
Applied and environmental microbiologyauthors
Badosa E,Ferré R,Francés J,Bardají E,Feliu L,Planas M,Montesinos Edoi
10.1128/AEM.00711-09subject
Has Abstractpub_date
2009-09-01 00:00:00pages
5563-9issue
17eissn
0099-2240issn
1098-5336pii
AEM.00711-09journal_volume
75pub_type
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journal_title:Applied and environmental microbiology
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journal_title:Applied and environmental microbiology
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doi:10.1128/AEM.62.4.1378-1382.1996
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