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- EMDB-21181: EM-Based Polyclonal Epitope Mapping. ConM-SOSIP Complexed with Pu... -

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Basic information

Entry
Database: EMDB / ID: EMD-21181
TitleEM-Based Polyclonal Epitope Mapping. ConM-SOSIP Complexed with Purified Polyclonal Fab (Grp 2, ID r2383 Wk22)
Map data
SampleConM-SOSIP.v9 complexed with purified polyclonal Fab from an immunized rabbit (Grp 2, ID r2383, Wk22):
ConM-SOSIP.v9
Biological speciessynthetic construct (others)
Methodsingle particle reconstruction / negative staining / Resolution: 17.11 Å
AuthorsWard AB / Antanasijevic A
Funding support United States, 1 items
OrganizationGrant numberCountry
Bill & Melinda Gates FoundationOPP1115782 United States
CitationJournal: PLoS Pathog / Year: 2020
Title: Structural and functional evaluation of de novo-designed, two-component nanoparticle carriers for HIV Env trimer immunogens.
Authors: Aleksandar Antanasijevic / George Ueda / Philip J M Brouwer / Jeffrey Copps / Deli Huang / Joel D Allen / Christopher A Cottrell / Anila Yasmeen / Leigh M Sewall / Ilja Bontjer / Thomas J ...Authors: Aleksandar Antanasijevic / George Ueda / Philip J M Brouwer / Jeffrey Copps / Deli Huang / Joel D Allen / Christopher A Cottrell / Anila Yasmeen / Leigh M Sewall / Ilja Bontjer / Thomas J Ketas / Hannah L Turner / Zachary T Berndsen / David C Montefiori / Per Johan Klasse / Max Crispin / David Nemazee / John P Moore / Rogier W Sanders / Neil P King / David Baker / Andrew B Ward /
Abstract: Two-component, self-assembling nanoparticles represent a versatile platform for multivalent presentation of viral antigens. Computational design of protein nanoparticles with differing sizes and ...Two-component, self-assembling nanoparticles represent a versatile platform for multivalent presentation of viral antigens. Computational design of protein nanoparticles with differing sizes and geometries enables combination with antigens of choice to test novel multimerization concepts in immunization strategies where the goal is to improve the induction and maturation of neutralizing antibody lineages. Here, we describe detailed antigenic, structural, and functional characterization of computationally designed tetrahedral, octahedral, and icosahedral nanoparticle immunogens displaying trimeric HIV envelope glycoprotein (Env) ectodomains. Env trimers, based on subtype A (BG505) or consensus group M (ConM) sequences and engineered with SOSIP stabilizing mutations, were fused to an underlying trimeric building block of each nanoparticle. Initial screening yielded one icosahedral and two tetrahedral nanoparticle candidates, capable of presenting twenty or four copies of the Env trimer. A number of analyses, including detailed structural characterization by cryo-EM, demonstrated that the nanoparticle immunogens possessed the intended structural and antigenic properties. When the immunogenicity of ConM-SOSIP trimers presented on a two-component tetrahedral nanoparticle or as soluble proteins were compared in rabbits, the two immunogens elicited similar serum antibody binding titers against the trimer component. Neutralizing antibody titers were slightly elevated in the animals given the nanoparticle immunogen and were initially more focused to the trimer apex. Altogether, our findings indicate that tetrahedral nanoparticles can be successfully applied for presentation of HIV Env trimer immunogens; however, the optimal implementation to different immunization strategies remains to be determined.
History
DepositionJan 5, 2020-
Header (metadata) releaseJan 29, 2020-
Map releaseJul 22, 2020-
UpdateAug 26, 2020-
Current statusAug 26, 2020Processing site: RCSB / Status: Released

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Structure visualization

Movie
  • Surface view with section colored by density value
  • Surface level: 0.02
  • Imaged by UCSF Chimera
  • Download
  • Surface view colored by cylindrical radius
  • Surface level: 0.02
  • Imaged by UCSF Chimera
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Movie viewer
Structure viewerEM map:
SurfViewMolmilJmol/JSmol
Supplemental images

Downloads & links

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Map

FileDownload / File: emd_21181.map.gz / Format: CCP4 / Size: 27 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
2.05 Å/pix.
x 192 pix.
= 393.6 Å
2.05 Å/pix.
x 192 pix.
= 393.6 Å
2.05 Å/pix.
x 192 pix.
= 393.6 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 2.05 Å
Density
Contour LevelBy AUTHOR: 0.02 / Movie #1: 0.02
Minimum - Maximum-0.041275192 - 0.092213415
Average (Standard dev.)0.00002909988 (±0.004784481)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions192192192
Spacing192192192
CellA=B=C: 393.59998 Å
α=β=γ: 90.0 °

CCP4 map header:

modeImage stored as Reals
Å/pix. X/Y/Z2.052.052.05
M x/y/z192192192
origin x/y/z0.0000.0000.000
length x/y/z393.600393.600393.600
α/β/γ90.00090.00090.000
MAP C/R/S123
start NC/NR/NS000
NC/NR/NS192192192
D min/max/mean-0.0410.0920.000

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Supplemental data

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Sample components

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Entire ConM-SOSIP.v9 complexed with purified polyclonal Fab from an immu...

EntireName: ConM-SOSIP.v9 complexed with purified polyclonal Fab from an immunized rabbit (Grp 2, ID r2383, Wk22)
Number of components: 2

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Component #1: protein, ConM-SOSIP.v9 complexed with purified polyclonal Fab fro...

ProteinName: ConM-SOSIP.v9 complexed with purified polyclonal Fab from an immunized rabbit (Grp 2, ID r2383, Wk22)
Recombinant expression: No
SourceSpecies: synthetic construct (others)
Source (engineered)Expression System: Homo sapiens (human) / Vector: pPPI4 / Strain: HEK293F

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Component #2: protein, ConM-SOSIP.v9

ProteinName: ConM-SOSIP.v9 / Recombinant expression: No
SourceSpecies: synthetic construct (others)
Source (engineered)Expression System: Homo sapiens (human)

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Experimental details

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Sample preparation

SpecimenSpecimen state: Particle / Method: negative staining
Sample solutionSpecimen conc.: 0.05 mg/mL / Buffer solution: TBS buffer, pH 7.4 / pH: 7.4
StainingSample diluted to 0.05 mg/mL. 3 uL was applied onto the grid, blotted off, and then stained with 2% uranyl formate for 60 seconds.
VitrificationCryogen name: NONE

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Electron microscopy imaging

Experimental equipment
Model: Tecnai Spirit / Image courtesy: FEI Company
ImagingMicroscope: FEI TECNAI SPIRIT
Electron gunElectron source: LAB6 / Accelerating voltage: 120 kV / Electron dose: 25 e/Å2 / Illumination mode: FLOOD BEAM
LensCs: 2.7 mm / Imaging mode: BRIGHT FIELD / Defocus: 1500.0 nm
Specimen HolderModel: OTHER
CameraDetector: TVIPS TEMCAM-F416 (4k x 4k)

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Image processing

ProcessingMethod: single particle reconstruction / Applied symmetry: C1 (asymmetric) / Number of projections: 61933
3D reconstructionAlgorithm: BACK PROJECTION / Software: RELION / Resolution: 17.11 Å / Resolution method: FSC 0.143 CUT-OFF

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