Rab3 GTPase-activating protein catalytic subunit (RAB3GAP1)

Probable catalytic subunit of a GTPase activating protein which has specificity for Rab3 subfamily (RAB3A, RAB3B, RAB3C and RAB3D). Rab3 proteins are involved in regulated exocytosis of neurotransmitters and hormones.

Specifically converts active Rab3-GTP to the inactive form Rab3-GDP. Required for normal eye and brain development.