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- EMDB-22568: Polyclonal immune complex of Fab binding the stem of H1 HA from s... -

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Basic information

Entry
Database: EMDB / ID: EMD-22568
TitlePolyclonal immune complex of Fab binding the stem of H1 HA from serum of subject 43 at day 21
Map dataPolyclonal immune complex of Fab binding the stem of H1 HA from serum of subject 43 at day 21
Sample
  • Complex: Polyclonal immune complex of Fab binding the stem of H1 HA from serum of subject 43 at day 21
Biological speciesHomo sapiens (human)
Methodsingle particle reconstruction / negative staining / Resolution: 20.0 Å
AuthorsWard A / Han J / Richey ST
Funding support United States, 1 items
OrganizationGrant numberCountry
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)75N93019C00051 United States
CitationJournal: Cell Rep / Year: 2021
Title: Polyclonal epitope mapping reveals temporal dynamics and diversity of human antibody responses to H5N1 vaccination.
Authors: Julianna Han / Aaron J Schmitz / Sara T Richey / Ya-Nan Dai / Hannah L Turner / Bassem M Mohammed / Daved H Fremont / Ali H Ellebedy / Andrew B Ward /
Abstract: Novel influenza A virus (IAV) strains elicit recall immune responses to conserved epitopes, making them favorable antigenic choices for universal influenza virus vaccines. Evaluating these immunogens ...Novel influenza A virus (IAV) strains elicit recall immune responses to conserved epitopes, making them favorable antigenic choices for universal influenza virus vaccines. Evaluating these immunogens requires a thorough understanding of the antigenic sites targeted by the polyclonal antibody (pAb) response, which single-particle electron microscopy (EM) can sensitively detect. In this study, we employ EM polyclonal epitope mapping (EMPEM) to extensively characterize the pAb response to hemagglutinin (HA) after H5N1 immunization in humans. Cross-reactive pAbs originating from memory B cells immediately bound the stem of HA and persisted for more than a year after vaccination. In contrast, de novo pAb responses to multiple sites on the head of HA, targeting previously determined key neutralizing sites on H5 HA, expanded after the second immunization and waned quickly. Thus, EMPEM provides a robust tool for comprehensively tracking the specificity and durability of immune responses elicited by novel universal influenza vaccine candidates.
History
DepositionSep 2, 2020-
Header (metadata) releaseFeb 10, 2021-
Map releaseFeb 10, 2021-
UpdateFeb 10, 2021-
Current statusFeb 10, 2021Processing site: RCSB / Status: Released

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Structure visualization

Movie
  • Surface view with section colored by density value
  • Surface level: 0.0166
  • Imaged by UCSF Chimera
  • Download
  • Surface view colored by cylindrical radius
  • Surface level: 0.0166
  • Imaged by UCSF Chimera
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Movie viewer
Structure viewerEM map:
SurfViewMolmilJmol/JSmol
Supplemental images

emd_22568.png

Downloads & links

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Map

FileDownload / File: emd_22568.map.gz / Format: CCP4 / Size: 15.6 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
AnnotationPolyclonal immune complex of Fab binding the stem of H1 HA from serum of subject 43 at day 21
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
1.77 Å/pix.
x 160 pix.
= 283.2 Å		1.77 Å/pix.
x 160 pix.
= 283.2 Å		1.77 Å/pix.
x 160 pix.
= 283.2 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 1.77 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.0166 / Movie #1: 0.0166
Minimum - Maximum-0.04580124 - 0.10503954
Average (Standard dev.)0.00015682497 (±0.0064846957)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions160160160
Spacing160160160
CellA=B=C: 283.2 Å
α=β=γ: 90.0 °

CCP4 map header:

modeImage stored as Reals
Å/pix. X/Y/Z1.771.771.77
M x/y/z160160160
origin x/y/z0.0000.0000.000
length x/y/z283.200283.200283.200
α/β/γ90.00090.00090.000
MAP C/R/S123
start NC/NR/NS000
NC/NR/NS160160160
D min/max/mean-0.0460.1050.000

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Supplemental data

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Sample components

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Entire : Polyclonal immune complex of Fab binding the stem of H1 HA from s...

EntireName: Polyclonal immune complex of Fab binding the stem of H1 HA from serum of subject 43 at day 21
Components
  • Complex: Polyclonal immune complex of Fab binding the stem of H1 HA from serum of subject 43 at day 21

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Supramolecule #1: Polyclonal immune complex of Fab binding the stem of H1 HA from s...

SupramoleculeName: Polyclonal immune complex of Fab binding the stem of H1 HA from serum of subject 43 at day 21
type: complex / ID: 1 / Parent: 0
Source (natural)Organism: Homo sapiens (human) / Location in cell: PBMC

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Experimental details

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Structure determination

Methodnegative staining
Processingsingle particle reconstruction
Aggregation stateparticle

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Sample preparation

BufferpH: 7.4
StainingType: NEGATIVE / Material: 2% w/v uranyl formate

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Electron microscopy

MicroscopeFEI TECNAI F20
Image recordingFilm or detector model: TVIPS TEMCAM-F416 (4k x 4k) / Average electron dose: 25.0 e/Å2
Electron beamAcceleration voltage: 200 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: DARK FIELD
Experimental equipment
Model: Tecnai F20 / Image courtesy: FEI Company

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Image processing

Startup modelType of model: PDB ENTRY
PDB model - PDB ID:

4k62

Final reconstructionResolution.type: BY AUTHOR / Resolution: 20.0 Å / Resolution method: FSC 0.5 CUT-OFF / Number images used: 1207
Initial angle assignmentType: ANGULAR RECONSTITUTION
Final angle assignmentType: ANGULAR RECONSTITUTION

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