Blomhotin: a novel peptide with smooth muscle contractile activity identified in the venom of Agkistrodon halys blomhoffii.
A novel peptide has been isolated from the venom of Agkistrodon halys blomhoffii using a bioassay that monitors the stimulant effect on rat stomach fundus. The 11-amino acid peptide, named blomhotin, was purified to homogeneity by gel-filtration column chromatography and reverse-phase HPLC. The amino acid sequence of blomhotin was determined to be pGlu-Gly-Arg-Pro-Pro-Gly-Pro-Pro-Ile-Pro-Arg, which is similar to that of bradykinin-potentiating peptides which themselves cause no contraction of smooth muscle. The contraction induced by blomhotin showed homologous desensitization, implicating the involvement of a blomhotin-specific site in the response.
Yanoshita
R
R
Institute of Medical Chemistry, Hoshi University, Tokyo, Japan.
Kasuga
A
A
Inoue
S
S
Ikeda
K
K
Samejima
Y
Y
D000595:Amino Acid Sequence; D000818:Animals; D002850:Chromatography, Gel; D002851:Chromatography, High Pressure Liquid; D003435:Crotalid Venoms / Q000737:chemistry*; D004305:Dose-Response Relationship, Drug; D005748:Gastric Fundus / Q000187:drug effects; D008297:Male; D013058:Mass Spectrometry; D008969:Molecular Sequence Data; D009119:Muscle Contraction / Q000187:drug effects*; D009130:Muscle, Smooth / Q000187:drug effects*; D009842:Oligopeptides / Q000302:isolation & purification / Q000494:pharmacology*; D051381:Rats; D017208:Rats, Wistar; D017819:Viperidae
D003435:Crotalid Venoms; D009842:Oligopeptides