DNA polymerase III from Saccharomyces cerevisiae is analogous to the mammalian DNA polymerase delta by several criteria, including an increased synthetic activity on poly(dA).oligo(dT) (40:1 nucleotide ratio) in the presence of calf thymus proliferating-cell nuclear antigen (PCNA), or cyclin. This stimulation assay has been used to purify the yeast analog of PCNA/cyclin (yPCNA) to homogeneity. yPCNA is a trimer or tetramer (Mr approximately 82,000) of identical subunits with a denatured Mr of 26,000. On a molar basis yPCNA and calf thymus PCNA/cyclin are equally active in stimulating DNA synthesis by DNA polymerase III. About 10 times more yPCNA than calf thymus PCNA/cyclin is needed, however, to stimulate calf thymus DNA polymerase delta, and the degree of stimulation obtained at saturating levels of yPCNA is a factor of 2-3 less than with calf thymus PCNA/cyclin. Both stimulatory proteins exert their effect in an identical fashion, i.e., by increasing the processivity of the DNA polymerase. Yeast DNA polymerases I and II and calf thymus DNA polymerase alpha are not stimulated by yPCNA. Treatment of logarithmic-phase cells with hydroxyurea blocks them in the S phase and produces a 4- to 5-fold increase in yPCNA.
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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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