Component of the nuclear pore complex (NPC) and the spindle pole body (SPB), which plays a key role in de novo assembly and insertion of both structures in the nuclear envelope. Involved in the formation of the bipolar mitotic spindle. Anchors the spindle pole body in the nuclear envelope. Component of the nuclear pore complex (NPC). NPC constitutes the exclusive means of nucleocytoplasmic transport. NPCs allow the passive diffusion of ions and small molecules and the active, nuclear transport receptor-mediated bidirectional transport of macromolecules such as proteins, RNAs, ribonucleoparticles (RNPs), and ribosomal subunits across the nuclear envelope. Due to its 8-fold rotational symmetry, all subunits are present with 8 copies or multiples thereof. Central core structure of the nuclear pore complex. Belongs to the NDC1 family.