We have carried out a domain analysis of POL32, the third subunit of Saccharomyces cerevisiae DNA polymerase delta (Pol delta). Interactions with POL31, the second subunit of Pol delta, are specified by the amino-terminal 92 amino acids, whereas interactions with the replication clamp proliferating cell nuclear antigen (PCNA, POL30) reside at the extreme carboxyl-terminal region. Pol32 binding, in vivo and in vitro, to the large subunit of DNA polymerase alpha, POL1, requires the carboxyl-proximal region of Pol32. The amino-terminal region of Pol32 is essential for damage-induced mutagenesis. However, the presence of its carboxyl-terminal PCNA-binding domain enhances the efficiency of mutagenesis, particularly at high loads of DNA damage. In vitro, in the absence of effector DNA, the PCNA-binding domain of Pol32 is essential for PCNA-Pol delta interactions. However, this domain has minimal importance for processive DNA synthesis by the ternary DNA-PCNA-Pol delta complex. Rather, processivity is determined by PCNA-binding domains located in the Pol3 and/or Pol31 subunits. Using diagnostic PCNA mutants, we show that during DNA synthesis the carboxyl-terminal domain of Pol32 interacts with the carboxyl-terminal region of PCNA, whereas interactions of the other subunit(s) of Pol delta localize largely to a hydrophobic pocket at the interdomain connector loop region of PCNA.
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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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