title: Identification and characterization of two dermorphins from skin extracts of the Amazonian frog Phyllomedusa bicolor.
abstract: Skin extracts of South American hylid frogs of the subfamily Phyllomedusinae contain dermorphins and deltorphins, opioid heptapeptides highly selective for either mu or delta receptors. In all these peptides, a D-amino acid is present in the second position. The structure of the precursors for Ala-deltorphins was recently deduced from cloned cDNAs derived from skin of Phyllomedusa bicolor (Richter et al. (1990) Proc. Natl. Acad. Sci. USA 87, 4836-4839). From the amino acid sequence of these precursors, the existence of three peptides related to dermorphin could be predicted. From methanol extracts of skin of Ph. bicolor we have isolated two of these peptides, [Lys7]dermorphin-OH and [Trp4,Asn7]dermorphin-OH. The biological activity of these new dermorphins and their amidated counterparts is presented.
authors.affiliation: Dipartimento di Scienze Biochimiche A. Rossi Fanelli, Università La Sapienza, Roma, Italy.
authors.forename: G
authors.initials: G
authors.lastname: Mignogna
authors.forename: C
authors.initials: C
authors.lastname: Severini
authors.forename: M
authors.initials: M
authors.lastname: Simmaco
authors.forename: L
authors.initials: L
authors.lastname: Negri
authors.forename: G F
authors.initials: GF
authors.lastname: Erspamer
authors.forename: G
authors.initials: G
authors.lastname: Kreil
authors.forename: D
authors.initials: D
authors.lastname: Barra
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001001:Anura; D002851:Chromatography, High Pressure Liquid; D006168:Guinea Pigs; D007421:Intestine, Small / Q000502:physiology; D008297:Male; D051379:Mice; D008969:Molecular Sequence Data; D009119:Muscle Contraction / Q000187:drug effects; D009842:Oligopeptides / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D018847:Opioid Peptides; D012867:Skin / Q000737:chemistry*; D014649:Vas Deferens / Q000502:physiology
chemical_list: D009842:Oligopeptides; D018847:Opioid Peptides; C030058:dermorphin