Required for the proper coordination between exit from mitosis and the initiation of septation. Has a role in bipolar spindle formation during spindle pole body (SPB) duplication. Required for the localization of sad1 to the SPB (PubMed:12857865). Component of the spindle pole body (SPB), acting as the connector of microtubule arrays in the cytoplasm and the nucleoplasm, is involved in nuclear positioning before chromosome segregation, SPB separation, spindle formation, chromosome segregation, nuclear migration into the bud, nuclear reorientation after cytokinesis and nuclear fusion during conjugation. The SPB half-bridge, which is tightly associated with the cytoplasmic side of the nuclear envelope and the SPB, is playing a key role as the starting structure for and in the initiation of SPB duplication in G1 (PubMed:12857865). Within the complex, interacts with sad1 (PubMed:12857865). Associates with the half-bridge structure of the SPB. Belongs to the centrin family.