Functional Antagonism between Sas3 and Gcn5 Acetyltransferases and ISWI Chromatin Remodelers
Functional Antagonism between Sas3 and Gcn5 Acetyltransferases and ISWI Chromatin Remodelers
Chromatin-modifying enzymes and ATP-dependent remodeling complexes have been intensely studied individually, yet how these activities are coordinated to ensure essential cell functions such as transcription, replication, and repair of damage is not well understood. In this study, we show that the critical loss of Sas3 and Gcn5 acetyltransferases in yeast can be functionally rescued by inactivation of ISWI remodelers. This genetic interaction depends on the ATPase activities of Isw1 and Isw2, suggesting that it involves chromatin remodeling activities driven by the enzymes. Genetic dissection of the Isw1 complexes reveals that the antagonistic effects are mediated specifically by the Isw1a complex. Loss of Sas3 and Gcn5 correlates with defective RNA polymerase II (RNAPII) occupancy at actively transcribed genes, as well as a significant loss of H3K14 acetylation. Inactivation of the Isw1a complex in the acetyltransferase mutants restores RNAPII recruitment at active genes, indicating that transcriptional regulation may be the mechanism underlying suppression. Dosage studies and further genetic dissection reveal that the Isw1b complex may act in suppression through down-regulation of Isw1a. These studies highlight the importance of balanced chromatin modifying and remodeling activities for optimal transcription and cell growth.
- University of California, San Diego United States
- UNIVERSITY OF CALIFORNIA SAN DIEGO
- University of California, San Diego United States
- Moores Cancer Center United States
- UC San Diego Health System United States
Adenosine Triphosphatases, Saccharomyces cerevisiae Proteins, Chromosomal Proteins, Non-Histone, Acetylation, Saccharomyces cerevisiae, QH426-470, Chromatin Assembly and Disassembly, Nucleosomes, DNA-Binding Proteins, Enzyme Activation, Histones, Gene Expression Regulation, Fungal, Mutation, Genetics, Research Article, Histone Acetyltransferases, Protein Binding
Adenosine Triphosphatases, Saccharomyces cerevisiae Proteins, Chromosomal Proteins, Non-Histone, Acetylation, Saccharomyces cerevisiae, QH426-470, Chromatin Assembly and Disassembly, Nucleosomes, DNA-Binding Proteins, Enzyme Activation, Histones, Gene Expression Regulation, Fungal, Mutation, Genetics, Research Article, Histone Acetyltransferases, Protein Binding
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