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- PDB-7fgh: Cryo-EM Structure of Chikungunya Virus Nonstructural Protein 1 wi... -

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Basic information

Entry
Database: PDB / ID: 7fgh
TitleCryo-EM Structure of Chikungunya Virus Nonstructural Protein 1 with m7GMP
ComponentsmRNA-capping enzyme nsP1
KeywordsVIRAL PROTEIN / nonstructural protein / Chikungunya virus / RNA cap / replication
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 / cysteine-type peptidase activity / symbiont-mediated suppression of host JAK-STAT cascade via inhibition of STAT1 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 / RNA-directed RNA polymerase / viral RNA genome replication / RNA-dependent RNA polymerase activity / : / 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
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 / 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
N7-METHYL-GUANOSINE-5'-MONOPHOSPHATE / S-ADENOSYL-L-HOMOCYSTEINE / Polyprotein P1234
Similarity search - Component
Biological speciesChikungunya virus strain S27-African prototype
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.18 Å
AuthorsZhang, K. / Law, M.C.Y. / Nguyen, T.M. / Tan, Y.B. / Wirawan, M. / Law, Y.S. / Luo, D.H.
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, 2021Deposition site: PDBJ / Processing site: PDBJ
Revision 1.0Jul 27, 2022Provider: repository / Type: Initial release
Revision 1.1Aug 10, 2022Group: Database references / Category: citation / citation_author
Item: _citation.country / _citation.journal_abbrev ..._citation.country / _citation.journal_abbrev / _citation.journal_id_CSD / _citation.journal_id_ISSN / _citation.journal_volume / _citation.page_first / _citation.page_last / _citation.pdbx_database_id_DOI / _citation.pdbx_database_id_PubMed / _citation.title / _citation.year

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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)754,61548
Polymers744,67812
Non-polymers9,93736
Water25,5091416
1


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

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Components

#1: Protein
mRNA-capping enzyme nsP1 / Nonstructural Protein 1


Mass: 62056.539 Da / Num. of mol.: 12
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
#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


Type: L-peptide linking / Mass: 384.411 Da / Num. of mol.: 12 / Source method: obtained synthetically / Formula: C14H20N6O5S
#4: Chemical
ChemComp-G7M / N7-METHYL-GUANOSINE-5'-MONOPHOSPHATE


Type: RNA linking / Mass: 378.255 Da / Num. of mol.: 12 / Source method: obtained synthetically / Formula: C11H17N5O8P
#5: Water ChemComp-HOH / water


Mass: 18.015 Da / Num. of mol.: 1416 / Source method: isolated from a natural source / Formula: H2O
Has ligand of interestN

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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
Image recordingElectron dose: 70 e/Å2 / Film or detector model: GATAN K2 SUMMIT (4k x 4k)

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Processing

SoftwareName: PHENIX / Version: 1.18.2_3874: / Classification: refinement
CTF correctionType: NONE
3D reconstructionResolution: 2.18 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 225575 / Symmetry type: POINT
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.00644064
ELECTRON MICROSCOPYf_angle_d0.82359772
ELECTRON MICROSCOPYf_dihedral_angle_d24.4486120
ELECTRON MICROSCOPYf_chiral_restr0.0546744
ELECTRON MICROSCOPYf_plane_restr0.0067512

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