Dishevelled segment polarity protein PDZ domain (Dvl PDZ)

The Dishevelled (Dvl) PDZ domain is a critical protein-protein interaction hub within the Wnt/beta-catenin signaling pathway, serving as a scaffold for various regulatory proteins (UniProt O14640). CXXC-type zinc finger protein 5 (CXXC5) acts as a negative regulator of this pathway by binding specifically to the Dvl PDZ domain, thereby inhibiting the downstream signaling cascade required for tissue regeneration and cell differentiation (Kim et al., 2016, Nature Communications). Therapeutic strategies targeting the CXXC5–Dvl interface aim to disrupt this interaction using small molecules or peptides, effectively releasing the brake on Wnt signaling. This approach has shown significant promise in preclinical models for promoting bone formation in osteoporosis, stimulating hair regrowth in alopecia, and accelerating skin wound healing (Lee et al., 2017, Journal of Investigative Dermatology). Small molecules like KY19382 and peptides like PTD-DBM have been developed to specifically interfere with this interface, leading to increased nuclear beta-catenin levels and activation of Wnt-responsive genes. However, because the Wnt pathway is frequently dysregulated in various cancers, precise control over the activation of this target is essential to mitigate the risk of tumorigenesis and other systemic safety concerns (PubMed: 27273568). The development of topical or localized delivery systems is a primary strategy to ensure therapeutic efficacy while minimizing potential off-target effects.

Other names

DSH PDZDvl PDZ domainDishevelled-1 PDZDishevelled-2 PDZDishevelled-3 PDZCXXC5-Dvl interface

Inhibition of the protein-protein interaction between CXXC5 and the Dishevelled PDZ domain, which prevents the negative regulation of the Wnt/beta-catenin signaling pathway and promotes the stabilization of beta-catenin.