1KX5

X-Ray Structure of the Nucleosome Core Particle, NCP147, at 1.9 A Resolution

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.94 Å
  • R-Value Free: 0.275 
  • R-Value Work: 0.208 
  • R-Value Observed: 0.209 

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This is version 1.2 of the entry. See complete history. 


Literature

Solvent Mediated Interactions in the Structure of the Nucleosome Core Particle at 1.9 A Resolution

Davey, C.A., Sargent, D.F., Luger, K., Maeder, A.W., Richmond, T.J.

(2002) J Mol Biol 319: 1097-1113

  • DOI: 10.1016/S0022-2836(02)00386-8
  • Primary Citation of Related Structures:  
    1KX5, 1KX4, 1KX3

  • PubMed Abstract: 

    • Solvent binding in the nucleosome core particle containing a 147 base pair, defined-sequence DNA is characterized from the X-ray crystal structure at 1.9 A resolution. A single-base-pair increase in DNA length over that used previously results in substantially improved clarity of the electron density and accuracy for the histone protein and DNA atomic coordinates ...

    Solvent binding in the nucleosome core particle containing a 147 base pair, defined-sequence DNA is characterized from the X-ray crystal structure at 1.9 A resolution. A single-base-pair increase in DNA length over that used previously results in substantially improved clarity of the electron density and accuracy for the histone protein and DNA atomic coordinates. The reduced disorder has allowed for the first time extensive modeling of water molecules and ions. Over 3000 water molecules and 18 ions have been identified. Water molecules acting as hydrogen-bond bridges between protein and DNA are approximately equal in number to the direct hydrogen bonds between these components. Bridging water molecules have a dual role in promoting histone-DNA association not only by providing further stability to direct protein-DNA interactions, but also by enabling formation of many additional interactions between more distantly related elements. Water molecules residing in the minor groove play an important role in facilitating insertion of arginine side-chains. Water structure at the interface of the histones and DNA provides a means of accommodating intrinsic DNA conformational variation, thus limiting the sequence dependency of nucleosome positioning while enhancing mobility. Monovalent anions are bound near the N termini of histone alpha-helices that are not occluded by DNA phosphate groups. Their location in proximity to the DNA phosphodiester backbone suggests that they damp the electrostatic interaction between the histone proteins and the DNA. Divalent cations are bound at specific sites in the nucleosome core particle and contribute to histone-histone and histone-DNA interparticle interactions. These interactions may be relevant to nucleosome association in arrays.

    Related Citations: 
    • Crystal structure of the nucleosome core particle at 2.8 A resolution
      Luger, K., Maeder, A.W., Richmond, R.K., Sargent, D.F., Richmond, T.J.
      (1997) Nature 389: 251
    • DNA-dependent divalent cation binding in the nucleosome core particle.
      Davey, C.A., Richmond, T.J.
      (2002) Proc Natl Acad Sci U S A 99: 11169
    • DNA structure in the nucleosome core
      Richmond, T.J., Davey, C.A.
      () To be published --: --
    Organizational Affiliation: 

    Institut für Molekularbiologie und Biophysik, ETH-Hönggerberg, CH-8093 Zurich, Switzerland.



Macromolecules

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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
histone H3 A, E135Xenopus laevisMutation(s): 0 
Find proteins for P84233 (Xenopus laevis)
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Go to UniProtKB:  P84233
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  • Reference Sequence
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Entity ID: 4
MoleculeChainsSequence LengthOrganismDetailsImage
histone H4 B, F102Xenopus laevisMutation(s): 0 
Find proteins for P62799 (Xenopus laevis)
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Go to UniProtKB:  P62799
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  • Reference Sequence
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Entity ID: 5
MoleculeChainsSequence LengthOrganismDetailsImage
histone H2A.1 C, G128Xenopus laevisMutation(s): 1 
Find proteins for P06897 (Xenopus laevis)
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Go to UniProtKB:  P06897
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  • Reference Sequence
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Entity ID: 6
MoleculeChainsSequence LengthOrganismDetailsImage
histone H2B.2 D, H125Xenopus laevisMutation(s): 1 
Find proteins for P02281 (Xenopus laevis)
Explore P02281 
Go to UniProtKB:  P02281
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  • Reference Sequence
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Entity ID: 1
MoleculeChainsLengthOrganismImage
DNA (5'(ATCAATATCCACCTGCAGATACTACCAAAAGTGTATTTGGAAACTGCTCCATCAAAAGGCATGTTCAGCTGGAATCCAGCTGAACATGCCTTTTGATGGAGCAGTTTCCAAATACACTTTTGGTAGTATCTGCAGGTGGATATTGAT)3')I147Homo sapiens
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Entity ID: 2
MoleculeChainsLengthOrganismImage
DNA (5'(ATCAATATCCACCTGCAGATACTACCAAAAGTGTATTTGGAAACTGCTCCATCAAAAGGCATGTTCAGCTGGATTCCAGCTGAACATGCCTTTTGATGGAGCAGTTTCCAAATACACTTTTGGTAGTATCTGCAGGTGGATATTGAT)3')J147Homo sapiens
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.94 Å
  • R-Value Free: 0.275 
  • R-Value Work: 0.208 
  • R-Value Observed: 0.209 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 105.95α = 90
b = 181.17β = 90
c = 109.49γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
CNSrefinement
CNSphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2002-12-25
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance