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- EMDB-4512: Influenza B polymerase elongation complex -

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Basic information

Entry
Database: EMDB / ID: EMD-4512
TitleInfluenza B polymerase elongation complex
Map dataInfluenza virus B polymerase elongation complex (LocScale filtered)
Sample
  • Complex: Influenza polzmerase elongation complex
    • Complex: Influenza polzmerase elongation complex
      • Protein or peptide: Polymerase acidic protein
      • Protein or peptide: RNA-directed RNA polymerase catalytic subunit
      • Protein or peptide: Polymerase basic protein 2
    • Complex: Influenza polzmerase elongation complex
      • RNA: 5 end
      • RNA: 3 end
      • RNA: capped RNA
  • Ligand: MAGNESIUM ION
KeywordsInfluenza B Polymerase / Viral protein
Function / homology
Function and homology information


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 / virion component / endonuclease activity / host cell cytoplasm / Hydrolases; Acting on ester bonds / RNA-directed RNA polymerase ...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 / virion component / endonuclease activity / host cell cytoplasm / Hydrolases; Acting on ester bonds / RNA-directed RNA polymerase / viral RNA genome replication / RNA-dependent RNA polymerase activity / nucleotide binding / DNA-templated transcription / host cell nucleus / RNA binding / metal ion binding
Similarity search - Function
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-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 basic protein 2 / RNA-directed RNA polymerase catalytic subunit / Polymerase acidic protein
Similarity search - Component
Biological speciesInfluenza B virus / Influenza B virus (B/Memphis/13/2003)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.2 Å
AuthorsCusack S / Kouba T
CitationJournal: Nat Struct Mol Biol / Year: 2019
Title: Structural snapshots of actively transcribing influenza polymerase.
Authors: Tomas Kouba / Petra Drncová / Stephen Cusack /
Abstract: Influenza virus RNA-dependent RNA polymerase uses unique mechanisms to transcribe its single-stranded genomic viral RNA (vRNA) into messenger RNA. The polymerase is initially bound to a promoter ...Influenza virus RNA-dependent RNA polymerase uses unique mechanisms to transcribe its single-stranded genomic viral RNA (vRNA) into messenger RNA. The polymerase is initially bound to a promoter comprising the partially base-paired 3' and 5' extremities of the RNA. A short, capped primer, 'cap-snatched' from a nascent host polymerase II transcript, is directed towards the polymerase active site to initiate RNA synthesis. Here we present structural snapshots, as determined by X-ray crystallography and cryo-electron microscopy, of actively initiating influenza polymerase as it transitions towards processive elongation. Unexpected conformational changes unblock the active site cavity to allow establishment of a nine-base-pair template-product RNA duplex before the strands separate into distinct exit channels. Concomitantly, as the template translocates, the promoter base pairs are broken and the template entry region is remodeled. These structures reveal details of the influenza polymerase active site that will help optimize nucleoside analogs or other compounds that directly inhibit viral RNA synthesis.
History
DepositionDec 30, 2018-
Header (metadata) releaseApr 24, 2019-
Map releaseJun 5, 2019-
UpdateMay 15, 2024-
Current statusMay 15, 2024Processing site: PDBe / Status: Released

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Structure visualization

Movie
  • Surface view with section colored by density value
  • Surface level: 0.2
  • Imaged by UCSF Chimera
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  • Surface view colored by radius
  • Surface level: 0.2
  • Imaged by UCSF Chimera
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  • Surface view with fitted model
  • Atomic models: PDB-6qct
  • Surface level: 0.2
  • Imaged by UCSF Chimera
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Movie viewer
Structure viewerEM map:
SurfViewMolmilJmol/JSmol
Supplemental images

emd_4512.png

Downloads & links

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Map

FileDownload / File: emd_4512.map.gz / Format: CCP4 / Size: 115.9 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
AnnotationInfluenza virus B polymerase elongation complex (LocScale filtered)
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
0.83 Å/pix.
x 312 pix.
= 259.303 Å		0.83 Å/pix.
x 312 pix.
= 259.303 Å		0.83 Å/pix.
x 312 pix.
= 259.303 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 0.8311 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.2 / Movie #1: 0.2
Minimum - Maximum-0.22205251 - 0.6953146
Average (Standard dev.)0.0030005525 (±0.025531951)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions312312312
Spacing312312312
CellA=B=C: 259.3032 Å
α=β=γ: 90.0 °

CCP4 map header:

modeImage stored as Reals
Å/pix. X/Y/Z0.831099358974360.831099358974360.83109935897436
M x/y/z312312312
origin x/y/z0.0000.0000.000
length x/y/z259.303259.303259.303
α/β/γ90.00090.00090.000
MAP C/R/S123
start NC/NR/NS000
NC/NR/NS312312312
D min/max/mean-0.2220.6950.003

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Supplemental data

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Additional map: Influenza virus B polymerase elongation complex (Relion post-process)

Fileemd_4512_additional.map
AnnotationInfluenza virus B polymerase elongation complex (Relion post-process)
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Sample components

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Entire : Influenza polzmerase elongation complex

EntireName: Influenza polzmerase elongation complex
Components
  • Complex: Influenza polzmerase elongation complex
    • Complex: Influenza polzmerase elongation complex
      • Protein or peptide: Polymerase acidic protein
      • Protein or peptide: RNA-directed RNA polymerase catalytic subunit
      • Protein or peptide: Polymerase basic protein 2
    • Complex: Influenza polzmerase elongation complex
      • RNA: 5 end
      • RNA: 3 end
      • RNA: capped RNA
  • Ligand: MAGNESIUM ION

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Supramolecule #1: Influenza polzmerase elongation complex

SupramoleculeName: Influenza polzmerase elongation complex / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#6

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Supramolecule #2: Influenza polzmerase elongation complex

SupramoleculeName: Influenza polzmerase elongation complex / type: complex / ID: 2 / Parent: 1 / Macromolecule list: #1-#3
Source (natural)Organism: Influenza B virus

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Supramolecule #3: Influenza polzmerase elongation complex

SupramoleculeName: Influenza polzmerase elongation complex / type: complex / ID: 3 / Parent: 1 / Macromolecule list: #4-#6
Source (natural)Organism: Influenza B virus

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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 B virus (B/Memphis/13/2003) / Strain: B/Memphis/13/2003
Molecular weightTheoretical: 85.822781 KDa
Recombinant expressionOrganism: Trichoplusia ni (cabbage looper)
SequenceString: GSHHHHHHHH GSGSMDTFIT RNFQTTIIQK AKNTMAEFSE DPELQPAMLF NICVHLEVCY VISDMNFLDE EGKAYTALEG QGKEQNLRP QYEVIEGMPR TIAWMVQRSL AQEHGIETPK YLADLFDYKT KRFIEVGITK GLADDYFWKK KEKLGNSMEL M IFSYNQDY ...String:
GSHHHHHHHH GSGSMDTFIT RNFQTTIIQK AKNTMAEFSE DPELQPAMLF NICVHLEVCY VISDMNFLDE EGKAYTALEG QGKEQNLRP QYEVIEGMPR TIAWMVQRSL AQEHGIETPK YLADLFDYKT KRFIEVGITK GLADDYFWKK KEKLGNSMEL M IFSYNQDY SLSNESSLDE EGKGRVLSRL TELQAELSLK NLWQVLIGEE DVEKGIDFKL GQTISRLRDI SVPAGFSNFE GM RSYIDNI DPKGAIERNL ARMSPLVSVT PKKLTWEDLR PIGPHIYNHE LPEVPYNAFL LMSDELGLAN MTEGKSKKPK TLA KECLEK YSTLRDQTDP ILIMKSEKAN ENFLWKLWRD CVNTISNEEM SNELQKTNYA KWATGDGLTY QKIMKEVAID DETM CQEEP KIPNKCRVAA WVQTEMNLLS TLTSKRALDL PEIGPDVAPV EHVGSERRKY FVNEINYCKA STVMMKYVLF HTSLL NESN ASMGKYKVIP ITNRVVNEKG ESFDMLYGLA VKGQSHLRGD TDVVTVVTFE FSSTDPRVDS GKWPKYTVFR IGSLFV SGR EKSVYLYCRV NGTNKIQMKW GMEARRCLLQ SMQQMEAIVE QESSIQGYDM TKACFKGDRV NSPKTFSIGT QEGKLVK GS FGKALRVIFT KCLMHYVFGN AQLEGFSAES RRLLLLIQAL KDRKGPWVFD LEGMYSGIEE CISNNPWVIQ SAYWFNEW L GFEKEGSKVL ESVDEIMDEG SGSGENLYFQ

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 B virus
Molecular weightTheoretical: 86.207016 KDa
Recombinant expressionOrganism: Trichoplusia ni (cabbage looper)
SequenceString: GSGSGSGSGM NINPYFLFID VPIQAAISTT FPYTGVPPYS HGTGTGYTID TVIRTHEYSN KGKQYISDVT GCTMVDPTNG PLPEDNEPS AYAQLDCVLE ALDRMDEEHP GLFQAASQNA METLMVTTVD KLTQGRQTFD WTVCRNQPAA TALNTTITSF R LNDLNGAD ...String:
GSGSGSGSGM NINPYFLFID VPIQAAISTT FPYTGVPPYS HGTGTGYTID TVIRTHEYSN KGKQYISDVT GCTMVDPTNG PLPEDNEPS AYAQLDCVLE ALDRMDEEHP GLFQAASQNA METLMVTTVD KLTQGRQTFD WTVCRNQPAA TALNTTITSF R LNDLNGAD KGGLIPFCQD IIDSLDRPEM TFFSVKNIKK KLPAKNRKGF LIKRIPMKVK DKITKVEYIK RALSLNTMTK DA ERGKLKR RAIATAGIQI RGFVLVVENL AKNICENLEQ SGLPVGGNEK KAKLSNAVAK MLSNCPPGGI SMTVTGDNTK WNE CLNPRI FLAMTERITR DSPIWFRDFC SIAPVLFSNK IARLGKGFMI TSKTKRLKAQ IPCPDLFSIP LERYNEETRA KLKK LKPFF NEEGTASLSP GMMMGMFNML STVLGVAALG IKNIGNKEYL WDGLQSSDDF ALFVNAKDEE TCMEGINDFY RTCKL LGIN MSKKKSYCNE TGMFEFTSMF YRDGFVSNFA MELPSFGVAG VNESADMAIG MTIIKNNMIN NGMGPATAQT AIQLFI ADY RYTYKCHRGD SKVEGKRMKI IKELWENTKG RDGLLVADGG PNIYNLRNLH IPEIVLKYNL MDPEYKGRLL HPQNPFV GH LSIEGIKEAD ITPAHGPVKK MDYDAVSGTH SWRTKRNRSI LNTDQRNMIL EEQCYAKCCN LFEACFNSAS YRKPVGQH S MLEAMAHRLR MDARLDYESG RMSKDDFEKA MAHLGEIGYI GSGSGENLYF Q

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 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Influenza B virus (B/Memphis/13/2003) / Strain: B/Memphis/13/2003
Molecular weightTheoretical: 90.844109 KDa
Recombinant expressionOrganism: Trichoplusia ni (cabbage looper)
SequenceString: GSGSGSGSGM TLAKIELLKQ LLRDNEAKTV LKQTTVDQYN IIRKFNTSRI EKNPSLRMKW AMCSNFPLAL TKGDMANRIP LEYKGIQLK TNAEDIGTKG QMCSIAAVTW WNTYGPIGDT EGFERVYESF FLRKMRLDNA TWGRITFGPV ERVRKRVLLN P LTKEMPPD ...String:
GSGSGSGSGM TLAKIELLKQ LLRDNEAKTV LKQTTVDQYN IIRKFNTSRI EKNPSLRMKW AMCSNFPLAL TKGDMANRIP LEYKGIQLK TNAEDIGTKG QMCSIAAVTW WNTYGPIGDT EGFERVYESF FLRKMRLDNA TWGRITFGPV ERVRKRVLLN P LTKEMPPD EASNVIMEIL FPKEAGIPRE STWIHRELIK EKREKLKGTM ITPIVLAYML ERELVARRRF LPVAGATSAE FI EMLHCLQ GENWRQIYHP GGNKLTESRS QSMIVACRKI IRRSIVASNP LELAVEIANK TVIDTEPLKS CLAAIDGGDV ACD IIRAAL GLKIRQRQRF GRLELKRISG RGFKNDEEIL IGNGTIQKIG IWDGEEEFHV RCGECRGILK KSKMKLEKLL INSA KKEDM RDLIILCMVF SQDTRMFQGV RGEINFLNRA GQLLSPMYQL QRYFLNRSND LFDQWGYEES PKASELHGIN ESMNA SDYT LKGVVVTRNV IDDFSSTETE KVSITKNLSL IKRTGEVIMG ANDVSELESQ AQLMITYDTP KMWEMGTTKE LVQNTY QWV LKNLVTLKAQ FLLGKEDMFQ WDAFEAFESI IPQKMAGQYS GFARAVLKQM RDQEVMKTDQ FIKLLPFCFS PPKLRSN GE PYQFLKLVLK GGGENFIEVR KGSPLFSYNP QTEVLTICGR MMSLKGKIED EERNRSMGNA VLAGFLVSGK YDPDLGDF K TIEELEKLKP GEKANILLYQ GKPVKVVKRK RYSALSNDIS QGIKRQRMTV ESMGWALSGW SHPQFEKGSG SENLYFQ

UniProtKB: Polymerase basic protein 2

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Macromolecule #4: 5 end

MacromoleculeName: 5 end / type: rna / ID: 4 / Number of copies: 1
Source (natural)Organism: Influenza B virus
Molecular weightTheoretical: 4.55782 KDa
SequenceString:
AGUAGUAACA AGAG

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Macromolecule #5: 3 end

MacromoleculeName: 3 end / type: rna / ID: 5 / Number of copies: 1
Source (natural)Organism: Influenza B virus
Molecular weightTheoretical: 6.52582 KDa
SequenceString:
UAUACCUCUG CUUCUGCUAU U

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Macromolecule #6: capped RNA

MacromoleculeName: capped RNA / type: rna / ID: 6 / Number of copies: 1
Source (natural)Organism: Influenza B virus
Molecular weightTheoretical: 6.919171 KDa
SequenceString:
(GTG)AAUGCUAUA AUAGCAGAAG

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Macromolecule #7: MAGNESIUM ION

MacromoleculeName: MAGNESIUM ION / type: ligand / ID: 7 / Number of copies: 2 / Formula: MG
Molecular weightTheoretical: 24.305 Da

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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

BufferpH: 7.4
VitrificationCryogen name: ETHANE

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Image recordingFilm or detector model: GATAN K2 QUANTUM (4k x 4k) / Average electron dose: 22.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Startup modelType of model: PDB ENTRY
Final reconstructionResolution.type: BY AUTHOR / Resolution: 3.2 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 34000
Initial angle assignmentType: MAXIMUM LIKELIHOOD
Final angle assignmentType: ANGULAR RECONSTITUTION
FSC plot (resolution estimation)

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