The histone variant H2A.Z marking permissive chromatin is deposited by the multicomponent SWR1 chromatin remodeler, which is targeted to nucleosome-free promoters by a DNA length-sensing module. How SWR1 is directed to the flanking acetylated +1 nucleosome, its physiological substrate, has been enigmatic. We show by live-cell, single-molecule tracking that SWR1 subunits Bdf1 and Yaf9 harboring histone acetylation reader domains differentially regulate chromatin binding: Bdf1 promotes SWR1 association, while Yaf9-YEATS slows its dissociation. Notably, single-molecule tracking and genome-wide chromatin immunoprecipitation combined with exonuclease treatment reveal Bdf1 and Yaf9 contributions to global SWR1 targeting and histone exchange at +1 nucleosomes. Our findings highlight the in-cell biochemistry of histone readers and suggest a generalizable, two-stage mechanism wherein acetylated nucleosome interactions initially constrain the three-dimensional diffusion of SWR1 to increase local concentration, followed by stochastic one-dimensional diffusion at nucleosome-depleted regions with directional capture by acetylated +1 nucleosomes.
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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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| Evidence ID | Analyze ID | File | Description |
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