6XZD

Influenza C virus polymerase complex without chicken ANP32A - Subclass 2

Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.40 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

Host ANP32A mediates the assembly of the influenza virus replicase.

Carrique, L., Fan, H., Walker, A.P., Keown, J.R., Sharps, J., Staller, E., Barclay, W.S., Fodor, E., Grimes, J.M.

(2020) Nature 587: 638-643

  • DOI: 10.1038/s41586-020-2927-z
  • Primary Citation of Related Structures:  
    6XZD, 6XZG, 6XZP, 6XZQ, 6XZR, 6Y0C

  • PubMed Abstract: 

    • Aquatic birds represent a vast reservoir from which new pandemic influenza A viruses can emerge 1 . Influenza viruses contain a negative-sense segmented RNA genome that is transcribed and replicated by the viral heterotrimeric RNA polymerase (FluPol) in the context of viral ribonucleoprotein complexes 2,3 ...

    Aquatic birds represent a vast reservoir from which new pandemic influenza A viruses can emerge 1 . Influenza viruses contain a negative-sense segmented RNA genome that is transcribed and replicated by the viral heterotrimeric RNA polymerase (FluPol) in the context of viral ribonucleoprotein complexes 2,3 . RNA polymerases of avian influenza A viruses (FluPolA) replicate viral RNA inefficiently in human cells because of species-specific differences in acidic nuclear phosphoprotein 32 (ANP32), a family of essential host proteins for FluPol activity 4 . Host-adaptive mutations, particularly a glutamic-acid-to-lysine mutation at amino acid residue 627 (E627K) in the 627 domain of the PB2 subunit, enable avian FluPolA to overcome this restriction and efficiently replicate viral RNA in the presence of human ANP32 proteins. However, the molecular mechanisms of genome replication and the interplay with ANP32 proteins remain largely unknown. Here we report cryo-electron microscopy structures of influenza C virus polymerase (FluPolC) in complex with human and chicken ANP32A. In both structures, two FluPolC molecules form an asymmetric dimer bridged by the N-terminal leucine-rich repeat domain of ANP32A. The C-terminal low-complexity acidic region of ANP32A inserts between the two juxtaposed PB2 627 domains of the asymmetric FluPolA dimer, suggesting a mechanism for how the adaptive PB2(E627K) mutation enables the replication of viral RNA in mammalian hosts. We propose that this complex represents a replication platform for the viral RNA genome, in which one of the FluPol molecules acts as a replicase while the other initiates the assembly of the nascent replication product into a viral ribonucleoprotein complex.

    Organizational Affiliation: 

    Diamond Light Source Ltd, Harwell Science and Innovation Campus, Didcot, UK. jonathan@strubi.ox.ac.uk.



Macromolecules

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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Polymerase acidic proteinB [auth AP1],
E [auth DP1]		709Influenza C virus (C/Johannesburg/1/66)Mutation(s): 0 
Gene Names: PA, P3
EC: 3.1
UniProt
Find proteins for Q9IMP5 (Influenza C virus (strain C/Johannesburg/1/1966))
Explore Q9IMP5 
Go to UniProtKB:  Q9IMP5
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UniProt GroupQ9IMP5
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
RNA-directed RNA polymerase catalytic subunitC [auth BP1],
F [auth EP1]		754Influenza C virus (C/Johannesburg/1/66)Mutation(s): 0 
Gene Names: PB1
EC: 2.7.7.48
UniProt
Find proteins for Q9IMP4 (Influenza C virus (strain C/Johannesburg/1/1966))
Explore Q9IMP4 
Go to UniProtKB:  Q9IMP4
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UniProt GroupQ9IMP4
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Entity ID: 4
MoleculeChainsSequence LengthOrganismDetailsImage
Polymerase basic protein 2D [auth CP1],
G [auth FP1]		774Influenza C virus (C/Johannesburg/1/66)Mutation(s): 0 
Gene Names: PB2
UniProt
Find proteins for Q9IMP3 (Influenza C virus (strain C/Johannesburg/1/1966))
Explore Q9IMP3 
Go to UniProtKB:  Q9IMP3
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UniProt GroupQ9IMP3
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Entity ID: 1
MoleculeChainsLengthOrganismImage
RNA (5'-R(*AP*GP*UP*AP*GP*AP*AP*AP*CP*AP*AP*GP*GP*GP*CP*CP*CP*UP*GP*C)-3')A [auth IN1]47synthetic construct
Protein Feature View
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Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.40 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 
EM Software:
TaskSoftware PackageVersion
RECONSTRUCTIONRELION3.1
MODEL REFINEMENTPHENIX1.17

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Wellcome TrustUnited Kingdom200835/Z/16/Z
Medical Research Council (MRC, United Kingdom)United KingdomMR/R009945/1
Medical Research Council (MRC, United Kingdom)United KingdomMR/K000241/1

Revision History  (Full details and data files)

  • Version 1.0: 2020-12-23
    Type: Initial release