Description | LRP5 and LRP6 are singlepass transmembrane proteins belonging to the lowdensity lipoprotein receptor (LDLR)related protein family. Unlike other members of the LDLR family, LRP5 and LRP6 have four EGF and three LDLR repeats in the extracellular domain, and prolinerich motifs in the cytoplasmic domain (1). They function as coreceptors for Wnt and are required for the canonical Wnt/betacatenin signaling pathway (2,3). LRP5 and LRP6 are highly homologous and have redundant roles during development (4,5). The activity of LRP5 and LRP6 can be inhibited by the binding of some members of the Dickkopf (DKK) family of proteins (6,7). Upon stimulation with Wnt, LRP6 is phosphorylated at multiple sites including Thr1479, Ser1490, and Thr1493 by kinases |
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