Isolation, pharmacology and gene organization of KPSFVRFamide: A neuropeptide from Caenorhabditis elegans

Nicola Marks, Aaron Maule, C. Li, L.S. Nelson, D.P. Thompson, S. Alexander-Bowman, T.G. Geary, David Halton, P. Verhaert, Christopher Shaw

Research output: Contribution to journalArticlepeer-review

29 Citations (Scopus)


To date, 53 peptides with C-terminal RFamides have been identified by the genome sequencing project in the nematode, Caenorhabditis elegans. In this study the FMRFamide-related peptide (FaRP) KPSFVRFamide (879.90 Da [MH](+)) was structurally characterized from extracts of the nematode, Caenorhabditis elegans. Two copies of KPSFVRFamide are encoded by a gene designated flp-9. RT-PCR identified a single cDNA product which was confirmed as flp-9 by sequence determination. Flp-9 cDNA was isolated from larval stages of C. elegans but was not detected-in adult worms, indicating that its expression is may be developmentally regulated. KPSFVRFamide displays sequence homology to the nematode peptide, KPNFIRFamide (PF4). The physiological effects of KPSFVRFamide, PF4 and the chimeras, KPNFVRFamide and KPSFIRFamide, were measured on body wall muscle and the vagina vera of the parasitic nematode, Ascaris suum. KPNFVRFamide and KPNFIRFamide had Cl--dependent inhibitory activity on innervated and denervated muscle-preparations, whereas KPSFVRFamide and KPSFIRFamide did not elicit a detectable physiological effect. Although all 4 peptides had inhibitory effects on the vagina vera, KPSFVRFamide and KPSFIRFamide (threshold, greater than or equal to 0.1 mu M) were less potent than KPNFVRFamide and KPNFIRFamide (threshold, greater than or equal to 10 nM). (C) 1999 Academic Press.
Original languageEnglish
Pages (from-to)222-230
Number of pages9
JournalBiochemical and Biophysical Research Communications
Issue number1
Publication statusPublished - 08 Jan 1999

ASJC Scopus subject areas

  • Biochemistry
  • Biophysics
  • Molecular Biology


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