The silent information regulator protein 3 (Sir3p) functions in the initiation, propagation, and maintenance of transcriptionally silenced chromatin in Saccharomyces cerevisiae. To better understand the physicochemical basis for its effects on chromatin architecture, recombinant full-length S. cerevisiae Sir3p has been purified to near homogeneity on the large-scale and characterized by circular dichroism, limited protease digestion, and analytical ultracentrifugation. Results indicate that the Sir3p monomer has a unique tripartite domain organization, including a nearly 300-amino-acid residue stretch of intrinsically disordered residues that lies internal to its structured N- and C-terminal regions. Sir3p self-associates extensively in moderate salt and at micromolar protein concentrations producing a broad range of oligomers that sediment from 8 to in excess of 85 S. These results provide new insight into Sir3p domain organization and quaternary structure and support a nucleosome bridging model for Sir3p-dependent regulation of chromatin architecture.
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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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