Evidence suggests that FZD4 is endocytosed in a clathrin- and AP-2-dependent manner upon stimulation with WNT5A. Direct interactions have been demonstrated between DVL2 and the AP-2 component mu 2 mediated by simultaneous interaction with the DEP domain and a tetrapeptide motif YHEL of DVL2. Mutation of these regions abrogates FZD4 internalization and PCP signaling (Yu et al, 2007; Yu et al, 2010). DVL2 also interacts with beta-arrestin2 (ARBB2) in a PKC-dependent manner, and in vitro phosphorylation of DVL2 by PKC enhances the interaction between DVL2 and ARBB2 as assessed by co-immunoprecipitation (Chen et al, 2003). There is conflicting evidence on the requirement for ARBB2 for the internalization of FZD4 upon WNT5A signaling, however (Chen et al, 2003; Yu et al, 2007).
Chen, W, ten Berge, D, Brown, J, Ahn, S, Hu, LA, Miller, WE, Caron, MG, Barak, LS, Nusse, R, Lefkowitz, RJ
Yu, A, Rual, JF, Tamai, K, Harada, Y, Vidal, M, He, X, Kirchhausen, T
Yu, A, Xing, Y, Harrison, SC, Kirchhausen, T
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