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Updated: Aug 1, 2026

High Precision FRET at Single-molecule Level for Biomolecule Structure Determination
Published on: May 13, 2017
Location of a ligand recognition site of FMRFamide-gated Na(+) channels
G A Cottrell1, M C Jeziorski, K A Green
1School of Biology, University of St. Andrews, Fife, UK. gac@st-andrews.ac.uk
Abstract:
The second FMRFamide-gated Na(+) channel (HtFaNaC), from Helisoma trivolvis, has been cloned. HtFaNaC has some different pharmacological properties to HaFaNaC, from Helix aspersa, which has enabled a rational approach to be made to start to identify the FMRFamide recognition site. Several chimeras were made by switching sections between the channels. The differences in sensitivity to FMRFamide, and amiloride, were assessed after expression in Xenopus oocytes. The data suggest that a recognition site for FMRFamide, and the potentiating action of amiloride, resides in a sequence of about 120 amino acids in the extracellular loop proximal to the first transmembrane segment.
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