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- EMDB-15554: CryoEM structure of the Chikungunya virus nsP1 capping pores in c... -

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Basic information

Entry
Database: EMDB / ID: EMD-15554
TitleCryoEM structure of the Chikungunya virus nsP1 capping pores in complex with m7GTP and SAH ligands
Map data
Sample
  • Complex: CHIKV nsP1 capping pores in complex with m7GTP and SAH ligand with magnesium cofactor.
    • Protein or peptide: mRNA-capping enzyme nsP1
  • Ligand: ZINC ION
  • Ligand: S-ADENOSYL-L-HOMOCYSTEINE
  • Ligand: 7-METHYL-GUANOSINE-5'-TRIPHOSPHATE
  • Ligand: MAGNESIUM ION
  • Ligand: water
KeywordsAlphavirus Replication complex Capping pores Membrane pore Methyltransferase gunayltransferase VIRAL PROTEIN / VIRAL PROTEIN
Function / homology
Function and homology information


host cell filopodium / ADP-ribose 1''-phosphate phosphatase / mRNA methyltransferase activity / mRNA 5'-triphosphate monophosphatase activity / mRNA 5'-phosphatase / polynucleotide 5'-phosphatase activity / polynucleotide adenylyltransferase / poly(A) RNA polymerase activity / mRNA modification / regulation of cytoskeleton organization ...host cell filopodium / ADP-ribose 1''-phosphate phosphatase / mRNA methyltransferase activity / mRNA 5'-triphosphate monophosphatase activity / mRNA 5'-phosphatase / polynucleotide 5'-phosphatase activity / polynucleotide adenylyltransferase / poly(A) RNA polymerase activity / mRNA modification / regulation of cytoskeleton organization / symbiont-mediated suppression of host mRNA transcription via inhibition of RNA polymerase II activity / 7-methylguanosine mRNA capping / symbiont-mediated suppression of host JAK-STAT cascade via inhibition of STAT1 activity / cysteine-type peptidase activity / Transferases; Transferring one-carbon groups; Methyltransferases / host cell cytoplasmic vesicle membrane / Transferases; Transferring phosphorus-containing groups; Nucleotidyltransferases / nucleoside-triphosphate phosphatase / methylation / Hydrolases; Acting on peptide bonds (peptidases); Cysteine endopeptidases / RNA helicase activity / RNA helicase / symbiont-mediated suppression of host type I interferon-mediated signaling pathway / symbiont-mediated suppression of host innate immune response / RNA-directed RNA polymerase / viral RNA genome replication / RNA-dependent RNA polymerase activity / virus-mediated perturbation of host defense response / DNA-templated transcription / host cell nucleus / GTP binding / host cell plasma membrane / ATP hydrolysis activity / proteolysis / RNA binding / ATP binding / membrane / metal ion binding
Similarity search - Function
: / Tomato mosaic virus helicase, N-terminal domain / Alphavirus nsp2 protease (nsp2pro) domain / Alphavirus nsP2 protease domain superfamily / : / : / Peptidase family C9 / Non-structural protein 3, zinc-binding domain / Alphavirus nsp2 protease (nsp2pro) domain profile. / Viral methyltransferase ...: / Tomato mosaic virus helicase, N-terminal domain / Alphavirus nsp2 protease (nsp2pro) domain / Alphavirus nsP2 protease domain superfamily / : / : / Peptidase family C9 / Non-structural protein 3, zinc-binding domain / Alphavirus nsp2 protease (nsp2pro) domain profile. / Viral methyltransferase / Alphavirus-like methyltransferase (MT) domain / Alphavirus-like methyltransferase (MT) domain profile. / Tymovirus, RNA-dependent RNA polymerase / RNA dependent RNA polymerase / Viral (Superfamily 1) RNA helicase / (+) RNA virus helicase core domain / (+)RNA virus helicase core domain profile. / Non-structural protein 3, X-domain-like / Macro domain / Appr-1"-p processing enzyme / Macro domain / Macro domain profile. / Macro domain-like / RNA-directed RNA polymerase, catalytic domain / RdRp of positive ssRNA viruses catalytic domain profile. / S-adenosyl-L-methionine-dependent methyltransferase superfamily / DNA/RNA polymerase superfamily / P-loop containing nucleoside triphosphate hydrolase
Similarity search - Domain/homology
Biological speciesChikungunya virus strain S27-African prototype
Methodsingle particle reconstruction / cryo EM / Resolution: 2.7 Å
AuthorsJones R / Hons M / Reguera J
Funding support France, 1 items
OrganizationGrant numberCountry
ATIP-Avenir France
CitationJournal: Proc Natl Acad Sci U S A / Year: 2023
Title: Structural basis and dynamics of Chikungunya alphavirus RNA capping by nsP1 capping pores.
Authors: Rhian Jones / Michael Hons / Nadia Rabah / Noelia Zamarreño / Rocío Arranz / Juan Reguera /
Abstract: Alphaviruses are emerging positive-stranded RNA viruses which replicate and transcribe their genomes in membranous organelles formed in the cell cytoplasm. The nonstructural protein 1 (nsP1) is ...Alphaviruses are emerging positive-stranded RNA viruses which replicate and transcribe their genomes in membranous organelles formed in the cell cytoplasm. The nonstructural protein 1 (nsP1) is responsible for viral RNA capping and gates the replication organelles by assembling into monotopic membrane-associated dodecameric pores. The capping pathway is unique to Alphaviruses; beginning with the N methylation of a guanosine triphosphate (GTP) molecule, followed by the covalent linkage of an mGMP group to a conserved histidine in nsP1 and the transfer of this cap structure to a diphosphate RNA. Here, we provide structural snapshots of different stages of the reaction pathway showing how nsP1 pores recognize the substrates of the methyl-transfer reaction, GTP and S-adenosyl methionine (SAM), how the enzyme reaches a metastable postmethylation state with SAH and mGTP in the active site, and the subsequent covalent transfer of mGMP to nsP1 triggered by the presence of RNA and postdecapping reaction conformational changes inducing the opening of the pore. In addition, we biochemically characterize the capping reaction, demonstrating specificity for the RNA substrate and the reversibility of the cap transfer resulting in decapping activity and the release of reaction intermediates. Our data identify the molecular determinants allowing each pathway transition, providing an explanation for the need for the SAM methyl donor all along the pathway and clues about the conformational rearrangements associated to the enzymatic activity of nsP1. Together, our results set ground for the structural and functional understanding of alphavirus RNA-capping and the design of antivirals.
History
DepositionAug 8, 2022-
Header (metadata) releaseMar 29, 2023-
Map releaseMar 29, 2023-
UpdateJul 24, 2024-
Current statusJul 24, 2024Processing site: PDBe / Status: Released

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Structure visualization

Supplemental images

emd_15554.png

Downloads & links

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Map

FileDownload / File: emd_15554.map.gz / Format: CCP4 / Size: 178 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
0.84 Å/pix.
x 360 pix.
= 302.04 Å		0.84 Å/pix.
x 360 pix.
= 302.04 Å		0.84 Å/pix.
x 360 pix.
= 302.04 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 0.839 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.009
Minimum - Maximum-0.06362744 - 0.10138746
Average (Standard dev.)0.00017470705 (±0.0033894274)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions360360360
Spacing360360360
CellA=B=C: 302.04 Å
α=β=γ: 90.0 °

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Supplemental data

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Half map: #1

Fileemd_15554_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_15554_half_map_2.map
Projections & Slices
AxesZYX

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Histogram

Histogram (log scale)

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Sample components

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Entire : CHIKV nsP1 capping pores in complex with m7GTP and SAH ligand wit...

EntireName: CHIKV nsP1 capping pores in complex with m7GTP and SAH ligand with magnesium cofactor.
Components
  • Complex: CHIKV nsP1 capping pores in complex with m7GTP and SAH ligand with magnesium cofactor.
    • Protein or peptide: mRNA-capping enzyme nsP1
  • Ligand: ZINC ION
  • Ligand: S-ADENOSYL-L-HOMOCYSTEINE
  • Ligand: 7-METHYL-GUANOSINE-5'-TRIPHOSPHATE
  • Ligand: MAGNESIUM ION
  • Ligand: water

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Supramolecule #1: CHIKV nsP1 capping pores in complex with m7GTP and SAH ligand wit...

SupramoleculeName: CHIKV nsP1 capping pores in complex with m7GTP and SAH ligand with magnesium cofactor.
type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1
Source (natural)Organism: Chikungunya virus strain S27-African prototype
Molecular weightTheoretical: 720 KDa

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Macromolecule #1: mRNA-capping enzyme nsP1

MacromoleculeName: mRNA-capping enzyme nsP1 / type: protein_or_peptide / ID: 1 / Number of copies: 12 / Enantiomer: LEVO
EC number: Transferases; Transferring one-carbon groups; Methyltransferases
Source (natural)Organism: Chikungunya virus strain S27-African prototype / Strain: S27-African prototype
Molecular weightTheoretical: 60.946473 KDa
Recombinant expressionOrganism: Baculovirus expression vector pFastBac1-HM
SequenceString: MDPVYVDIDA DSAFLKALQR AYPMFEVEPR QVTPNDHANA RAFSHLAIKL IEQEIDPDST ILDIGSAPAR RMMSDRKYHC VCPMRSAED PERLANYARK LASAAGKVLD RNISGKIGDL QAVMAVPDTE TPTFCLHTDV SCRQRADVAI YQDVYAVHAP T SLYHQAIK ...String:
MDPVYVDIDA DSAFLKALQR AYPMFEVEPR QVTPNDHANA RAFSHLAIKL IEQEIDPDST ILDIGSAPAR RMMSDRKYHC VCPMRSAED PERLANYARK LASAAGKVLD RNISGKIGDL QAVMAVPDTE TPTFCLHTDV SCRQRADVAI YQDVYAVHAP T SLYHQAIK GVRLAYWVGF DTTPFMYNAM AGAYPSYSTN WADEQVLKAK NIGLCSTDLT EGRRGKLSIM RGKKLEPCDR VL FSVGSTL YPESRKLLKS WHLPSVFHLK GKLSFTCRCD TVVSCEGYVV KRITMSPGLY GKTTGYAVTH HADGFLMCKT TDT VDGERV SFSVCTYVPA TICDQMTGIL ATEVTPEDAQ KLLVGLNQRI VVNGRTQRNT NTMKNYMIPV VAQAFSKWAK ECRK DMEDE KLLGVRERTL TCCCLWAFKK QKTHTVYKRP DTQSIQKVQA EFDSFVVPSL WSSGLSIPLR TRIKWLLSKV PKTDL TPYS GDAQEARDAE KEAEEEREAE LTLEALPPLQ AAQEDVQVEI DVEQLEDRAG AAAHHHHHH

UniProtKB: Polyprotein P1234

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Macromolecule #2: ZINC ION

MacromoleculeName: ZINC ION / type: ligand / ID: 2 / Number of copies: 12 / Formula: ZN
Molecular weightTheoretical: 65.409 Da

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Macromolecule #3: S-ADENOSYL-L-HOMOCYSTEINE

MacromoleculeName: S-ADENOSYL-L-HOMOCYSTEINE / type: ligand / ID: 3 / Number of copies: 12 / Formula: SAH
Molecular weightTheoretical: 384.411 Da
Chemical component information

ChemComp-SAH:
S-ADENOSYL-L-HOMOCYSTEINE

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Macromolecule #4: 7-METHYL-GUANOSINE-5'-TRIPHOSPHATE

MacromoleculeName: 7-METHYL-GUANOSINE-5'-TRIPHOSPHATE / type: ligand / ID: 4 / Number of copies: 12 / Formula: MGP
Molecular weightTheoretical: 538.215 Da
Chemical component information

ChemComp-MGP:
7-METHYL-GUANOSINE-5'-TRIPHOSPHATE

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Macromolecule #5: MAGNESIUM ION

MacromoleculeName: MAGNESIUM ION / type: ligand / ID: 5 / Number of copies: 24 / Formula: MG
Molecular weightTheoretical: 24.305 Da

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Macromolecule #6: water

MacromoleculeName: water / type: ligand / ID: 6 / Number of copies: 324 / Formula: HOH
Molecular weightTheoretical: 18.015 Da
Chemical component information

ChemComp-HOH:
WATER

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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

Concentration0.2 mg/mL
BufferpH: 7.6
Component:
ConcentrationFormulaName
25.0 mMHEPES2-[4-(2-hydroxyethyl)piperazin-1-yl]ethanesulfonic acid
150.0 mMNaClSodium chloride
2.0 mMTCEPTris(2-carboxyethyl)phosphine hydrochloride
0.06 %fos-choline12Dodecylphosphocholine
2.0 mMMgCl2Magnesium chloride
GridModel: Quantifoil R2/2 / Material: GOLD / Mesh: 300 / Support film - Material: GRAPHENE OXIDE / Support film - topology: CONTINUOUS / Pretreatment - Type: GLOW DISCHARGE / Pretreatment - Time: 10 sec. / Pretreatment - Atmosphere: AIR
VitrificationCryogen name: ETHANE / Chamber humidity: 95 % / Chamber temperature: 298 K / Instrument: FEI VITROBOT MARK IV
DetailsSpecimen was incubated for 2 hours with 0.5mM SAH and m7GTP prior to plunge freezing

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Specialist opticsEnergy filter - Name: GIF Quantum LS / Energy filter - Slit width: 20 eV
Image recordingFilm or detector model: GATAN K3 (6k x 4k) / Detector mode: COUNTING / Number grids imaged: 1 / Number real images: 3077 / Average exposure time: 1.85 sec. / Average electron dose: 38.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsC2 aperture diameter: 70.0 µm / Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal defocus max: 2.2 µm / Nominal defocus min: 1.0 µm
Sample stageSpecimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Particle selectionNumber selected: 338748
Startup modelType of model: NONE
Final reconstructionNumber classes used: 1 / Applied symmetry - Point group: C12 (12 fold cyclic) / Resolution.type: BY AUTHOR / Resolution: 2.7 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: RELION / Number images used: 253384
Initial angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: RELION
Final angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: RELION
FSC plot (resolution estimation)

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Atomic model buiding 1

Initial modelPDB ID:

6z0v


Chain - Source name: PDB / Chain - Initial model type: experimental model
RefinementSpace: REAL / Protocol: FLEXIBLE FIT / Target criteria: Correlation coefficient
Output model

PDB-8aow:
CryoEM structure of the Chikungunya virus nsP1 capping pores in complex with m7GTP and SAH ligands

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