5GH9

Crystal structure of CBP Bromodomain with H3K56ac peptide


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.45 Å
  • R-Value Free: 0.176 
  • R-Value Work: 0.145 
  • R-Value Observed: 0.147 

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Literature

Structural insight into CBP bromodomain-mediated recognition of acetylated histone H3K56ac

Xu, L.Cheng, A.Huang, M.Zhang, J.Jiang, Y.Wang, C.Li, F.Bao, H.Gao, J.Wang, N.Liu, J.Wu, J.Wong, C.C.L.Ruan, K.

(2017) FEBS J 

  • DOI: 10.1111/febs.14198
  • Primary Citation of Related Structures:  
    5GH9

  • PubMed Abstract: 
  • The acetylation of lysine 56 of histone H3 (H3K56ac) enhances the binding affinity of histone chaperones to H3-H4 dimers. CREB-binding protein (CBP) possesses a bromodomain that recognizes H3K56 acetylation. CBP also possesses a histone acetyltransferase (HAT) domain, which has been shown to promote H3K56 acetylation of free histones to facilitate delivery of replication-dependent chaperones to acetylated histones for chromatin assembly ...

    The acetylation of lysine 56 of histone H3 (H3K56ac) enhances the binding affinity of histone chaperones to H3-H4 dimers. CREB-binding protein (CBP) possesses a bromodomain that recognizes H3K56 acetylation. CBP also possesses a histone acetyltransferase (HAT) domain, which has been shown to promote H3K56 acetylation of free histones to facilitate delivery of replication-dependent chaperones to acetylated histones for chromatin assembly. However, the mechanism by which the CBP bromodomain recognizes H3K56ac and the context in which such recognition occurs remain elusive. Here, we solved the crystal structure of the CBP bromodomain in complex with an H3K56ac peptide. Our data demonstrate that the CBP bromodomain recognizes H3K56ac with high affinity. Structural and affinity analyses reveal that the CBP bromodomain prefers an aromatic residue at the -2 position and an arginine at the -4 position from the acetyl-lysine, and that the CBP bromodomain selectively recognizes an extended conformation of the H3 αN helix that contains H3K56ac. We also demonstrate that the CBP bromodomain binds to H3K56ac in a recombinant H3-H4 dimer but not in a mono-nucleosome. Our results suggest that the CBP bromodomain selectively recognizes an extended conformation of the K56-acetylated H3 α N region within an H3-H4 dimer, which is expected to facilitate the HAT activity of CBP for subsequent H3K56 acetylation of free histones.


    Organizational Affiliation

    Hefei National Laboratory for Physical Science at the Microscale, School of Life Sciences, University of Science and Technology of China, Hefei, China.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
CREB-binding proteinA118Homo sapiensMutation(s): 0 
Gene Names: CREBBPCBP
EC: 2.3.1.48 (UniProt), 2.3.1 (UniProt)
UniProt & NIH Common Fund Data Resources
Find proteins for Q92793 (Homo sapiens)
Explore Q92793 
Go to UniProtKB:  Q92793
PHAROS:  Q92793
GTEx:  ENSG00000005339 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ92793
Protein Feature View
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  • Reference Sequence

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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Histone H3B14Homo sapiensMutation(s): 0 
Gene Names: 
UniProt & NIH Common Fund Data Resources
Find proteins for P68431 (Homo sapiens)
Explore P68431 
Go to UniProtKB:  P68431
PHAROS:  P68431
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP68431
Protein Feature View
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  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
ALY
Query on ALY
B L-PEPTIDE LINKINGC8 H16 N2 O3LYS
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.45 Å
  • R-Value Free: 0.176 
  • R-Value Work: 0.145 
  • R-Value Observed: 0.147 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 42.826α = 90
b = 45.832β = 90
c = 66.038γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
HKL-2000data scaling
PDB_EXTRACTdata extraction
HKL-2000data reduction
MOLREPphasing

Structure Validation

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Entry History 

Deposition Data

  • Deposited Date: 2016-06-19 
  • Released Date: 2017-06-21 
  • Deposition Author(s): Xu, L.

Revision History  (Full details and data files)

  • Version 1.0: 2017-06-21
    Type: Initial release
  • Version 1.1: 2017-08-30
    Changes: Database references