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Cortactin controls surface expression of the voltage-gated potassium channel K(V)10.1

Solveig Herrmann1, Milena Ninkovic, Tobias Kohl

  • 1Oncophysiology Group, Max-Planck Institute of Experimental Medicine, Hermann-Rein-Str. 3, 37075 Göttingen, Germany.

The Journal of Biological Chemistry
|November 13, 2012
PubMed

Insights

Cortactin interacts with the K(V)10.1 channel, an oncoprotein involved in cancer. This interaction regulates K(V)10.1 channel abundance at the cell membrane, impacting cancer progression.

Area of Science:

  • Molecular and Cellular Biology
  • Oncology
  • Biophysics

Background:

  • K(V)10.1 (Voltage-gated potassium channel subfamily 10 member 1) is aberrantly expressed in various cancers, contributing to tumor initiation and progression.
  • Cortactin, an actin-interacting protein, is frequently amplified in cancers and plays a role in cytoskeletal dynamics.
  • The plasma membrane localization of K(V)10.1 is crucial for its oncogenic activity, as evidenced by antibody inhibition.

Purpose of the Study:

  • To investigate a potential physical and functional interaction between the K(V)10.1 channel and cortactin.
  • To elucidate the molecular basis and functional consequences of the K(V)10.1-cortactin interaction.
  • To determine if this interaction is specific to K(V)10.1 and its role in channel regulation.

Main Methods:

  • Co-immunoprecipitation assays to demonstrate physical binding between K(V)10.1 and cortactin.
  • Analysis of protein interaction domains, focusing on the C terminus of K(V)10.1 and the proline-rich domain of cortactin.
  • Cellular localization studies to assess the impact of cortactin on K(V)10.1 plasma membrane abundance.
  • Functional assays to evaluate the role of the interaction in K(V)10.1 channel activity.

Main Results:

  • A specific physical interaction was identified between the C terminus of K(V)10.1 and the proline-rich domain of cortactin.
  • This interaction was found to be specific for K(V)10.1, with no binding observed for K(V)10.2.
  • Cortactin was shown to regulate the abundance of K(V)10.1 at the plasma membrane and is essential for its functional expression.

Conclusions:

  • Cortactin physically and functionally interacts with the K(V)10.1 channel.
  • Cortactin plays a critical role in controlling K(V)10.1 plasma membrane localization and functional expression.
  • This interaction represents a novel regulatory mechanism for K(V)10.1 in cancer, highlighting a potential therapeutic target.

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