title: Cortactin controls surface expression of the voltage-gated potassium channel K(V)10.1.
abstract: K(V)10.1 is a voltage-gated potassium channel aberrantly expressed in many cases of cancer, and participates in cancer initiation and tumor progression. Its action as an oncoprotein can be inhibited by a functional monoclonal antibody, indicating a role for channels located at the plasma membrane, accessible to the antibody. Cortactin is an actin-interacting protein implicated in cytoskeletal architecture and often amplified in several types of cancer. In this study, we describe a physical and functional interaction between cortactin and K(V)10.1. Binding of these two proteins occurs between the C terminus of K(V)10.1 and the proline-rich domain of cortactin, regions targeted by many post-translational modifications. This interaction is specific for K(V)10.1 and does not occur with K(V)10.2. Cortactin controls the abundance of K(V)10.1 at the plasma membrane and is required for functional expression of K(V)10.1 channels.
authors.affiliation: Oncophysiology Group, Max-Planck Institute of Experimental Medicine, Hermann-Rein-Str. 3, 37075 Göttingen, Germany.
authors.forename: Solveig
authors.initials: S
authors.lastname: Herrmann
authors.forename: Milena
authors.initials: M
authors.lastname: Ninkovic
authors.forename: Tobias
authors.initials: T
authors.lastname: Kohl
authors.forename: Éva
authors.initials: É
authors.lastname: Lörinczi
authors.forename: Luis A
authors.initials: LA
authors.lastname: Pardo
mesh_terms: D002462:Cell Membrane / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D051356:Cortactin / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D051638:Ether-A-Go-Go Potassium Channels / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D005786:Gene Expression Regulation; D006367:HeLa Cells; D006801:Humans; D011188:Potassium / Q000378:metabolism; D011485:Protein Binding; D017434:Protein Structure, Tertiary
chemical_list: C495868:CTTN protein, human; D051356:Cortactin; D051638:Ether-A-Go-Go Potassium Channels; C496884:KCNH1 protein, human; D011188:Potassium