PCNA plays critical roles in DNA replication and various DNA repair pathways including DNA damage tolerance (DDT). In budding yeast Saccharomyces cerevisiae, DDT (aka DNA postreplication repair, PRR) is achieved by sequential ubiquitination of PCNA encoded by POL30. Our previous studies revealed that two Arabidopsis PCNA genes were able to complement the essential function of POL30 in budding yeast, but failed to rescue the PRR activity. Here we hypothesize that a certain amino acid variation(s) is responsible for the difference, and identified K196 as a critical residue for the PRR activity. It was found that the pol30-K196V mutation abolishes Rad18 interaction and PRR activity, whereas nearby amino acid substitutions can partially restore Rad18 interaction and PRR activity. Together with the Pol30-Ub fusion data, we believe that we have identified a putative Rad18-binding pocket in Pol30 that is required for PCNA monoubiquitination and PRR.
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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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| Evidence ID | Analyze ID | File | Description |
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