Cytoskeletal linker protein, which is essential for attachment of the centrosome to the nucleus. Required for dynein localization to the nuclear envelope (By similarity). Homodimer. Interacts with the dynein subunit dli-1 via its N-terminus. May interact with microtubules (By similarity). Localizes to the minus end of microtubules, proximal to the centrosome. Centrosomal localization requires sun-1 and microtubules. The large coiled coil domain is required for homodimerization. Belongs to the hook family.