期刊
TOXINS
卷 14, 期 11, 页码 -出版社
MDPI
DOI: 10.3390/toxins14110754
关键词
entomopathogenic nematodes; excretory; secretory products; disulfide-rich peptide; ShK; insecticidal toxins; fruit fly; toxicity assay; locomotor activity
资金
- FCT [SFRH/BD/131698/2017]
- Fundo Europeu de Desenvolvimento Regional (FEDER) under project NanoNema [ACORES-01-0145-FEDER000113]
- FCT-Fundacao para a Ciencia e a Tecnologia, Portuguese Institute (P.I), through iNOVA4Health [UIDB/04462/2020, UIDP/04462/2020]
- FCT-Fundacao para a Ciencia e a Tecnologia, Portuguese Institute (P.I), through LS4FUTURE Associated Laboratory [LA/P/0087/2020]
- NORCE Norwegian Research Centre
- Research Council of Norway [221568]
This study successfully expressed a potentially insecticidal ShK-like peptide, which exhibited toxic effects on insects and significantly reduced their locomotor activity in a Drosophila model after oral administration.
Entomopathogenic nematodes are used as biological control agents against a broad range of insect pests. We ascribed the pathogenicity of these organisms to the excretory/secretory products (ESP) released by the infective nematode. Our group characterized different virulence factors produced by Steinernema carpocapsae that underlie its success as an insect pathogen. A novel ShK-like peptide (ScK1) from this nematode that presents high sequence similarity with the ShK peptide from a sea anemone was successfully produced recombinantly in Escherichia coli. The secondary structure of ScK1 appeared redox-sensitive, exhibiting a far-UV circular dichroism spectrum consistent with an alpha-helical secondary structure. Thermal denaturation of the ScK1 allowed estimating the melting temperature to 59.2 +/- 0.1 degrees C. The results from toxicity assays using Drosophila melanogaster as a model show that injection of this peptide can kill insects in a dose-dependent manner with an LD50 of 16.9 mu M per adult within 24 h. Oral administration of the fusion protein significantly reduced the locomotor activity of insects after 48 h (p < 0.05, Tukey's test). These data show that this nematode expresses insecticidal peptides with potential as next-generation insecticides.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据