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Surface expression of the Anoctamin-1 (ANO1) channel is suppressed by protein-protein interactions with β-COP

Young-Sun Lee1, Yeonju Bae2, Nammi Park2

  • 1School of Biosystem and Biomedical Science, College of Health Science, Korea University, Seoul 02841, Republic of Korea; Center for Functional Connectomics, Korea Institute of Science and Technology (KIST), Seoul 02792, Republic of Korea.

Biochemical and Biophysical Research Communications
|May 22, 2016
PubMed

Insights

Coat Protein Complex I (COPI) subunit β-COP directly interacts with Anoctamin-1 (ANO1), a calcium-activated chloride channel. This interaction reduces ANO1 surface expression and channel activity, suggesting β-COP negatively regulates ANO1 trafficking.

Area of Science:

  • Cell biology
  • Ion channel physiology

Background:

  • Anoctamin-1 (ANO1) is a calcium-activated chloride channel (CaCC) crucial for physiological functions in various tissues.
  • The mechanisms governing ANO1's transport to the plasma membrane are not well understood.

Purpose of the Study:

  • To investigate the molecular mechanisms regulating ANO1 plasma membrane trafficking.
  • To identify proteins that interact with ANO1 and influence its surface expression.

Main Methods:

  • Yeast two-hybrid screening to identify ANO1 interacting proteins.
  • In vitro and in vivo binding assays to confirm ANO1-β-COP interaction.
  • HEK293T cell cotransfection experiments to assess the impact of β-COP on ANO1.
  • Analysis of endogenous ANO1 and β-COP association in U251 glioblastoma cells.
  • β-COP silencing experiments to evaluate its effect on ANO1 surface expression and activity.

Main Results:

  • Direct interaction between ANO1 and β-COP, a subunit of Coat Protein Complex I (COPI), was identified.
  • Co-expression of β-COP with ANO1 reduced ANO1 surface expression and channel activity in HEK293T cells.
  • Endogenous ANO1 was found to associate with β-COP in U251 glioblastoma cells.
  • Silencing of β-COP led to increased surface expression and whole-cell currents of ANO1 in U251 cells.

Conclusions:

  • β-COP directly interacts with ANO1.
  • β-COP negatively regulates the surface expression and activity of ANO1.
  • These findings elucidate a novel mechanism controlling ANO1 plasma membrane localization and function.
Keywords:
ANO1Protein–protein interactionsSurface expressionU251 glioblastoma cellsYeast two-hybrid screeningβ-COP

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