title: Isolation, characterization and biological properties of two kinin-like peptides (peptide-S and peptide-r) from Scaptocosa raptoria venom.
abstract: Two peptides with kinin-like biological properties were isolated by chromatography on a Sephadex G-10 column followed by high-performance liquid chromatography, from the venom of the spider Scaptocosa raptoria. The isolated peptides (peptide-S and peptide-R) were shown to cause contraction on the isolated guinea-pig ileum at amounts equivalent to those shown by bradykinin. Both peptides relaxed the isolated rat duodenum, increased the capillary permeability, caused decreasing and biphasic effect of the arterial blood pressure in conscious rats and induced oedema in the rat paw. The peptides had activity and structural similarities to other peptides (kinin-like) isolated from venoms. The complete amino acid analysis gave peptide-S a structure with 36 amino acid residues and peptide-R 22 amino acid residues. The mol. wts were estimated to be in the range of 4000 and 2870, respectively.
authors.affiliation: Laboratório de Bioquimica e Biofisica, Instituto Butanta, São Paulo, Brazil.
authors.forename: L A
authors.initials: LA
authors.lastname: Ferreira
authors.forename: S M
authors.initials: SM
authors.lastname: Lucas
authors.forename: E W
authors.initials: EW
authors.lastname: Alves
authors.forename: V V
authors.initials: VV
authors.lastname: Hermann
authors.forename: A P
authors.initials: AP
authors.lastname: Reichl
authors.forename: G
authors.initials: G
authors.lastname: Habermehl
authors.forename: R B
authors.initials: RB
authors.lastname: Zingali
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D002199:Capillary Permeability / Q000187:drug effects; D005260:Female; D006168:Guinea Pigs; D008297:Male; D008969:Molecular Sequence Data; D009119:Muscle Contraction / Q000187:drug effects; D009130:Muscle, Smooth / Q000187:drug effects*; D051381:Rats; D017207:Rats, Sprague-Dawley; D013111:Spider Venoms / Q000302:isolation & purification* / Q000494:pharmacology; D013329:Structure-Activity Relationship
chemical_list: D013111:Spider Venoms; C113534:peptide-R, Scaptocosa; C113535:peptide-S, Scaptocosa