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- EMDB-26494: Cryo-EM map of BG24 Fabs with an inferred germline light chain an... -

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Basic information

Entry
Database: EMDB / ID: EMD-26494
TitleCryo-EM map of BG24 Fabs with an inferred germline light chain and 10-1074 Fabs in complex with HIV-1 Env immunogen BG505-SOSIPv4.1-GT1 containing the N276 gp120 glycan- Class 2
Map data
Sample
  • Complex: Cryo-EM map of BG24 Fabs with an inferred germline light chain and 10-1074 Fabs in complex with HIV-1 Env immunogen BG505-SOSIPv4.1-GT1 containing the N276 gp120 glycan- Class 2
Biological speciesHuman immunodeficiency virus 1
Methodsingle particle reconstruction / cryo EM / Resolution: 4.6 Å
AuthorsDam KA / Bjorkman PJ
Funding support United States, 2 items
OrganizationGrant numberCountry
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)HIVRAD P01 AI100148 United States
Bill & Melinda Gates FoundationCAVD INV-002143 United States
CitationJournal: Nat Commun / Year: 2022
Title: HIV-1 CD4-binding site germline antibody-Env structures inform vaccine design.
Authors: Kim-Marie A Dam / Christopher O Barnes / Harry B Gristick / Till Schoofs / Priyanthi N P Gnanapragasam / Michel C Nussenzweig / Pamela J Bjorkman /
Abstract: BG24, a VRC01-class broadly neutralizing antibody (bNAb) against HIV-1 Env with relatively few somatic hypermutations (SHMs), represents a promising target for vaccine strategies to elicit CD4- ...BG24, a VRC01-class broadly neutralizing antibody (bNAb) against HIV-1 Env with relatively few somatic hypermutations (SHMs), represents a promising target for vaccine strategies to elicit CD4-binding site (CD4bs) bNAbs. To understand how SHMs correlate with BG24 neutralization of HIV-1, we report 4.1 Å and 3.4 Å single-particle cryo-EM structures of two inferred germline (iGL) BG24 precursors complexed with engineered Env-based immunogens lacking CD4bs N-glycans. Structures reveal critical Env contacts by BG24 and identify antibody light chain structural features that impede Env recognition. In addition, biochemical data and cryo-EM structures of BG24 variants bound to Envs with CD4bs glycans present provide insights into N-glycan accommodation, including structural modes of light chain adaptations in the presence of the N276 glycan. Together, these findings reveal Env regions critical for germline antibody recognition and potential sites to alter in immunogen design.
History
DepositionMar 25, 2022-
Header (metadata) releaseNov 16, 2022-
Map releaseNov 16, 2022-
UpdateNov 16, 2022-
Current statusNov 16, 2022Processing site: RCSB / Status: Released

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Structure visualization

Supplemental images

emd_26494.png

Downloads & links

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Map

FileDownload / File: emd_26494.map.gz / Format: CCP4 / Size: 178 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
0.87 Å/pix.
x 360 pix.
= 312.84 Å		0.87 Å/pix.
x 360 pix.
= 312.84 Å		0.87 Å/pix.
x 360 pix.
= 312.84 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 0.869 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.01
Minimum - Maximum-0.012159286 - 0.039157562
Average (Standard dev.)0.0002385941 (±0.0016391719)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions360360360
Spacing360360360
CellA=B=C: 312.84 Å
α=β=γ: 90.0 °

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Supplemental data

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Half map: #1

Fileemd_26494_half_map_1.map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: #2

Fileemd_26494_half_map_2.map
Projections & Slices
AxesZYX

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Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Sample components

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Entire : Cryo-EM map of BG24 Fabs with an inferred germline light chain an...

EntireName: Cryo-EM map of BG24 Fabs with an inferred germline light chain and 10-1074 Fabs in complex with HIV-1 Env immunogen BG505-SOSIPv4.1-GT1 containing the N276 gp120 glycan- Class 2
Components
  • Complex: Cryo-EM map of BG24 Fabs with an inferred germline light chain and 10-1074 Fabs in complex with HIV-1 Env immunogen BG505-SOSIPv4.1-GT1 containing the N276 gp120 glycan- Class 2

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Supramolecule #1: Cryo-EM map of BG24 Fabs with an inferred germline light chain an...

SupramoleculeName: Cryo-EM map of BG24 Fabs with an inferred germline light chain and 10-1074 Fabs in complex with HIV-1 Env immunogen BG505-SOSIPv4.1-GT1 containing the N276 gp120 glycan- Class 2
type: complex / Chimera: Yes / ID: 1 / Parent: 0 / Macromolecule list: #1-#6
Source (natural)Organism: Human immunodeficiency virus 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: 8
VitrificationCryogen name: ETHANE / Instrument: FEI VITROBOT MARK IV

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Electron microscopy

MicroscopeFEI TALOS ARCTICA
Image recordingFilm or detector model: GATAN K3 BIOQUANTUM (6k x 4k) / Average electron dose: 60.0 e/Å2
Electron beamAcceleration voltage: 200 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Cs: 2.7 mm / Nominal defocus max: 3.0 µm / Nominal defocus min: 1.2 µm
Sample stageCooling holder cryogen: NITROGEN
Experimental equipment
Model: Talos Arctica / Image courtesy: FEI Company

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Image processing

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

5cez


Details: Closed conformation Env trimer (gp120/gp41 subunits) low-pass filtered to 80 angstrom
Final reconstructionResolution.type: BY AUTHOR / Resolution: 4.6 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 26412
Initial angle assignmentType: RANDOM ASSIGNMENT
Final angle assignmentType: ANGULAR RECONSTITUTION

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