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Entry
Database: EMDB / ID: EMD-9050
TitleIn situ structure of transcriptional enzyme complex and asymmetric inner capsid protein of aquareovirus at primed state
Map dataGrass Carp reovirus TEC structure at primed state
Sampletranscriptional enzyme complex and asymmetric inner capsid protein != Grass carp reovirus

transcriptional enzyme complex and asymmetric inner capsid protein

  • Virus: Grass carp reovirus
    • Protein or peptide: VP2
    • Protein or peptide: Putative core protein NTPase/VP5
    • Protein or peptide: VP3
  • Ligand: PHOSPHATE IONPhosphate
  • Ligand: ZINC ION
Function / homology
Function and homology information


viral inner capsid / host cytoskeleton / 7-methylguanosine mRNA capping / viral genome replication / viral capsid / viral nucleocapsid / host cell cytoplasm / RNA helicase activity / RNA helicase / hydrolase activity ...viral inner capsid / host cytoskeleton / 7-methylguanosine mRNA capping / viral genome replication / viral capsid / viral nucleocapsid / host cell cytoplasm / RNA helicase activity / RNA helicase / hydrolase activity / RNA-directed RNA polymerase / RNA-dependent RNA polymerase activity / structural molecule activity / RNA binding / metal ion binding
Similarity search - Function
Reovirus minor core protein, Mu-2 / Reovirus minor core protein Mu-2 / Reovirus RNA-dependent RNA polymerase lambda 3 / Reovirus RNA-dependent RNA polymerase lambda 3 / Inner capsid protein lambda-1/ VP3 / C2H2-type zinc finger / RNA-directed RNA polymerase, reovirus / RdRp of Reoviridae dsRNA viruses catalytic domain profile. / zinc finger / Zinc finger C2H2 type domain profile. ...Reovirus minor core protein, Mu-2 / Reovirus minor core protein Mu-2 / Reovirus RNA-dependent RNA polymerase lambda 3 / Reovirus RNA-dependent RNA polymerase lambda 3 / Inner capsid protein lambda-1/ VP3 / C2H2-type zinc finger / RNA-directed RNA polymerase, reovirus / RdRp of Reoviridae dsRNA viruses catalytic domain profile. / zinc finger / Zinc finger C2H2 type domain profile. / Zinc finger C2H2 type domain signature. / Zinc finger C2H2-type / DNA/RNA polymerase superfamily
Similarity search - Domain/homology
Putative core protein NTPase/VP5 / RNA helicase / RNA-directed RNA polymerase
Similarity search - Component
Biological speciesGrass carp reovirus
Methodsingle particle reconstruction / cryo EM / Resolution: 3.4 Å
AuthorsDing K / Zhou ZH
Funding support United States, 8 items
OrganizationGrant numberCountry
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)AI094386 United States
National Institutes of Health/National Institute of Dental and Craniofacial Research (NIH/NIDCR)DE025567 United States
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)GM071940 United States
National Institutes of Health/Office of the Director1S10OD018111 United States
National Institutes of Health/National Center for Research Resources (NIH/NCRR)1S10RR23057 United States
National Science Foundation (NSF, United States)DBI-1338135 United States
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)U24GM116792 United States
National Science Foundation (NSF, United States)DMR-1548924 United States
CitationJournal: J Virol / Year: 2018
Title: Structures of the Polymerase Complex and RNA Genome Show How Aquareovirus Transcription Machineries Respond to Uncoating.
Authors: Ke Ding / Lisa Nguyen / Z Hong Zhou /
Abstract: Reoviruses carry out genomic RNA transcription within intact viruses to synthesize plus-sense RNA strands, which are capped prior to their release as mRNA. The structures of the transcriptional ...Reoviruses carry out genomic RNA transcription within intact viruses to synthesize plus-sense RNA strands, which are capped prior to their release as mRNA. The structures of the transcriptional enzyme complex (TEC) containing the RNA-dependent RNA polymerase (RdRp) and NTPase are known for the single-layered reovirus cytoplasmic polyhedrosis virus (CPV), but not for multilayered reoviruses, such as aquareoviruses (ARV), which possess a primed stage that CPV lacks. Consequently, how the RNA genome and TEC respond to priming in reoviruses is unknown. Here, we determined the near-atomic-resolution asymmetric structure of ARV in the primed state by cryo-electron microscopy (cryo-EM), revealing the structures of 11 TECs inside each capsid and their interactions with the 11 surrounding double-stranded RNA (dsRNA) genome segments and with the 120 enclosing capsid shell protein (CSP) VP3 subunits. The RdRp VP2 and the NTPase VP4 associate with each other and with capsid vertices; both bind RNA in multiple locations, including a novel C-terminal domain of VP4. Structural comparison between the primed and quiescent states showed translocation of the dsRNA end from the NTPase to the RdRp during priming. The RNA template channel was open in both states, suggesting that channel blocking is not a regulating mechanism between these states in ARV. Instead, the NTPase C-terminal domain appears to regulate RNA translocation between the quiescent and primed states. Taking the data together, dsRNA viruses appear to have adapted divergent mechanisms to regulate genome transcription while retaining similar mechanisms to coassemble their genome segments, TEC, and capsid proteins into infectious virions. Viruses in the family are characterized by the ability to endogenously synthesize nascent RNA within the virus. However, the mechanisms for assembling their RNA genomes with transcriptional enzymes into a multilayered virion and for priming such a virion for transcription are poorly understood. By cryo-EM and novel asymmetric reconstruction, we determined the atomic structure of the transcription complex inside aquareoviruses (ARV) that are primed for infection. The transcription complex is anchored by the N-terminal segments of enclosing capsid proteins and contains an NTPase and a polymerase. The NTPase has a newly discovered domain that translocates the 5' end of plus-sense RNA in segmented dsRNA genomes from the NTPase to polymerase VP2 when the virus changes from the inactive (quiescent) to the primed state. Conformation changes in capsid proteins and transcriptional complexes suggest a mechanism for relaying information from the outside to the inside of the virus during priming.
History
DepositionAug 23, 2018-
Header (metadata) releaseSep 5, 2018-
Map releaseSep 5, 2018-
UpdateNov 27, 2019-
Current statusNov 27, 2019Processing site: RCSB / Status: Released

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Structure visualization

Movie
  • Surface view with section colored by density value
  • Surface level: 0.0194
  • Imaged by UCSF Chimera
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  • Surface view colored by radius
  • Surface level: 0.0194
  • Imaged by UCSF Chimera
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  • Surface view with fitted model
  • Atomic models: PDB-6m99
  • Surface level: 0.0194
  • Imaged by UCSF Chimera
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  • Simplified surface model + fitted atomic model
  • Atomic modelsPDB-6m99
  • Imaged by Jmol
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Movie viewer
Structure viewerEM map:
SurfViewMolmilJmol/JSmol
Supplemental images

emd_9050.png

Downloads & links

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Map

FileDownload / File: emd_9050.map.gz / Format: CCP4 / Size: 103 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
AnnotationGrass Carp reovirus TEC structure at primed state
Voxel sizeX=Y=Z: 1.33 Å
Density
Contour LevelBy AUTHOR: 0.0194 / Movie #1: 0.0194
Minimum - Maximum-0.050881516 - 0.102366626
Average (Standard dev.)0.0029607322 (±0.013269705)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions300300300
Spacing300300300
CellA=B=C: 399.0 Å
α=β=γ: 90.0 °

CCP4 map header:

modeImage stored as Reals
Å/pix. X/Y/Z1.331.331.33
M x/y/z300300300
origin x/y/z0.0000.0000.000
length x/y/z399.000399.000399.000
α/β/γ90.00090.00090.000
MAP C/R/S123
start NC/NR/NS000
NC/NR/NS300300300
D min/max/mean-0.0510.1020.003

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Supplemental data

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Additional map: True asymmetric reconstruction

Fileemd_9050_additional.map
AnnotationTrue asymmetric reconstruction
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Sample components

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Entire : transcriptional enzyme complex and asymmetric inner capsid protein

EntireName: transcriptional enzyme complex and asymmetric inner capsid protein
Components
  • Virus: Grass carp reovirus
    • Protein or peptide: VP2
    • Protein or peptide: Putative core protein NTPase/VP5
    • Protein or peptide: VP3
  • Ligand: PHOSPHATE IONPhosphate
  • Ligand: ZINC ION

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Supramolecule #1: Grass carp reovirus

SupramoleculeName: Grass carp reovirus / type: virus / ID: 1 / Parent: 0 / Macromolecule list: #1-#3 / NCBI-ID: 128987 / Sci species name: Grass carp reovirus / Virus type: VIRION / Virus isolate: STRAIN / Virus enveloped: No / Virus empty: No
Host (natural)Organism: Ctenopharyngodon idella (grass carp)

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Macromolecule #1: VP2

MacromoleculeName: VP2 / type: protein_or_peptide / ID: 1 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Grass carp reovirus
Molecular weightTheoretical: 141.685438 KDa
SequenceString: MEELFNALPQ PLQQLSLALA GEIPLTDHIF EQAASTWHVQ PRSLTYKLLD HIPFATPVVV PPSIYHSLDW SKCFAVNQDR VERIPTIDN PDDVYVPNSD IGPLLTSLHT IPDYGFLHPT IENDATTLRA ERARCASTFY KIASSQARQV KLDPIRMLGF L LLVQARPR ...String:
MEELFNALPQ PLQQLSLALA GEIPLTDHIF EQAASTWHVQ PRSLTYKLLD HIPFATPVVV PPSIYHSLDW SKCFAVNQDR VERIPTIDN PDDVYVPNSD IGPLLTSLHT IPDYGFLHPT IENDATTLRA ERARCASTFY KIASSQARQV KLDPIRMLGF L LLVQARPR VPSGLVTDQP TRRDPTLSPA LHAIWQVMQY YKVAGVYYAP ALVVPSGAIW WIPPPGKRNV VSVQYLLTDL IS LAILAHM TDMSPTLELT GVLMYLRAAS SHSYAYTLLQ MKSVFPALSL RSMYRNKGFG GKAPAIEWTE PRSKYKFRWT GVT QLHDGL RPRSPSMDVP TLETLAKYEL VDIGHTIIRE RNAHPQHNHD SVRFVRDVMA LTSGMYLVRQ PTMSVLREYS QVPD IKDPI PPSAWTGPIG NVRYLLPSVQ GPARHLYDTW RAAARQIAQD PQWHDPLNQA IMRAQYVTAR GGSSASLKFA LKVTG IVLP EYDDSKVKKS SKIYQAAQIA RIAFMLLIAA IHAEVTMGIR NQVQRRARSI MPLNVIQQAI SAPHTLVANY INKHMN LST TSGSVVTDKV IPLILYASTP PNTVVNVDIK ACDASITYNY FLSVICGAMH EGFEVGNADA AFMGVPSTIV SDRRSPV AP YSRPISGLQT MVQHLADLYA AGFRYSVSDA FSSGNKFSFP TSTFPSGSTA TSTEHTANNS TMMEYFLNVH APSHVKSA S LKRILTDMTI QRNYVCQGDD GILLLPHEAA SKISADDMNE LLTCLRDYGQ LFGWNYDIDW SDTAEYLKLY ALMGCRIPN TSRHPPVGKE YAAPQTDEIW PSLIDIVIGH HLNGVTDVLN WREWLRFSWA FACYSSRGGY TNPRGQSFSA QYPWWTFVYL GIPPILLPG QTPFIHSCYM PPGDQGMFSI LNGWRDWLIS HASTTLPPLR HNHPVWGLSD VPSLLSQFGV YAGYHAAQHY R RPKPAPET ASSDSINQIT SDLTEYLFYD SALKARVMKG RYNWERLSSS LSLNVGSRVP SLFDVPGKWV AAGRDAEKPP PS SVEDMFT SLNRCIRRPT HSFSRLLELY LRVHVALGES IPLAIDPDVP QVAGADPAND DHWFKYTCLG DIPSATRNYF GES LFVGRV VSGLDVEAVD ATLLRLKILG APPEAFIAVL NGIGMSDSEA HQIAGRISLA NAQLVQIARV VHLSIPSSWM TLNT GPYIH HHAYDFKPGI TQPSAKSRDK SIWMSPILKL LCTSYAMTVA GPVRTSIVTE IDGSAAALSG NLRVWMRDV

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Macromolecule #2: Putative core protein NTPase/VP5

MacromoleculeName: Putative core protein NTPase/VP5 / type: protein_or_peptide / ID: 2 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Grass carp reovirus
Molecular weightTheoretical: 80.381516 KDa
SequenceString: MITIVVIPTA HFSWTDTNFL NSVDYRLTSQ PKIRDRFAVY APGWLRRQLD EFSASLTASE LLQALQTIPI PVKARCLLLP KPKRFAQWL LDVPSANIWH IPVTTLRATV ASKHPSSDVY NYIPDHVPPN AEFDTVTRRV AAGRDIYVRS TKVIGAPLCL A APAKYYAG ...String:
MITIVVIPTA HFSWTDTNFL NSVDYRLTSQ PKIRDRFAVY APGWLRRQLD EFSASLTASE LLQALQTIPI PVKARCLLLP KPKRFAQWL LDVPSANIWH IPVTTLRATV ASKHPSSDVY NYIPDHVPPN AEFDTVTRRV AAGRDIYVRS TKVIGAPLCL A APAKYYAG YLSTHQLDGI YPENWAPDNF HKREFCLTIL PSLLGPRTFL LDVDADRDAS YPLSVLWPQL RALALKSRLL LP PVALLRR VVDPGLKPTW SADSDAAFRA LRLSRPSSAS KPVGFDFSAL PVVDIICLLE SEPDDHGRIA PGTRLTIHSV PTD LLTSLS IQEGVRYPLR QESGMFVHWV LLALLMSDDV TISGTRRSVK LETAHASARP FVHITVERCA SARIIDVRGS PAMY ANAVC LTLPKGSYKS TIIDTLPAMF SDLPILEQAA VIDSDALGDS LRPSFETQFL ERLENLDPNL LDRAVASILS PTSDT SDDA VTTVLDAFNA LYREIMTPAQ RARLPLLTQQ GRVLAFAHSD YELLSANIPI QVVRGSIPID HVVNLLARRN RVGGTA LQV LLDYCYRTQA SPLAPTPAGR LYKQLFGPWL MVPRLSEPLI KLRLVASAPA KVLRAAGWTI DGDPPLEVSC LCAYVTD RA AATALIERRL DSRALVTVGG DQLMFVEYAP PLPLVSIPRT FLLPVTYVVH WVPPQRVLLN GGNVSFTSGL EWTFDDDP Q VVTSTGV

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Macromolecule #3: VP3

MacromoleculeName: VP3 / type: protein_or_peptide / ID: 3 / Number of copies: 10 / Enantiomer: LEVO
Source (natural)Organism: Grass carp reovirus
Molecular weightTheoretical: 132.203312 KDa
SequenceString: MPRRSARKAQ SAIASPADTN VVPAKDAPTT NSPPSTTSPN QAAADANQQQ AGIVSSQSGP NAVGDSAPSS SVNNDGDIIT RPTSDSIAA VANATKPAAV VSDPQSMKVT PIVNPSSYVC NVCNARFSTM SALSEHLRSD HRDDASTLLA TPMINNAIRS F LTAWDDIR ...String:
MPRRSARKAQ SAIASPADTN VVPAKDAPTT NSPPSTTSPN QAAADANQQQ AGIVSSQSGP NAVGDSAPSS SVNNDGDIIT RPTSDSIAA VANATKPAAV VSDPQSMKVT PIVNPSSYVC NVCNARFSTM SALSEHLRSD HRDDASTLLA TPMINNAIRS F LTAWDDIR ILSPDVSSKS LSAYLDSAVA NGPELIIEDT GLCTSFMLLD NIPSAHLTKE LIGFTWFMQM YQMTPPLPEG AV NRIVCMT NWASLGDEGR GLEVRLPPPT DSSVHAYKTV LSRGYIDNAQ FNPLALRSNV LLMLLQFTLS NLKINKSSTF TSD VTTITS GRMIRAFEGR PELLALAYPG RAVLPTQTKN AQFLSTAIAD RIGRLDRANL IGGEVSAMVE CMELCDALTL HIRE TYIML LRSMHQDPTQ IVQIVNECAN NLLNSTIPIS LRPTILCPWF ASSEDLRLQQ VMHLVNISSN TAAALPLVEA LSTLL RSVT PLVLDPTVLT NAITTISEST TQTISPISEI LRLLQPMGND YAAFWKCIAS WAYNGLVTTV LSEDAFPDSS QSITHL PSM WKCLFLTLAG PMTSDPHSPV KVFMALANLL AQPEPIAIGV PGMHQTTPAS QFSHPGVWPP GFLNPQLINP QQAPLLR AF AEHIRANWPQ PSEFGYGSTL QGSANLFIPS NRMVYPWPNQ PLPRLTVAPT YDSAMSNWIS TTIAFFIRVV NSVNMTAT V NDLTRRTMTG VMTAMRQVKT MTPFYIQHMC PTELSVLASV TVTPPFQVPF TRLVQNDVIT NVLVARVDPA QRGDAAVDI RATHATFAAA LPVDPAAIVV AMLCGQTETN LIPSHHYGKA FAPLFASNAM FTRNQRAVIT REAFVCARSA VAQCQDAGFL VPRPLDALR QFDVTSAAAA EIMHAVNDAF KTAFDLDGAL LDGLALYGDP RIADLSAAYL QYGGNVVREH VPPGPSHIHR A LQQVESTF MAEMNLFNVA RGNLYLVQTA TNGNWSPMAP VAAPPFVRGG PNVRVVGRFG TIVPRPNGLE PQLIDDGNVP RD IAGDWVY PSDVLQVSVA VFRDYVWPMV KAGRTRVLVE LGHYVYTLHY YDPQISLDEA PILEEWLSKI NPAGIPPVPF CIP IPQVYP CITARRVHYA FTSENNNDSL FSTNAASIDT AFGENAAVSP LRWPGLVDPN YRVGTNDLPN RITLYNSLYR YNFT YPTLD GIMYVRSAT

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Macromolecule #4: PHOSPHATE ION

MacromoleculeName: PHOSPHATE ION / type: ligand / ID: 4 / Number of copies: 1 / Formula: PO4
Molecular weightTheoretical: 94.971 Da
Chemical component information

ChemComp-PO4:
PHOSPHATE ION / Phosphate

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Macromolecule #5: ZINC ION

MacromoleculeName: ZINC ION / type: ligand / ID: 5 / Number of copies: 1 / Formula: ZN
Molecular weightTheoretical: 65.409 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: 7.5
GridModel: Quantifoil R1.2/1.3 / Material: COPPER / Mesh: 400
VitrificationCryogen name: ETHANE

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELDBright-field microscopy
Image recordingFilm or detector model: GATAN K2 SUMMIT (4k x 4k) / Average electron dose: 25.0 e/Å2
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Initial angle assignmentType: PROJECTION MATCHING
Final angle assignmentType: PROJECTION MATCHING
Final reconstructionAlgorithm: FOURIER SPACE / Resolution.type: BY AUTHOR / Resolution: 3.4 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 73472

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