The formation of triple helical DNA has been evoked in several cellular processes including transcription, replication, and recombination. Using conventional and affinity chromatography, we purified from Saccharomyces cerevisiae whole-cell extract a 35-kDa protein that avidly and specifically bound a purine motif triplex (with a K(d) of 61 pM) but not a pyrimidine motif triplex or duplex DNA. Peptide microsequencing identified this protein as the product of the STM1 gene. Confirmation that Stm1p is a purine motif triplex-binding protein was obtained by electrophoretic mobility shift assays using either bacterially expressed, recombinant Stm1p or whole-cell extracts from stm1Delta yeast. Stm1p has previously been identified as G4p2, a G-quartet nucleic acid-binding protein. This suggests that some proteins actually recognize features shared by G4 DNA and purine motif triplexes, e.g. Hoogsteen hydrogen-bonded guanines. Genetically, the STM1 gene has been identified as a multicopy suppressor of mutations in several genes involved in mitosis (e.g. TOM1, MPT5, and POP2). A possible role for multiplex DNA and its binding proteins in mitosis is discussed.
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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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