Essential component of the mitotic checkpoint, which prevents cells from prematurely exiting mitosis. Required for the assembly of the dynein-dynactin and MAD1-MAD2 complexes onto kinetochores. Involved in regulation of membrane traffic between the Golgi and the endoplasmic reticulum (By similarity).
Subcellular locations: Cytoplasm, Endoplasmic reticulum membrane, Chromosome, Centromere, Kinetochore, Cytoplasm, Cytoskeleton, Spindle, Lipid droplet
Dynamic pattern of localization during the cell cycle. In most cells at interphase, present diffusely in the cytoplasm. In prometaphase, associated with the kinetochore. At metaphase, detected both at the kinetochores and, most prominently, at the spindle, particularly at the spindle poles. In very early anaphase, detected on segregating kinetochores. In late anaphase and telophase, accumulates at the spindle midzone.