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- EMDB-12348: 1918 H1N1 Viral influenza polymerase heterotrimer - Replicase (cl... -

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Basic information

Entry
Database: EMDB / ID: EMD-12348
Title1918 H1N1 Viral influenza polymerase heterotrimer - Replicase (class 3)
Map dataOriginal unsharpened map from cryoSPARC
Sample
  • Complex: 1918 Influenza virus polymerase heterotirmer in complex with vRNA promoters
    • Complex: Polymerase acidic protein
      • Protein or peptide: Polymerase acidic protein
    • Complex: RNA-directed RNA polymerase catalytic subunit
      • Protein or peptide: RNA-directed RNA polymerase catalytic subunit
    • Complex: Polymerase basic protein 2
      • Protein or peptide: Polymerase basic protein 2,Immunoglobulin G-binding protein A
    • Complex: RNA
      • RNA: RNA (5'-R(P*GP*GP*CP*CP*UP*GP*CP*U)-3')
      • RNA: RNA (5'-R(P*AP*GP*UP*AP*GP*AP*AP*AP*CP*AP*AP*GP*GP*CP*C)-3')
KeywordsInfluenza / RNA polymerase / H1N1 / 1918 / VIRAL PROTEIN
Function / homology
Function and homology information


IgG binding / 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 / host cell cytoplasm ...IgG binding / 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 / host cell cytoplasm / Hydrolases; Acting on ester bonds / RNA-directed RNA polymerase / viral translational frameshifting / viral RNA genome replication / RNA-dependent RNA polymerase activity / virus-mediated perturbation of host defense response / nucleotide binding / DNA-templated transcription / host cell nucleus / RNA binding / extracellular region / metal ion binding
Similarity search - Function
Octapeptide repeat / Octapeptide repeat / Protein A, Ig-binding domain / B domain / LysM domain superfamily / Lysin motif / LysM domain / LysM domain profile. / Influenza RNA-dependent RNA polymerase subunit PB2 / LysM domain ...Octapeptide repeat / Octapeptide repeat / Protein A, Ig-binding domain / B domain / LysM domain superfamily / Lysin motif / LysM domain / LysM domain profile. / Influenza RNA-dependent RNA polymerase subunit PB2 / LysM domain / 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 / Immunoglobulin/albumin-binding domain superfamily / : / Influenza RNA polymerase PB2 CAP binding domain / : / Influenza RNA polymerase PB2 helical domain / YSIRK type signal peptide / 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 / YSIRK Gram-positive signal peptide / RNA-directed RNA polymerase, negative-strand RNA virus / RdRp of negative ssRNA viruses with segmented genomes catalytic domain profile. / LPXTG cell wall anchor motif / Gram-positive cocci surface proteins LPxTG motif profile. / LPXTG cell wall anchor domain
Similarity search - Domain/homology
Immunoglobulin G-binding protein A / Polymerase acidic protein / RNA-directed RNA polymerase catalytic subunit / Polymerase basic protein 2
Similarity search - Component
Biological speciesInfluenza A virus (strain A/Brevig Mission/1/1918 H1N1) / Staphylococcus aureus (bacteria) / Influenza A virus (A/Brevig Mission/1/1918(H1N1))
Methodsingle particle reconstruction / cryo EM / Resolution: 3.32 Å
AuthorsKeown JR / Carrique L
Funding support United Kingdom, 3 items
OrganizationGrant numberCountry
Wellcome Trust200835/Z/16/Z United Kingdom
Medical Research Council (MRC, United Kingdom)MR/R009945/1 United Kingdom
Medical Research Council (MRC, United Kingdom)MR/K000241/1 United Kingdom
CitationJournal: Nat Commun / Year: 2022
Title: Mapping inhibitory sites on the RNA polymerase of the 1918 pandemic influenza virus using nanobodies.
Authors: Jeremy R Keown / Zihan Zhu / Loïc Carrique / Haitian Fan / Alexander P Walker / Itziar Serna Martin / Els Pardon / Jan Steyaert / Ervin Fodor / Jonathan M Grimes /
Abstract: Influenza A viruses cause seasonal epidemics and global pandemics, representing a considerable burden to healthcare systems. Central to the replication cycle of influenza viruses is the viral RNA- ...Influenza A viruses cause seasonal epidemics and global pandemics, representing a considerable burden to healthcare systems. Central to the replication cycle of influenza viruses is the viral RNA-dependent RNA polymerase which transcribes and replicates the viral RNA genome. The polymerase undergoes conformational rearrangements and interacts with viral and host proteins to perform these functions. Here we determine the structure of the 1918 influenza virus polymerase in transcriptase and replicase conformations using cryo-electron microscopy (cryo-EM). We then structurally and functionally characterise the binding of single-domain nanobodies to the polymerase of the 1918 pandemic influenza virus. Combining these functional and structural data we identify five sites on the polymerase which are sensitive to inhibition by nanobodies. We propose that the binding of nanobodies at these sites either prevents the polymerase from assuming particular functional conformations or interactions with viral or host factors. The polymerase is highly conserved across the influenza A subtypes, suggesting these sites as effective targets for potential influenza antiviral development.
History
DepositionFeb 11, 2021-
Header (metadata) releaseDec 1, 2021-
Map releaseDec 1, 2021-
UpdateJul 10, 2024-
Current statusJul 10, 2024Processing site: PDBe / Status: Released

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Structure visualization

Movie
  • Surface view with section colored by density value
  • Surface level: 0.0526
  • Imaged by UCSF Chimera
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  • Surface view colored by radius
  • Surface level: 0.0526
  • Imaged by UCSF Chimera
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  • Surface view with fitted model
  • Atomic models: PDB-7ni0
  • Surface level: 0.0526
  • Imaged by UCSF Chimera
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Movie viewer
Structure viewerEM map:
SurfViewMolmilJmol/JSmol
Supplemental images

emd_12348.png

Downloads & links

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Map

FileDownload / File: emd_12348.map.gz / Format: CCP4 / Size: 64 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
AnnotationOriginal unsharpened map from cryoSPARC
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
0.83 Å/pix.
x 256 pix.
= 211.2 Å		0.83 Å/pix.
x 256 pix.
= 211.2 Å		0.83 Å/pix.
x 256 pix.
= 211.2 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 0.825 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.0526 / Movie #1: 0.0526
Minimum - Maximum-0.1523424 - 0.35551956
Average (Standard dev.)0.0018116898 (±0.017130625)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions256256256
Spacing256256256
CellA=B=C: 211.2 Å
α=β=γ: 90.0 °

CCP4 map header:

modeImage stored as Reals
Å/pix. X/Y/Z0.8250.8250.825
M x/y/z256256256
origin x/y/z0.0000.0000.000
length x/y/z211.200211.200211.200
α/β/γ90.00090.00090.000
start NX/NY/NZ000
NX/NY/NZ384384384
MAP C/R/S123
start NC/NR/NS000
NC/NR/NS256256256
D min/max/mean-0.1520.3560.002

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Supplemental data

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Additional map: Map generated by deepEMhancer using the wideTarget function.

Fileemd_12348_additional_1.map
AnnotationMap generated by deepEMhancer using the wideTarget function.
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Sample components

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Entire : 1918 Influenza virus polymerase heterotirmer in complex with vRNA...

EntireName: 1918 Influenza virus polymerase heterotirmer in complex with vRNA promoters
Components
  • Complex: 1918 Influenza virus polymerase heterotirmer in complex with vRNA promoters
    • Complex: Polymerase acidic protein
      • Protein or peptide: Polymerase acidic protein
    • Complex: RNA-directed RNA polymerase catalytic subunit
      • Protein or peptide: RNA-directed RNA polymerase catalytic subunit
    • Complex: Polymerase basic protein 2
      • Protein or peptide: Polymerase basic protein 2,Immunoglobulin G-binding protein A
    • Complex: RNA
      • RNA: RNA (5'-R(P*GP*GP*CP*CP*UP*GP*CP*U)-3')
      • RNA: RNA (5'-R(P*AP*GP*UP*AP*GP*AP*AP*AP*CP*AP*AP*GP*GP*CP*C)-3')

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Supramolecule #1: 1918 Influenza virus polymerase heterotirmer in complex with vRNA...

SupramoleculeName: 1918 Influenza virus polymerase heterotirmer in complex with vRNA promoters
type: complex / ID: 1 / Parent: 0 / Macromolecule list: all

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Supramolecule #2: Polymerase acidic protein

SupramoleculeName: Polymerase acidic protein / type: complex / ID: 2 / Parent: 1 / Macromolecule list: #1
Source (natural)Organism: Influenza A virus (strain A/Brevig Mission/1/1918 H1N1)

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Supramolecule #3: RNA-directed RNA polymerase catalytic subunit

SupramoleculeName: RNA-directed RNA polymerase catalytic subunit / type: complex / ID: 3 / Parent: 1 / Macromolecule list: #2
Source (natural)Organism: Influenza A virus (strain A/Brevig Mission/1/1918 H1N1)

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Supramolecule #4: Polymerase basic protein 2

SupramoleculeName: Polymerase basic protein 2 / type: complex / ID: 4 / Parent: 1 / Macromolecule list: #3
Source (natural)Organism: Influenza A virus (strain A/Brevig Mission/1/1918 H1N1)

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Supramolecule #5: RNA

SupramoleculeName: RNA / type: complex / ID: 5 / Parent: 1 / Macromolecule list: #4-#5
Source (natural)Organism: Influenza A virus (strain A/Brevig Mission/1/1918 H1N1)
Synthetically produced: Yes

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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 (strain A/Brevig Mission/1/1918 H1N1)
Strain: 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 (strain A/Brevig Mission/1/1918 H1N1)
Strain: 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,Immunoglobulin G-binding protein A

MacromoleculeName: Polymerase basic protein 2,Immunoglobulin G-binding protein A
type: protein_or_peptide / ID: 3 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Staphylococcus aureus (bacteria)
Molecular weightTheoretical: 102.377219 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 LYFQGELKTA ALAQHDEAVD NKFNKEQQNA FYEILHLPN LNEEQRNAFI QSLKDDPSQS ANLLAEAKKL NDAQAPKVDN KFNKEQQNAF YEILHLPNLN EEQRNAFIQS LKADPSQSAN LLAEAKKLN GAQAPKVDAN SAGKST

UniProtKB: Polymerase basic protein 2, Immunoglobulin G-binding protein A

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Macromolecule #4: RNA (5'-R(P*GP*GP*CP*CP*UP*GP*CP*U)-3')

MacromoleculeName: RNA (5'-R(P*GP*GP*CP*CP*UP*GP*CP*U)-3') / type: rna / ID: 4 / Number of copies: 1
Source (natural)Organism: Influenza A virus (A/Brevig Mission/1/1918(H1N1))
Molecular weightTheoretical: 5.335125 KDa
SequenceString:
GGCCUGCUUU UGCUAUU

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Macromolecule #5: RNA (5'-R(P*AP*GP*UP*AP*GP*AP*AP*AP*CP*AP*AP*GP*GP*CP*C)-3')

MacromoleculeName: RNA (5'-R(P*AP*GP*UP*AP*GP*AP*AP*AP*CP*AP*AP*GP*GP*CP*C)-3')
type: rna / ID: 5 / Number of copies: 1
Source (natural)Organism: Influenza A virus (A/Brevig Mission/1/1918(H1N1))
Molecular weightTheoretical: 4.862017 KDa
SequenceString:
AGUAGAAACA AGGCC

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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

Concentration0.3 mg/mL
BufferpH: 7.5
Component:
ConcentrationFormulaName
25.0 mMNaSCNSodium thiocynate
20.0 mMHEPES-NaHEPES
166.0 mMNaClSodium Chloride
0.0075 % (v/v)Tween 20
VitrificationCryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 298 K / Instrument: FEI VITROBOT MARK IV / Details: 3.5 second blot and 3 microlitres sample..

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Electron microscopy

MicroscopeTFS KRIOS
Image recordingFilm or detector model: GATAN K2 SUMMIT (4k x 4k) / Detector mode: COUNTING / Digitization - Dimensions - Width: 3838 pixel / Digitization - Dimensions - Height: 3710 pixel / Number grids imaged: 1 / Number real images: 9413 / Average exposure time: 5.0 sec. / Average electron dose: 61.5 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Cs: 2.7 mm / Nominal magnification: 165000
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

Particle selectionNumber selected: 2854501
Details: Initial automated blob picking followed by template picking.
Startup modelType of model: INSILICO MODEL
Final reconstructionResolution.type: BY AUTHOR / Resolution: 3.32 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: cryoSPARC (ver. 2.15) / Number images used: 32398
Initial angle assignmentType: RANDOM ASSIGNMENT / Software - Name: cryoSPARC (ver. 2.15)
Final angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: cryoSPARC (ver. 2.15) / Details: Non-uniform refinement
FSC plot (resolution estimation)

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Atomic model buiding 1

Initial model
PDB IDChain

7hna

source_name: PDB, initial_model_type: experimental model

6qnw

source_name: PDB, initial_model_type: experimental model
RefinementProtocol: FLEXIBLE FIT
Output model

PDB-7ni0:
1918 H1N1 Viral influenza polymerase heterotrimer - Replicase (class 3)

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