Component of the BBSome complex (By similarity). The BBSome complex is thought to function as a coat complex required for sorting of specific membrane proteins to the primary cilia (By similarity). The BBSome complex is required for ciliogenesis but is dispensable for centriolar satellite function (By similarity). Required for proper BBSome complex assembly and its ciliary localization (PubMed:22922713). Required for cilia biogenesis and both the assembly and movement of intraflagellar transport proteins along the ciliary axoneme (PubMed:22022287, PubMed:22922713). In ciliated sensory neurons, required for the sensation of nitric oxide and avoidance of NO-producing organisms like P.aeruginosa (PubMed:30014846). Part of BBSome complex, that contains bbs-1, bbs-2, bbs-4, bbs-5, osm-12, bbs-8/ttc-8 and bbs-9 (By similarity). Interacts with bbs-1 (PubMed:22922713). Mutants have normal body morphology, but with reduced body length and width, delayed larval development and decreased roaming movements (PubMed:22022287). Defective cilia structure and function characterized by an increased accumulation and mislocalization of intraflagellar transport proteins and impaired movement of intraflagellar transport proteins along the ciliary axoneme (PubMed:22922713). Disrupted assembly of the BBSome complex at the base of the cilia (PubMed:22922713). Defective avoidance of nitric oxide and P.aeruginosa (PubMed:30014846).