Ras-related protein Rab-18 (RAB18)

Ras-related protein Rab-18 (RAB18) is a member of the Rab family of small GTPases, which act as molecular switches in membrane trafficking by cycling between active (GTP-bound) and inactive (GDP-bound) states[1][4][6][8]. Rab-18 is ubiquitously expressed, with high expression in neural tissues, and localizes to the endoplasmic reticulum, lipid droplets, Golgi complex, and secretory granules across various cell types[5][6][4]. Its primary cellular functions are regulation of vesicle trafficking, lipid droplet formation, autophagy, and organelle tethering, especially linking lipid droplets to the endoplasmic reticulum for lipid transfer and metabolism[4][3]. Rab-18 activity is finely regulated by guanine nucleotide exchange factors (GEFs), including the Rab3GAP complex, and GTPase-activating proteins (GAPs) such as TBC1D20[2][6]. Mutations disrupting RAB18 function cause Warburg Micro syndrome, a severe developmental disorder characterized by intellectual disability, eye abnormalities (including cataracts), and endocrine dysfunctions related to sexual development[1][4][6]. The precise molecular mechanisms and therapeutic opportunities for Rab-18 are still being elucidated, and its broad role in trafficking and metabolism makes it a significant potential target for disease research[4][6].

Other names

RAB18RAB18LI1WARBM3ras-related protein Rab-18RAB18 small GTPaseras-related protein Rab-18 isoform 1ras-related protein Rab-18 isoform 2member RAS oncogene family

Drugs or molecules targeting Rab-18 would be expected to modulate its GTPase activity or interfere with its role in vesicle trafficking, lipid droplet metabolism, or autophagy. Specific drugs are not reported in search results.