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- EMDB-31582: Cryo-EM Structure of Chikungunya Virus Nonstructural Protein 1 wi... -

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Basic information

Entry
Database: EMDB / ID: EMD-31582
TitleCryo-EM Structure of Chikungunya Virus Nonstructural Protein 1 with m7Gppp-AU
Map data
Sample
  • Complex: Nonstructural Protein 1
    • Protein or peptide: mRNA-capping enzyme nsP1
  • RNA: m7Gppp-AU
  • Ligand: ZINC ION
  • Ligand: S-ADENOSYL-L-HOMOCYSTEINE
  • Ligand: MAGNESIUM ION
Keywordsnonstructural protein / Chikungunya virus / RNA cap / replication / VIRAL PROTEIN / VIRAL PROTEIN-RNA complex
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 / synthetic construct (others)
Methodsingle particle reconstruction / cryo EM / Resolution: 2.51 Å
AuthorsZhang K / Law MCY
CitationJournal: Cell Rep / Year: 2022
Title: Molecular basis of specific viral RNA recognition and 5'-end capping by the Chikungunya virus nsP1.
Authors: Kuo Zhang / Michelle Cheok Yien Law / Trinh Mai Nguyen / Yaw Bia Tan / Melissa Wirawan / Yee-Song Law / Lak Shin Jeong / Dahai Luo /
Abstract: Many viruses encode RNA-modifying enzymes to edit the 5' end of viral RNA to mimic the cellular mRNA for effective protein translation, genome replication, and evasion of the host defense mechanisms. ...Many viruses encode RNA-modifying enzymes to edit the 5' end of viral RNA to mimic the cellular mRNA for effective protein translation, genome replication, and evasion of the host defense mechanisms. Alphavirus nsP1 synthesizes the 5' end Cap-0 structure of viral RNAs. However, the molecular basis of the capping process remains unclear. We determine high-resolution cryoelectron microscopy (cryo-EM) structures of Chikungunya virus nsP1 in complex with m7GTP/SAH, covalently attached m7GMP, and Cap-0 viral RNA. These structures reveal details of viral-RNA-capping reactions and uncover a sequence-specific virus RNA-recognition pattern that, in turn, regulates viral-RNA-capping efficiency to ensure optimal genome replication and subgenomic RNA transcription. This sequence-specific enzyme-RNA pairing is conserved across all alphaviruses.
History
DepositionJul 27, 2021-
Header (metadata) releaseJul 27, 2022-
Map releaseJul 27, 2022-
UpdateJun 5, 2024-
Current statusJun 5, 2024Processing site: PDBj / Status: Released

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Structure visualization

Supplemental images

emd_31582.png

Downloads & links

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Map

FileDownload / File: emd_31582.map.gz / Format: CCP4 / Size: 421.9 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
0.85 Å/pix.
x 480 pix.
= 408. Å		0.85 Å/pix.
x 480 pix.
= 408. Å		0.85 Å/pix.
x 480 pix.
= 408. Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 0.85 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.1
Minimum - Maximum-0.35148188 - 0.8679619
Average (Standard dev.)0.0007292143 (±0.025072983)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions480480480
Spacing480480480
CellA=B=C: 408.0 Å
α=β=γ: 90.0 °

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Supplemental data

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Sample components

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Entire : Nonstructural Protein 1

EntireName: Nonstructural Protein 1
Components
  • Complex: Nonstructural Protein 1
    • Protein or peptide: mRNA-capping enzyme nsP1
  • RNA: m7Gppp-AU
  • Ligand: ZINC ION
  • Ligand: S-ADENOSYL-L-HOMOCYSTEINE
  • Ligand: MAGNESIUM ION

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Supramolecule #1: Nonstructural Protein 1

SupramoleculeName: Nonstructural Protein 1 / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1
Source (natural)Organism: Chikungunya virus strain S27-African prototype

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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
Molecular weightTheoretical: 61.989477 KDa
Recombinant expressionOrganism: Homo sapiens (human)
SequenceString: MDPVYVDIDA DSAFLKALQR AYPMFEVEPR QVTPNDAANA RAFSHLAIKL IEQEIDPDST ILDIGSAPAR RMMSDRKYHC VCPMRSAED PERLANYARK LASAAGKVLD RNISGKIGDL QAVMAVPDTE TPTFCLHTDV SCRQRADVAI YQDVYAVHAP T SLYHQAIK ...String:
MDPVYVDIDA DSAFLKALQR AYPMFEVEPR QVTPNDAANA 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 AAGGGGSWSH PQFEKMDYKD HDGDYKDHDI DYKDDDDK

UniProtKB: Polyprotein P1234

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Macromolecule #2: m7Gppp-AU

MacromoleculeName: m7Gppp-AU / type: rna / ID: 2 / Number of copies: 12
Source (natural)Organism: synthetic construct (others)
Molecular weightTheoretical: 1.37584 KDa
SequenceString:
(GTA)UG

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Macromolecule #3: ZINC ION

MacromoleculeName: ZINC ION / type: ligand / ID: 3 / Number of copies: 12 / Formula: ZN
Molecular weightTheoretical: 65.409 Da

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Macromolecule #4: S-ADENOSYL-L-HOMOCYSTEINE

MacromoleculeName: S-ADENOSYL-L-HOMOCYSTEINE / type: ligand / ID: 4 / 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 #5: MAGNESIUM ION

MacromoleculeName: MAGNESIUM ION / type: ligand / ID: 5 / Number of copies: 12 / 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: 7.5
VitrificationCryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 277 K

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Image recordingFilm or detector model: GATAN K2 SUMMIT (4k x 4k) / Average electron dose: 70.0 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

DetailsC12
Startup modelType of model: PDB ENTRY
Final reconstructionResolution.type: BY AUTHOR / Resolution: 2.51 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 61617
Initial angle assignmentType: NOT APPLICABLE
Final angle assignmentType: NOT APPLICABLE

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