3JB7

In situ structures of the segmented genome and RNA polymerase complex inside a dsRNA virus


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4.00 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

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This is version 1.5 of the entry. See complete history


Literature

In situ structures of the segmented genome and RNA polymerase complex inside a dsRNA virus.

Zhang, X.Ding, K.Yu, X.Chang, W.Sun, J.Hong Zhou, Z.

(2015) Nature 527: 531-534

  • DOI: https://doi.org/10.1038/nature15767
  • Primary Citation of Related Structures:  
    3JB6, 3JB7

  • PubMed Abstract: 

    Viruses in the Reoviridae, like the triple-shelled human rotavirus and the single-shelled insect cytoplasmic polyhedrosis virus (CPV), all package a genome of segmented double-stranded RNAs (dsRNAs) inside the viral capsid and carry out endogenous messenger RNA synthesis through a transcriptional enzyme complex (TEC). By direct electron-counting cryoelectron microscopy and asymmetric reconstruction, we have determined the organization of the dsRNA genome inside quiescent CPV (q-CPV) and the in situ atomic structures of TEC within CPV in both quiescent and transcribing (t-CPV) states. We show that the ten segmented dsRNAs in CPV are organized with ten TECs in a specific, non-symmetric manner, with each dsRNA segment attached directly to a TEC. The TEC consists of two extensively interacting subunits: an RNA-dependent RNA polymerase (RdRP) and an NTPase VP4. We find that the bracelet domain of RdRP undergoes marked conformational change when q-CPV is converted to t-CPV, leading to formation of the RNA template entry channel and access to the polymerase active site. An amino-terminal helix from each of two subunits of the capsid shell protein (CSP) interacts with VP4 and RdRP. These findings establish the link between sensing of environmental cues by the external proteins and activation of endogenous RNA transcription by the TEC inside the virus.


  • Organizational Affiliation

    California Nanosystems Institute, Los Angeles, CA 90095, USA.


Macromolecules

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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
CPV RNA-dependent RNA polymerase1,225Bombyx mori cypovirus 1Mutation(s): 0 
EC: 2.7.7.48
UniProt
Find proteins for D0EZK6 (Bombyx mori cytoplasmic polyhedrosis virus)
Explore D0EZK6 
Go to UniProtKB:  D0EZK6
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UniProt GroupD0EZK6
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  • Reference Sequence
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Viral structural protein 4561Bombyx mori cypovirus 1Mutation(s): 0 
UniProt
Find proteins for Q9IR43 (Bombyx mori cytoplasmic polyhedrosis virus)
Explore Q9IR43 
Go to UniProtKB:  Q9IR43
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UniProt GroupQ9IR43
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  • Reference Sequence

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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
VP1 CSPC,
F [auth D]
24Bombyx mori cypovirus 1Mutation(s): 0 
UniProt
Find proteins for D3JWE6 (Bombyx mori cytoplasmic polyhedrosis virus)
Explore D3JWE6 
Go to UniProtKB:  D3JWE6
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UniProt GroupD3JWE6
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  • Reference Sequence

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Entity ID: 4
MoleculeChains LengthOrganismImage
RNA (5'-R(P*GP*GP*GP*GP*GP*G)-3')D [auth t]6Bombyx mori cypovirus 1
Sequence Annotations
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  • Reference Sequence

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Entity ID: 5
MoleculeChains LengthOrganismImage
RNA (5'-R(P*CP*CP*CP*CP*C)-3')E [auth m]5Bombyx mori cypovirus 1
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4.00 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 
EM Software:
TaskSoftware PackageVersion
RECONSTRUCTIONFREALIGN

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2015-10-28
    Type: Initial release
  • Version 1.1: 2015-11-11
    Changes: Database references
  • Version 1.2: 2015-12-02
    Changes: Database references
  • Version 1.3: 2018-07-18
    Changes: Data collection
  • Version 1.4: 2023-04-05
    Changes: Database references, Derived calculations
  • Version 1.5: 2024-05-15
    Changes: Data collection, Refinement description