Isolation and structure of a novel charged member of the red-pigment-concentrating hormone-adipokinetic hormone family of peptides isolated from the corpora cardiaca of the blowfly Phormia terraenovae (Diptera)

Biochem J. 1990 Jul 15;269(2):309-13. doi: 10.1042/bj2690309.

Abstract

A hypertrehalosaemic neuropeptide from the corpora cardiaca of the blowfly Phormia terraenovae has been isolated by reversed-phase h.p.l.c., and its primary structure was determined by pulsed-liquid phase sequencing employing Edman chemistry after enzymically deblocking the N-terminal pyroglutamate residue. The C-terminus was also blocked, as indicated by the lack of digestion when the peptide was incubated with carboxypeptidase A. The octapeptide has the sequence pGlu-Leu-Thr-Phe-Ser-Pro-Asp-Trp-NH2 and is clearly defined as a novel member of the RPCH/AKH (red-pigment-concentrating hormone/adipokinetic hormone) family of peptides. It is the first charged member of this family to be found. The synthetic peptide causes an increase in the haemolymph carbohydrate concentration in a dose-dependent fashion in blowflies and therefore is named 'Phormia terraenovae hypertrehalosaemic hormone' (Pht-HrTH). In addition, receptors in the fat-body of the American cockroach (Periplaneta americana) recognize the peptide, resulting in carbohydrate elevation in the blood. However, fat-body receptors of the migratory locust (Locusta migratoria) do not recognize this charged molecule, and thus no lipid mobilization is observed in this species.

Publication types

  • Comparative Study
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Amino Acid Sequence
  • Amino Acids / analysis
  • Animals
  • Chromatography, High Pressure Liquid
  • Diptera / analysis*
  • Insect Hormones* / isolation & purification*
  • Molecular Sequence Data
  • Neurosecretory Systems / analysis*
  • Oligopeptides* / isolation & purification*
  • Oligopeptides* / metabolism*
  • Pyrrolidonecarboxylic Acid / analogs & derivatives

Substances

  • Amino Acids
  • Insect Hormones
  • Oligopeptides
  • adipokinetic hormone
  • DAKH peptide
  • red pigment-concentrating hormone
  • Pyrrolidonecarboxylic Acid