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Related Experiment Videos

S-acylation regulates Kv1.5 channel surface expression.

Lian Zhang1, Karyn Foster, Qiuju Li

  • 1Dept. of Pharmacology, University of Michigan, 1150 W. Medical Center Dr., 1301 MSRB III, Ann Arbor, MI 48109-0632, USA.

American Journal of Physiology. Cell Physiology
|March 9, 2007
PubMed
Summary
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S-acylation, a modification of Kv1.5 potassium channels, regulates their cell surface expression. Inhibiting S-acylation leads to channel degradation, highlighting its role in channel trafficking and quality control.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Biochemistry

Background:

  • Cell surface ion channels, particularly voltage-gated K(+) (Kv) channels, are crucial for electrical signaling in excitable cells.
  • Aberrant expression of Kv channels can be detrimental, leading to cytotoxicity and disease.
  • Post-translational modifications play a significant role in regulating ion channel function and localization.

Purpose of the Study:

  • To investigate the role of S-acylation in the cell surface expression of the Kv1.5 channel.
  • To elucidate the mechanisms by which S-acylation affects Kv1.5 trafficking and stability.

Main Methods:

  • Transfected fibroblasts were used to study Kv1.5 expression.
  • Biochemical assays were employed to detect post-translational modifications.

Related Experiment Videos

  • Pharmacological inhibitors of S-acylation and proteasome inhibitors were utilized.
  • Mutational analysis of cysteine residues was performed.

    • Main Results:

    • Kv1.5 undergoes S-acylation at both NH(2) and COOH termini via hydroxylamine-sensitive thioester bonds.
    • Inhibition of S-acylation decreased Kv1.5 cell surface expression, causing accumulation in intracellular compartments and proteasomal degradation.
    • S-acylation occurs during the biosynthesis of nascent Kv1.5 protein.
    • COOH-terminal cysteines are critical for S-acylation, but their mutation paradoxically increases cell surface expression.

    Conclusions:

    • S-acylation is a novel regulatory mechanism for steady-state Kv1.5 expression.
    • Fatty acylation of intracellular cysteines acts as a quality control mechanism for Kv1.5 channel trafficking.
    • This finding provides insights into the regulation of ion channel expression and potential therapeutic targets for channelopathies.