Deduced Amino Acid Sequence of a Putative Sodium Channel from the Scyphozoan Jellyfish Cyanea Capillata

Overview

Journal Proc Natl Acad Sci U S A

Specialty Science

Date 1993 Aug 1

PMID 8394021

Citations 17

Authors

P A Anderson

M A Holman

R M Greenberg

Affiliations

Soon will be listed here.

Abstract

Members of the phylum Cnidaria are the lowest extant organisms to possess a nervous system and are the first that are known to contain cells that produce action potentials carried exclusively by Na+ ions. They thus occupy an important position in the evolution of Na+ channels. A cDNA encoding a 198-kDa protein with high sequence identity to known Na+ channels was isolated from the scyphozoan jellyfish Cyanea capillata. The similarity between this and other Na+ channels is greatest in the transmembrane segments and the putative pore region and less so in the cytoplasmic loops that link the four domains of the protein. Phylogenetic analysis of the deduced protein reveals that it is closely related to known Na+ channels, particularly those of squid and Drosophila, and more distantly separated from Ca2+ channels. Scrutiny of the Cyanea channel in regions corresponding to those purported to form the tetrodotoxin receptor and selectivity filter of Na+ channels in higher animals reveals several anomalies that suggest that current models of the location of the tetrodotoxin binding site and Na+ channel selectivity filter are incomplete.

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