Involved in centrosome duplication and mitotic progression. May be part of a SEM1-containing complex. Localizes on centrosomes in interphase cells and at spindles in mitosis. A single nucleotide deletion in the N-terminal region of the protein leads to production of a shorter protein starting at Met-47 which matches the reference genome (GRCh38/hg38) but is likely to be the minor allele. Belongs to the SAC3 family.