5X7X

The crystal structure of the nucleosome containing H3.3 at 2.18 angstrom resolution


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.18 Å
  • R-Value Free: 0.256 
  • R-Value Work: 0.227 
  • R-Value Observed: 0.228 

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Literature

Crystal Structure and Characterization of Novel Human Histone H3 Variants, H3.6, H3.7, and H3.8

Taguchi, H.Xie, Y.Horikoshi, N.Maehara, K.Harada, A.Nogami, J.Sato, K.Arimura, Y.Osakabe, A.Kujirai, T.Iwasaki, T.Semba, Y.Tachibana, T.Kimura, H.Ohkawa, Y.Kurumizaka, H.

(2017) Biochemistry 56: 2184-2196

  • DOI: 10.1021/acs.biochem.6b01098
  • Primary Citation of Related Structures:  
    5GXQ, 5X7X

  • PubMed Abstract: 
  • Non-allelic histone variants are considered as epigenetic factors that regulate genomic DNA functions in eukaryotic chromosomes. In this study, we identified three new human histone H3 variants (named H3.6, H3.7, and H3.8), which were previously annotate ...

    Non-allelic histone variants are considered as epigenetic factors that regulate genomic DNA functions in eukaryotic chromosomes. In this study, we identified three new human histone H3 variants (named H3.6, H3.7, and H3.8), which were previously annotated as pseudogenes. H3.6 and H3.8 conserve the H3.3-specific amino acid residues, but H3.7 shares the specific amino acid residues with H3.1. We successfully reconstituted the nucleosome containing H3.6 in vitro and determined its crystal structure. In the H3.6 nucleosome, the H3.6-specific Val62 residue hydrophobically contacts the cognate H4 molecule, but its contact area is smaller than that of the corresponding H3.3 Ile62 residue. The thermal stability assay revealed that the H3.6 nucleosome is substantially unstable, as compared to the H3.3 nucleosome. Interestingly, mutational analysis demonstrated that the H3.6 Val62 residue is fully responsible for the H3.6 nucleosome instability, probably because of the weakened hydrophobic interaction with H4. We also reconstituted the nucleosome containing H3.8, but its thermal stability was quite low. In contrast, purified H3.7 failed to form nucleosomes in vitro. The identification and characterization of these novel human histone H3 variants provide important new insights into understanding the epigenetic regulation of the human genome.


    Organizational Affiliation

    Laboratory of Structural Biology, Graduate School of Advanced Science and Engineering, Research Institute for Science and Engineering, and Institute for Medical-oriented Structural Biology, Waseda University , 2-2 Wakamatsu-cho, Shinjuku-ku, Tokyo 162-8480, Japan.



Macromolecules

Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Histone H3.3 AE139Homo sapiensMutation(s): 0 
Gene Names: H3F3AH3-3AH3.3AH3F3PP781H3-3BH3.3BH3F3B
Find proteins for P84243 (Homo sapiens)
Explore P84243 
Go to UniProtKB:  P84243
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PHAROS:  P84243
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Histone H4 BF106Homo sapiensMutation(s): 0 
Gene Names: 
Find proteins for P62805 (Homo sapiens)
Explore P62805 
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PHAROS:  P62805
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  • Reference Sequence
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Histone H2A type 1-B/E CG133Homo sapiensMutation(s): 0 
Gene Names: HIST1H2ABH2AC4H2AFMH2AC8H2AFAHIST1H2AE
Find proteins for P04908 (Homo sapiens)
Explore P04908 
Go to UniProtKB:  P04908
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PHAROS:  P04908
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  • Reference Sequence
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Entity ID: 4
MoleculeChainsSequence LengthOrganismDetailsImage
Histone H2B type 1-J DH129Homo sapiensMutation(s): 0 
Gene Names: HIST1H2BJH2BFRH2BC11
Find proteins for P06899 (Homo sapiens)
Explore P06899 
Go to UniProtKB:  P06899
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PHAROS:  P06899
Protein Feature View
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  • Reference Sequence
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Entity ID: 5
MoleculeChainsLengthOrganismImage
DNA (146-MER)I, J146Homo sapiens
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.18 Å
  • R-Value Free: 0.256 
  • R-Value Work: 0.227 
  • R-Value Observed: 0.228 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 98.887α = 90
b = 107.509β = 90
c = 167.415γ = 90
Software Package:
Software NamePurpose
HKL-2000data scaling
PHASERphasing
PDB_EXTRACTdata extraction
PHENIXrefinement
HKLdata reduction
HKLdata scaling

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Japan Society for the Promotion of ScienceJapanJP25116002
Japan Society for the Promotion of ScienceJapanJP25250023
Japan Agency for Medical Research and Development (AMED)Japan--
Japan Society for the Promotion of ScienceJapan16J09361

Revision History 

  • Version 1.0: 2017-04-19
    Type: Initial release
  • Version 1.1: 2017-05-24
    Changes: Database references
  • Version 1.2: 2017-10-11
    Changes: Derived calculations
  • Version 2.0: 2017-10-18
    Changes: Author supporting evidence, Polymer sequence