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- PDB-8uux: Murine norovirus capsid protein in the presence of 1mM calcium -

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Basic information

Entry
Database: PDB / ID: 8uux
TitleMurine norovirus capsid protein in the presence of 1mM calcium
ComponentsCapsid proteinCapsid
KeywordsVIRAL PROTEIN / murine / norovirus / metals / activation
Function / homologyCalicivirus coat protein C-terminal / Calicivirus coat protein C-terminal / Calicivirus coat protein / Calicivirus coat protein / Picornavirus/Calicivirus coat protein / Viral coat protein subunit / virus-mediated perturbation of host defense response / Capsid protein
Function and homology information
Biological speciesMurine norovirus 1
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.74 Å
AuthorsSmith, T.J.
Funding support United States, 1items
OrganizationGrant numberCountry
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)AI141465 United States
CitationJournal: J Virol / Year: 2024
Title: The reversible activation of norovirus by metal ions.
Authors: Michael Sherman / Faith Cox / Hong Smith / Mohamed H Habib / Stephanie Karst / Christiane E Wobus / Thomas J Smith /
Abstract: Murine norovirus (MNV) undergoes extremely large conformational changes in response to the environment. The = 3 icosahedral capsid is composed of 180 copies of ~58-kDa VP1 comprised of N-terminus (N) ...Murine norovirus (MNV) undergoes extremely large conformational changes in response to the environment. The = 3 icosahedral capsid is composed of 180 copies of ~58-kDa VP1 comprised of N-terminus (N), shell (S), and C-terminal protruding (P) domains. At neutral pH, the P domains are loosely tethered to the shell and float ~15 Å above the surface. At low pH or in the presence of bile salts, the P domain drops onto the shell and this movement is accompanied by conformational changes within the P domain that enhance receptor interactions while blocking antibody binding. While previous crystallographic studies identified metal binding sites in the isolated P domain, the ~2.7-Å cryo-electron microscopy structures of MNV in the presence of Mg or Ca presented here show that metal ions can recapitulate the contraction observed at low pH or in the presence of bile. Further, we show that these conformational changes are reversed by dialysis against EDTA. As observed in the P domain crystal structures, metal ions bind to and contract the G'H' loop. This movement is correlated with the lifting of the C'D' loop and rotation of the P domain dimers about each other, exposing the bile salt binding pocket. Isothermal titration calorimetry experiments presented here demonstrate that the activation signals (bile salts, low pH, and metal ions) act in a synergistic manner that, individually, all result in the same activated structure. We present a model whereby these reversible conformational changes represent a uniquely dynamic and tissue-specific structural adaptation to the environment.IMPORTANCEThe highly mobile protruding domains on the calicivirus capsids are recognized by cell receptor(s) and antibodies. At neutral pH, they float ~15 Å above the shell but at low pH or in the presence of bile salts, they contract onto the surface. Concomitantly, changes within the P domain block antibody binding while enhancing receptor binding. While we previously demonstrated that metals also block antibody binding, it was unknown whether they might also cause similar conformational changes in the virion. Here, we present the near atomic cryo-electron microscopy structures of infectious murine norovirus (MNV) in the presence of calcium or magnesium ions. The metal ions reversibly induce the same P domain contraction as low pH and bile salts and act in a synergistic manner with the other stimuli. We propose that, unlike most other viruses, MNV facilely changes conformations as a unique means to escape immune surveillance as it moves through various tissues.
History
DepositionNov 2, 2023Deposition site: RCSB / Processing site: RCSB
Revision 1.0Jan 17, 2024Provider: repository / Type: Initial release
Revision 1.1Jan 31, 2024Group: Database references / Category: citation / citation_author
Item: _citation.page_first / _citation.page_last ..._citation.page_first / _citation.page_last / _citation.pdbx_database_id_DOI / _citation.pdbx_database_id_PubMed
Revision 1.2Feb 28, 2024Group: Database references / Category: citation / Item: _citation.journal_volume

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

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Assembly

Deposited unit
A: Capsid protein
B: Capsid protein
C: Capsid protein
hetero molecules


Theoretical massNumber of molelcules
Total (without water)168,5306
Polymers168,4103
Non-polymers1203
Water5,585310
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: electron microscopy, not applicable
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

#1: Protein Capsid protein / Capsid


Mass: 56136.617 Da / Num. of mol.: 3 / Source method: isolated from a natural source / Source: (natural) Murine norovirus 1 / References: UniProt: Q2V8W4
#2: Chemical ChemComp-CA / CALCIUM ION


Mass: 40.078 Da / Num. of mol.: 3 / Source method: obtained synthetically / Formula: Ca / Feature type: SUBJECT OF INVESTIGATION
#3: Water ChemComp-HOH / water / Water


Mass: 18.015 Da / Num. of mol.: 310 / Source method: isolated from a natural source / Formula: H2O
Has ligand of interestY

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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: Murine norovirus 1 / Type: VIRUS / Entity ID: #1 / Source: NATURAL
Source (natural)Organism: Murine norovirus 1
Details of virusEmpty: NO / Enveloped: NO / Isolate: STRAIN / Type: VIRION
Buffer solutionpH: 7.4
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationCryogen name: ETHANE-PROPANE

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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: SPOT SCAN
Electron lensMode: BRIGHT FIELDBright-field microscopy / Nominal defocus max: 2500 nm / Nominal defocus min: 1500 nm
Image recordingElectron dose: 48 e/Å2 / Film or detector model: GATAN K3 (6k x 4k)

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Processing

CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 2.74 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 77727 / Symmetry type: POINT
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.00212097
ELECTRON MICROSCOPYf_angle_d0.59116588
ELECTRON MICROSCOPYf_dihedral_angle_d5.4211655
ELECTRON MICROSCOPYf_chiral_restr0.0451888
ELECTRON MICROSCOPYf_plane_restr0.0062172

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