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- EMDB-54376: Structure of human 1918 influenza A polymerase heterotrimer in co... -

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Basic information

Entry
Database: EMDB / ID: EMD-54376
TitleStructure of human 1918 influenza A polymerase heterotrimer in complex with WSN NEP.
Map data
Sample
  • Complex: Structure of human 1918 influenza A polymerase heterotrimer in complex with WSN NEP
    • Protein or peptide: Polymerase acidic protein
    • Protein or peptide: RNA-directed RNA polymerase catalytic subunit
    • Protein or peptide: Polymerase basic protein 2
    • Protein or peptide: Nuclear export protein
Keywordsinfluenza virus / nuclear export / NEP / NS2 / 1918 polymerase / spanish Flu / viral polymerase / cryo-EM / VIRAL PROTEIN
Function / homology
Function and homology information


exit of virus from host cell nucleus through nuclear pore / cap snatching / viral transcription / symbiont-mediated suppression of host mRNA transcription via inhibition of RNA polymerase II activity / host cell mitochondrion / 7-methylguanosine mRNA capping / symbiont-mediated suppression of host cytoplasmic pattern recognition receptor signaling pathway via inhibition of MAVS activity / virion component / endonuclease activity / Hydrolases; Acting on ester bonds ...exit of virus from host cell nucleus through nuclear pore / cap snatching / viral transcription / symbiont-mediated suppression of host mRNA transcription via inhibition of RNA polymerase II activity / host cell mitochondrion / 7-methylguanosine mRNA capping / symbiont-mediated suppression of host cytoplasmic pattern recognition receptor signaling pathway via inhibition of MAVS activity / virion component / endonuclease activity / Hydrolases; Acting on ester bonds / host cell cytoplasm / symbiont-mediated suppression of host gene expression / viral translational frameshifting / RNA-directed RNA polymerase / viral RNA genome replication / nucleotide binding / RNA-directed RNA polymerase activity / DNA-templated transcription / host cell nucleus / RNA binding / metal ion binding
Similarity search - Function
Influenza nuclear export protein NS2 / Influenza non-structural protein (NS2) / Influenza RNA-dependent RNA polymerase subunit PB2 / PB2, C-terminal / Influenza RNA-dependent RNA polymerase subunit PB1 / Influenza RNA-dependent RNA polymerase subunit PB1 / : / : / Influenza RNA polymerase PB2 N-terminal region / Influenza RNA polymerase PB2 second domain ...Influenza nuclear export protein NS2 / Influenza non-structural protein (NS2) / Influenza RNA-dependent RNA polymerase subunit PB2 / PB2, C-terminal / Influenza RNA-dependent RNA polymerase subunit PB1 / Influenza RNA-dependent RNA polymerase subunit PB1 / : / : / Influenza RNA polymerase PB2 N-terminal region / Influenza RNA polymerase PB2 second domain / : / Influenza RNA polymerase PB2 middle domain / : / Influenza RNA polymerase PB2 C-terminal domain / : / Influenza RNA polymerase PB2 6th domain / : / Influenza RNA polymerase PB2 CAP binding domain / : / Influenza RNA polymerase PB2 helical domain / Polymerase acidic protein / Influenza RNA-dependent RNA polymerase subunit PA / Influenza RNA-dependent RNA polymerase subunit PA, endonuclease domain / Influenza RNA-dependent RNA polymerase subunit PA / RNA-directed RNA polymerase, negative-strand RNA virus / RdRp of negative ssRNA viruses with segmented genomes catalytic domain profile.
Similarity search - Domain/homology
Polymerase acidic protein / RNA-directed RNA polymerase catalytic subunit / Polymerase basic protein 2 / Nuclear export protein
Similarity search - Component
Biological speciesInfluenza A virus (A/Brevig Mission/1/1918(H1N1))
Methodsingle particle reconstruction / cryo EM / Resolution: 2.93 Å
AuthorsRep A / Wang F / Chen K / Carrique L / Grimes JM / Fodor M
Funding support United Kingdom, 8 items
OrganizationGrant numberCountry
Wellcome Trust200835/Z/16/Z United Kingdom
Wellcome Trust222510/Z/21/Z United Kingdom
Medical Research Council (MRC, United Kingdom)MR/R009945/1 United Kingdom
Medical Research Council (MRC, United Kingdom)MR/X008312/1 United Kingdom
Wellcome Trust093305/Z/10/Z United Kingdom
Wellcome Trust060208/Z/00/Z United Kingdom
Wellcome Trust203141/Z/16/Z United Kingdom
Wellcome Trust227570/Z/23/Z United Kingdom
CitationJournal: To Be Published
Title: Structure of human 1918 influenza A polymerase heterotrimer in complex with WSN NEP.
Authors: Rep A / Wang F / Chen K / Carrique L / Grimes JM / Fodor M
History
DepositionJul 15, 2025-
Header (metadata) releaseDec 24, 2025-
Map releaseDec 24, 2025-
UpdateDec 24, 2025-
Current statusDec 24, 2025Processing site: PDBe / Status: Released

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Structure visualization

Supplemental images

emd_54376.png

Downloads & links

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Map

FileDownload / File: emd_54376.map.gz / Format: CCP4 / Size: 103 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
1.24 Å/pix.
x 300 pix.
= 372.81 Å		1.24 Å/pix.
x 300 pix.
= 372.81 Å		1.24 Å/pix.
x 300 pix.
= 372.81 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 1.2427 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.235
Minimum - Maximum-1.0850648 - 1.6763912
Average (Standard dev.)0.00027668392 (±0.044142947)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions300300300
Spacing300300300
CellA=B=C: 372.81 Å
α=β=γ: 90.0 °

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Supplemental data

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Mask #1

Fileemd_54376_msk_1.map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: #1

Fileemd_54376_half_map_1.map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: #2

Fileemd_54376_half_map_2.map
Projections & Slices
AxesZYX

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Slices (1/2)
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Histogram

Histogram (log scale)

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Sample components

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Entire : Structure of human 1918 influenza A polymerase heterotrimer in co...

EntireName: Structure of human 1918 influenza A polymerase heterotrimer in complex with WSN NEP
Components
  • Complex: Structure of human 1918 influenza A polymerase heterotrimer in complex with WSN NEP
    • Protein or peptide: Polymerase acidic protein
    • Protein or peptide: RNA-directed RNA polymerase catalytic subunit
    • Protein or peptide: Polymerase basic protein 2
    • Protein or peptide: Nuclear export protein

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Supramolecule #1: Structure of human 1918 influenza A polymerase heterotrimer in co...

SupramoleculeName: Structure of human 1918 influenza A polymerase heterotrimer in complex with WSN NEP
type: complex / ID: 1 / Parent: 0 / Macromolecule list: all
Source (natural)Organism: Influenza A virus (A/Brevig Mission/1/1918(H1N1))
Molecular weightTheoretical: 283 KDa

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Macromolecule #1: Polymerase acidic protein

MacromoleculeName: Polymerase acidic protein / type: protein_or_peptide / ID: 1 / Number of copies: 1 / Enantiomer: LEVO / EC number: Hydrolases; Acting on ester bonds
Source (natural)Organism: Influenza A virus (A/Brevig Mission/1/1918(H1N1))
Molecular weightTheoretical: 82.707391 KDa
Recombinant expressionOrganism: Spodoptera frugiperda (fall armyworm)
SequenceString: MEDFVRQCFN PMIVELAEKA MKEYGEDLKI ETNKFAAICT HLEVCFMYSD FHFINERGES IIVESGDPNA LLKHRFEIIE GRDRTMAWT VVNSICNTTG AEKPKFLPDL YDYKENRFIE IGVTRREVHI YYLEKANKIK SEKTHIHIFS FTGEEMATKA D YTLDEESR ...String:
MEDFVRQCFN PMIVELAEKA MKEYGEDLKI ETNKFAAICT HLEVCFMYSD FHFINERGES IIVESGDPNA LLKHRFEIIE GRDRTMAWT VVNSICNTTG AEKPKFLPDL YDYKENRFIE IGVTRREVHI YYLEKANKIK SEKTHIHIFS FTGEEMATKA D YTLDEESR ARIKTRLFTI RQEMASRGLW DSFRQSERGE ETIEERFEIT GTMRRLADQS LPPNFSSLEN FRAYVDGFEP NG YIEGKLS QMSKEVNARI EPFLKTTPRP LRLPDGPPCS QRSKFLLMDA LKLSIEDPSH EGEGIPLYDA IKCMRTFFGW KEP NVVKPH EKGINPNYLL AWKQVLAELQ DIENEEKIPK TKNMKKTSQL KWALGENMAP EKVDFDDCKD VSDLKQYDSD EPEL RSLAS WIQSEFNKAC ELTDSSWIEL DEIGEDVAPI EHIASMRRNY FTAEVSHCRA TEYIMKGVYI NTALLNASCA AMDDF QLIP MISKCRTKEG RRKTNLYGFI IKGRSHLRND TDVVNFVSME FSLTDPRLEP HKWEKYCVLE IGDMLLRSAI GQVSRP MFL YVRTNGTSKI KMKWGMEMRR CLLQSLQQIE SMIEAESSVK EKDMTKEFFE NKSETWPIGE SPKGVEEGSI GKVCRTL LA KSVFNSLYAS PQLEGFSAES RKLLLIVQAL RDNLEPGTFD LGGLYEAIEE CLINDPWVLL NASWFNSFLT HALR

UniProtKB: Polymerase acidic protein

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Macromolecule #2: RNA-directed RNA polymerase catalytic subunit

MacromoleculeName: RNA-directed RNA polymerase catalytic subunit / type: protein_or_peptide / ID: 2 / Number of copies: 1 / Enantiomer: LEVO / EC number: RNA-directed RNA polymerase
Source (natural)Organism: Influenza A virus (A/Brevig Mission/1/1918(H1N1))
Molecular weightTheoretical: 86.625211 KDa
Recombinant expressionOrganism: Spodoptera frugiperda (fall armyworm)
SequenceString: MDVNPTLLFL KVPAQNAIST TFPYTGDPPY SHGTGTGYTM DTVNRTHQYS EKGRWTTNTE TGAPQLNPID GPLPEDNEPS GYAQTDCVL EAMAFLEESH PGIFENSCLE TMEVVQQTRV DKLTQGRQTY DWTLNRNQPA ATALANTIEV FRSNGLTANE S GRLIDFLK ...String:
MDVNPTLLFL KVPAQNAIST TFPYTGDPPY SHGTGTGYTM DTVNRTHQYS EKGRWTTNTE TGAPQLNPID GPLPEDNEPS GYAQTDCVL EAMAFLEESH PGIFENSCLE TMEVVQQTRV DKLTQGRQTY DWTLNRNQPA ATALANTIEV FRSNGLTANE S GRLIDFLK DVMESMDKEE MEITTHFQRK RRVRDNMTKK MVTQRTIGKK KQRLNKRSYL IRALTLNTMT KDAERGKLKR RA IATPGMQ IRGFVYFVET LARSICEKLE QSGLPVGGNE KKAKLANVVR KMMTNSQDTE LSFTITGDNT KWNENQNPRM FLA MITYIT RNQPEWFRNV LSIAPIMFSN KMARLGKGYM FESKSMKLRT QIPAEMLASI DLKYFNDSTR KKIEKIRPLL IDGT ASLSP GMMMGMFNML STVLGVSILN LGQKRYTKTT YWWDGLQSSD DFALIVNAPN HEGIQAGVDR FYRTCKLLGI NMSKK KSYI NRTGTFEFTS FFYRYGFVAN FSMELPSFGV SGINESADMS IGVTVIKNNM INNDLGPATA QMALQLFIKD YRYTYR CHR GDTQIQTRRS FEIKKLWEQT RSKAGLLVSD GGPNLYNIRN LHIPEVCLKW ELMDEDYQGR LCNPLNPFVS HKEIESV NN AVMMPAHGPA KNMEYDAVAT THSWIPKRNR SILNTSQRGI LEDEQMYQKC CNLFEKFFPS SSYRRPVGIS SMVEAMVS R ARIDARIDFE SGRIKKEEFA EIMKICSTIE ELRRQK

UniProtKB: RNA-directed RNA polymerase catalytic subunit

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Macromolecule #3: Polymerase basic protein 2

MacromoleculeName: Polymerase basic protein 2 / type: protein_or_peptide / ID: 3 / Details: PB2 plus the remaining TEV cleavage site / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Influenza A virus (A/Brevig Mission/1/1918(H1N1))
Molecular weightTheoretical: 86.849133 KDa
Recombinant expressionOrganism: Spodoptera frugiperda (fall armyworm)
SequenceString: MERIKELRDL MSQSRTREIL TKTTVDHMAI IKKYTSGRQE KNPALRMKWM MAMKYPITAD KRIMEMIPER NEQGQTLWSK TNDAGSDRV MVSPLAVTWW NRNGPTTSAV HYPKIYKTYF EKVERLKHGT FGPVHFRNQV KIRRRVDINP GHADLSAKEA Q DVIMEVVF ...String:
MERIKELRDL MSQSRTREIL TKTTVDHMAI IKKYTSGRQE KNPALRMKWM MAMKYPITAD KRIMEMIPER NEQGQTLWSK TNDAGSDRV MVSPLAVTWW NRNGPTTSAV HYPKIYKTYF EKVERLKHGT FGPVHFRNQV KIRRRVDINP GHADLSAKEA Q DVIMEVVF PNEVGARILT SESQLTITKE KKEELQDCKI SPLMVAYMLE RELVRKTRFL PVAGGTSSVY IEVLHLTQGT CW EQMYTPG GEVRNDDVDQ SLIIAARNIV RRATVSADPL ASLLEMCHST QIGGIRMVDI LRQNPTEEQA VDICKAAMGL RIS SSFSFG GFTFKRTSGS SVKREEEVLT GNLQTLKIRV HEGYEEFTMV GRRATAILRK ATRRLIQLIV SGRDEQSIAE AIIV AMVFS QEDCMIKAVR GDLNFVNRAN QRLNPMHQLL RHFQKDAKVL FQNWGIEPID NVMGMIGILP DMTPSTEMSM RGVRV SKMG VDEYSSTERV VVSIDRFLRV RDQRGNVLLS PEEVSETQGT EKLTITYSSS MMWEVNGPES VLVNTYQWII RNWETV KIQ WSQNPTMLYN KMEFEPFQSL VPKAARGQYS GFVRTLFQQM RDVLGTFDTV QIIKLLPFAA APPKQSRMQF SSLTVNV RG SGMRILVRGN SPVFNYNKAT KRLTVLGKDA GALTEDPDEG TAGVESAVLR GFLILGKEDR RYGPALSINE LSNLAKGE K ANVLIGQGDV VLVMKRKRDS SILTDSQTAT KRIRMAINEN LYFQ

UniProtKB: Polymerase basic protein 2

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Macromolecule #4: Nuclear export protein

MacromoleculeName: Nuclear export protein / type: protein_or_peptide / ID: 4 / Details: GST-3C-NEP fusion protein / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Influenza A virus (A/Brevig Mission/1/1918(H1N1))
Molecular weightTheoretical: 15.221367 KDa
Recombinant expressionOrganism: Escherichia coli BL21(DE3) (bacteria)
SequenceString:
GPLGSPEFCM DSNTVSSFQD ILMRMSKMQL GSSSEDLNGI ITQFESLKLY RDSLGEAVMR MGDLHSLQNR NGKWREQLGQ KFEEIRWLI EEVRHRLKIT ENSFEQITFM QALQLLLEVE QEIRTFSFQL I

UniProtKB: Nuclear export protein

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Experimental details

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Structure determination

Methodcryo EM
Processingsingle particle reconstruction
Aggregation stateparticle

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Sample preparation

Concentration0.33 mg/mL
BufferpH: 7.5 / Component:
ConcentrationName
25.0 mMHEPES
150.0 mMNaCl
GridModel: Quantifoil R2/1 / Material: COPPER / Mesh: 200 / Support film - Material: CARBON / Support film - topology: HOLEY
VitrificationCryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 277 K / Instrument: FEI VITROBOT MARK IV

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Electron microscopy

MicroscopeTFS KRIOS
Specialist opticsEnergy filter - Name: TFS Selectris X / Energy filter - Slit width: 10 eV
Image recordingFilm or detector model: TFS FALCON 4i (4k x 4k) / Average electron dose: 50.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsC2 aperture diameter: 50.0 µm / Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Cs: 2.7 mm / Nominal defocus max: 24.0 µm / Nominal defocus min: 5.0 µm
Sample stageSpecimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER / Cooling holder cryogen: NITROGEN
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

CTF correctionSoftware - Name: cryoSPARC (ver. 4.2 - 4.7) / Type: PHASE FLIPPING AND AMPLITUDE CORRECTION
Startup modelType of model: INSILICO MODEL / In silico model: AF3
Final reconstructionNumber classes used: 1 / Applied symmetry - Point group: C1 (asymmetric) / Resolution.type: BY AUTHOR / Resolution: 2.93 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: cryoSPARC (ver. 4.2 - 4.7) / Number images used: 35000
Initial angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: cryoSPARC (ver. 4.2 - 4.7)
Final angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: cryoSPARC (ver. 4.2 - 4.7)
Final 3D classificationNumber classes: 10 / Avg.num./class: 17000 / Software - Name: cryoSPARC (ver. 4.2 - 4.7)
FSC plot (resolution estimation)

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Atomic model buiding 1

Initial modelChain - Source name: AlphaFold / Chain - Initial model type: in silico model
RefinementSpace: REAL / Protocol: RIGID BODY FIT
Output model

PDB-9ryc:
Structure of human 1918 influenza A polymerase heterotrimer in complex with WSN NEP.

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