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- PDB-8jce: Cryo-EM Structure of Chikungunya Virus Nonstructural Protein 1 wi... -

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Basic information

Entry
Database: PDB / ID: 8jce
TitleCryo-EM Structure of Chikungunya Virus Nonstructural Protein 1 with m7GpppAmU
ComponentsmRNA-capping enzyme nsP1
KeywordsVIRAL PROTEIN / nonstructural protein / Chikungunya virus / RNA cap / replication
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 5'-phosphatase activity / polynucleotide adenylyltransferase / 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 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 innate immune response / 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 / (+) 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
S-ADENOSYL-L-HOMOCYSTEINE / Chem-YG4 / Polyprotein P1234
Similarity search - Component
Biological speciesChikungunya virus strain S27-African prototype
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.41 Å
AuthorsZhang, K. / Law, M.C.Y. / Nguyen, T.M. / Tan, Y.B. / Wirawan, M. / Law, Y.S. / Luo, D.H.
Funding support1items
OrganizationGrant numberCountry
Not funded
CitationJournal: J Biol Chem / Year: 2023
Title: Chikungunya virus nonstructural protein 1 is a versatile RNA capping and decapping enzyme.
Authors: Michelle Cheok Yien Law / Kuo Zhang / Yaw Bia Tan / Trinh Mai Nguyen / Dahai Luo /
Abstract: Chikungunya virus (CHIKV) nonstructural protein 1 (nsP1) contains both the N7-guanine methyltransferase and guanylyltransferase activities and catalyzes the 5' end cap formation of viral RNAs. To ...Chikungunya virus (CHIKV) nonstructural protein 1 (nsP1) contains both the N7-guanine methyltransferase and guanylyltransferase activities and catalyzes the 5' end cap formation of viral RNAs. To further understand its catalytic activity and role in virus-host interaction, we demonstrate that purified recombinant CHIKV nsP1 can reverse the guanylyl transfer reaction and remove the mGMP from a variety of capped RNA substrates including host mRNAs. We then provide the structural basis of this function with a high-resolution cryo-EM structure of nsP1 in complex with the unconventional cap-1 substrate RNA mGpppAU. We show that the 5'ppRNA species generated by decapping can trigger retinoic acid-inducible gene I-mediated interferon response. We further demonstrate that the decapping activity is conserved among the alphaviral nsP1s. To our knowledge, this is a new mechanism through which alphaviruses activate the antiviral immune response. This decapping activity could promote cellular mRNA degradation and facilitate viral gene expression, which is functionally analogous to the cap-snatching mechanism by influenza virus.
History
DepositionMay 11, 2023Deposition site: PDBJ / Processing site: PDBJ
Revision 1.0Nov 15, 2023Provider: repository / Type: Initial release
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Revision 1.1Dec 6, 2023Group: Database references / Category: citation / Item: _citation.journal_volume / _citation.title
Revision 1.2Jun 18, 2025Group: Data collection / Structure summary
Category: chem_comp / em_admin ...chem_comp / em_admin / em_software / pdbx_entry_details
Item: _chem_comp.mon_nstd_flag / _chem_comp.type ..._chem_comp.mon_nstd_flag / _chem_comp.type / _em_admin.last_update / _em_software.name / _pdbx_entry_details.has_protein_modification
Revision 1.1Jun 18, 2025Data content type: EM metadata / Data content type: EM metadata / EM metadata / Group: Data processing / Experimental summary / Data content type: EM metadata / EM metadata / Category: em_admin / em_software / Data content type: EM metadata / EM metadata / Item: _em_admin.last_update / _em_software.name

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: mRNA-capping enzyme nsP1
B: mRNA-capping enzyme nsP1
C: mRNA-capping enzyme nsP1
D: mRNA-capping enzyme nsP1
E: mRNA-capping enzyme nsP1
F: mRNA-capping enzyme nsP1
G: mRNA-capping enzyme nsP1
H: mRNA-capping enzyme nsP1
I: mRNA-capping enzyme nsP1
J: mRNA-capping enzyme nsP1
K: mRNA-capping enzyme nsP1
L: mRNA-capping enzyme nsP1
hetero molecules


Theoretical massNumber of molelcules
Total (without water)762,89160
Polymers743,87412
Non-polymers19,01748
Water10,593588
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: electron microscopy
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

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Protein , 1 types, 12 molecules ABCDEFGHIJKL

#1: Protein
mRNA-capping enzyme nsP1 / Non-structural protein 1


Mass: 61989.477 Da / Num. of mol.: 12 / Mutation: H37A
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Chikungunya virus strain S27-African prototype
Production host: Homo sapiens (human)
References: UniProt: Q8JUX6, Transferases; Transferring one-carbon groups; Methyltransferases, Transferases; Transferring phosphorus-containing groups; Nucleotidyltransferases

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Non-polymers , 5 types, 636 molecules

#2: Chemical
ChemComp-ZN / ZINC ION


Mass: 65.409 Da / Num. of mol.: 12 / Source method: obtained synthetically / Formula: Zn
#3: Chemical
ChemComp-SAH / S-ADENOSYL-L-HOMOCYSTEINE


Mass: 384.411 Da / Num. of mol.: 12 / Source method: obtained synthetically / Formula: C14H20N6O5S
#4: Chemical
ChemComp-YG4 / [(2~{R},3~{R},4~{R},5~{R})-5-(6-azanyl-7,8-dihydropurin-9-yl)-2-[[[[[(2~{R},3~{S},4~{R},5~{R})-5-(2-azanyl-7-methyl-6-oxidanylidene-1,8-dihydropurin-9-yl)-3,4-bis(oxidanyl)oxolan-2-yl]methoxy-oxidanyl-phosphoryl]oxy-oxidanyl-phosphoryl]oxy-oxidanyl-phosphoryl]oxymethyl]-4-methoxy-oxolan-3-yl] [(2~{R},3~{S},4~{R},5~{S})-5-[2,4-bis(oxidanylidene)pyrimidin-1-yl]-3,4-bis(oxidanyl)oxolan-2-yl]methyl hydrogen phosphate


Mass: 1110.657 Da / Num. of mol.: 12 / Source method: obtained synthetically / Formula: C31H46N12O25P4 / Feature type: SUBJECT OF INVESTIGATION
#5: Chemical
ChemComp-MG / MAGNESIUM ION


Mass: 24.305 Da / Num. of mol.: 12 / Source method: obtained synthetically / Formula: Mg
#6: Water ChemComp-HOH / water


Mass: 18.015 Da / Num. of mol.: 588 / Source method: isolated from a natural source / Formula: H2O

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Details

Has ligand of interestY
Has protein modificationN

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Experimental details

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Experiment

ExperimentMethod: ELECTRON MICROSCOPY
EM experimentAggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction

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Sample preparation

ComponentName: Nonstructural Protein 1 / Type: COMPLEX / Entity ID: #1 / Source: RECOMBINANT
Source (natural)Organism: Chikungunya virus strain S27-African prototype
Source (recombinant)Organism: Homo sapiens (human)
Buffer solutionpH: 7.5
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationCryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 277 K

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: FEI TITAN KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Nominal defocus max: 3500 nm / Nominal defocus min: 600 nm
Image recordingElectron dose: 70 e/Å2 / Film or detector model: GATAN K2 SUMMIT (4k x 4k)

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Processing

EM softwareName: PHENIX / Category: model refinement
CTF correctionType: NONE
3D reconstructionResolution: 2.41 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 70128 / Symmetry type: POINT
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.00344712
ELECTRON MICROSCOPYf_angle_d0.51760816
ELECTRON MICROSCOPYf_dihedral_angle_d5.2616828
ELECTRON MICROSCOPYf_chiral_restr0.0426852
ELECTRON MICROSCOPYf_plane_restr0.0047716

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