Assembly of Dishevelled 3-based supermolecular complexes via phosphorylation and Axin
Tóm tắt
Dishevelled-3 (Dvl3) is a multivalent scaffold essential to cell signaling in development. Dsh/Dvls enable a myriad of protein-protein interactions in Wnt signaling. In the canonical Wnt/β-catenin pathway specifically, Dvl3 polymerizes to form dynamic protein aggregates, so-called “signalsomes”, which propagate signals from the Wnt receptor Frizzled to downstream elements. Very large Dvl3-based supermolecular complexes form in response to Wnt3a. These complexes are identified by steric-exclusion chromatography, affinity pull-downs, proteomics, and fluorescence correlation microscopy (fcs). In the current work, the roles of Dvl3 phosphorylation and of Axin in the assembly of Dvl3-based supermolecular complexes in response to Wnt3a are probed in totipotent mouse F9 teratocarcinoma cells. Point mutations of phosphorylation sites of Dvl3 which interfere with Lef/Tcf-sensitive transcriptional activation by Wnt3a are shown to interfere more proximally with the assembly of Dvl3-based supermolecular complexes. Axin, a Dvl-interacting protein, plays a central role in organizing the beta-catenin destruction complex. The assembly of Dvl3-based supermolecular complexes is blocked either by depletion of Axin or by mutation of Axin sites necessary for polymerization in response to Wnt3a. These data demonstrate that Wnt3a activation of the canonical pathway requires specific phosphorylation events as well as Axin to assemble very large, Dvl3-based supermolecular complexes; these complexes are a prerequisite to activation of Lef/Tcf-sensitive transcription.
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