Mcm10 is a conserved eukaryotic DNA replication factor that is required for S phase progression. Recently, Mcm10 has been shown to interact physically with the DNA polymerase-alpha (pol-alpha).primase complex. We show now that Mcm10 is in a complex with pol-alpha throughout the cell cycle. In temperature-sensitive mcm10-1 mutants, depletion of Mcm10 results in degradation of the catalytic subunit of pol-alpha, Cdc17/Pol1, regardless of whether cells are in G(1), S, or G(2) phase. Importantly, Cdc17 protein levels can be restored upon overexpression of exogenous Mcm10 in mcm10-1 mutants that are grown at the nonpermissive temperature. Moreover, overexpressed Cdc17 that is normally subject to rapid degradation is stabilized by Mcm10 co-overexpression but not by co-overexpression of the B-subunit of pol-alpha, Pol12. These results are consistent with Mcm10 having a role as a nuclear chaperone for Cdc17. Mutational analysis indicates that a conserved heat-shock protein 10 (Hsp10)-like domain in Mcm10 is required to prevent the degradation of Cdc17. Substitution of a single residue in the Hsp10-like domain of endogenous Mcm10 results in a dramatic reduction of steady-state Cdc17 levels. The high degree of evolutionary conservation of this domain implies that stabilizing Cdc17 may be a conserved function of Mcm10.
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Evidence ID | Analyze ID | Gene/Complex | Systematic Name/Complex Accession | Qualifier | Gene Ontology Term ID | Gene Ontology Term | Aspect | Annotation Extension | Evidence | Method | Source | Assigned On | Reference |
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Evidence ID | Analyze ID | Gene | Gene Systematic Name | Phenotype | Experiment Type | Experiment Type Category | Mutant Information | Strain Background | Chemical | Details | Reference |
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Evidence ID | Analyze ID | Gene | Gene Systematic Name | Disease Ontology Term | Disease Ontology Term ID | Qualifier | Evidence | Method | Source | Assigned On | Reference |
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Evidence ID | Analyze ID | Regulator | Regulator Systematic Name | Target | Target Systematic Name | Direction | Regulation of | Happens During | Regulator Type | Direction | Regulation Of | Happens During | Method | Evidence | Strain Background | Reference |
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Site | Modification | Modifier | Source | Reference |
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Evidence ID | Analyze ID | Interactor | Interactor Systematic Name | Interactor | Interactor Systematic Name | Allele | Assay | Annotation | Action | Phenotype | SGA score | P-value | Source | Reference | Note |
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Evidence ID | Analyze ID | Interactor | Interactor Systematic Name | Interactor | Interactor Systematic Name | Assay | Annotation | Action | Modification | Source | Reference | Note |
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Complement ID | Locus ID | Gene | Species | Gene ID | Strain background | Direction | Details | Source | Reference |
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Evidence ID | Analyze ID | Dataset | Description | Keywords | Number of Conditions | Reference |
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