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- EMDB-30796: Structural insights into viral RNA capping and plasma membrane ta... -

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Basic information

Entry
Database: EMDB / ID: EMD-30796
TitleStructural insights into viral RNA capping and plasma membrane targeting by Chikungunya virus nonstructural protein 1
Map data
Sample
  • Complex: Nonstructural Protein 1
    • Protein or peptide: Nonstructural Protein 1
  • Ligand: ZINC ION
Keywordsnonstructural protein / Chikungunya virus / RNA cap / replication / membrane associations / VIRAL PROTEIN
Function / homology
Function and homology information


ADP-ribose 1''-phosphate phosphatase / host cell filopodium / mRNA methyltransferase activity / mRNA 5'-triphosphate monophosphatase activity / mRNA 5'-phosphatase / polynucleotide adenylyltransferase / polynucleotide 5'-phosphatase activity / poly(A) RNA polymerase activity / mRNA modification / regulation of cytoskeleton organization ...ADP-ribose 1''-phosphate phosphatase / host cell filopodium / mRNA methyltransferase activity / mRNA 5'-triphosphate monophosphatase activity / mRNA 5'-phosphatase / polynucleotide adenylyltransferase / polynucleotide 5'-phosphatase activity / 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 / symbiont-mediated suppression of host innate immune response / RNA helicase / symbiont-mediated suppression of host type I interferon-mediated signaling pathway / symbiont-mediated suppression of host gene expression / RNA-directed RNA polymerase / viral RNA genome replication / RNA-directed RNA polymerase activity / DNA-templated transcription / GTP binding / host cell nucleus / host cell plasma membrane / ATP hydrolysis activity / proteolysis / RNA binding / ATP binding / metal ion binding / membrane
Similarity search - Function
: / Alphavirus nsp2 protease (nsp2pro) domain / Alphavirus nsP2 protease domain superfamily / : / Peptidase family C9 / Tomato mosaic virus helicase, N-terminal domain / Alphavirus nsp2 protease (nsp2pro) domain profile. / : / Non-structural protein 3, zinc-binding domain / Viral methyltransferase ...: / Alphavirus nsp2 protease (nsp2pro) domain / Alphavirus nsP2 protease domain superfamily / : / Peptidase family C9 / Tomato mosaic virus helicase, N-terminal domain / Alphavirus nsp2 protease (nsp2pro) domain profile. / : / Non-structural protein 3, zinc-binding domain / 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 core domain / (+) RNA virus helicase core domain / (+)RNA virus helicase core domain profile. / Non-structural protein 3, X-domain-like / Appr-1"-p processing enzyme / Macro domain / Macro domain profile. / Macro domain / 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: 2.38 Å
AuthorsZhang K / Law YS
CitationJournal: Cell Host Microbe / Year: 2021
Title: Structural insights into viral RNA capping and plasma membrane targeting by Chikungunya virus nonstructural protein 1.
Authors: Kuo Zhang / Yee-Song Law / Michelle Cheok Yien Law / Yaw Bia Tan / Melissa Wirawan / Dahai Luo /
Abstract: Chikungunya virus (CHIKV) causes a debilitating arthralgic inflammatory disease in humans. The multifunctional CHIKV protein, nsP1, facilitates virus RNA replication and transcription by anchoring ...Chikungunya virus (CHIKV) causes a debilitating arthralgic inflammatory disease in humans. The multifunctional CHIKV protein, nsP1, facilitates virus RNA replication and transcription by anchoring the viral replication complex (RC) to plasma membrane vesicles and synthesizing the viral RNA 5' cap-0. Here, we report a cryo-EM structure of CHIKV nsP1 at 2.38 Å resolution. Twelve copies of nsP1 form a crown-shaped ring structure with a 7.5-nm-wide channel for mediating communication and exchange between the viral RC and the host cell. The catalytic site for viral RNA capping is located in a tunnel that is shaped by neighboring nsP1 molecules. Two membrane-association loops target nsP1 to the inner leaflet of the plasma membrane via palmitoylation and hydrophobic and electrostatic interactions. Our study provides the structural basis of viral RNA capping and RC assembly mediated by nsP1 and guides the development of antivirals targeting these essential steps of virus infection.
History
DepositionDec 15, 2020-
Header (metadata) releaseMar 24, 2021-
Map releaseMar 24, 2021-
UpdateJun 25, 2025-
Current statusJun 25, 2025Processing site: PDBj / Status: Released

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Structure visualization

Movie
  • Surface view with section colored by density value
  • Surface level: 0.3
  • Imaged by UCSF Chimera
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  • Surface view colored by cylindrical radius
  • Surface level: 0.3
  • Imaged by UCSF Chimera
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  • Surface view with fitted model
  • Atomic models: PDB-7dop
  • Surface level: 0.3
  • Imaged by UCSF Chimera
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  • Simplified surface model + fitted atomic model
  • Atomic modelsPDB-7dop
  • Imaged by Jmol
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Movie viewer
Structure viewerEM map:
SurfViewMolmilJmol/JSmol
Supplemental images

emd_30796.png

Downloads & links

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Map

FileDownload / File: emd_30796.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.)
0.86 Å/pix.
x 480 pix.
= 411.84 Å		0.86 Å/pix.
x 480 pix.
= 411.84 Å		0.86 Å/pix.
x 480 pix.
= 411.84 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 0.858 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.3 / Movie #1: 0.3
Minimum - Maximum-1.8739877 - 3.1486678
Average (Standard dev.)0.0010452383 (±0.0688101)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions480480480
Spacing480480480
CellA=B=C: 411.84 Å
α=β=γ: 90.0 °

CCP4 map header:

modeImage stored as Reals
Å/pix. X/Y/Z0.8580.8580.858
M x/y/z480480480
origin x/y/z0.0000.0000.000
length x/y/z411.840411.840411.840
α/β/γ90.00090.00090.000
start NX/NY/NZ1219875
NX/NY/NZ141223232
MAP C/R/S123
start NC/NR/NS000
NC/NR/NS480480480
D min/max/mean-1.8743.1490.001

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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: Nonstructural Protein 1
  • Ligand: ZINC 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: Nonstructural Protein 1

MacromoleculeName: Nonstructural Protein 1 / type: protein_or_peptide / ID: 1 / Number of copies: 12 / Enantiomer: LEVO
Source (natural)Organism: Chikungunya virus strain S27-African prototype / Strain: S27-African prototype
Molecular weightTheoretical: 62.056539 KDa
Recombinant expressionOrganism: Homo sapiens (human)
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 AAGGGGSWSH PQFEKMDYKD HDGDYKDHDI DYKDDDDK

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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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: 7.8
GridModel: Quantifoil R1.2/1.3 / Support film - Material: GRAPHENE / Support film - topology: CONTINUOUS / Support film - Film thickness: 0.345 / Pretreatment - Type: GLOW DISCHARGE / Pretreatment - Time: 10 sec.
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 K3 (6k x 4k) / Average electron dose: 53.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Cs: 2.7 mm
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

CTF correctionType: NONE
Startup modelType of model: PDB ENTRY
Final reconstructionResolution.type: BY AUTHOR / Resolution: 2.38 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 269498
Initial angle assignmentType: NOT APPLICABLE
Final angle assignmentType: NOT APPLICABLE

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