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The sodium channel from rat brain. Purification and subunit composition.

R P Hartshorne, W A Catterall

    The Journal of Biological Chemistry
    |February 10, 1984
    PubMed
    Summary

    Researchers purified the rat brain sodium channel, identifying its three main subunits (alpha, beta1, beta2) and their stoichiometry. This purified channel binds saxitoxin, crucial for understanding neuronal function.

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    Area of Science:

    • Neuroscience
    • Molecular Biology
    • Biochemistry

    Background:

    • Sodium channels are critical for neuronal electrical excitability.
    • Understanding the molecular composition of sodium channels is essential for neuroscience research.
    • Previous purification methods yielded heterogeneous or unstable channel preparations.

    Purpose of the Study:

    • To develop a procedure for purifying the rat brain sodium channel to essential homogeneity.
    • To characterize the subunit composition and stoichiometry of the purified sodium channel.
    • To investigate the binding properties of the purified channel with saxitoxin (STX).

    Main Methods:

    • Solubilization of sodium channels from rat brain using Triton X-100.
    • Stabilization with phosphatidylcholine and calcium chloride (CaCl2).
    • Purification via sequential chromatography (DEAE-Sephadex, hydroxylapatite, wheat germ agglutinin/Sepharose) and sucrose gradient sedimentation.
    • Analysis of subunit composition using sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) and silver staining.
    • Quantification of saxitoxin (STX) binding activity.

    Main Results:

    • Achieved a 1380-fold purification of the sodium channel to essential homogeneity.
    • The purified channel preparation exhibited high saxitoxin (STX) binding capacity (0.9 mol STX/mol channel).
    • Identified three major polypeptide subunits: alpha (Mr ~260,000), beta 1 (Mr ~39,000), and beta 2 (Mr ~37,000), comprising 90% of the protein.
    • Demonstrated a proposed subunit stoichiometry of alpha 1(beta 1)1(beta 2)1.
    • Observed anomalous electrophoretic behavior of the alpha subunit in SDS-PAGE.

    Conclusions:

    • A robust purification protocol for the rat brain sodium channel was established.
    • The purified sodium channel consists of three distinct subunits with a defined stoichiometry.
    • The characterized purified sodium channel is suitable for further biochemical and functional studies.

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