Cdc13 is an essential protein from Saccharomyces cerevisiae that caps telomeres by protecting the C-rich telomeric DNA strand from degradation and facilitates telomeric DNA replication by telomerase. In vitro, Cdc13 binds TG-rich single-stranded telomeric DNA with high affinity and specificity. A previously identified domain of Cdc13 encompassing amino acids 451-694 (the 451-694 DBD) retains the single-stranded DNA-binding properties of the full-length protein; however, this domain contains a large unfolded region identified in heteronuclear NMR experiments. Trypsin digestion and MALDI mass spectrometry were used to identify the minimal DNA-binding domain (the 497-694 DBD) necessary and sufficient for full DNA-binding activity. This domain was completely folded, and the N-terminal unfolded region removed was shown to be dispensable for function. Using affinity photocrosslinking to site-specifically modified telomeric single-stranded DNA, the 497-694 DBD was shown to contact the entire 11mer required for high-affinity binding. Intriguingly, both domains bound single-stranded telomeric DNA with much greater affinity than the full-length protein. The full-length protein exhibited the same rate of dissociation as both domains, however, indicating that the full-length protein contains a region that inhibits association with single-stranded telomeric DNA.
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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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