D. Cdc5's polo-box domain (PBD) binds to Ime2. Ha3-tagged versions of the wild-type PBD or the phosphopeptide-binding mutant PBD-FAA were expressed at t = 5.5 h in SPM in cells depleted of Cdc20 and Cdc5. PBD-ha3 and Ime2 were detected by immunoblotting in whole-cell extracts and α-Ha immunoprecipitates. Data information: data are representative of two independent experiments. 