The requirement of Cdc2 in SAC maintenance was revealed by use of the cdc2-asM17 mutant. The requirement of Cdc2 in SAC maintenance was revealed by use.

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The requirement of Cdc2 in SAC maintenance was revealed by use of the cdc2-asM17 mutant. The requirement of Cdc2 in SAC maintenance was revealed by use of the cdc2-asM17 mutant. (a) The original cdc2-as mutant (as) was sensitive to a low dose of the microtubule drug MBC (10 µg ml−1), whereas the revived mutant cdc2-asM17 (asM17) was not. This enabled use of the analogue-sensitive cdc2 mutant in the presence of MBC. (b) The cdc2-asM17 mutant was used in combination with MBC treatment. cdc2-asM17 cells were treated with MBC to arrest cells at metaphase without spindles. Cells with Mad2-GFP dots at kinetochores were chosen for filming. After 1NM-PP1 addition (t = 0 min), Mad2-GFP dots disappeared within 4 min. DMSO was added as negative control. Mis6-2mRFP, a kinetochore marker; Sid4-2ECFP, an SPB marker. (c) The cdc2-asM17 mutation was combined with the β-tubulin ts mutation nda3/alp12–1828. Cells were arrested at metaphase at 36°C. Filming was done similarly to (b). After 1NM-PP1 addition (t = 0 min), Mad2-GFP dots disappeared within 3 min. DMSO was added as negative control. Scale bars, 2 µm. (d) Duration of Mad2-GFP dots residence at kinetochores after addition of DMSO or 1NM-PP1 in (b,c) was measured. Yuki Aoi et al. Open Biol. 2014;4:140063