Title: YPI1 and SDS22 proteins regulate the nuclear localization and function of yeast type 1 phosphatase Glc7
Authors: Pedelini, Leda ×
Marquina, Maribel
Arino, Joaquin
Casamayor, Antonio
Sanz, Libia
Bollen, Mathieu
Sanz, Pascual
Garcia-Gimeno, Maria Adelaida #
Issue Date: Feb-2007
Publisher: Amer soc biochemistry molecular biology inc
Series Title: Journal of Biological Chemistry vol:282 issue:5 pages:3282-3292
Abstract: We have recently characterized Ypi1 as an inhibitory subunit of yeast Glc7 PP1 protein phosphatase. In this work we demonstrate that Ypi1 forms a complex with Glc7 and Sds22, another Glc7 regulatory subunit that targets the phosphatase to substrates involved in cell cycle control. Interestingly, the combination of equimolar amounts of Ypi1 and Sds22 leads to an almost full inhibition of Glc7 activity. Because YPI1 is an essential gene, we have constructed conditional mutants that demonstrate that depletion of Ypi1 leads to alteration of nuclear localization of Glc7 and cell growth arrest in mid-mitosis with aberrant mitotic spindle. These phenotypes mimic those produced upon inactivation of Sds22. The fact that progressive depletion of either Ypi1 or Sds22 resulted in similar physiological phenotypes and that both proteins inhibit the phosphatase activity of Glc7 strongly suggest a common role of these two proteins in regulating Glc7 nuclear localization and function.
ISSN: 0021-9258
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Laboratory of Biosignaling & Therapeutics
× corresponding author
# (joint) last author

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