7N8N

Melbournevirus nucleosome like particle

Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.89 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history. 


Literature

Virus-encoded histone doublets are essential and form nucleosome-like structures.

Liu, Y., Bisio, H., Toner, C.M., Jeudy, S., Philippe, N., Zhou, K., Bowerman, S., White, A., Edwards, G., Abergel, C., Luger, K.

(2021) Cell 184: 4237-4250.e19

  • DOI: https://doi.org/10.1016/j.cell.2021.06.032
  • Primary Citation of Related Structures:  
    7N8N

  • PubMed Abstract: 

    • The organization of genomic DNA into defined nucleosomes has long been viewed as a hallmark of eukaryotes. This paradigm has been challenged by the identification of "minimalist" histones in archaea and more recently by the discovery of genes that encode fused remote homologs of the four eukaryotic histones in Marseilleviridae, a subfamily of giant viruses that infect amoebae ...

    The organization of genomic DNA into defined nucleosomes has long been viewed as a hallmark of eukaryotes. This paradigm has been challenged by the identification of "minimalist" histones in archaea and more recently by the discovery of genes that encode fused remote homologs of the four eukaryotic histones in Marseilleviridae, a subfamily of giant viruses that infect amoebae. We demonstrate that viral doublet histones are essential for viral infectivity, localize to cytoplasmic viral factories after virus infection, and ultimately are found in the mature virions. Cryogenic electron microscopy (cryo-EM) structures of viral nucleosome-like particles show strong similarities to eukaryotic nucleosomes despite the limited sequence identify. The unique connectors that link the histone chains contribute to the observed instability of viral nucleosomes, and some histone tails assume structural roles. Our results further expand the range of "organisms" that require nucleosomes and suggest a specialized function of histones in the biology of these unusual viruses.

    Organizational Affiliation: 

    Department of Biochemistry, University of Colorado Boulder, Boulder, CO 80309, USA; Howard Hughes Medical Institute, University of Colorado Boulder, Boulder, CO 80309, USA. Electronic address: karolin.luger@colorado.edu.



Macromolecules

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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Histone H4-H3 doublet
A, C
244MelbournevirusMutation(s): 0 
Gene Names: MEL_368
UniProt
Find proteins for A0A097I2D0 (Melbournevirus)
Explore A0A097I2D0 
Go to UniProtKB:  A0A097I2D0
Entity Groups  
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UniProt GroupA0A097I2D0
Protein Feature View
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Histone H2B-H2A doublet
B, D
297MelbournevirusMutation(s): 0 
Gene Names: MEL_369
UniProt
Find proteins for A0A097I2B5 (Melbournevirus)
Explore A0A097I2B5 
Go to UniProtKB:  A0A097I2B5
Entity Groups  
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UniProt GroupA0A097I2B5
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Entity ID: 3
MoleculeChainsLengthOrganismImage
DNA (147-MER)E [auth I]147Escherichia coli
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Entity ID: 4
MoleculeChainsLengthOrganismImage
DNA (147-MER)F [auth J]147Escherichia coli
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.89 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Howard Hughes Medical Institute (HHMI)United States--

Revision History  (Full details and data files)

  • Version 1.0: 2021-08-04
    Type: Initial release
  • Version 1.1: 2021-08-25
    Changes: Database references