Biological Assembly 1  

 3D View: Structure

Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Hetero 8-mer - A2B2C2D2 Pseudo Symmetry: Cyclic - C2  (3D View)
Pseudo Stoichiometry: Homo 8-mer - A8 

Biological assembly 1 assigned by authors and generated by PISA,PQS (software)

Macromolecule Content

• Total Structure Weight: 54.55 kDa 
• Atom Count: 2850 
• Modelled Residue Count: 362 
• Deposited Residue Count: 492 
• Unique protein chains: 4

2HIO

HISTONE OCTAMER (CHICKEN), CHROMOSOMAL PROTEIN

• DOI: 10.2210/pdb2HIO/pdb

• Classification: STRUCTURAL PROTEIN,DNA BINDING PROTEIN
• Organism(s): Gallus gallus
• Mutation(s): No 


• Deposited: 1999-06-15 Released: 2000-01-12 
• Deposition Author(s): Arents, G., Moudrianakis, E.N.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 3.10 Å
• R-Value Observed: 0.255 

Literature

The nucleosomal core histone octamer at 3.1 A resolution: a tripartite protein assembly and a left-handed superhelix.

Arents, G., Burlingame, R.W., Wang, B.C., Love, W.E., Moudrianakis, E.N.

(1991) Proc Natl Acad Sci U S A 88: 10148-10152

• PubMed: 1946434 
• DOI: 10.1073/pnas.88.22.10148
• Primary Citation of Related Structures:  
  1HIO, 2HIO


• PubMed Abstract: 
  

The structure of the octameric histone core of the nucleosome has been determined by x-ray crystallography to a resolution of 3.1 A. The histone octamer is a tripartite assembly in which a centrally located (H3-H4)2 tetramer is flanked by two H2A-H2B dimers. It has a complex outer surface; depending on the perspective, the structure appears as a wedge or as a flat disk. The disk represents the planar projection of a left-handed proteinaceous superhelix with approximately 28 A pitch. The diameter of the particle is 65 A and the length is 60 A at its maximum and approximately 10 A at its minimum extension; these dimensions are in agreement with those reported earlier by Klug et al. [Klug, A., Rhodes, D., Smith, J., Finch, J. T. & Thomas, J. O. (1980) Nature (London) 287, 509-516]. The folded histone chains are elongated rather than globular and are assembled in a characteristic "handshake" motif. The individual polypeptides share a common central structural element of the helix-loop-helix type, which we name the histone fold.

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Related Citations: 

• Spectropolarimetric Analysis of the Core Histone Octamer and its Subunits
  Godfrey, J.E., Baxevanis, A.D., Moudrianakis, E.N.
  (1990) Biochemistry 29: 965

• Crystallographic Structure of the Octameric Histone Core of the Nucleosome at a Resolution of 3.3 A
  Burlingame, R.W., Love, W.E., Wang, B.C., Hamlin, R., Xuong, N.H., Moudrianakis, E.N.
  (1985) Science 228: 546

• Crystals of the Octameric Histone Core of the Nucleosome
  Burlingame, R.W., Love, W.E., Moudrianakis, E.N.
  (1984) Science 223: 413

• Reversible Association of Calf Thymus Histones to Form the Symmetrical Octamer (H2Ah2Bh3H4)2: A Case of a Mixed-Associating System
  Godfrey, J.E., Eickbush, T.H., Moudrianakis, E.N.
  (1980) Biochemistry 19: 1339

• The Histone Core Complex: An Octamer Assembled by Two Sets of Protein-Protein Interactions
  Eickbush, T.H., Moudrianakis, E.N.
  (1978) Biochemistry 17: 4955

• The Compaction of DNA Helices Into Either Continuous Supercoils or Folded-Fiber Rods and Toroids
  Eickbush, T.H., Moudrianakis, E.N.
  (1978) Cell 13: 295

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Organizational Affiliation: 

Department of Biology, Johns Hopkins University, Baltimore, MD 21218.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
PROTEIN (HISTONE H2A)	A	128	Gallus gallus	Mutation(s): 0
Find proteins for P02263 (Gallus gallus) Explore P02263  Go to UniProtKB:  P02263

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
PROTEIN (HISTONE H2B)	B	125	Gallus gallus	Mutation(s): 0  Gene Names: H2B-VII
Find proteins for P0C1H5 (Gallus gallus) Explore P0C1H5  Go to UniProtKB:  P0C1H5

Entity ID: 3
Molecule	Chains	Sequence Length	Organism	Details	Image
PROTEIN (HISTONE H3)	C	136	Gallus gallus	Mutation(s): 0  Gene Names: H3-I, H3-II, H3-III, H3-IV, H3-V, H3-VI, H3-VII, H3-VIII
Find proteins for P84229 (Gallus gallus) Explore P84229  Go to UniProtKB:  P84229

Entity ID: 4
Molecule	Chains	Sequence Length	Organism	Details	Image
PROTEIN (HISTONE H4)	D	103	Gallus gallus	Mutation(s): 0  Gene Names: H4-I, H4-II, H4-III, H4-IV, H4-V, H4-VI, H4-VII
Find proteins for P62801 (Gallus gallus) Explore P62801  Go to UniProtKB:  P62801

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 3.10 Å
• R-Value Observed: 0.255 
• Space Group: P 3₂ 2 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 118.82	α = 90
b = 118.82	β = 90
c = 102.93	γ = 120

Software Package:

Software Name	Purpose
PROFFT	refinement

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 1999-06-15 
• Released Date: 2000-01-12 
Deposition Author(s): Arents, G., Moudrianakis, E.N.

Revision History  

• Version 1.0: 2000-01-12
  Type: Initial release
  
• Version 1.1: 2008-04-26
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Derived calculations, Version format compliance