2HUE

Structure of the H3-H4 chaperone Asf1 bound to histones H3 and H4


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.70 Å
  • R-Value Free: 0.239 
  • R-Value Work: 0.209 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Structural basis for the histone chaperone activity of asf1.

English, C.M.Adkins, M.W.Carson, J.J.Churchill, M.E.Tyler, J.K.

(2006) Cell 127: 495-508

  • DOI: 10.1016/j.cell.2006.08.047
  • Primary Citation of Related Structures:  
    2HUE

  • PubMed Abstract: 
  • Anti-silencing function 1 (Asf1) is a highly conserved chaperone of histones H3/H4 that assembles or disassembles chromatin during transcription, replication, and repair. The structure of the globular domain of Asf1 bound to H3/H4 determined by X-ray crystallography to a resolution of 1 ...

    Anti-silencing function 1 (Asf1) is a highly conserved chaperone of histones H3/H4 that assembles or disassembles chromatin during transcription, replication, and repair. The structure of the globular domain of Asf1 bound to H3/H4 determined by X-ray crystallography to a resolution of 1.7 Angstroms shows how Asf1 binds the H3/H4 heterodimer, enveloping the C terminus of histone H3 and physically blocking formation of the H3/H4 heterotetramer. Unexpectedly, the C terminus of histone H4 that forms a mini-beta sheet with histone H2A in the nucleosome undergoes a major conformational change upon binding to Asf1 and adds a beta strand to the Asf1 beta sheet sandwich. Interactions with both H3 and H4 were required for Asf1 histone chaperone function in vivo and in vitro. The Asf1-H3/H4 structure suggests a "strand-capture" mechanism whereby the H4 tail acts as a lever to facilitate chromatin disassembly/assembly that may be used ubiquitously by histone chaperones.


    Organizational Affiliation

    Department of Biochemistry and Molecular Genetics, School of Medicine, University of Colorado, Aurora, CO 80045, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Anti-silencing protein 1 A175Saccharomyces cerevisiaeMutation(s): 0 
Gene Names: ASF1
Find proteins for P32447 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Explore P32447 
Go to UniProtKB:  P32447
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Histone H3 B77Xenopus laevisMutation(s): 1 
Gene Names: H3l
Find proteins for P84233 (Xenopus laevis)
Explore P84233 
Go to UniProtKB:  P84233
Protein Feature View
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  • Reference Sequence
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Histone H4 C84Xenopus laevisMutation(s): 0 
Find proteins for P62799 (Xenopus laevis)
Explore P62799 
Go to UniProtKB:  P62799
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  • Reference Sequence
Small Molecules
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.70 Å
  • R-Value Free: 0.239 
  • R-Value Work: 0.209 
  • Space Group: P 31 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 95.749α = 90
b = 95.749β = 90
c = 110.676γ = 120
Software Package:
Software NamePurpose
PHASERphasing
REFMACrefinement
d*TREKdata reduction
d*TREKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2006-11-21
    Type: Initial release
  • Version 1.1: 2008-05-01
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Non-polymer description, Version format compliance
  • Version 1.3: 2018-01-24
    Changes: Structure summary