The chromatin structure of two tandemly linked acid phosphatase genes (PHO5 and PHO3) from Saccharomyces cerevisiae was analyzed under conditions at which the strongly regulated PHO5 gene is repressed. Digestion experiments with DNase I, DNase II, micrococcal nuclease and restriction nucleases reveal the presence of five hypersensitive sites at the PHO5/PHO3 locus, two of them upstream of PHO5 at distances of 920 and 370 bp, one in between the two genes and two downstream of PHO3. Specifically positioned nucleosomes are located next to these hypersensitive sites as shown by indirect end-labeling experiments. The positions deduced from these experiments could be verified by monitoring the accessibility of various restriction sites to the respective nucleases. Sites within putative linker regions were about 50-60% susceptible, whereas sites located within nucleosome cores were resistant. Hybridizing micrococcal nuclease digests to a probe from in between the two upstream hypersensitive sites leads to an interruption of an otherwise regular nucleosomal DNA pattern. This shows directly that these hypersensitive sites represent gaps within ordered nucleosomal arrays.
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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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