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Identified ion channels in the squid nervous system.

J J C Rosenthal¹, W F Gilly

¹Department of Physiology, UCLA School of Medicine, Los Angeles, California, USA.

|August 9, 2003

Summary

Identifying molecular identities of ion channels and transporters in the squid giant axon is complex. mRNA editing and channel subunit interactions create diverse protein variants from single genes.

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Area of Science:

Neuroscience
Molecular Biology
Biophysics

Background:

The squid giant axon is a classical model for understanding ion channels and neuronal function.
Key physiological properties of voltage-sensitive ion channels and transporters were extensively studied in this system.

Purpose of the Study:

To review efforts in assigning molecular identities to the well-characterized physiological functions of the squid giant axon.
To discuss challenges in equating cloned gene products with native channel and transporter proteins.

Main Methods:

Isolation of molecular candidates for voltage-gated Na(+), K(+), and Ca(2+) channels and ion transporters from the squid nervous system.
Integration of physiological and molecular data to identify native counterparts of cloned genes.

Main Results:

Molecular candidates for key ion channels and transporters have been identified in the squid.
The delayed rectifier K(+) conductance serves as a complex example, involving heteromultimerization and extensive mRNA editing.

Conclusions:

Assigning molecular identities to squid giant axon proteins is challenging due to factors like heteromultimerization and RNA editing.
The squid giant axon is crucial for studying the biological significance of mRNA editing in generating protein diversity.

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