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Nuclear translocation and transcription regulation by the membrane-associated guanylate kinase CASK/LIN-2 | | Y P Hsueh
; T F Wang
; F C Yang
; M Sheng
; | | Date: |
16 Mar 2000 | | Journal: | Nature, 404 (6775), 298-302 | | Abstract: | Membrane-associated guanylate kinases (MAGUKs) contain multiple protein-binding domains that allow them to assemble specific multiprotein complexes in particular regions of the cell. CASK/LIN-2, a MAGUK required for EGF receptor localization and signalling in Caenorhabditis elegans, contains a calmodulin-dependent protein kinase-like domain followed by PDZ, SH3 and guanylate kinase-like domains. In adult rat brain, CASK is concentrated at neuronal synapses and binds to the cell-surface proteins neurexin and syndecan and the cytoplasmic proteins Mint/LIN-10 and Veli/LIN-7. Here we report that, through its guanylate kinase domain, CASK interacts with Tbr-1, a T-box transcription factor that is involved in forebrain development. CASK enters the nucleus and binds to a specific DNA sequence (the T-element) in a complex with Tbr-1. CASK acts as a coactivator of Tbr-1 to induce transcription of T-element containing genes, including reelin, a gene that is essential for cerebrocortical development. Our findings show that a MAGUK which is usually associated with cell junctions has a transcription regulation function. | | Source: | PubMed, pmid10749215 doi: 10.1038/35005118 | | Services: | Forum | Review | Favorites | |
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