Ras-related protein Rab-38 (RAB38)

Ras-related protein Rab-38 (RAB38) is a member of the Rab subfamily of small GTPases and plays a critical role in vesicle-mediated trafficking, particularly from endosomes to melanosomes and in the assembly of melanosomes—specialized organelles involved in pigment production. RAB38 is predominantly expressed in melanocytes and retinal pigment epithelial cells, where it controls the sorting and transport of enzymes such as tyrosinase-related protein 1 (TYRP1) into melanosomes. Deficiency or mutations in RAB38 disrupt melanosome targeting of these enzymes, resulting in pigmentation disorders such as oculocutaneous albinism and in mouse models, altered coat color ("chocolate" phenotype). RAB38 also contributes to phagosome acidification and maturation, impacting immune response to pathogens. It acts as a GTP-dependent molecular switch to recruit effectors for vesicle formation, tethering, and fusion in subcellular compartments. RAB38 is not currently a direct therapeutic target for approved drugs, but its molecular roles in cell trafficking and disease associations make it important in research on pigmentation, lysosome-related organelles, and vesicular transport.

Other names

RAB38NY-MEL-1Melanoma antigen NY-MEL-1rrGTPbpRab-related GTP-binding protein

Not applicable (no drugs documented, but theoretically, small molecule inhibitors or biotechnological approaches could affect GTP binding/hydrolysis or vesicle trafficking for research purposes.)