2BYK

Histone fold heterodimer of the Chromatin Accessibility Complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.4 Å
  • R-Value Free: 0.278 
  • R-Value Work: 0.237 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

The Histone Fold Subunits of Drosophila Chrac Facilitate Nucleosome Sliding Through Dynamic DNA Interactions.

Hartlepp, K.F.Fernandez-Tornero, C.Eberharter, A.Grune, T.Muller, C.W.Becker, P.B.

(2005) Mol.Cell.Biol. 25: 9886

  • DOI: 10.1128/MCB.25.22.9886-9896.2005
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The chromatin accessibility complex (CHRAC) is an abundant, evolutionarily conserved nucleosome remodeling machinery able to catalyze histone octamer sliding on DNA. CHRAC differs from the related ACF complex by the presence of two subunits with mole ...

    The chromatin accessibility complex (CHRAC) is an abundant, evolutionarily conserved nucleosome remodeling machinery able to catalyze histone octamer sliding on DNA. CHRAC differs from the related ACF complex by the presence of two subunits with molecular masses of 14 and 16 kDa, whose structure and function were not known. We determined the structure of Drosophila melanogaster CHRAC14-CHRAC16 by X-ray crystallography at 2.4-angstroms resolution and found that they dimerize via a variant histone fold in a typical handshake structure. In further analogy to histones, CHRAC14-16 contain unstructured N- and C-terminal tail domains that protrude from the handshake structure. A dimer of CHRAC14-16 can associate with the N terminus of ACF1, thereby completing CHRAC. Low-affinity interactions of CHRAC14-16 with DNA significantly improve the efficiency of nucleosome mobilization by limiting amounts of ACF. Deletion of the negatively charged C terminus of CHRAC16 enhances DNA binding 25-fold but leads to inhibition of nucleosome sliding, in striking analogy to the effect of the DNA chaperone HMGB1 on nucleosome sliding. The presence of a surface compatible with DNA interaction and the geometry of an H2A-H2B heterodimer may provide a transient acceptor site for DNA dislocated from the histone surface and therefore facilitate the nucleosome remodeling process.


    Organizational Affiliation

    European Molecular Biology Laboratory, Grenoble Outstation, France.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
CHRAC-16
A, C
140Drosophila melanogasterMutation(s): 0 
Gene Names: Chrac-16 (15736, 20K protein, BcDNA:RE59557, CHRAC, CHRAC-16, CHRAC16, Chrac16, Dmel\CG15736, JOEY, joey)
Find proteins for Q9V452 (Drosophila melanogaster)
Go to UniProtKB:  Q9V452
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
CHRAC-14
B, D
128Drosophila melanogasterMutation(s): 0 
Gene Names: Chrac-14 (13399, 18K protein, 55A11T, CG32956, CHRAC, CHRAC-14, chrac-14, CHRAC14, Chrac14, dChrac14, Dmel\CG13399, ESTS:55A11T, MARY, mary)
Find proteins for Q9V444 (Drosophila melanogaster)
Go to UniProtKB:  Q9V444
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

Download SDF File 
Download CCD File 
A, B, D
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.4 Å
  • R-Value Free: 0.278 
  • R-Value Work: 0.237 
  • Space Group: P 32 2 1
Unit Cell:
Length (Å)Angle (°)
a = 76.010α = 90.00
b = 76.010β = 90.00
c = 166.080γ = 120.00
Software Package:
Software NamePurpose
AMoREphasing
MOSFLMdata reduction
SCALAdata scaling
CNSrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2005-11-09
    Type: Initial release
  • Version 1.1: 2011-05-08
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance