PdT-2: a novel myotropic type-2 tryptophyllin from the skin secretion of the Mexican giant leaf frog, Pachymedusa dacnicolor.
Amphibian skin secretions represent a unique resource for the discovery of new bioactive peptides. Here we report the isolation, structural and functional characterization of a novel heptapeptide amide, DMSPPWHamide, from the defensive skin secretion of the Mexican giant leaf frog, Pachymedusa dacnicolor. This peptide is of unique primary structure and has been classified as a member of the rather heterogenous tryptophyllin-2 (T-2) family of amphibian skin peptides and named P. dacnicolor Tryptophyllin-2 (PdT-2) in accordance. PdT-2 is the first Type 2-tryptophyllin to possess discrete bioactivity. Both natural and synthetic replicates of the peptide were found to contract the smooth muscle of rat urinary bladder, the latter displaying an EC50 of 4 nM.
Molecular Therapeutics Research, School of Pharmacy, Queen's University, Lisburn Road, Belfast BT9 7BL, Northern Ireland, UK.
Lei
L
Wang
Mei
M
Zhou
Tianbao
T
Chen
Brian
B
Walker
Chris
C
Shaw
D000595:Amino Acid Sequence; D000818:Animals; D001001:Anura / Q000378:metabolism*; D001483:Base Sequence; D002851:Chromatography, High Pressure Liquid; D008297:Male; D008969:Molecular Sequence Data; D009119:Muscle Contraction / Q000187:drug effects; D009130:Muscle, Smooth / Q000187:drug effects; D009842:Oligopeptides / Q000737:chemistry / Q000302:isolation & purification / Q000378:metabolism* / Q000494:pharmacology*; D051381:Rats; D017208:Rats, Wistar; D016415:Sequence Alignment; D012867:Skin / Q000378:metabolism*
D009842:Oligopeptides; C048291:tryptophyllins