Core component of the 3M complex, a complex required to regulate microtubule dynamics and genome integrity. It is unclear how the 3M complex regulates microtubules, it could act by controlling the level of a microtubule stabilizer (PubMed:24793695, PubMed:24793696). Acts as a regulator of the Cul7-RING(FBXW8) ubiquitin-protein ligase, playing a critical role in the ubiquitin ligase pathway that regulates Golgi morphogenesis and dendrite patterning in brain. Required to localize CUL7 to the Golgi apparatus in neurons. {ECO:0000269|PubMed:21572988, ECO:0000269|PubMed:24793695, ECO:0000269|PubMed:24793696}. This is the function of Ensembl gene identifier ENSG00000124006 (OBSL1, obscurin like cytoskeletal adaptor 1).