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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Glc8 is a glucose-repressible activator of Glc7 protein phosphatase-1.

Regulation of Glc7 type 1 protein phosphatase stability and activity was studied in budding yeast. We found that the Glc7 protein has a half-life of over 180min, which is sufficient for several generations. Glc7 protein stability was constant during the cell cycle and in batch culture growth. Furthermore, deletion of regulatory subunit Gac1, Reg1, Reg2, Sds22, or Glc8 had no influence on Glc7 protein half-life. The activity of Glc7 assayed as okadaic acid-resistant phosphorylase phosphatase activity was constant during the cell cycle. Deletion of the aforementioned regulatory subunits revealed that only Glc8 deletion had a significant effect in reducing Glc7 activity. Glc7 activity was induced during stationary phase in a Glc8-dependent manner. In addition, extracellular glucose repressed the induction of Glc7 activity. These results are consistent with glucose repression of Glc8 expression and favor the role of Glc8 as a major Glc7 activator.[1]


  1. Glc8 is a glucose-repressible activator of Glc7 protein phosphatase-1. Nigavekar, S.S., Tan, Y.S., Cannon, J.F. Arch. Biochem. Biophys. (2002) [Pubmed]
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