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- EMDB-5280: Poliovirus 135S particle and P1 Fab complex at 12-angs. resolution -

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Basic information

Entry
Database: EMDB / ID: EMD-5280
TitlePoliovirus 135S particle and P1 Fab complex at 12-angs. resolution
Map dataThis is a map of poliovirus 135S and P1 Fab complex at 12-ang resolution
Sample
  • Sample: Poliovirus 135S particle and P1(monospecific antibody) Fab complex
  • Virus: Human poliovirus 1 Mahoney
Keywordspicornavirus / viral cell entry / viral uncoating / virus-antibody complex / virus-Fab complex / virus disassembly / virus uncoating / virus conformational transitions / monospecific antibody
Biological speciesHuman poliovirus 1 Mahoney
Methodsingle particle reconstruction / cryo EM / Resolution: 12.0 Å
AuthorsLin J / Cheng N / Chow M / Filman DJ / Steven AC / Hogle JM / Belnap DM
CitationJournal: J Virol / Year: 2011
Title: An externalized polypeptide partitions between two distinct sites on genome-released poliovirus particles.
Authors: Jun Lin / Naiqian Cheng / Marie Chow / David J Filman / Alasdair C Steven / James M Hogle / David M Belnap /
Abstract: During cell entry, native poliovirus (160S) converts to a cell-entry intermediate (135S) particle, resulting in the externalization of capsid proteins VP4 and the amino terminus of VP1 (residues 1 to ...During cell entry, native poliovirus (160S) converts to a cell-entry intermediate (135S) particle, resulting in the externalization of capsid proteins VP4 and the amino terminus of VP1 (residues 1 to 53). Externalization of these entities is followed by release of the RNA genome (uncoating), leaving an empty (80S) particle. The antigen-binding fragment (Fab) of a monospecific peptide 1 (P1) antibody, which was raised against a peptide corresponding to amino-terminal residues 24 to 40 of VP1, was utilized to track the location of the amino terminus of VP1 in the 135S and 80S states of poliovirus particles via cryogenic electron microscopy (cryo-EM) and three-dimensional image reconstruction. On 135S, P1 Fabs bind to a prominent feature on the external surface known as the "propeller tip." In contrast, our initial 80S-P1 reconstruction showed P1 Fabs also binding to a second site, at least 50 Å distant, at the icosahedral 2-fold axes. Further analysis showed that the overall population of 80S-P1 particles consisted of three kinds of capsids: those with P1 Fabs bound only at the propeller tips, P1 Fabs bound only at the 2-fold axes, or P1 Fabs simultaneously bound at both positions. Our results indicate that, in 80S particles, a significant fraction of VP1 can deviate from icosahedral symmetry. Hence, this portion of VP1 does not change conformation synchronously when switching from the 135S state. These conclusions are compatible with previous observations of multiple conformations of the 80S state and suggest that movement of the amino terminus of VP1 has a role in uncoating. Similar deviations from icosahedral symmetry may be biologically significant during other viral transitions.
History
DepositionMay 2, 2011-
Header (metadata) releaseMay 5, 2011-
Map releaseMar 8, 2012-
UpdateOct 3, 2012-
Current statusOct 3, 2012Processing site: RCSB / Status: Released

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Structure visualization

Movie
  • Surface view with section colored by density value
  • Surface level: 8.6
  • Imaged by UCSF Chimera
  • Download
  • Surface view colored by radius
  • Surface level: 8.6
  • Imaged by UCSF Chimera
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Movie viewer
Structure viewerEM map:
SurfViewMolmilJmol/JSmol
Supplemental images

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Map

FileDownload / File: emd_5280.map.gz / Format: CCP4 / Size: 70.9 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
AnnotationThis is a map of poliovirus 135S and P1 Fab complex at 12-ang resolution
Voxel sizeX=Y=Z: 1.83 Å
Density
Contour LevelBy AUTHOR: 8.6 / Movie #1: 8.6
Minimum - Maximum-31.677835460000001 - 96.891075130000004
Average (Standard dev.)5.0518713 (±17.715793609999999)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin-133-133-133
Dimensions267267267
Spacing267267267
CellA=B=C: 488.61002 Å
α=β=γ: 90.0 °

CCP4 map header:

modeImage stored as Reals
Å/pix. X/Y/Z1.831.831.83
M x/y/z267267267
origin x/y/z0.0000.0000.000
length x/y/z488.610488.610488.610
α/β/γ90.00090.00090.000
start NX/NY/NZ-62-62-62
NX/NY/NZ125125125
MAP C/R/S123
start NC/NR/NS-133-133-133
NC/NR/NS267267267
D min/max/mean-31.67896.8915.052

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Supplemental data

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Sample components

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Entire : Poliovirus 135S particle and P1(monospecific antibody) Fab complex

EntireName: Poliovirus 135S particle and P1(monospecific antibody) Fab complex
Components
  • Sample: Poliovirus 135S particle and P1(monospecific antibody) Fab complex
  • Virus: Human poliovirus 1 Mahoney

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Supramolecule #1000: Poliovirus 135S particle and P1(monospecific antibody) Fab complex

SupramoleculeName: Poliovirus 135S particle and P1(monospecific antibody) Fab complex
type: sample / ID: 1000 / Oligomeric state: 135S particle icosahedral with Fab / Number unique components: 2

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Supramolecule #1: Human poliovirus 1 Mahoney

SupramoleculeName: Human poliovirus 1 Mahoney / type: virus / ID: 1 / Name.synonym: poliovirus 135S
Details: native virus 160S is converted by heat-treatment to 135S
NCBI-ID: 12081 / Sci species name: Human poliovirus 1 Mahoney / Database: NCBI / Virus type: VIRION / Virus isolate: STRAIN / Virus enveloped: No / Virus empty: No / Syn species name: poliovirus 135S
Host (natural)Organism: Homo sapiens (human) / synonym: VERTEBRATES
Virus shellShell ID: 1 / Diameter: 340 Å / T number (triangulation number): 1

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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

BufferpH: 7.5 / Details: 20 mM Tris, 2 mM CaCl2
VitrificationCryogen name: ETHANE / Instrument: OTHER
Details: Vitrification carried out in ambient atmosphere. Ethane cooled by liquid nitrogen.
Method: Blotted manually before plunging

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Electron microscopy

MicroscopeFEI/PHILIPS CM200FEG
Electron beamAcceleration voltage: 120 kV / Electron source: FIELD EMISSION GUN
Electron opticsCalibrated magnification: 37752 / Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELDBright-field microscopy / Cs: 2 mm / Nominal defocus max: 2.24 µm / Nominal defocus min: 0.81 µm / Nominal magnification: 38000
Sample stageSpecimen holder: Side entry liquid nitrogen-cooled cryo specimen holder
Specimen holder model: GATAN LIQUID NITROGEN
Alignment procedureLegacy - Astigmatism: Bsoft
DateJul 15, 1999
Image recordingCategory: FILM / Film or detector model: KODAK SO-163 FILM / Digitization - Scanner: ZEISS SCAI / Digitization - Sampling interval: 7 µm / Number real images: 14 / Average electron dose: 10 e/Å2 / Details: Defocal pairs were used. / Bits/pixel: 8
Tilt angle min0
Tilt angle max0

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Image processing

CTF correctionDetails: CTF and decay correction of each particle
Final reconstructionAlgorithm: OTHER / Resolution.type: BY AUTHOR / Resolution: 12.0 Å / Resolution method: FSC 0.5 CUT-OFF / Software - Name: EM3DR2
Details: Reconstruction computed from focal pairs. Pairs not summed for reconstruction calculation.
Number images used: 10160

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