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Budding yeast centrosome duplication requires stabilization of Spc29 via Mps1-mediated phosphorylation.
- Source :
-
The Journal of biological chemistry [J Biol Chem] 2009 May 08; Vol. 284 (19), pp. 12949-55. Date of Electronic Publication: 2009 Mar 05. - Publication Year :
- 2009
-
Abstract
- Protein phosphorylation plays an important role in the regulation of centrosome duplication. In budding yeast, numerous lines of evidence suggest a requirement for multiple phosphorylation events on individual components of the centrosome to ensure their proper assembly and function. Here, we report the first example of a single phosphorylation event on a component of the yeast centrosome, or spindle pole body (SPB), that is required for SPB duplication and cell viability. This phosphorylation event is on the essential SPB component Spc29 at a conserved Thr residue, Thr(240). Mutation of Thr(240) to Ala is lethal at normal gene dosage, but an increased copy number of this mutant allele results in a conditional phenotype. Phosphorylation of Thr(240) was found to promote the stability of the protein in vivo and is catalyzed in vitro by the Mps1 kinase. Furthermore, the stability of newly synthesized Spc29 is reduced in a mutant strain with reduced Mps1 kinase activity. These results demonstrate the first evidence for a single phosphorylation event on an SPB component that is absolutely required for SPB duplication and suggest that the Mps1 kinase is responsible for this protein-stabilizing phosphorylation.
- Subjects :
- Cell Cycle
Cell Survival
Fluorescent Antibody Technique, Indirect
Immunoblotting
Microtubule-Associated Proteins genetics
Mutation genetics
Phosphorylation
Protein Serine-Threonine Kinases genetics
Saccharomyces cerevisiae Proteins genetics
Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization
Centrosome physiology
Microtubule-Associated Proteins metabolism
Protein Serine-Threonine Kinases metabolism
Saccharomyces cerevisiae physiology
Saccharomyces cerevisiae Proteins metabolism
Spindle Apparatus
Subjects
Details
- Language :
- English
- ISSN :
- 0021-9258
- Volume :
- 284
- Issue :
- 19
- Database :
- MEDLINE
- Journal :
- The Journal of biological chemistry
- Publication Type :
- Academic Journal
- Accession number :
- 19269975
- Full Text :
- https://doi.org/10.1074/jbc.M900088200