The Saccharomyces cerevisiae SIS2 gene was identified by its ability, when present on a high copy number plasmid, to increase dramatically the growth rate of sit4 mutants. SIT4 encodes a type 2A-related protein phosphatase that is required in late G1 for normal G1 cyclin expression and for bud initiation. Overexpression of SIS2, which contains an extremely acidic carboxyl terminal region, stimulated the rate of CLN1, CLN2, SWI4 and CLB5 expression in sit4 mutants. Also, overexpression of SIS2 in a CLN1 cln2 cln3 strain stimulated the growth rate and the rate of CLN1 and CLB5 RNA accumulation during late G1. The SIS2 protein fractionated with nuclei and was released from the nuclear fraction by treatment with either DNase I or micrococcal nuclease, but not by RNase A. This result, combined with the finding that overexpression of SIS2 is extremely to a strain containing lower than normal levels of histones H2A and H2B, suggests that SIS2 might function to stimulate transcription via an interaction with chromatin.
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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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