Research Overview

The PTD-DBM peptide (Protein-Transduction-Domain–Dishevelled-Binding Motif) is a synthetic cell-penetrating peptide developed as a research tool for modulating Wnt/β-catenin signaling. It fuses a polyarginine protein-transduction domain — which carries the peptide across cell membranes — to a Dishevelled-binding motif that competitively disrupts the interaction between the protein CXXC5 and Dishevelled (Dvl).

Structure and Mechanism

The peptide comprises three parts: a polyarginine cell-penetrating segment, a tetraglycine linker, and the Dishevelled-binding motif (full sequence R₈-GGGG-RKTGHQICKFRKC). CXXC5 functions as a negative-feedback regulator of Wnt/β-catenin signaling by binding Dishevelled; by occupying that protein–protein interface, PTD-DBM relieves the CXXC5-mediated inhibition and allows Wnt signaling to proceed. This competitive-disruption mechanism is the basis for its use as a research tool in tissue-regeneration models.

Research Applications

In published preclinical (rodent) research, PTD-DBM has been investigated for hair-follicle neogenesis and wound-healing models, contexts in which Wnt/β-catenin activation plays a central role. It is used alongside other dermatological-research compounds such as RU-58841 in comparative laboratory work.

Laboratory Handling

PTD-DBM is supplied as a lyophilized powder. The peptide contains two cysteine residues, so the disulfide state (reduced free-thiol versus oxidized) should be noted when characterizing material. The powder is kept sealed, cold, and protected from light and moisture until use. Each batch is third-party tested with a Certificate of Analysis.