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- EMDB-0707: Structure of apo Machupo virus polymerase -

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Basic information

Entry
Database: EMDB / ID: EMD-0707
TitleStructure of apo Machupo virus polymerase
Map dataapo Machupo virus polymerase
Sample
  • Complex: Machupo virus polymerase
    • Protein or peptide: RNA-directed RNA polymerase L
  • Ligand: MANGANESE (II) ION
  • Ligand: ZINC ION
Function / homology
Function and homology information


negative stranded viral RNA replication / cap snatching / virion component / host cell cytoplasm / Hydrolases; Acting on ester bonds / hydrolase activity / RNA-directed RNA polymerase / RNA-dependent RNA polymerase activity / nucleotide binding / metal ion binding
Similarity search - Function
RNA polymerase, arenaviral / RNA endonuclease, cap-snatching / Arenavirus RNA polymerase / Arenavirus cap snatching domain / : / RNA-directed RNA polymerase, negative-strand RNA virus / RdRp of negative ssRNA viruses with segmented genomes catalytic domain profile.
Similarity search - Domain/homology
RNA-directed RNA polymerase L
Similarity search - Component
Biological speciesMachupo mammarenavirus / Machupo virus
Methodsingle particle reconstruction / cryo EM / Resolution: 3.58 Å
AuthorsPeng R / Xu X / Jing J / Peng Q / Gao GF / Shi Y
Funding support China, 1 items
OrganizationGrant numberCountry
National Natural Science Foundation of China (NSFC)81622031 China
CitationJournal: Nature / Year: 2020
Title: Structural insight into arenavirus replication machinery.
Authors: Ruchao Peng / Xin Xu / Jiamei Jing / Min Wang / Qi Peng / Sheng Liu / Ying Wu / Xichen Bao / Peiyi Wang / Jianxun Qi / George F Gao / Yi Shi /
Abstract: Arenaviruses can cause severe haemorrhagic fever and neurological diseases in humans and other animals, exemplified by Lassa mammarenavirus, Machupo mammarenavirus and lymphocytic choriomeningitis ...Arenaviruses can cause severe haemorrhagic fever and neurological diseases in humans and other animals, exemplified by Lassa mammarenavirus, Machupo mammarenavirus and lymphocytic choriomeningitis virus, posing great threats to public health. These viruses encode a large multi-domain RNA-dependent RNA polymerase for transcription and replication of the viral genome. Viral polymerases are one of the leading antiviral therapeutic targets. However, the structure of arenavirus polymerase is not yet known. Here we report the near-atomic resolution structures of Lassa and Machupo virus polymerases in both apo and promoter-bound forms. These structures display a similar overall architecture to influenza virus and bunyavirus polymerases but possess unique local features, including an arenavirus-specific insertion domain that regulates the polymerase activity. Notably, the ordered active site of arenavirus polymerase is inherently switched on, without the requirement for allosteric activation by 5'-viral RNA, which is a necessity for both influenza virus and bunyavirus polymerases. Moreover, dimerization could facilitate the polymerase activity. These findings advance our understanding of the mechanism of arenavirus replication and provide an important basis for developing antiviral therapeutics.
History
DepositionJul 30, 2019-
Header (metadata) releaseMar 18, 2020-
Map releaseMar 18, 2020-
UpdateDec 8, 2021-
Current statusDec 8, 2021Processing site: PDBj / Status: Released

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Structure visualization

Movie
  • Surface view with section colored by density value
  • Surface level: 0.07
  • Imaged by UCSF Chimera
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  • Surface view colored by cylindrical radius
  • Surface level: 0.07
  • Imaged by UCSF Chimera
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  • Surface view with fitted model
  • Atomic models: PDB-6kld
  • Surface level: 0.07
  • Imaged by UCSF Chimera
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Movie viewer
Structure viewerEM map:
SurfViewMolmilJmol/JSmol
Supplemental images

emd_0707.png

Downloads & links

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Map

FileDownload / File: emd_0707.map.gz / Format: CCP4 / Size: 30.5 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Annotationapo Machupo virus polymerase
Voxel sizeX=Y=Z: 1.36 Å
Density
Contour LevelBy AUTHOR: 0.06 / Movie #1: 0.07
Minimum - Maximum-0.40579376 - 0.5564657
Average (Standard dev.)0.00043287998 (±0.011163973)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions200200200
Spacing200200200
CellA=B=C: 272.0 Å
α=β=γ: 90.0 °

CCP4 map header:

modeImage stored as Reals
Å/pix. X/Y/Z1.361.361.36
M x/y/z200200200
origin x/y/z0.0000.0000.000
length x/y/z272.000272.000272.000
α/β/γ90.00090.00090.000
MAP C/R/S123
start NC/NR/NS000
NC/NR/NS200200200
D min/max/mean-0.4060.5560.000

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Supplemental data

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Sample components

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Entire : Machupo virus polymerase

EntireName: Machupo virus polymerase
Components
  • Complex: Machupo virus polymerase
    • Protein or peptide: RNA-directed RNA polymerase L
  • Ligand: MANGANESE (II) ION
  • Ligand: ZINC ION

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Supramolecule #1: Machupo virus polymerase

SupramoleculeName: Machupo virus polymerase / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1
Source (natural)Organism: Machupo mammarenavirus
Recombinant expressionOrganism: Spodoptera aff. frugiperda 1 BOLD-2017 (butterflies/moths)
Recombinant cell: HiFive
Molecular weightExperimental: 250 KDa

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Macromolecule #1: RNA-directed RNA polymerase L

MacromoleculeName: RNA-directed RNA polymerase L / type: protein_or_peptide / ID: 1 / Number of copies: 1 / Enantiomer: LEVO / EC number: RNA-directed RNA polymerase
Source (natural)Organism: Machupo virus
Molecular weightTheoretical: 250.416062 KDa
Recombinant expressionOrganism: Spodoptera aff. frugiperda 1 BOLD-2017 (butterflies/moths)
SequenceString: MDEYVQELKG LIRKHIPERC EFGHQKVTFL SQVHPSPLLT EGFKLLSSLV ELESCEAHAC QANTDQRFVD VILSDNGILC PTLPKVIPD GFKLTGKTLI LLETFVRVNP DEFEKKWKAD MSKLLNLKHD LQKSGVTLVP IVDGRSNYNN RFVADWVIER I RWLLIEIL ...String:
MDEYVQELKG LIRKHIPERC EFGHQKVTFL SQVHPSPLLT EGFKLLSSLV ELESCEAHAC QANTDQRFVD VILSDNGILC PTLPKVIPD GFKLTGKTLI LLETFVRVNP DEFEKKWKAD MSKLLNLKHD LQKSGVTLVP IVDGRSNYNN RFVADWVIER I RWLLIEIL KASKSMLEID IEDQEYQRLI HSLSNVKNQS LGLENLEHLK RNSLDYDERL NESLFIGLKG DIRESTVREE LI KLKLWFK DEVFSKGLGK FKLTDRRELL ESLSSLGAHL DSDVSSCPFC NNKLMEIVYN VTFSCVERTD GVATVDQQFS TTH SNIEKH YLSVLSLCNK IKGLKVFNTR RNTLLFLDLI MVNLMVDISD SCQDAIESLR KSGLIVGQMV MLVNDRVLDI LEAV KLIRK KIGTNPNWVK NCSKILERSH PEIWHHLSTL IKQPDFNSLI SIAQHLVSDR PIMRYSVERG SDKICRHKLF QEMSS FEQM RLFKTLSSIS LSLINSMKTS FSSRLLVNER EFSKYFGNVR LRECYAQRFY LAESLVGFLF YQKTGERSRC YSVYLS DNG VMSEQGSFYC DPKRFFLPVF SDEVLAGMCE EMTSWLDFDT GLMNDTGPIL RLLVLAILCS PSKRNQTFLQ GLRYFLM AF ANQIHHIDLT SKLVVECKSS SEVVVQRLAV GLFIRLLSGE SDASLFFSRR FKYLLNVSYL CHLITKETPD RLTDQIKC F EKFIEPKVKF GCAVVNPSLN GKLTVDQEDI MINGLKKFFS KSLRDTEDVQ TPGVCKELLN YCVSLFNRGK LKVSGELKN NPFRPNITST ALDLSSNKSV VIPKLDELGN ILSTYDKEKL VSACVSSMAE RFKTKGRYNL DPDSTDYLIL KNLTGLVSAG PKAKSTQEE LSLMYEALTE EQVESFNEIK HDVQVALAKM ADNSVNTRTK NLGRADNSVK NGNNPLDNLW SPFGVMKEIR A EVSLHEVK DFDPDVLPPE VYKELCDAVY KSSEKCNFFL EGVLDVCPLG LLLKNLTTSS YVDEEYFMCF KYLLIQGHFD QK LGSYEHK SRSRLGFTDE TLRLKDEVRL SIRESNSEAI ADKLDKSYFT NAALRNLCFY SEDSPTEFTS ISSNSGNLKF GLS YKEQVG SNRELYVGDL NTKLMTRLVE DFSEAVGNSM KYTCLNSEKE FERAICDMKM AVNNGDLSCS YDHSKWGPTM SPAL FLALL QMLELRTPVD RSKIDLDSVK SILKWHLHKV VEVPINVAEA YCIGKLKRSL GLMGCGSTSL SEEFFHQTMQ LNGQI PSHI MSVLDMGQGI LHNTSDLYGL ITEQFLCYAL DLLYDVIPVS YTSSDDQITL IKTPSLDIEG GSDAAEWLEM ICFHEF LSS KLNKFVSPKS VIGTFVAEFK SRFFVMGEET PLLTKFVAAA LHNVKCKTPT QLSETIDTIC DQCIANGVST KIVTRIS KR VNQLIRYSGY GETPFGAIED QDVKDWVDGS RGYRLQRKIE AIFHDDKETS FIRNCARKVF NDIKRGRIFE ENLINLIG R GGDEALTGFL QYAGCSEQEV NRVLNYRWVN LSSFGDLRLV LRTKLMTSRR VLEREEVPTL IKTLQSKLSR NFTKGVKKI LAESINKSAF QSSVASGFIG FCKSMGSKCV RDGKGGFLYI KEVYSGVSAC TCEICALKPK IIYCNNSLNK VSQFSKPILW DYFSLVLTN ACELGEWVFS TVKEPQKPLV LNNQNFFWAV KPKVVRQIED QLGMNHVLQS IRRNYPVLFD EHLTPFMNDL Q VSRTMDSG RLKFLDVCIA LDMMNENLGI ISHLLKTRDN SVYIVKQSDC ALAHIRQSSY TDWELGLSPQ QICTNFKTQL VL SSMVNPL VLSTSCLKSF FWFNEVLELE DDSQIELAEL TDFALMVKNQ NVSRAMFVED IAMGYVVSNF EGVRISLSNV MVD GVQLPP QEKAPDIGEL FGLKAENVIV GLVVQIDHVR MSTKFKLKRK MVYSFSLECI MDVGEIQNKE VILKVVAVDQ SVSG SGGNH MLLDGVSVVA SLPLFTGQAS FDLAAMLIES NLAGSNDNFL MRNVTLDLGG FSPELSDKYS YRLSGPENQE DPLVL KDGA FYVGGERLST YKVEFTGDLV VKALGALEDD ESVVSMLHQL WPYLKATSQV ILFQQEDFTI VHDLYKKQLT KSIESF GEW IEFTNFKVAY SKSLKELVIS DTQGSFRLKG VMCRPLASTP QVEDIE

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Macromolecule #2: MANGANESE (II) ION

MacromoleculeName: MANGANESE (II) ION / type: ligand / ID: 2 / Number of copies: 1 / Formula: MN
Molecular weightTheoretical: 54.938 Da

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Macromolecule #3: ZINC ION

MacromoleculeName: ZINC ION / type: ligand / ID: 3 / 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

Concentration1.0 mg/mL
BufferpH: 8
GridModel: Quantifoil R1.2/1.3 / Material: COPPER / Mesh: 300 / Support film - Material: CARBON / Support film - topology: HOLEY / Pretreatment - Type: GLOW DISCHARGE / Pretreatment - Atmosphere: AIR
VitrificationCryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 277 K / Instrument: FEI VITROBOT MARK IV

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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
Specialist opticsEnergy filter - Name: GIF Bioquantum / Energy filter - Slit width: 20 eV
Sample stageSpecimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER / Cooling holder cryogen: NITROGEN
Image recordingFilm or detector model: GATAN K2 SUMMIT (4k x 4k) / Detector mode: SUPER-RESOLUTION / Average electron dose: 60.0 e/Å2
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Particle selectionNumber selected: 1000000
Details: approximately 1,500,000 particles were autopicked from ~2,700 micrographs
CTF correctionSoftware - Name: Gctf (ver. 0.50)
Startup modelType of model: EMDB MAP
EMDB ID:

2930

Initial angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: RELION (ver. 2.0)
Final 3D classificationSoftware - Name: RELION (ver. 2.0)
Final angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: RELION (ver. 2.0)
Final reconstructionApplied symmetry - Point group: C1 (asymmetric) / Algorithm: FOURIER SPACE / Resolution.type: BY AUTHOR / Resolution: 3.58 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: RELION (ver. 2.0) / Number images used: 254000
FSC plot (resolution estimation)

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Atomic model buiding 1

RefinementSpace: REAL / Protocol: AB INITIO MODEL / Target criteria: Correlation coefficient
Output model

PDB-6kld:
Structure of apo Machupo virus polymerase

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