Ras-related protein Rab-39B (RAB39B)

Ras-related protein Rab-39B is a member of the RAB family of small GTPases involved in intracellular vesicular trafficking. RAB39B is primarily expressed in the brain and regulates the trafficking of proteins such as glutamate receptor subunits (especially GluA2) and synaptic structure maintenance. Loss-of-function mutations in RAB39B are causally linked to X-linked intellectual disability, Parkinson’s disease, and autism spectrum disorder. RAB39B acts by interacting with effector proteins including PICK1 and modulating both AMPA and NMDA receptor localization, as well as regulating basal autophagy via the PI3K-AKT-mTOR signaling pathway. Research models indicate that targeting RAB39B pathways (e.g., with rapamycin for autophagy) can partially rescue cognitive and synaptic deficits associated with RAB39B deficiency, but direct targeting in humans for therapy remains experimental and is associated with notable neurodevelopmental risks.

Other names

RAB39BBGMRMRX72WSMNWSNXLID72Waisman syndromeras-related protein Rab-39B

Modulation of autophagy via mTOR inhibition