title: The Kvβ2 subunit of voltage-gated potassium channels is interacting with ProSAP2/Shank3 in the PSD.
abstract: The postsynaptic density is an electron dense meshwork composed of a variety of molecules facilitating neuronal signal transmission. ProSAP2/Shank3 represents a crucial player at postsynaptic sites, assembling large multimeric platforms and anchoring numerous other molecules, thereby linking the functional synapse with the cytoskeleton. ProSAP2/Shank3 is also implicated in the pathogenesis of numerous diseases, including autism spectrum disorders. KvBeta2 (Kvβ2) on the other hand serves as a regulatory subunit of voltage-gated potassium channels. Kvβ2 is located at various sites in the neuron including the axon (binding to Kv1.2), the dendrites (binding to Kv4.2) and the synapse. Binding of Kvβ2 to either Kv1.2 or Kv4 modulates not only the channel conformation but directs targeting of the channel protein complex to distinct loci within the cell. Thus an interaction between ProSAP2 and Kvβ2 could have important roles at diverse cellular compartments and moreover during maturation stages. We report here on the direct protein-protein interaction of the postsynaptic density anchoring molecule ProSAP2 and the potassium channel subunit Kvβ2, initially identified in a yeast-two-hybrid-screen. Furthermore, we characterize this interaction at synapses using primary hippocampal neurons in vitro.
authors.affiliation: Institute for Anatomy and Cell Biology, Ulm University, Ulm, Germany.
authors.forename: C
authors.initials: C
authors.lastname: Proepper
authors.affiliation: Institute for Anatomy and Cell Biology, Ulm University, Ulm, Germany.
authors.forename: S
authors.initials: S
authors.lastname: Putz
authors.affiliation: Department of Internal Medicine 1, Ulm University Hospital, Ulm, Germany.
authors.forename: R
authors.initials: R
authors.lastname: Russell
authors.affiliation: Institute for Anatomy and Cell Biology, Ulm University, Ulm, Germany.
authors.forename: T M
authors.initials: TM
authors.lastname: Boeckers
authors.affiliation: Institute for Anatomy and Cell Biology, Ulm University, Ulm, Germany; Institute of Neuroanatomy, University of Tuebingen, Tuebingen, Germany. Electronic address: stefan.liebau@uni-tuebungen.de.
authors.forename: S
authors.initials: S
authors.lastname: Liebau
mesh_terms: D000818:Animals; D015153:Blotting, Western; D019556:COS Cells; D002478:Cells, Cultured; D002522:Chlorocebus aethiops; D006624:Hippocampus / Q000254:growth & development / Q000378:metabolism; D007150:Immunohistochemistry; D017403:In Situ Hybridization; D051379:Mice; D016253:Microscopy, Immunoelectron; D008954:Models, Biological; D009419:Nerve Tissue Proteins / Q000235:genetics / Q000378:metabolism*; D009474:Neurons / Q000378:metabolism*; D054731:PDZ Domains; D057907:Post-Synaptic Density / Q000378:metabolism*; D024642:Potassium Channels, Voltage-Gated / Q000235:genetics / Q000378:metabolism*; D051381:Rats; D017207:Rats, Sprague-Dawley; D051637:Shaker Superfamily of Potassium Channels / Q000235:genetics / Q000378:metabolism*; D014162:Transfection; D020798:Two-Hybrid System Techniques
chemical_list: C101328:Kcnab2 protein, mouse; C426239:Kcnab2 protein, rat; D009419:Nerve Tissue Proteins; D024642:Potassium Channels, Voltage-Gated; D051637:Shaker Superfamily of Potassium Channels; C120532:Shank3 protein, rat
keywords: Kvβ2; PSD; ProSAP2/Shank3; beta-subunit; interaction; kv-channel