ArticleParasites & vectors2015
Purification and characterization of a novel defensin from the salivary glands of the black fly, Simulium bannaense.
Article in Parasites & vectors, 2015. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 10 papers.
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Who cites it
10 citing papers in PubMed, 23 citations in OpenAlex.
- Bannakunin: a dual-target Kunitz inhibitor bridging anticoagulation (FXa/XIIa) and anti-platelet (α2β1/P2Y12) pathways.Cellular & molecular biology letters · 2026Article
- Exploring the potential role of defensins in differential vector competence of body and head lice for Bartonella quintana.Parasites & vectors · 2023Article
- Article
- Identification and Functional Analysis of a Defensin CcDef2 fromInternational journal of molecular sciences · 2022Article
- Article
- Structure-Activity Relationships of Insect Defensins.Frontiers in chemistry · 2017Review
- Screening, Expression, Purification and Functional Characterization of Novel Antimicrobial Peptide Genes from Hermetia illucens (L.).PloS one · 2017Article
- Article
- A potent anti-inflammatory peptide from the salivary glands of horsefly.Parasites & vectors · 2015Article
- A cecropin-like antimicrobial peptide with anti-inflammatory activity from the black fly salivary glands.Parasites & vectors · 2015Article
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Authors and funding
12 authors at 3 institutions in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
backgroundBlack flies (Diptera: Simuliidae) are haematophagous insects that can cause allergic reactions and act as vectors of pathogens. Although their saliva has been thought to contain a diverse array of physiologically active molecules, little information is available on antimicrobial factors in black fly salivary glands, especially no defensins have been reported so far.
methodsA novel cationic defensin designated SibaDef was purified using reverse phase high-performance liquid chromatography (RP-HPLC) from the salivary glands of the black fly Simulium bannaense. The amino acid sequence of SibaDef was determined by a combination method of automated Edman degradation and cDNA sequencing. The morphologic changes of Gram-positive bacteria Staphylococcus aureus or Bacillus subtilis treated with SibaDef were assessed by scanning electron microscopy (SEM). Quantitative PCR (qPCR) was performed to analyze the expression of SibaDef mRNA in whole bodies of insects after oral infection with the bacteria S. aureus or B. subtilis.
resultsSurprisingly, the phylogenetic analysis of defensin-related amino acid sequences demonstrated that SibaDef is most closely related to defensins from the human body louse Pediculus humanus corporis (Anoplura: Pediculidae), rather than to other dipteran defensins. SibaDef showed potent antimicrobial activities against Gram-positive bacteria with minimal inhibitory concentrations (MICs) ranging from 0.83 μM to 2.29 μM. SEM analysis indicated that SibaDef killed microorganisms through the disruption of cell membrane integrity. The transcript levels of SibaDef in the bacteria-immunized flies increased with the time course, reaching maximum at 36 h and then slowly decreased from that time point.
conclusionsOur results indicate that SibaDef is involved in the innate humoral response of the black fly S. bannaense, and it might play a significant role in the defence against microorganisms in both sugar and blood meals.
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