Required for centriole duplication likely through its interaction with Sas-6 (PubMed:29892014, PubMed:33704067). During embryogenesis, maternally provided protein is required for centrosome duplication and nuclear division cycles of the syncytial embryos (PubMed:29892014). In femoral chordotonal organs, required for sensory cilia structural integrity and functionality necessary for motor coordination (PubMed:29892014). In male germline, has a role in cytokinesis which seems dependent on its localization to the Golgi (PubMed:29892014). Homodimer (via C-terminus); dimerization appears to be required for its trans-Golgi localization but not for its function and centriolar localization (PubMed:33704067). Interacts (via C-terminus) with Rab6; binds Rab6 as a homodimer, this interaction seems to be required for trans-Golgi localization (PubMed:33704067). Interacts (via C-terminus) with Sas-6; binds as a monomer to a Sas-6 homodimer (PubMed:29892014, PubMed:33704067). Co-localizes with the centriole in interphase and mitosis (PubMed:29892014). Mostly found in the Golgi, with a small amount detected in centrosomes (PubMed:29892014, PubMed:33704067). In spermatocytes, localizes to the trans-Golgi and inside the Golgi cisternae (PubMed:33704067). Viable (PubMed:29892014). Loss of daughter centrioles and asymmetrical mother centriole-derived basal body results in defective nine-fold symmetry of cilia in neurosensory organs and therefore motor coordination defects (PubMed:29892014, PubMed:33704067). Plp-associated structures are also disorganized but ciliary structures are still present in the scolopale rods (PubMed:29892014). Males are fertile, whereas female are sterile (PubMed:29892014). Results in failure to duplicate centrosomes in embryos and diploid larval tissues (PubMed:29892014). Belongs to the GORAB family.