4YS3 image
Entry Detail
PDB ID:
4YS3
Title:
Nucleosome disassembly by RSC and SWI/SNF is enhanced by H3 acetylation near the nucleosome dyad axis
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2015-03-16
Release Date:
2015-10-14
Method Details:
Experimental Method:
Resolution:
3.00 Å
R-Value Free:
0.27
R-Value Work:
0.22
Space Group:
P 21 21 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Histone H3.2
Chain IDs:A, E
Chain Length:98
Number of Molecules:2
Biological Source:Xenopus laevis
Polymer Type:polypeptide(L)
Description:Histone H4
Chain IDs:B, F
Chain Length:79
Number of Molecules:2
Biological Source:Xenopus laevis
Polymer Type:polypeptide(L)
Description:Histone H2A
Chain IDs:C, G
Chain Length:107
Number of Molecules:2
Biological Source:Xenopus laevis
Polymer Type:polypeptide(L)
Description:Histone H2B 1.1
Chain IDs:D, H
Chain Length:93
Number of Molecules:2
Biological Source:Xenopus laevis
Polymer Type:polydeoxyribonucleotide
Description:DNA (147-MER)
Chain IDs:I
Chain Length:147
Number of Molecules:1
Biological Source:Homo sapiens
Polymer Type:polydeoxyribonucleotide
Description:DNA (147-MER)
Chain IDs:J
Chain Length:147
Number of Molecules:1
Biological Source:Homo sapiens
Modified Residue
Compound ID Chain ID Parent Comp ID Details 2D Image
ALY A LYS modified residue
Primary Citation
Histone Acetylation near the Nucleosome Dyad Axis Enhances Nucleosome Disassembly by RSC and SWI/SNF.
Mol.Cell.Biol. 35 4083 4092 (2015)
PMID: 26416878 DOI: 10.1128/MCB.00441-15

Abstact

Signaling associated with transcription activation occurs through posttranslational modification of histones and is best exemplified by lysine acetylation. Lysines are acetylated in histone tails and the core domain/lateral surface of histone octamers. While acetylated lysines in histone tails are frequently recognized by other factors referred to as "readers," which promote transcription, the mechanistic role of the modifications in the lateral surface of the histone octamer remains unclear. By using X-ray crystallography, we found that acetylated lysines 115 and 122 in histone H3 are solvent accessible, but in biochemical assays they appear not to interact with the bromodomains of SWI/SNF and RSC to enhance recruitment or nucleosome mobilization, as previously shown for acetylated lysines in H3 histone tails. Instead, we found that acetylation of lysines 115 and 122 increases the predisposition of nucleosomes for disassembly by SWI/SNF and RSC up to 7-fold, independent of bromodomains, and only in conjunction with contiguous nucleosomes. Thus, in combination with SWI/SNF and RSC, acetylation of lateral surface lysines in the histone octamer serves as a crucial regulator of nucleosomal dynamics distinct from the histone code readers and writers.

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