The small 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 active GTP-bound form that is able to recruit to membranes different set of downstream effectors directly responsible for vesicle formation, movement, tethering and fusion. Required for the integrity and for normal function of the Golgi apparatus and the trans-Golgi network. Plays a role in insulin-stimulated translocation of GLUT4 to the cell membrane. Plays a role in M6PR transport from the trans-Golgi network to endosomes. Plays a role in the internalization of EGFR from the cell membrane into endosomes. Plays a role in the maturation of phagosomes that engulf pathogens, such as S.aureus and M.tuberculosis. Interacts with OCRL. Interacts with NGFR (By similarity). Interacts (in GDP-bound form) with RIN3 and GAPVD1, which function as guanine exchange factors (GEF). Interacts (in GTP-bound form) with EEA1. Interacts with EGFR. Interacts (in GTP-bound form) with APPL2; interaction contributes to or enhances recruitment of APPL2 to the phagosomes; interaction enhances Fc-gamma receptor-mediated phagocytosis through PI3K/Akt signaling in macrophages (By similarity). Rapidly recruited to phagosomes containing S.aureus or M.tuberculosis (PubMed:21255211). Highest expression in placenta and brain with lower levels in heart and lung. Not detected in liver, skeletal muscle, kidney or pancreas. Belongs to the small GTPase superfamily. Rab family. Extended N-terminus. Extended N-terminus.