6I7M

Influenza A nucleoprotein docked into 3D helical structure of the wild type ribonucleoprotein complex obtained using cryoEM. Conformation 4.


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 10.0 Å
  • Aggregation State: HELICAL ARRAY 
  • Reconstruction Method: HELICAL 

Starting Model: experimental
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wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Structural insights into influenza A virus ribonucleoproteins reveal a processive helical track as transcription mechanism.

Coloma, R.Arranz, R.de la Rosa-Trevin, J.M.Sorzano, C.O.S.Munier, S.Carlero, D.Naffakh, N.Ortin, J.Martin-Benito, J.

(2020) Nat Microbiol 5: 727-734

  • DOI: https://doi.org/10.1038/s41564-020-0675-3
  • Primary Citation of Related Structures:  
    6H9G, 6I54, 6I7B, 6I7M, 6I85

  • PubMed Abstract: 

    The influenza virus genome consists of eight viral ribonucleoproteins (vRNPs), each consisting of a copy of the polymerase, one of the genomic RNA segments and multiple copies of the nucleoprotein arranged in a double helical conformation. vRNPs are macromolecular machines responsible for messenger RNA synthesis and genome replication, that is, the formation of progeny vRNPs. Here, we describe the structural basis of the transcription process. The mechanism, which we call the 'processive helical track', is based on the extreme flexibility of the helical part of the vRNP that permits a sliding movement between both antiparallel nucleoprotein-RNA strands, thereby allowing the polymerase to move over the genome while bound to both RNA ends. Accordingly, we demonstrate that blocking this movement leads to inhibition of vRNP transcriptional activity. This mechanism also reveals a critical role of the nucleoprotein in maintaining the double helical structure throughout the copying process to make the RNA template accessible to the polymerase.


  • Organizational Affiliation

    Centro Nacional de Biotecnología, Consejo Superior de Investigaciones Científicas (CSIC), Madrid, Spain.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Nucleoprotein
A, C
469Influenza A virusMutation(s): 0 
UniProt
Find proteins for P15682 (Influenza A virus (strain A/Wilson-Smith/1933 H1N1))
Explore P15682 
Go to UniProtKB:  P15682
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP15682
Sequence Annotations
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  • Reference Sequence

Find similar proteins by:  Sequence   |   3D Structure  

Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Nucleoprotein
B, D
19Influenza A virusMutation(s): 0 
UniProt
Find proteins for P15682 (Influenza A virus (strain A/Wilson-Smith/1933 H1N1))
Explore P15682 
Go to UniProtKB:  P15682
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP15682
Sequence Annotations
Expand
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 10.0 Å
  • Aggregation State: HELICAL ARRAY 
  • Reconstruction Method: HELICAL 
EM Software:
TaskSoftware PackageVersion
RECONSTRUCTIONRELION2.0

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Spanish Ministry of Science, Innovation, and UniversitiesSpainBFU2017-90018-R
Spanish Ministry of Science, Innovation, and UniversitiesSpainBFU2011-25090/BMC

Revision History  (Full details and data files)

  • Version 1.0: 2020-02-12
    Type: Initial release
  • Version 1.1: 2020-08-26
    Changes: Database references
  • Version 1.2: 2024-05-15
    Changes: Data collection, Database references, Refinement description