Involved in the regulation and timing of MBF-dependent transcription in late G1 of the cell cycle. Interacts with the ANK repeats of SWI6. The interaction with SWI6 is required for function. Interacts with SIN3. Phosphorylated by CDC28 in a cell cycle-dependent manner, inhibiting the interaction with SWI6. Present with 319 molecules/cell in log phase SD medium.