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Arch Microbiol. 2009 Sep;191(9):721-33. doi: 10.1007/s00203-009-0498-3. Epub 2009 Aug 14.

Yeast protein phosphatases Ptp2p and Msg5p are involved in G1-S transition, CLN2 transcription, and vacuole morphogenesis.

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Department of Biotechnology, Graduate School of Engineering, Osaka University, Suita, Osaka 565-0871, Japan.


We previously reported that double disruption of protein phosphatase (PPase) genes PTP2 (phosphotyrosine-specific PPase) and MSG5 (phosphotyrosine and phosphothreonine/serine-PPase) causes Ca(2+) sensitive growth, whereas the single disruptions do not. This finding suggests that Ptp2p and Msg5p are involved in Ca(2+)-induced stress response in a redundant manner. To gain insight into the molecular mechanism causing calcium sensitivity of the ptp2 msg5 double disruptant, we performed fluorescence-activated cell sorting analysis and found a delayed G1 phase. This delayed G1 was consistent with the defect in bud emergence, and reduced CLN2 transcription upon addition of CaCl(2). We also found that Slt2p is hyper-phosphorylated in the Deltaptp2 Deltamsg5 double disruptant and that the vacuole of the Deltaptp2 Deltamsg5 double disruptant is fragmented even in the absence of Ca(2+). These findings suggest that both Ptp2p and Msg5p are involved in the G1 to S transition and vacuole morphogenesis possibly through their regulation of Slt2 pathway.

[Indexed for MEDLINE]

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