8RN8

Influenza B polymerase pseudo-symmetrical apo-dimer (FluPol(E)|FluPol(S))


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 2.92 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.0 of the entry. See complete history


Literature

Structures of influenza A and B replication complexes give insight into avian to human host adaptation and reveal a role of ANP32 as an electrostatic chaperone for the apo-polymerase.

Arragain, B.Krischuns, T.Pelosse, M.Drncova, P.Blackledge, M.Naffakh, N.Cusack, S.

(2024) Nat Commun 15: 6910-6910

  • DOI: https://doi.org/10.1038/s41467-024-51007-3
  • Primary Citation of Related Structures:  
    8RMP, 8RMQ, 8RMR, 8RMS, 8RN0, 8RN1, 8RN2, 8RN3, 8RN4, 8RN5, 8RN6, 8RN7, 8RN8, 8RN9, 8RNA, 8RNB, 8RNC

  • PubMed Abstract: 

    Replication of influenza viral RNA depends on at least two viral polymerases, a parental replicase and an encapsidase, and cellular factor ANP32. ANP32 comprises an LRR domain and a long C-terminal low complexity acidic region (LCAR). Here we present evidence suggesting that ANP32 is recruited to the replication complex as an electrostatic chaperone that stabilises the encapsidase moiety within apo-polymerase symmetric dimers that are distinct for influenza A and B polymerases. The ANP32 bound encapsidase, then forms the asymmetric replication complex with the replicase, which is embedded in a parental ribonucleoprotein particle (RNP). Cryo-EM structures reveal the architecture of the influenza A and B replication complexes and the likely trajectory of the nascent RNA product into the encapsidase. The cryo-EM map of the FluB replication complex shows extra density attributable to the ANP32 LCAR wrapping around and stabilising the apo-encapsidase conformation. These structures give new insight into the various mutations that adapt avian strain polymerases to use the distinct ANP32 in mammalian cells.


  • Organizational Affiliation

    European Molecular Biology Laboratory, Grenoble, Cedex 9, France.


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Polymerase acidic protein
A, D
726Influenza B virus (B/Memphis/13/2003)Mutation(s): 0 
Gene Names: PA
EC: 3.1
UniProt
Find proteins for Q5V8Z9 (Influenza B virus)
Explore Q5V8Z9 
Go to UniProtKB:  Q5V8Z9
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UniProt GroupQ5V8Z9
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  • Reference Sequence
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
RNA-directed RNA polymerase catalytic subunit
B, E
752Influenza B virus (B/Memphis/13/2003)Mutation(s): 0 
Gene Names: PB1
EC: 2.7.7.48
UniProt
Find proteins for Q5V8Y6 (Influenza B virus)
Explore Q5V8Y6 
Go to UniProtKB:  Q5V8Y6
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UniProt GroupQ5V8Y6
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  • Reference Sequence
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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
Polymerase basic protein 2
C, F
799Influenza B virus (B/Memphis/13/2003)Mutation(s): 0 
Gene Names: PB2
UniProt
Find proteins for Q5V8X3 (Influenza B virus)
Explore Q5V8X3 
Go to UniProtKB:  Q5V8X3
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UniProt GroupQ5V8X3
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 2.92 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 
EM Software:
TaskSoftware PackageVersion
RECONSTRUCTIONcryoSPARC

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Agence Nationale de la Recherche (ANR)FranceANR-18-CE18-0028

Revision History  (Full details and data files)

  • Version 1.0: 2024-09-11
    Type: Initial release