title: Chemical identification of catfish growth hormone and prolactin.
abstract: Isolation and primary structure of growth hormone (GH) and prolactin (PRL) from the pituitary gland of catfish (Ictalurus punctatus) are described. Alkaline extract of the pituitary glands was fractionated by gel filtration on Sephadex G-75, ion-exchange chromatography on DEAE-cellulose, and reversed-phase high-performance liquid chromatography on Octadecyl silica ODS. Catfish GH and PRL were identified by Western blotting with antisera against chum salmon GH and PRL. The catfish GH consists of 178 residues and is the most similar to carp GH, with sequence identity of 77%, although there is an uninterrupted deletion of 10 amino acid residues that corresponds to carp GH (90-99). The PRL is composed of 187 residues, which also exhibits the highest identity (79%) with carp PRL. Sequence identity between catfish GH and PRL is only 27%.
authors.affiliation: Laboratory of Molecular Endocrinology, School of Fisheries Sciences, Kitasato University, Iwate, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Watanabe
authors.forename: A
authors.initials: A
authors.lastname: Igarashi
authors.forename: T
authors.initials: T
authors.lastname: Noso
authors.forename: T T
authors.initials: TT
authors.lastname: Chen
authors.forename: R A
authors.initials: RA
authors.lastname: Durham
authors.forename: H
authors.initials: H
authors.lastname: Kawauchi
mesh_terms: D000595:Amino Acid Sequence; D000596:Amino Acids / Q000032:analysis; D000818:Animals; D015153:Blotting, Western; D002845:Chromatography; D004591:Electrophoresis, Polyacrylamide Gel; D013006:Growth Hormone / Q000737:chemistry* / Q000302:isolation & purification; D007059:Ictaluridae / Q000378:metabolism*; D008969:Molecular Sequence Data; D010446:Peptide Fragments / Q000302:isolation & purification; D010449:Peptide Mapping; D011388:Prolactin / Q000737:chemistry* / Q000302:isolation & purification; D017386:Sequence Homology, Amino Acid
chemical_list: D000596:Amino Acids; D010446:Peptide Fragments; D011388:Prolactin; D013006:Growth Hormone