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Multiple PPPS/TP motifs act in a combinatorial fashion to transduce Wnt signaling through LRP6. | LitMetric
Binding of Wnt to Frizzled, and either of two members of the low-density-lipoprotein receptor-related protein family, LRP5/6, leads to beta-catenin activation by a poorly understood mechanism. LRP5/6 exhibit five highly conserved PPPS/TP motifs in their intracellular region, among which the first PPPS/TP site is rapidly phosphorylated upon Wnt stimulation. By the use of full-length LRP6 mutants harboring multiple mutations involving the five PPPS/TP motifs, we found that this first PPPS/TP phosphoacceptor site is alone not sufficient or strictly necessary for beta-catenin activation. Instead, we show that each LRP6 PPPS/TP motif contributes in a combinatorial fashion to activate the canonical Wnt-beta-catenin pathway.
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