Summary
A cal1-1 mutant of the yeast Saccharomyces cerevisiae showing Ca2+-dependent growth was isolated. Its growth continued exponentially in Ca2+-rich medium, but stopped in Ca2+-poor medium at 37°C. Mg2+ ions could not replace Ca2+ ions. In Ca2+-poor medium, the mutant cells stopped growing homogeneously at the stage of cell division cycle with a tiny bud. The nucleus in these arrested cells was in the G2 stage, judging from observation after nuclear staining and determination of the DNA content. Trifluoperazine-dependent pseudorevertants, which could grow in the presence of 20 μM to 80 μM trifluoperazine in Ca2+-poor medium at 37°C, were obtained from this cal1-1 mutant. The suppressor mutation, tfrl, itself conferred trifluoperazine resistance. Other calmodulin inhibitors structurally unrelated to trifluoperazine had similar effects to trifluoperazine on these pseudorevertants. These results suggest that Ca2+ ions and a calmodulin play important roles in the yeast cell division cycle at the stage of bud growth and nuclear division.
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Abbreviations
- Tfp:
-
trifluoperazine
- DAP1:
-
4′6-diamidino-2-phenylindole
- EMS:
-
ethyl methanesulfonate
- PD:
-
parental ditype
- NPD:
-
nonparental ditype
- T:
-
tetratype
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Ohya, Y., Ohsumi, Y. & Anraku, Y. Genetic study of the role of calcium ions in the cell division cycle of Saccharomyces cerevisiae: A calcium-dependent mutant and its trifluoperazine-dependent pseudorevertants. Molec. Gen. Genet. 193, 389–394 (1984). https://doi.org/10.1007/BF00382073
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DOI: https://doi.org/10.1007/BF00382073