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Insecticidal activity of a recombinant knottin peptide from Loxosceles intermedia venom and recognition of these peptides as a conserved family in the genus.
Matsubara, F H; Meissner, G O; Herzig, V; Justa, H C; Dias, B C L; Trevisan-Silva, D; Gremski, L H; Gremski, W; Senff-Ribeiro, A; Chaim, O M; King, G F; Veiga, S S.
Afiliación
  • Matsubara FH; Department of Cell Biology, Federal University of Parana, Jardim das Américas, Curitiba, Paraná, Brazil.
  • Meissner GO; Department of Cell Biology, Federal University of Parana, Jardim das Américas, Curitiba, Paraná, Brazil.
  • Herzig V; Institute for Molecular Bioscience, The University of Queensland, St. Lucia, QLD, Australia.
  • Justa HC; Institute for Molecular Bioscience, The University of Queensland, St. Lucia, QLD, Australia.
  • Dias BC; Department of Cell Biology, Federal University of Parana, Jardim das Américas, Curitiba, Paraná, Brazil.
  • Trevisan-Silva D; Department of Cell Biology, Federal University of Parana, Jardim das Américas, Curitiba, Paraná, Brazil.
  • Gremski LH; Department of Cell Biology, Federal University of Parana, Jardim das Américas, Curitiba, Paraná, Brazil.
  • Gremski W; Department of Cell Biology, Federal University of Parana, Jardim das Américas, Curitiba, Paraná, Brazil.
  • Senff-Ribeiro A; Health and Biological Science Institute, Catholic University of Parana, Prado Velho, Curitiba, Paraná, Brazil.
  • Chaim OM; Department of Cell Biology, Federal University of Parana, Jardim das Américas, Curitiba, Paraná, Brazil.
  • King GF; Department of Cell Biology, Federal University of Parana, Jardim das Américas, Curitiba, Paraná, Brazil.
  • Veiga SS; Institute for Molecular Bioscience, The University of Queensland, St. Lucia, QLD, Australia.
Insect Mol Biol ; 26(1): 25-34, 2017 02.
Article en En | MEDLINE | ID: mdl-27743460
Loxosceles intermedia venom comprises a complex mixture of proteins, glycoproteins and low molecular mass peptides that act synergistically to immobilize envenomed prey. Analysis of a venom-gland transcriptome from L. intermedia revealed that knottins, also known as inhibitor cystine knot peptides, are the most abundant class of toxins expressed in this species. Knottin peptides contain a particular arrangement of intramolecular disulphide bonds, and these peptides typically act upon ion channels or receptors in the insect nervous system, triggering paralysis or other lethal effects. Herein, we focused on a knottin peptide with 53 amino acid residues from L. intermedia venom. The recombinant peptide, named U2 -sicaritoxin-Li1b (Li1b), was obtained by expression in the periplasm of Escherichia coli. The recombinant peptide induced irreversible flaccid paralysis in sheep blowflies. We screened for knottin-encoding sequences in total RNA extracts from two other Loxosceles species, Loxosceles gaucho and Loxosceles laeta, which revealed that knottin peptides constitute a conserved family of toxins in the Loxosceles genus. The insecticidal activity of U2 -SCTX-Li1b, together with the large number of knottin peptides encoded in Loxosceles venom glands, suggests that studies of these venoms might facilitate future biotechnological applications of these toxins.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Venenos de Araña / Hidrolasas Diéster Fosfóricas / Miniproteínas Nodales de Cistina / Araña Reclusa Parda / Insecticidas Tipo de estudio: Evaluation_studies Límite: Animals Idioma: En Revista: Insect Mol Biol Asunto de la revista: BIOLOGIA MOLECULAR Año: 2017 Tipo del documento: Article País de afiliación: Brasil Pais de publicación: Reino Unido
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Venenos de Araña / Hidrolasas Diéster Fosfóricas / Miniproteínas Nodales de Cistina / Araña Reclusa Parda / Insecticidas Tipo de estudio: Evaluation_studies Límite: Animals Idioma: En Revista: Insect Mol Biol Asunto de la revista: BIOLOGIA MOLECULAR Año: 2017 Tipo del documento: Article País de afiliación: Brasil Pais de publicación: Reino Unido