title: The crustacean hyperglycemic hormones from an euryhaline crab Pachygrapsus marmoratus and a fresh water crab Potamon ibericum: eyestalk and pericardial isoforms.
abstract: The structures of crustacean hyperglycemic hormones (CHH) were investigated in two crabs, the coastal euryhaline crab Pachygrapsus marmoratus and the fresh water crab Potamon ibericum. The neuropeptide mRNAs were extracted from pericardial and X-organs (PO and XO), and the sequences of the cDNA encoding the hormones' precursors were determined. The X-organ preprohormones are composed of 29 and 28 amino acid signal peptides in P. marmoratus and P. ibericum respectively, followed by 43 and 41 amino acid crustacean hyperglycemic hormone precursor related peptide (CPRP) flanking the 72 amino acid crustacean hyperglycemic hormones. A similar organization is reported for pericardial preprohormones with identical sequences for the signal peptide, the CPRP and the N-terminal sequences of CHH (1-40), but remaining sequences (41-72 and 41-71) differing considerably. In P. marmoratus two CHH cDNAs were characterized from XO and evidences were obtained for the existence of at least two forms in the PO. From our results and by comparison with other known sequences, a consensus pattern for crab pericardial CHH could be pointed out. Analysis of the data presented in this article using phylogenetic methods reveals that the two crab species studied are much closer than previously predicted.
authors.affiliation: Groupe Biogenèse des Peptides Isomères, CNRS FRE 2852, Protéines: Biochimie structurale et fonctionnelle, Université Pierre et Marie Curie, 7 Quai St. Bernard, 75252 Paris cedex 05, France. jean-yves.toullec@upmc.fr
authors.forename: Jean-Yves
authors.initials: JY
authors.lastname: Toullec
authors.forename: Laetitia
authors.initials: L
authors.lastname: Serrano
authors.forename: Philippe
authors.initials: P
authors.lastname: Lopez
authors.forename: Daniel
authors.initials: D
authors.lastname: Soyez
authors.forename: Céline
authors.initials: C
authors.lastname: Spanings-Pierrot
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D003386:Brachyura; D002851:Chromatography, High Pressure Liquid; D006728:Hormones / Q000737:chemistry*; D006943:Hyperglycemia / Q000378:metabolism*; D008969:Molecular Sequence Data; D010455:Peptides / Q000737:chemistry; D010496:Pericardium / Q000378:metabolism*; D010786:Photoreceptor Cells / Q000737:chemistry*; D020033:Protein Isoforms; D017386:Sequence Homology, Amino Acid; D012689:Sequence Homology, Nucleic Acid; D013045:Species Specificity
chemical_list: D006728:Hormones; D010455:Peptides; D020033:Protein Isoforms