LymnaDFamides, a new family of neuropeptides from the pond snail, Lymnaea stagnalis. Clue to cholecystokinin immunoreactivity in invertebrates?

A H Johnsen, J F Rehfeld

Abstract

Five tridecapeptides have been identified from the central nervous system of the pond snail, Lymnaea stagnalis. The sequences are Pro-Xaa-Asp-Arg-Ile-Ser-Yaa-Ser-Ala-Phe-Ser-Asp-Phe. NH2, where Xaa is either Tyr or Phe and Yaa either Asn, Ser or Gly. The peptides are named lymnaDFamides to acknowledge identity with the C-terminal dipeptide of the mammalian neuropeptides, cholecystokinin (CCK) and gastrin. They were detected by an antiserum that recognizes the biologically active C-termini of cholecystokinin and gastrin. LymnaDFamide-1 (Xaa = Tyr and Yaa = Asn) had no effect on trout gallbladder, which responds equally to CCK and gastrin. We propose that the lymnaDFamides belong to an Asp-Phe-amide superfamily, which includes CCK and gastrin, and suggest that the widespread CCK/gastrin immunoreactivity in invertebrates is due to peptides belonging to such a superfamily.

OriginalsprogEngelsk
TidsskriftEuropean Journal of Biochemistry
Vol/bind213
Udgave nummer2
Sider (fra-til)875-9
Antal sider5
ISSN0014-2956
DOI
StatusUdgivet - 15 apr. 1993
Udgivet eksterntJa

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