6HKT

Structure of an H1-bound 6-nucleosome array

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 9.70 Å
  • R-Value Free: 0.286 
  • R-Value Work: 0.254 
  • R-Value Observed: 0.255 

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


Literature

Structure of an H1-Bound 6-Nucleosome Array Reveals an Untwisted Two-Start Chromatin Fiber Conformation.

Garcia-Saez, I., Menoni, H., Boopathi, R., Shukla, M.S., Soueidan, L., Noirclerc-Savoye, M., Le Roy, A., Skoufias, D.A., Bednar, J., Hamiche, A., Angelov, D., Petosa, C., Dimitrov, S.

(2018) Mol Cell 72: 902-915.e7

  • DOI: 10.1016/j.molcel.2018.09.027
  • Primary Citation of Related Structures:  
    6HKT

  • PubMed Abstract: 

    • Chromatin adopts a diversity of regular and irregular fiber structures in vitro and in vivo. However, how an array of nucleosomes folds into and switches between different fiber conformations is poorly understood. We report the 9.7 Å resolution crystal structure of a 6-nucleosome array bound to linker histone H1 determined under ionic conditions that favor incomplete chromatin condensation ...

    Chromatin adopts a diversity of regular and irregular fiber structures in vitro and in vivo. However, how an array of nucleosomes folds into and switches between different fiber conformations is poorly understood. We report the 9.7 Å resolution crystal structure of a 6-nucleosome array bound to linker histone H1 determined under ionic conditions that favor incomplete chromatin condensation. The structure reveals a flat two-start helix with uniform nucleosomal stacking interfaces and a nucleosome packing density that is only half that of a twisted 30-nm fiber. Hydroxyl radical footprinting indicates that H1 binds the array in an on-dyad configuration resembling that observed for mononucleosomes. Biophysical, cryo-EM, and crosslinking data validate the crystal structure and reveal that a minor change in ionic environment shifts the conformational landscape to a more compact, twisted form. These findings provide insights into the structural plasticity of chromatin and suggest a possible assembly pathway for a 30-nm fiber.

    Organizational Affiliation: 

    Université Grenoble Alpes, CNRS UMR 5309, INSERM U1209, Institute for Advanced Biosciences (IAB), Site Santé - Allée des Alpes, 38700 La Tronche, France; "Roumen Tsanev" Institute of Molecular Biology, Bulgarian Academy of Sciences, Sofia, Bulgaria. Electronic address: stefan.dimitrov@univ-grenoble-alpes.fr.



Macromolecules

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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Histone H3.1139Homo sapiensMutation(s): 0 
Gene Names: 
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Find proteins for P68431 (Homo sapiens)
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PHAROS:  P68431
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UniProt GroupP68431
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Histone H4106Homo sapiensMutation(s): 0 
Gene Names: 
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Find proteins for P62805 (Homo sapiens)
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PHAROS:  P62805
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UniProt GroupP62805
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Histone H2A type 1-B/E133Homo sapiensMutation(s): 0 
Gene Names: HIST1H2AB, H2AFM, HIST1H2AE, H2AFA, H2AC4, H2AC8
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Find proteins for P04908 (Homo sapiens)
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PHAROS:  P04908
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UniProt GroupP04908
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Entity ID: 4
MoleculeChainsSequence LengthOrganismDetailsImage
Histone H2B type 1-J129Homo sapiensMutation(s): 0 
Gene Names: HIST1H2BJ, H2BFR, H2BC11
UniProt & NIH Common Fund Data Resources
Find proteins for P06899 (Homo sapiens)
Explore P06899 
Go to UniProtKB:  P06899
PHAROS:  P06899
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UniProt GroupP06899
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Entity ID: 5
MoleculeChainsLengthOrganismImage
DNA (1122-MER)I1,122synthetic construct
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Entity ID: 6
MoleculeChainsLengthOrganismImage
DNA (1122-MER)J1,122synthetic construct
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Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 9.70 Å
  • R-Value Free: 0.286 
  • R-Value Work: 0.254 
  • R-Value Observed: 0.255 
  • Space Group: P 2 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 111.078α = 90
b = 238.761β = 90
c = 674.368γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
Aimlessdata scaling
PHASERphasing

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
French National Research AgencyFranceANR-10-LABX-0030, ANR-12-BSV5-0017, ANR-14-CE09-0019, ANR-16- CE12-0013, ANR-17-CE11-0019, ANR-18-CE12-0010

Revision History  (Full details and data files)

  • Version 1.0: 2018-10-31
    Type: Initial release
  • Version 1.1: 2018-11-14
    Changes: Data collection, Database references
  • Version 1.2: 2018-12-19
    Changes: Data collection, Database references