Wnt Signalosome Assembly by DEP Domain Swapping of Dishevelled.
Wnt Signalosome Assembly by DEP Domain Swapping of Dishevelled.
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DOI:
10.1016/j.molcel.2016.08.026
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发表时间:
2016-10-06
期刊:
影响因子:
16
通讯作者:
Bienz, Mariann
中科院分区:
文献类型:
--
作者:
Gammons, Melissa V.;Renko, Miha;Johnson, Christopher M.;Rutherford, Trevor J.;Bienz, Mariann
Extracellular signals are often transduced by dynamic signaling complexes (“signalosomes”) assembled by oligomerizing hub proteins following their recruitment to signal-activated transmembrane receptors. A paradigm is the Wnt signalosome, which is assembled by Dishevelled via reversible head-to-tail polymerization by its DIX domain. Its activity causes stabilization of β-catenin, a Wnt effector with pivotal roles in animal development and cancer. How Wnt triggers signalosome assembly is unknown. Here, we use structural analysis, as well as biophysical and cell-based assays, to show that the DEP domain of Dishevelled undergoes a conformational switch, from monomeric to swapped dimer, to trigger DIX-dependent polymerization and signaling to β-catenin. This occurs in two steps: binding of monomeric DEP to Frizzled followed by DEP domain swapping triggered by its high local concentration upon Wnt-induced recruitment into clathrin-coated pits. DEP domain swapping confers directional bias on signaling, and the dimerization provides cross-linking between Dishevelled polymers, illustrating a key principle underlying signalosome formation. Wnt signalosome assembly by Dishevelled depends on DEP-dependent dimerization DEP dimerization via domain swapping favors unidirectional signaling DEP-dependent cross-linking of Dishevelled polymers triggers phase transition DEP dimerization is mutually exclusive with DEP-dependent binding to Frizzled Gammons et al. discover that Wnt signalosome formation by Dishevelled depends on dimerization by its DEP domain via domain swapping. This cross-links DIX-dependent Dishevelled polymers and, thus, promotes phase transition. They propose that DEP domain swapping triggered by high local concentration of Dishevelled in clathrin-coated pits initiates Wnt signal transduction.
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DOI:
10.1074/jbc.m114.590638
发表时间:
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期刊:
The Journal of biological chemistry
影响因子:
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作者:
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影响因子:
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