Controls nuclear migration. NUM1 specifically controls the interaction of the bud neck cytoskeleton with the pre-divisional G2 nucleus. Functions in dynein-anchoring. During late anaphase forms dynein-interacting cortical microtubule capture sites at both cellular poles. This leads to dynein-dependent sliding of the microtubules in the bud. Interacts with PAC11 when DYN1 is present, and TUB3. Additional regions of lower homology to the repeat consensus (always starting with proline) are found in both flanking domains of the tandem repeats.