3C9K

Model of Histone Octamer Tubular Crystals


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 20.0 Å
  • Aggregation State: FILAMENT 
  • Reconstruction Method: HELICAL 

Starting Model: experimental
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This is version 1.4 of the entry. See complete history


Literature

Histone octamer helical tubes suggest that an internucleosomal four-helix bundle stabilizes the chromatin fiber

Frouws, T.D.Patterton, H.G.Sewell, B.T.

(2009) Biophys J 96: 3363-3371

  • DOI: https://doi.org/10.1016/j.bpj.2008.10.075
  • Primary Citation of Related Structures:  
    3C9K

  • PubMed Abstract: 

    A major question in chromatin involves the exact organization of nucleosomes within the 30-nm chromatin fiber and its structural determinants of assembly. Here we investigate the structure of histone octamer helical tubes via the method of iterative helical real-space reconstruction. Accurate placement of the x-ray structure of the histone octamer within the reconstructed density yields a pseudoatomic model for the entire helix, and allows precise identification of molecular interactions between neighboring octamers. One such interaction that would not be obscured by DNA in the nucleosome consists of a twofold symmetric four-helix bundle formed between pairs of H2B-alpha3 and H2B-alphaC helices of neighboring octamers. We believe that this interface can act as an internucleosomal four-helix bundle within the context of the chromatin fiber. The potential relevance of this interface in the folding of the 30-nm chromatin fiber is discussed.


  • Organizational Affiliation

    Department of Biotechnology, University of the Western Cape, Cape Town, South Africa.


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Histone H2A-IV
A, E
128Gallus gallusMutation(s): 0 
UniProt
Find proteins for P02263 (Gallus gallus)
Explore P02263 
Go to UniProtKB:  P02263
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UniProt GroupP02263
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  • Reference Sequence
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Histone H2B 7
B, F
125Gallus gallusMutation(s): 0 
UniProt
Find proteins for P0C1H5 (Gallus gallus)
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UniProt GroupP0C1H5
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  • Reference Sequence
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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
Histone H3.2
C, G
135Gallus gallusMutation(s): 0 
UniProt
Find proteins for P84229 (Gallus gallus)
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UniProt GroupP84229
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  • Reference Sequence
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Entity ID: 4
MoleculeChains Sequence LengthOrganismDetailsImage
Histone H4
D, H
102Gallus gallusMutation(s): 0 
UniProt
Find proteins for P62801 (Gallus gallus)
Explore P62801 
Go to UniProtKB:  P62801
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UniProt GroupP62801
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 20.0 Å
  • Aggregation State: FILAMENT 
  • Reconstruction Method: HELICAL 
EM Software:
TaskSoftware PackageVersion
RECONSTRUCTIONSPIDER

Structure Validation

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Entry History 

Deposition Data

  • Released Date: 2009-01-06 
  • Deposition Author(s): Frouws, T.D.

Revision History  (Full details and data files)

  • Version 1.0: 2009-01-06
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2012-09-05
    Changes: Database references
  • Version 1.3: 2019-12-11
    Changes: Author supporting evidence, Data collection, Database references
  • Version 1.4: 2024-03-13
    Changes: Data collection, Database references, Derived calculations, Refinement description