7DBP

Linker histone defines structure and self-association behaviour of the 177 bp human chromosome

Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4.50 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

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Literature

Linker histone defines structure and self-association behaviour of the 177 bp human chromatosome.

Wang, S., Vogirala, V.K., Soman, A., Berezhnoy, N.V., Liu, Z.B., Wong, A.S.W., Korolev, N., Su, C.J., Sandin, S., Nordenskiold, L.

(2021) Sci Rep 11: 380-380

  • DOI: 10.1038/s41598-020-79654-8
  • Primary Citation of Related Structures:  
    7DBP

  • PubMed Abstract: 

    • Linker histones play essential roles in the regulation and maintenance of the dynamic chromatin structure of higher eukaryotes. The influence of human histone H1.0 on the nucleosome structure and biophysical properties of the resulting chromatosome were investigated and compared with the 177-bp nucleosome using Cryo-EM and SAXS ...

    Linker histones play essential roles in the regulation and maintenance of the dynamic chromatin structure of higher eukaryotes. The influence of human histone H1.0 on the nucleosome structure and biophysical properties of the resulting chromatosome were investigated and compared with the 177-bp nucleosome using Cryo-EM and SAXS. The 4.5 Å Cryo-EM chromatosome structure showed that the linker histone binds at the nucleosome dyad interacting with both linker DNA arms but in a tilted manner leaning towards one of the linker sides. The chromatosome is laterally compacted and rigid in the dyad and linker DNA area, in comparison with the nucleosome where linker DNA region is more flexible and displays structural variability. In solution, the chromatosomes appear slightly larger than the nucleosomes, with the volume increase compared to the bound linker histone, according to solution SAXS measurements. SAXS X-ray diffraction characterisation of Mg-precipitated samples showed that the different shapes of the 177 chromatosome enabled the formation of a highly ordered lamello-columnar phase when precipitated by Mg 2+ , indicating the influence of linker histone on the nucleosome stacking. The biological significance of linker histone, therefore, may be affected by the change in the polyelectrolyte and DNA conformation properties of the chromatosomes, in comparison to nucleosomes.

    Organizational Affiliation: 

    School of Biological Sciences, Nanyang Technological University, 60 Nanyang Dr., Singapore, 637551, Singapore. LarsNor@ntu.edu.sg.



Macromolecules

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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Histone H1.0A [auth K]211Homo sapiensMutation(s): 0 
Gene Names: H1-0, H1F0, H1FV
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PHAROS:  P07305
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UniProt GroupP07305
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Histone H3.1B [auth A],
F [auth E]		136Homo sapiensMutation(s): 0 
Gene Names: 
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PHAROS:  P68431
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Histone H4C [auth B],
G [auth F]		103Homo 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: 4
MoleculeChainsSequence LengthOrganismDetailsImage
Histone H2A type 1-B/ED [auth C],
H [auth G]		130Homo sapiensMutation(s): 0 
Gene Names: H2AC4, H2AFM, HIST1H2AB, H2AC8, H2AFA, HIST1H2AE
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Find proteins for P04908 (Homo sapiens)
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Entity ID: 5
MoleculeChainsSequence LengthOrganismDetailsImage
Histone H2B type 1-KE [auth D],
I [auth H]		126Homo sapiensMutation(s): 0 
Gene Names: H2BC12, H2BFT, HIRIP1, HIST1H2BK
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Entity ID: 6
MoleculeChainsLengthOrganismImage
DNA (175-MER)J [auth I]177synthetic construct
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Entity ID: 7
MoleculeChainsLengthOrganismImage
DNA (175-MER)K [auth J]177synthetic construct
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Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4.50 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Ministry of Education (MoE, Singapore)SingaporeMOE2012-T3-1-001
Ministry of Education (MoE, Singapore)Singapore2014-T1-001-134

Revision History  (Full details and data files)

  • Version 1.0: 2020-12-23
    Type: Initial release
  • Version 1.1: 2021-01-27
    Changes: Database references