Ras-related protein Rab-3D (RAB3D)

Ras-related protein Rab-3D (RAB3D) is a small GTPase of the Rab family involved in regulating intracellular membrane trafficking, especially in the formation and fusion of secretory vesicles. It is highly expressed in non-neuronal secretory tissues and plays key roles in regulated exocytosis, apical transcytosis, and bone resorption by osteoclasts[1][2][4]. Rab3D acts as a molecular switch cycling between an inactive GDP-bound and active GTP-bound state, modulating cytoskeletal rearrangements, cell motility, and invasiveness. In cancer, Rab3D promotes epithelial–mesenchymal transition (EMT) and tumor metastasis via AKT/GSK‑3β/Snail pathway activation. Functional interaction with calmodulin is required for Rab3D’s role in bone resorption; blockade of this interaction attenuates osteoclast activity. Rab3D is considered a promising therapeutic target for metastatic cancers and bone diseases, though direct pharmacological inhibitors are not currently available[1][2][4].

Other names

Rab3DRAB3DGOVRAB16D2-2RAD3DRab3D upregulated with myeloid differentiationGlioblastoma overexpressedEpididymis secretory sperm binding proteinC130057E11Rik

Drugs that *inhibit the interaction between Rab3D and effectors* (such as calmodulin) may attenuate bone resorption. In cancer, targeting Rab3D could inhibit cell migration and metastasis by disrupting GTPase signaling and the regulated secretory pathway.