The BBSome complex is thought to function as a coat complex required for sorting of specific membrane proteins to the primary cilia. The BBSome complex is required for ciliogenesis but is dispensable for centriolar satellite function. This ciliogenic function is mediated in part by the Rab8 GDP/GTP exchange factor, which localizes to the basal body and contacts the BBSome. Rab8(GTP) enters the primary cilium and promotes extension of the ciliary membrane. Firstly the BBSome associates with the ciliary membrane and binds to RAB3IP/Rabin8, the guanosyl exchange factor (GEF) for Rab8 and then the Rab8-GTP localizes to the cilium and promotes docking and fusion of carrier vesicles to the base of the ciliary membrane. The BBSome complex, together with the LTZL1, controls SMO ciliary trafficking and contributes to the sonic hedgehog (SHH) pathway regulation. Required for proper BBSome complex assembly (By similarity). Plays a role in olfactory cilium biogenesis/maintenance and trafficking and is essential for the localization of the BBSome complex in the olfactory sensory neurons cilia (PubMed:15322545, PubMed:28237838). Part of BBSome complex, that contains BBS1, BBS2, BBS4, BBS5, BBS7, BBS8/TTC8, BBS9 and BBIP10. Interacts with the C-terminus of RAB3IP. Interacts with CCDC28B and ALDOB. Interacts with PKD1. Mice are anosmic (inability to perceive odors) and have defective olfactory cilia. Significant reduction in olfactory sensory neurons ciliation in the olfactory epithelium with decreased cilium length and number. Impaired cilium localization of the BBSome complex.