Abstract
Progression through and completion of mitosis require the actions of the evolutionarily conserved Polo kinase. We have determined that the levels of Cdc5p, a Saccharomyces cerevisiae member of the Polo family of mitotic kinases, are cell cycle regulated. Cdc5p accumulates in the nuclei of G2/M-phase cells, and its levels decline dramatically as cells progress through anaphase and begin telophase. We report that Cdc5p levels are sensitive to mutations in key components of the anaphase-promoting complex (APC). We have determined that Cdc5p-associated kinase activity is restricted to G2/M and that this activity is posttranslationally regulated. These results further link the actions of the APC to the completion of mitosis and suggest possible roles for Cdc5p during progression through and completion of mitosis.
Publication types
-
Research Support, Non-U.S. Gov't
-
Research Support, U.S. Gov't, P.H.S.
MeSH terms
-
Anaphase-Promoting Complex-Cyclosome
-
Cell Cycle / physiology*
-
Cell Cycle Proteins*
-
Cell Nucleus / metabolism
-
Flow Cytometry
-
Fluorescent Antibody Technique
-
Fungal Proteins / metabolism
-
Ligases / physiology
-
Mitosis / physiology
-
Phosphorylation
-
Protein Kinases / metabolism*
-
Protein Processing, Post-Translational / physiology
-
Protein Serine-Threonine Kinases
-
Saccharomyces cerevisiae / enzymology*
-
Saccharomyces cerevisiae Proteins*
-
Transformation, Genetic / genetics
-
Ubiquitin-Protein Ligase Complexes*
-
Ubiquitin-Protein Ligases
Substances
-
Cell Cycle Proteins
-
Fungal Proteins
-
Saccharomyces cerevisiae Proteins
-
Ubiquitin-Protein Ligase Complexes
-
Anaphase-Promoting Complex-Cyclosome
-
Ubiquitin-Protein Ligases
-
Protein Kinases
-
Protein Serine-Threonine Kinases
-
CDC5 protein, S cerevisiae
-
Ligases