6HKT

Structure of an H1-bound 6-nucleosome array


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 9.7 Å
  • R-Value Free: 0.286 
  • R-Value Work: 0.254 

wwPDB Validation 3D Report Full Report


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

  • 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 cryst ...

    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; Université de Lyon, Ecole Normale Supérieure de Lyon, CNRS, Laboratoire de Biologie et de Modélisation de la Cellule LBMC, 46 Allée d'Italie, 69007 Lyon, France.,Département de Génomique Fonctionnelle et Cancer, Institut de Génétique et Biologie Moléculaire et Cellulaire (IGBMC), Université de Strasbourg, CNRS, INSERM, 67404 Illkirch Cedex, France. Electronic address: hamiche@igbmc.fr.,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.,Université Grenoble Alpes, CNRS, CEA, Institut de Biologie Structurale (IBS), 38000 Grenoble, France.,Université Grenoble Alpes, CNRS UMR 5309, INSERM U1209, Institute for Advanced Biosciences (IAB), Site Santé - Allée des Alpes, 38700 La Tronche, France; Laboratory of the Biology and Pathology of the Eye, Institute of Biology and Medical Genetics, First Faculty of Medicine, Charles University and General University Hospital in Prague, Albertov 4, 128 00 Prague 2, Czech Republic. Electronic address: jan.bednar@univ-grenoble-alpes.fr.,Université Grenoble Alpes, CNRS, CEA, Institut de Biologie Structurale (IBS), 38000 Grenoble, France. Electronic address: carlo.petosa@ibs.fr.,Université de Lyon, Ecole Normale Supérieure de Lyon, CNRS, Laboratoire de Biologie et de Modélisation de la Cellule LBMC, 46 Allée d'Italie, 69007 Lyon, France. Electronic address: dimitar.anguelov@ens-lyon.fr.




Macromolecules

Find similar proteins by: Sequence  |  Structure


Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Histone H3.1
A, E, a, e, K, O, k, o, U, Y, u, y
139Homo sapiensMutation(s): 0 
Gene Names: HIST1H3A, HIST1H3B, HIST1H3C, HIST1H3D, HIST1H3E, HIST1H3F, HIST1H3G, HIST1H3H, HIST1H3I, HIST1H3J (H3FA, H3FL, H3FC, H3FB, H3FD, H3FI, H3FH, H3FK, H3FF, H3FJ)
Find proteins for P68431 (Homo sapiens)
Go to UniProtKB:  P68431
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Histone H4
B, F, b, f, L, P, l, p, V, Z, v, z
106Homo sapiensMutation(s): 0 
Gene Names: HIST1H4A, HIST1H4B, HIST1H4C, HIST1H4D, HIST1H4E, HIST1H4F, HIST1H4H, HIST1H4I, HIST1H4J, HIST1H4K, HIST1H4L, HIST2H4A, HIST2H4B, HIST4H4 (H4/A, H4FA, H4/I, H4FI, H4/G, H4FG, H4/B, H4FB, H4/J, H4FJ, H4/C, H4FC, H4/H, H4FH, H4/M, H4FM, H4/E, H4FE, H4/D, H4FD, H4/K, H4FK, H4/N, H4F2, H4FN, HIST2H4, H4/O, H4FO)
Find proteins for P62805 (Homo sapiens)
Go to UniProtKB:  P62805
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
Histone H2A type 1-B/E
C, G, c, g, M, Q, m, q, W, 0, w, 2
133Homo sapiensMutation(s): 0 
Gene Names: HIST1H2AB, HIST1H2AE (H2AFM, H2AFA)
Find proteins for P04908 (Homo sapiens)
Go to Gene View: HIST1H2AB HIST1H2AE
Go to UniProtKB:  P04908
Entity ID: 4
MoleculeChainsSequence LengthOrganismDetails
Histone H2B type 1-J
D, H, d, h, N, R, n, r, X, 1, x, 3
129Homo sapiensMutation(s): 0 
Gene Names: HIST1H2BJ (H2BFR)
Find proteins for P06899 (Homo sapiens)
Go to Gene View: HIST1H2BJ
Go to UniProtKB:  P06899
Entity ID: 5
MoleculeChainsLengthOrganism
DNA (1122-MER)I1122synthetic construct
Entity ID: 6
MoleculeChainsLengthOrganism
DNA (1122-MER)J1122synthetic construct
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 9.7 Å
  • R-Value Free: 0.286 
  • R-Value Work: 0.254 
  • Space Group: P 2 21 21
Unit Cell:
Length (Å)Angle (°)
a = 111.078α = 90.00
b = 238.761β = 90.00
c = 674.368γ = 90.00
Software Package:
Software NamePurpose
Aimlessdata scaling
PHASERphasing
PHENIXrefinement
XDSdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



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 

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