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Reference: Zhang A, et al. (2011) Role of Sch9 in regulating Ras-cAMP signal pathway in Saccharomyces cerevisiae. FEBS Lett 585(19):3026-32

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Abstract

In Saccharomyces cerevisiae PKA plays a major role in regulating cell growth, metabolism, and stress resistance. We report that Sch9 regulates PKA directly and SCH9 deletion enhances PKA activity by showing that: (1) Bcy1 predominately localized in the nucleus in glycerol-grown sch9? cells; (2) large part of the catalytic subunits of PKA transferred from the nucleus to the cytoplasm in sch9? cells; (3) higher protein stability of Tpk2 resulted in higher protein level of Tpk2 in sch9? than in wild type cells. Our investigations suggest that Sch9 regulates phosphorylation of Bcy1. We also observed hyper-phosphorylation of Cdc25 in sch9?, in contrast to the tpk2? and tpk2?sch9? mutants, suggesting that feedback inhibition of PKA on Cdc25 is through Tpk2.

Reference Type
Journal Article
Authors
Zhang A, Shen Y, Gao W, Dong J
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