Earlier work indicates that the major DNA repair phosphodiesterase (PDE) in yeast cells is the well-characterized Apn1 protein. Apn1 demonstrates both Mg2+-independent PDE activity and Mg2+-independent class II apurinic/apyrimidinic (AP) endonuclease activity and represents greater than 90% of the activity detected in crude extracts from wild-type yeast cells. Apn1 is related to Echerichia coli endonuclease IV, both in its enzymatic properties and its amino acid sequence. In this work, we report the partial purification of a novel yeast protein, Pde1, present in Apn1-deficient cells. Pde1 is purified by sequential BioRex-70, PBE118, and MonoS chromatography steps using a sensitive and highly specific 3'-phosphoglycolate-terminated oligonucleotide-based assay as a measure of PDE activity. Mg2+-stimulated PDE and Mg2+-stimulated class II AP endonuclease copurify during this procedure. These results indicate that yeast, like many other organisms studied to date, has enzymatic redundancy for the repair of 3'-blocking groups and abasic sites.
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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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