title: Isolation of a peptide structurally related to mammalian corticostatins from the lamprey Petromyzon marinus.
abstract: Peptides in an extract of skin from the agnathan Petromyzon marinus (sea lamprey) were purified by reversed-phase high-performance liquid chromatography and characterized by Edman degradation. The primary structure of a cysteine- and arginine-rich peptide (termed lamprey corticostatin-related peptide [LCRP]) was established as Cys-Pro-Cys-Gly-Arg-Arg-Arg-Cys-Cys-Val-Arg-Gly-Leu-Asn-Val-Tyr-Cys-Cys- Phe. Mass spectrometry indicated that all cysteine residues are intramolecularly linked. This amino acid sequence shows structural similarity to rat corticostatin R4 and rabbit corticostatin R1. In particular, LCRP contains the polyarginine sequence at the N-terminus of the peptide that is believed to mediate both the inhibition of ACTH stimulated steroidogenesis and the antimicrobial (defensin-like) actions of the corricostatins.
authors: Department of Biomedical Sciences, Creighton University School of Medicine, Omaha, NE 68178, USA.
authors: J M
authors: JM
authors: Conlon
authors: S A
authors: SA
authors: Sower
mesh_terms: D000595:Amino Acid Sequence; D000596:Amino Acids / Q000032:analysis; D000818:Animals; D005260:Female; D036341:Intercellular Signaling Peptides and Proteins; D007798:Lampreys / Q000502:physiology*; D008322:Mammals; D008969:Molecular Sequence Data; D010455:Peptides / Q000737:chemistry* / Q000302:isolation & purification; D011817:Rabbits; D051381:Rats; D017386:Sequence Homology, Amino Acid; D012867:Skin / Q000737:chemistry
chemical_list: D000596:Amino Acids; D036341:Intercellular Signaling Peptides and Proteins; D010455:Peptides; C101546:corticostatin-related peptide, lamprey; C054598:corticostatin