Ras-related protein Rab-39B (Rab39b)

Small GTPases Rab involved in autophagy.

The little GTPases Rab are key regulators of intracellular membrane trafficking, from the formation of transport vesicles to their fusion with membranes.

Rabs cycle between an inactive GDP-bound form and an energetic GTP-bound form that's able to recruit to membranes distinct sets of downstream effectors directly responsible for vesicle formation, movement, tethering and fusion (By similarity). May be involved in vesicular trafficking (PubMed:20159109).