1. Academic Validation
  2. Physical and functional interaction of KV10.1 with Rabaptin-5 impacts ion channel trafficking

Physical and functional interaction of KV10.1 with Rabaptin-5 impacts ion channel trafficking

  • FEBS Lett. 2012 Sep 21;586(19):3077-84. doi: 10.1016/j.febslet.2012.07.055.
Milena Ninkovic 1 Mišo Mitkovski Tobias Kohl Walter Stühmer Luis A Pardo
Affiliations

Affiliation

  • 1 Department of Molecular Biology of Neuronal Signals, Max-Planck-Institute of Experimental Medicine, Göttingen, Germany.
Abstract

K(V)10.1 is a Potassium Channel expressed in brain and implicated in tumor progression. We have searched for proteins interacting with K(V)10.1 and identified Rabaptin-5, an effector of the Rab5 GTPase. Both proteins co-localize on large early endosomes induced by Rab5 hyperactivity. Silencing of Rabaptin-5 induces down-regulation of recycling of K(V)10.1 channel in transfected cells and reduction of K(V)10.1 current density in cells natively expressing K(V)10.1, indicating a role of Rabaptin-5 in channel trafficking. K(V)10.1 co-localizes, but does not physically interact, with Rab7 and Rab11. Our data highlights the complex control of the amount of K(V)10.1 channels on the cell surface.

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