Together with ARL2, plays a role in the nuclear translocation, retention and transcriptional activity of STAT3. May play a role as an effector of ARL2 (By similarity). Interacts with GTP bound ARL2 and ARL3; the complex ARL2-ARL2BP as well as ARL2BP alone, binds to SLC25A4/ANT1. Interaction with ARL2 may be required for cilia basal body localization (By similarity). Interacts with STAT3; interaction is enhanced with ARL2. Found in a complex with ARL2BP, ARL2 and SLC25A6. Found in a complex with ARL2, ARL2BP and SLC25A4. Interacts with STAT2, STAT3 and STAT4. Detected in the midbody matrix. Not detected in the Golgi, nucleus and on the mitotic spindle. Centrosome-associated throughout the cell cycle. Not detected to interphase microtubules. In retina photoreceptor cells, localized in the distal connecting cilia, basal body, ciliary-associated centriole, and ciliary rootlet. Interaction with ARL2 may be required for cilia basal body localization (By similarity). The complex formed with ARL2BP, ARL2 and SLC25A4 is expressed in mitochondria (By similarity). Ubiquitous with higher expression in brain, especially in hippocampus and cortex. Also expressed in lung, cerebellum, liver, kidney, spleen and heart (at protein level). Belongs to the ARL2BP family.