A strong correlation has been established between reversible acetylation of histones and transcriptional activation of chromatin. However, the function of histone acetylation remains unknown. We have approached this question by purifying histone acetyltransferase 15,000-fold from yeast and characterizing it enzymatically. Biochemical properties, including the pH and temperature optima and the Michaelis-Menten constants for both acetyl coenzyme A and histones, are similar to those reported for histone acetyltransferases from higher eukaryotes. Yeast histone acetyltransferase has a native molecular weight of 110,000 as determined by gel filtration and is tightly bound to chromatin. It displays high-substrate specificity for histones. It acetylates all four core histones in the order: H4 greater than H2B greater than H2A. 10-fold higher histone acetyltransferase activity is observed for free histones when compared to yeast polynucleosomes as a substrate.
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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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