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- PDB-9oh5: Cryo-EM structure of the assembled MS2 CPM58 VLP -

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Basic information

Entry
Database: PDB / ID: 9oh5
TitleCryo-EM structure of the assembled MS2 CPM58 VLP
ComponentsMS2 CPM58
KeywordsVIRUS LIKE PARTICLE / bacteriophage / circular permutation
Function / homology
Function and homology information


negative regulation of viral translation / T=3 icosahedral viral capsid / regulation of translation / structural molecule activity / RNA binding / identical protein binding
Similarity search - Function
Levivirus coat protein / Levivirus coat protein / Bacteriophage RNA-type, capsid
Similarity search - Domain/homology
Biological speciesEscherichia phage MS2 (virus)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.62 Å
AuthorsLiang, S. / Jung, J. / Tullman-Ercek, D.
Funding support United States, 1items
OrganizationGrant numberCountry
National Science Foundation (NSF, United States)CBET-2043973. United States
CitationJournal: ACS Nano / Year: 2025
Title: Synthetic Rewiring of Virus-like Particles via Circular Permutation Enables Modular Peptide Display and Protein Encapsulation.
Authors: Shiqi Liang / Kaavya Butaney / Daniel de Castro Assumpção / James Jung / Nolan W Kennedy / Danielle Tullman-Ercek /
Abstract: Virus-like particles (VLPs) are self-assembling nanoparticles derived from viruses with the potential as scaffolds for myriad applications. They are also excellent testbeds for engineering protein ...Virus-like particles (VLPs) are self-assembling nanoparticles derived from viruses with the potential as scaffolds for myriad applications. They are also excellent testbeds for engineering protein superstructures. Engineers often employ techniques such as amino acid substitutions and insertions/deletions. Yet evolution also utilizes circular permutation, a powerful natural strategy that has not been fully explored in engineering self-assembling protein nanoparticles. Here, we demonstrate this technique using the MS2 VLP as a model self-assembling proteinaceous nanoparticle. We constructed a comprehensive circular permutation library of the fused MS2 coat protein dimer construct. The strategy revealed terminal locations, validated via cryo-electron microscopy, that enabled C-terminal peptide tagging and led to a protein encapsulation strategy via covalent bonding - a feature the native coat protein does not permit. Our systematic study demonstrates the power of circular permutation for engineering features as well as quantitatively and systematically exploring VLP structural determinants.
History
DepositionMay 2, 2025Deposition site: RCSB / Processing site: RCSB
Revision 1.0Nov 5, 2025Provider: repository / Type: Initial release
Revision 1.0Nov 5, 2025Data content type: EM metadata / Data content type: EM metadata / Provider: repository / Type: Initial release
Revision 1.0Nov 5, 2025Data content type: FSC / Data content type: FSC / Provider: repository / Type: Initial release
Revision 1.0Nov 5, 2025Data content type: Half map / Part number: 1 / Data content type: Half map / Provider: repository / Type: Initial release
Revision 1.0Nov 5, 2025Data content type: Half map / Part number: 2 / Data content type: Half map / Provider: repository / Type: Initial release
Revision 1.0Nov 5, 2025Data content type: Image / Data content type: Image / Provider: repository / Type: Initial release
Revision 1.0Nov 5, 2025Data content type: Primary map / Data content type: Primary map / Provider: repository / Type: Initial release

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: MS2 CPM58
B: MS2 CPM58


Theoretical massNumber of molelcules
Total (without water)54,9182
Polymers54,9182
Non-polymers00
Water00
1
A: MS2 CPM58
B: MS2 CPM58
x 60


Theoretical massNumber of molelcules
Total (without water)3,295,075120
Polymers3,295,075120
Non-polymers00
Water0
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1
point symmetry operation59
2


  • Idetical with deposited unit
  • icosahedral asymmetric unit
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1
3
A: MS2 CPM58
B: MS2 CPM58
x 5


  • icosahedral pentamer
  • 275 kDa, 10 polymers
Theoretical massNumber of molelcules
Total (without water)274,59010
Polymers274,59010
Non-polymers00
Water0
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1
point symmetry operation4
4
A: MS2 CPM58
B: MS2 CPM58
x 6


  • icosahedral 23 hexamer
  • 330 kDa, 12 polymers
Theoretical massNumber of molelcules
Total (without water)329,50712
Polymers329,50712
Non-polymers00
Water0
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1
point symmetry operation5
5


  • Idetical with deposited unit in distinct coordinate
  • icosahedral asymmetric unit, std point frame
TypeNameSymmetry operationNumber
transform to point frame1
SymmetryPoint symmetry: (Schoenflies symbol: I (icosahedral))

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Components

#1: Protein MS2 CPM58 / CP / Coat protein


Mass: 27458.957 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Escherichia phage MS2 (virus) / Production host: Escherichia coli (E. coli) / References: UniProt: P03612
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: Escherichia phage MS2 / Type: VIRUS / Entity ID: all / Source: RECOMBINANT
Molecular weightValue: 2.4696 MDa / Experimental value: NO
Source (natural)Organism: Escherichia phage MS2 (virus)
Source (recombinant)Organism: Escherichia coli (E. coli)
Details of virusEmpty: YES / Enveloped: NO / Isolate: STRAIN / Type: VIRUS-LIKE PARTICLE
Virus shellName: CPM58 VLP / Diameter: 300 nm / Triangulation number (T number): 3
Buffer solutionpH: 7.2
SpecimenConc.: 2 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportGrid material: COPPER / Grid mesh size: 400 divisions/in. / Grid type: Quantifoil R1.2/1.3
VitrificationInstrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 95 % / Chamber temperature: 288 K

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Electron microscopy imaging

MicroscopyModel: TFS GLACIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 200 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Nominal magnification: 130000 X / Nominal defocus max: 1600 nm / Nominal defocus min: 600 nm / Cs: 2.7 mm / C2 aperture diameter: 20 µm / Alignment procedure: COMA FREE
Specimen holderCryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER / Temperature (min): 77 K
Image recordingAverage exposure time: 5.33 sec. / Electron dose: 60 e/Å2 / Film or detector model: TFS FALCON 4i (4k x 4k) / Num. of grids imaged: 1 / Num. of real images: 5849
EM imaging opticsEnergyfilter name: TFS Selectris / Energyfilter slit width: 10 eV

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Processing

EM software
IDNameVersionCategory
1cryoSPARC4.6.2particle selection
2EPU3.9.1image acquisition
4cryoSPARC4.6.2CTF correction
7Cootmodel fitting
9cryoSPARC4.6.2initial Euler assignment
10cryoSPARC4.6.2final Euler assignment
11cryoSPARC4.6.2classification
12cryoSPARC4.6.23D reconstruction
13PHENIX1.21.2model refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Particle selectionNum. of particles selected: 539975
SymmetryPoint symmetry: I (icosahedral)
3D reconstructionResolution: 2.62 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 109941 / Algorithm: BACK PROJECTION / Num. of class averages: 1 / Symmetry type: POINT
Atomic model buildingProtocol: FLEXIBLE FIT / Space: REAL
Atomic model buildingPDB-ID: 1ZDI

1zdi


Accession code: 1ZDI / Source name: PDB / Type: experimental model
RefinementHighest resolution: 2.62 Å
Stereochemistry target values: REAL-SPACE (WEIGHTED MAP SUM AT ATOM CENTERS)
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.0022945
ELECTRON MICROSCOPYf_angle_d0.4994015
ELECTRON MICROSCOPYf_dihedral_angle_d6.424412
ELECTRON MICROSCOPYf_chiral_restr0.045474
ELECTRON MICROSCOPYf_plane_restr0.004521

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