title: Isolation and sequence determination of peptides in the venom of the spider wasp (Cyphononyx dorsalis) guided by matrix-assisted laser desorption/ionization time of flight (MALDI-TOF) mass spectrometry.
abstract: Micro-scale (sub-pmol) isolation and sequence determination of three peptides from the venom of the solitary spider wasp Cyphononyx dorsalis is described. We isolated two novel peptides Cd-125 and Cd-146 and a known peptide Thr(6)-bradykinin from only two venom sacs of solitary spider wasp Cyphononyx dorsalis without bioassay-guided fractionation, but instead guided by MALDI-TOF MS. The MALDI-TOF MS analysis of each fraction showed the purity and molecular weight of the components, which led to the isolation of the peptides virtually without loss of sample amount. The sequences of the novel peptides Cd-125 (Asp-Thr-Ala-Arg-Leu-Lys-Trp-His) and Cd-146 (Ser-Glu-Thr-Gly-Asn-Thr-Val-Thr-Val-Lys-Gly-Phe-Ser-Pro-Leu-Arg) were determined by Edman degradation together with mass spectrometry, and finally corroborated by solid-phase synthesis. The known peptide Thr(6)-bradykinin (Arg-Pro-Pro-Gly-Phe-Thr-Pro-Phe-Arg) was identified by comparison with the synthetic authentic specimen. This is the first example for any kinins to be found in Pompilidae wasp venoms. The procedure reported here can be applicable to studies on many other components of solitary wasp venoms with limited sample availability.
authors: Center of Study of Social Insects, Institute of Biosciences of Rio Claro, São Paulo State University, SP 13506-900, Rio Claro, Brazil. kk-gon@rc.unesp.br
authors: K
authors: K
authors: Konno
authors: M
authors: M
authors: Hisada
authors: H
authors: H
authors: Naoki
authors: Y
authors: Y
authors: Itagaki
authors: T
authors: T
authors: Yasuhara
authors: M A
authors: MA
authors: Juliano
authors: L
authors: L
authors: Juliano
authors: M S
authors: MS
authors: Palma
authors: T
authors: T
authors: Yamane
authors: T
authors: T
authors: Nakajima
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D005260:Female; D013058:Mass Spectrometry; D008969:Molecular Sequence Data; D014862:Wasp Venoms / Q000737:chemistry* / Q000302:isolation & purification
chemical_list: D014862:Wasp Venoms