The crystal structure of the human p300 histone acetyltransferase (HAT) domain reveals a familiar alpha + beta fold with unique structural elaborations that merit its classification as a third divergent HAT branch alongside the GCN5-related N-acetyltransferase (GNAT) and MYST (MOZ, Ybf2/Sas3, Sas2, Tip60) families. Two key departures from the core GNAT/MYST HAT fold--a long unstructured chain (or "flap") overlaying the acetyl-CoA (AcCoA) binding groove, and a four-alpha-helix "tower" excursion from the main beta-sheet--critically contribute to the recognition and presumptive catalytic machinery of p300/CBP HAT enzymes. Kinetic and mutant analysis of this enlarged residue constellation in p300 (which is distinct from functional fingerprints drawn from GNAT or MYST complexes) led Liu et al., to suggest that p300/CBP works with an unorthodox "hit and run" mechanism that enlists Tyr1467 as the critical catalytic residue. In order to extend the evolutionary testbed for this variant HAT mechanism beyond the thin roll of p300/CBP orthologs, I propose that Rtt109, a novel yeast HAT that has so far eluded classification, is the prototype of a fungal clan of p300-related enzymes that preserve the embellished HAT fold, but further diversify its catalytic options.
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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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