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- EMDB-70705: nsEM map of macaque LJ66 week 4 polyclonal Fab in complex with BG... -

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Basic information

Entry
Database: EMDB / ID: EMD-70705
TitlensEM map of macaque LJ66 week 4 polyclonal Fab in complex with BG505-CH505dN241
Map dataLJ66 week 4 in complex with DT-Prime
Sample
  • Complex: macaque LJ66 week 4 polyclonal Fab in complex with BG505-CH505dN241
    • Complex: BG505-CH505 chimera
KeywordsHIV / fusion peptide / negative-stain / Env / VIRAL PROTEIN
Biological speciesMacaca mulatta (Rhesus monkey) / Human immunodeficiency virus 1
Methodsingle particle reconstruction / negative staining / Resolution: 25.0 Å
AuthorsPratap PP / Ozorowski G / Ward AB
Funding support United States, 1 items
OrganizationGrant numberCountry
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID) United States
CitationJournal: bioRxiv / Year: 2025
Title: Immunofocusing on the conserved fusion peptide of HIV envelope glycoprotein in rhesus macaques.
Authors: Payal P Pratap / Christopher A Cottrell / James Quinn / Diane G Carnathan / Daniel L V Bader / Andy S Tran / Chiamaka A Enemuo / Julia T Ngo / Sara T Richey / Hongmei Gao / Xiaoying Shen / ...Authors: Payal P Pratap / Christopher A Cottrell / James Quinn / Diane G Carnathan / Daniel L V Bader / Andy S Tran / Chiamaka A Enemuo / Julia T Ngo / Sara T Richey / Hongmei Gao / Xiaoying Shen / Kelli M Greene / Jonathan Hurtado / Katarzyna Kaczmarek Michaels / Elana Ben-Akiva / Ashley Lemnios / Mariane B Melo / Joel D Allen / Gabriel Ozorowski / Max Crispin / Bryan Briney / David Montefiori / Guido Silvestri / Darrell J Irvine / Shane Crotty / Andrew B Ward /
Abstract: During infection, the fusion peptide (FP) of HIV envelope glycoprotein (Env) serves a central role in viral fusion with the host cell. As such, the FP is highly conserved and therefore an attractive ...During infection, the fusion peptide (FP) of HIV envelope glycoprotein (Env) serves a central role in viral fusion with the host cell. As such, the FP is highly conserved and therefore an attractive epitope for vaccine design. Here, we describe a vaccination study in non-human primates (NHPs) where glycan deletions were made on soluble HIV Env to increase FP epitope exposure. When delivered via implantable osmotic pumps, this immunogen primed immune responses against the FP, which were then boosted with heterologous trimers resulting in a focused immune response targeting the conserved FP epitope. Although autologous immunizations did not elicit high affinity FP-targeting antibodies, the conserved FP epitope on a heterologous trimer further matured the lower affinity, FP-targeting B cells. This study suggests using epitope conservation strategies on distinct Env trimer immunogens can focus humoral responses on desired neutralizing epitopes and suppress immune-distracting antibody responses against non-neutralizing epitopes.
History
DepositionMay 19, 2025-
Header (metadata) releaseJun 25, 2025-
Map releaseJun 25, 2025-
UpdateJul 23, 2025-
Current statusJul 23, 2025Processing site: RCSB / Status: Released

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Structure visualization

Supplemental images

emd_70705.png

Downloads & links

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Map

FileDownload / File: emd_70705.map.gz / Format: CCP4 / Size: 27 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
AnnotationLJ66 week 4 in complex with DT-Prime
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
1.98 Å/pix.
x 192 pix.
= 380.16 Å		1.98 Å/pix.
x 192 pix.
= 380.16 Å		1.98 Å/pix.
x 192 pix.
= 380.16 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 1.98 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.02
Minimum - Maximum-0.04851982 - 0.118358225
Average (Standard dev.)0.00038785074 (±0.006130465)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions192192192
Spacing192192192
CellA=B=C: 380.16 Å
α=β=γ: 90.0 °

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Supplemental data

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Half map: Half map 1

Fileemd_70705_half_map_1.map
AnnotationHalf map 1
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: half map 2

Fileemd_70705_half_map_2.map
Annotationhalf map 2
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Sample components

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Entire : macaque LJ66 week 4 polyclonal Fab in complex with BG505-CH505dN241

EntireName: macaque LJ66 week 4 polyclonal Fab in complex with BG505-CH505dN241
Components
  • Complex: macaque LJ66 week 4 polyclonal Fab in complex with BG505-CH505dN241
    • Complex: BG505-CH505 chimera

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Supramolecule #1: macaque LJ66 week 4 polyclonal Fab in complex with BG505-CH505dN241

SupramoleculeName: macaque LJ66 week 4 polyclonal Fab in complex with BG505-CH505dN241
type: complex / ID: 1 / Parent: 0
Source (natural)Organism: Macaca mulatta (Rhesus monkey)

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Supramolecule #2: BG505-CH505 chimera

SupramoleculeName: BG505-CH505 chimera / type: complex / ID: 2 / Parent: 1 / Details: without N241 glycan
Source (natural)Organism: Human immunodeficiency virus 1

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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 / Details: Tris Buffer Saline pH 7.4
StainingType: NEGATIVE / Material: uranyl formate
GridModel: Homemade / Material: COPPER / Mesh: 400 / Support film - Material: CARBON / Support film - topology: CONTINUOUS / Pretreatment - Type: GLOW DISCHARGE

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Electron microscopy

MicroscopeTFS TALOS
Image recordingFilm or detector model: FEI CETA (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: BRIGHT FIELD / Nominal defocus max: 1.5 µm / Nominal defocus min: 1.0 µm
Sample stageCooling holder cryogen: NITROGEN

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Image processing

CTF correctionType: NONE
Startup modelType of model: PDB ENTRY
PDB model - PDB ID:

6v0r


Details: converted coordinates to map using UCSF Chimera molmap and low pass filtered to 20 A
Final reconstructionApplied symmetry - Point group: C1 (asymmetric) / Resolution.type: BY AUTHOR / Resolution: 25.0 Å / Resolution method: FSC 0.5 CUT-OFF / Software - Name: RELION / Number images used: 11472
Initial angle assignmentType: MAXIMUM LIKELIHOOD
Final angle assignmentType: MAXIMUM LIKELIHOOD

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