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- EMDB-43999: HIV CH505/BG505 SOSIP.v8.1 Env in Complex with V1/V3 Epitope and ... -

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Basic information

Entry
Database: EMDB / ID: EMD-43999
TitleHIV CH505/BG505 SOSIP.v8.1 Env in Complex with V1/V3 Epitope and Anti-Immune Complex pAbs from Rabbit 2474
Map data
Sample
  • Complex: HIV Ch505/BG505 SOSIP Env in Complex with V1/V3 and Anti-Immune Complex pAbs
    • Protein or peptide: Rabbit Anti-Immune Complex pAb - Predicted Light Chain
    • Protein or peptide: Transmembrane protein gp41
    • Protein or peptide: Surface protein gp120
    • Protein or peptide: Rabbit V1/V3 Epitope pAb - Predicted Light Chain
    • Protein or peptide: Rabbit V1/V3 Epitope pAb - Predicted Heavy Chain
  • Ligand: 2-acetamido-2-deoxy-beta-D-glucopyranose
KeywordsHIV / EMPEM / Polyclonal Antibodies / Rabbit / V1/V3 / Anti-Immune Complex / SOSIP / VIRAL PROTEIN
Function / homology
Function and homology information


positive regulation of plasma membrane raft polarization / positive regulation of receptor clustering / host cell endosome membrane / clathrin-dependent endocytosis of virus by host cell / viral protein processing / fusion of virus membrane with host plasma membrane / fusion of virus membrane with host endosome membrane / viral envelope / virion attachment to host cell / host cell plasma membrane ...positive regulation of plasma membrane raft polarization / positive regulation of receptor clustering / host cell endosome membrane / clathrin-dependent endocytosis of virus by host cell / viral protein processing / fusion of virus membrane with host plasma membrane / fusion of virus membrane with host endosome membrane / viral envelope / virion attachment to host cell / host cell plasma membrane / virion membrane / structural molecule activity / identical protein binding / membrane
Similarity search - Function
Envelope glycoprotein Gp160 / Retroviral envelope protein / Retroviral envelope protein GP41-like / Gp120 core superfamily / Envelope glycoprotein GP120 / Human immunodeficiency virus 1, envelope glycoprotein Gp120
Similarity search - Domain/homology
Envelope glycoprotein gp160
Similarity search - Component
Biological speciesOryctolagus cuniculus (rabbit) / Human immunodeficiency virus 1
Methodsingle particle reconstruction / cryo EM / Resolution: 4.4 Å
AuthorsBrown S / Antanasijevic A / Ward AB
Funding support United States, 2 items
OrganizationGrant numberCountry
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)R01 AI136621 United States
Bill & Melinda Gates FoundationUM1 AI100663 United States
CitationJournal: Sci Immunol / Year: 2025
Title: Anti-immune complex antibodies are elicited during repeated immunization with HIV Env immunogens.
Authors: Sharidan Brown / Aleksandar Antanasijevic / Leigh M Sewall / Daniel Montiel Garcia / James Ferguson / Philip J M Brouwer / Rogier W Sanders / Andrew B Ward /
Abstract: Vaccination strategies against HIV-1 aim to elicit broadly neutralizing antibodies (bnAbs) using prime-boost regimens with HIV envelope (Env) immunogens. Epitope mapping has shown that early antibody ...Vaccination strategies against HIV-1 aim to elicit broadly neutralizing antibodies (bnAbs) using prime-boost regimens with HIV envelope (Env) immunogens. Epitope mapping has shown that early antibody responses are directed to easily accessible nonneutralizing epitopes on Env instead of bnAb epitopes. Autologously neutralizing antibody responses appear upon boosting, once immunodominant epitopes are saturated. Here, we use electron microscopy-based polyclonal epitope mapping (EMPEM) to elucidate how repeated immunization with HIV Env SOSIP immunogens results in the generation of Ab2α anti-idiotypic antibodies in rabbits and rhesus macaques. We present the structures of six anti-immune complex antibodies and find that they target idiotopes composed of framework regions of antibodies bound to Env. Examination of cryo-electron microscopy density enabled prediction of sequences for an anti-immune complex antibody, the paratope of which is enriched with aromatic amino acids. This work sheds light on current vaccine development efforts for HIV, as well as for other pathogens in which repeated exposure to antigen is required.
History
DepositionMar 8, 2024-
Header (metadata) releaseJan 29, 2025-
Map releaseJan 29, 2025-
UpdateMay 28, 2025-
Current statusMay 28, 2025Processing site: RCSB / Status: Released

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Structure visualization

Supplemental images

emd_43999.png

Downloads & links

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Map

FileDownload / File: emd_43999.map.gz / Format: CCP4 / Size: 178 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

Size
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AxesZ (Sec.)Y (Row.)X (Col.)
1.05 Å/pix.
x 360 pix.
= 376.2 Å		1.05 Å/pix.
x 360 pix.
= 376.2 Å		1.05 Å/pix.
x 360 pix.
= 376.2 Å

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Images are generated by Spider.

Voxel sizeX=Y=Z: 1.045 Å
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Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.007
Minimum - Maximum-0.018798728 - 0.032133035
Average (Standard dev.)0.000062210536 (±0.0012214312)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions360360360
Spacing360360360
CellA=B=C: 376.19998 Å
α=β=γ: 90.0 °

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Supplemental data

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Mask #1

Fileemd_43999_msk_1.map
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Half map: #2

Fileemd_43999_half_map_1.map
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Half map: #1

Fileemd_43999_half_map_2.map
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Sample components

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Entire : HIV Ch505/BG505 SOSIP Env in Complex with V1/V3 and Anti-Immune C...

EntireName: HIV Ch505/BG505 SOSIP Env in Complex with V1/V3 and Anti-Immune Complex pAbs
Components
  • Complex: HIV Ch505/BG505 SOSIP Env in Complex with V1/V3 and Anti-Immune Complex pAbs
    • Protein or peptide: Rabbit Anti-Immune Complex pAb - Predicted Light Chain
    • Protein or peptide: Transmembrane protein gp41
    • Protein or peptide: Surface protein gp120
    • Protein or peptide: Rabbit V1/V3 Epitope pAb - Predicted Light Chain
    • Protein or peptide: Rabbit V1/V3 Epitope pAb - Predicted Heavy Chain
  • Ligand: 2-acetamido-2-deoxy-beta-D-glucopyranose

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Supramolecule #1: HIV Ch505/BG505 SOSIP Env in Complex with V1/V3 and Anti-Immune C...

SupramoleculeName: HIV Ch505/BG505 SOSIP Env in Complex with V1/V3 and Anti-Immune Complex pAbs
type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#5
Source (natural)Organism: Oryctolagus cuniculus (rabbit)

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Macromolecule #1: Rabbit Anti-Immune Complex pAb - Predicted Light Chain

MacromoleculeName: Rabbit Anti-Immune Complex pAb - Predicted Light Chain
type: protein_or_peptide / ID: 1
Details: The polyclonal antibody has an unknown sequence and is modeled as a poly-UNK chain.
Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Oryctolagus cuniculus (rabbit)
Molecular weightTheoretical: 8.698714 KDa
SequenceString: (UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK) (UNK)(UNK)(UNK)(UNK)(UNK)(UNK) (UNK)(UNK)(UNK) (UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK) (UNK)(UNK)(UNK) (UNK)(UNK)(UNK)(UNK)(UNK) ...String:
(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK) (UNK)(UNK)(UNK)(UNK)(UNK)(UNK) (UNK)(UNK)(UNK) (UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK) (UNK)(UNK)(UNK) (UNK)(UNK)(UNK)(UNK)(UNK)(UNK) (UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK) (UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK) (UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK) (UNK)(UNK) (UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK) (UNK)(UNK)(UNK)(UNK) (UNK)(UNK)(UNK)(UNK)(UNK) (UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK) (UNK) (UNK)(UNK)(UNK)(UNK)(UNK)(UNK)

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Macromolecule #2: Transmembrane protein gp41

MacromoleculeName: Transmembrane protein gp41 / type: protein_or_peptide / ID: 2 / Details: The sequence contains engineered SOSIP mutations. / Number of copies: 3 / Enantiomer: LEVO
Source (natural)Organism: Human immunodeficiency virus 1
Molecular weightTheoretical: 17.454738 KDa
Recombinant expressionOrganism: Homo sapiens (human)
SequenceString:
RRAVGIGAVS LGFLGAAGST MGAASMTLTV QARNLLSGIV QQQSNLLRAP ECQQHLLKDT HWGIKQLQAR VLAVEHYLRD QQLLGIWGC SGKLICCTNV PWNSSWSNRN LSEIWDNMTW LQWDKEISNY TQIIYGLLEE SQNQQEKNEQ DLLALD

UniProtKB: Envelope glycoprotein gp160

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Macromolecule #3: Surface protein gp120

MacromoleculeName: Surface protein gp120 / type: protein_or_peptide / ID: 3 / Details: The sequence contains engineered SOSIP mutations. / Number of copies: 3 / Enantiomer: LEVO
Source (natural)Organism: Human immunodeficiency virus 1
Molecular weightTheoretical: 56.377289 KDa
Recombinant expressionOrganism: Homo sapiens (human)
SequenceString: MDAMKRGLCC VLLLCGAVFV SPSQEIHARF RRGARAENLW VTVYYGVPVW KDAETTLFCA SDAKAYETEK RNVWATHCCV PTDPNPQEI HLENVTEEFN MWKNNMVEQM HEDIISLWDQ SLKPCVKLTP LCVTLNCTNA TASNSSIIEG MKNCSFNITT E LRDKREKK ...String:
MDAMKRGLCC VLLLCGAVFV SPSQEIHARF RRGARAENLW VTVYYGVPVW KDAETTLFCA SDAKAYETEK RNVWATHCCV PTDPNPQEI HLENVTEEFN MWKNNMVEQM HEDIISLWDQ SLKPCVKLTP LCVTLNCTNA TASNSSIIEG MKNCSFNITT E LRDKREKK NALFYKLDIV QLDGNSSQYR LINCNTSAIT QACPKVSFEP IPIHYCAPAG FAILKCNNKT FTGTGPCNNV ST VQCTHGI KPVVSTQLLL NGSLAEGEII IRSENITNNV KTILVHLNES VKIECTRPNN KTVTSIRIGP GQWFYAYGQV IGD IREAYC NINESTWNET LGKVVKQLRK HFGNNTIIRF QPSSGGDLEV TTHSFNCGGE FFYCNTSGLF NSTWISNTSV QGSN STGSN DSITLPCRIK QIINMWQRVG QAMYAPPIQG VIRCVSNITG LILTRDGGKN NTETFRPGGG DMRDNWRSEL YKYKV VKIE PLGVAPTRCK RRVVGRRRR

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Macromolecule #4: Rabbit V1/V3 Epitope pAb - Predicted Light Chain

MacromoleculeName: Rabbit V1/V3 Epitope pAb - Predicted Light Chain / type: protein_or_peptide / ID: 4
Details: The polyclonal antibody has an unknown sequence and is modeled as a poly-UNK chain.
Number of copies: 2 / Enantiomer: LEVO
Source (natural)Organism: Oryctolagus cuniculus (rabbit)
Molecular weightTheoretical: 8.273189 KDa
SequenceString: (UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK) (UNK)(UNK)(UNK)(UNK)(UNK)(UNK) (UNK)(UNK)(UNK) (UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK) (UNK)(UNK)(UNK) (UNK)(UNK)(UNK)(UNK)(UNK) ...String:
(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK) (UNK)(UNK)(UNK)(UNK)(UNK)(UNK) (UNK)(UNK)(UNK) (UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK) (UNK)(UNK)(UNK) (UNK)(UNK)(UNK)(UNK)(UNK)(UNK) (UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK) (UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK) (UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK) (UNK)(UNK) (UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK) (UNK)(UNK)(UNK)(UNK) (UNK)(UNK)(UNK)(UNK)(UNK) (UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK) (UNK) (UNK)

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Macromolecule #5: Rabbit V1/V3 Epitope pAb - Predicted Heavy Chain

MacromoleculeName: Rabbit V1/V3 Epitope pAb - Predicted Heavy Chain / type: protein_or_peptide / ID: 5
Details: The polyclonal antibody has an unknown sequence and is modeled as a poly-UNK chain.
Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Oryctolagus cuniculus (rabbit)
Molecular weightTheoretical: 9.294448 KDa
SequenceString: (UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK) (UNK)(UNK)(UNK)(UNK)(UNK)(UNK) (UNK)(UNK)(UNK) (UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK) (UNK)(UNK)(UNK) (UNK)(UNK)(UNK)(UNK)(UNK) ...String:
(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK) (UNK)(UNK)(UNK)(UNK)(UNK)(UNK) (UNK)(UNK)(UNK) (UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK) (UNK)(UNK)(UNK) (UNK)(UNK)(UNK)(UNK)(UNK)(UNK) (UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK) (UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK) (UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK) (UNK)(UNK) (UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK) (UNK)(UNK)(UNK)(UNK) (UNK)(UNK)(UNK)(UNK)(UNK) (UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK) (UNK) (UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK) (UNK)(UNK)(UNK)(UNK)(UNK)

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Macromolecule #10: 2-acetamido-2-deoxy-beta-D-glucopyranose

MacromoleculeName: 2-acetamido-2-deoxy-beta-D-glucopyranose / type: ligand / ID: 10 / Number of copies: 38 / Formula: NAG
Molecular weightTheoretical: 221.208 Da
Chemical component information

ChemComp-NAG:
2-acetamido-2-deoxy-beta-D-glucopyranose

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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

Concentration6.5 mg/mL
BufferpH: 7.4
GridModel: Quantifoil R1.2/1.3 / Material: COPPER / Mesh: 300 / Support film - Material: CARBON / Support film - topology: HOLEY / Pretreatment - Type: GLOW DISCHARGE
VitrificationCryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 283 K / Instrument: FEI VITROBOT MARK IV

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Electron microscopy

MicroscopeTFS KRIOS
Image recordingFilm or detector model: GATAN K3 (6k x 4k) / Number real images: 5946 / Average electron dose: 49.8 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal defocus max: 1.6 µm / Nominal defocus min: 0.8 µm
Sample stageCooling holder cryogen: NITROGEN
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Startup modelType of model: OTHER
Details: Initial model generated from a low pass filtered map of BG505 SOSIP.
Final reconstructionApplied symmetry - Point group: C1 (asymmetric) / Resolution.type: BY AUTHOR / Resolution: 4.4 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: RELION (ver. 3.0) / Number images used: 24189
Initial angle assignmentType: MAXIMUM LIKELIHOOD
Final angle assignmentType: MAXIMUM LIKELIHOOD
FSC plot (resolution estimation)

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