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- EMDB-46655: Cryo-EM structure of partially open HIV-1 BG505 SOSIP.664 Env bou... -

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Entry
Database: EMDB / ID: EMD-46655
TitleCryo-EM structure of partially open HIV-1 BG505 SOSIP.664 Env bound to 3-sCD4, 3-17b Fab and 3-VRC34.01 Fab, Population 1
Map dataHIV-1 BG505 SOSIP.664 Env bound to 3-sCD4, 3-17b Fab and 3-VRC34.01 Fab
Sample
  • Complex: A Complex of ectodomain of HIV-1 BG505 SOSIP.664 Env with sCD4, 17b Fab and VRC34.01 Fab
    • Protein or peptide: VRC34.01 heavy chain
    • Protein or peptide: VRC34.01 light chain
    • Protein or peptide: T-cell surface glycoprotein CD4
    • Protein or peptide: 17b Fab light chain
    • Protein or peptide: 17b Fab heavy chain
  • Protein or peptide: Surface protein gp120
  • Protein or peptide: Transmembrane protein gp41
  • Ligand: 2-acetamido-2-deoxy-beta-D-glucopyranose
KeywordsRecombinantly purified HIV-1 Env / sCD4 / 17b Fab and VRC34.01 Fab / viral Env / vaccine / VIRAL PROTEIN / VIRAL PROTEIN-IMMUNE SYSTEM complex
Function / homology
Function and homology information


helper T cell enhancement of adaptive immune response / interleukin-16 binding / interleukin-16 receptor activity / response to methamphetamine hydrochloride / maintenance of protein location in cell / cellular response to ionomycin / T cell selection / MHC class II protein binding / positive regulation of kinase activity / interleukin-15-mediated signaling pathway ...helper T cell enhancement of adaptive immune response / interleukin-16 binding / interleukin-16 receptor activity / response to methamphetamine hydrochloride / maintenance of protein location in cell / cellular response to ionomycin / T cell selection / MHC class II protein binding / positive regulation of kinase activity / interleukin-15-mediated signaling pathway / cellular response to granulocyte macrophage colony-stimulating factor stimulus / positive regulation of monocyte differentiation / Nef Mediated CD4 Down-regulation / Alpha-defensins / regulation of T cell activation / response to vitamin D / extracellular matrix structural constituent / Other interleukin signaling / T cell receptor complex / enzyme-linked receptor protein signaling pathway / Translocation of ZAP-70 to Immunological synapse / Phosphorylation of CD3 and TCR zeta chains / positive regulation of protein kinase activity / regulation of calcium ion transport / positive regulation of calcium ion transport into cytosol / macrophage differentiation / Generation of second messenger molecules / immunoglobulin binding / T cell differentiation / Co-inhibition by PD-1 / Binding and entry of HIV virion / coreceptor activity / positive regulation of plasma membrane raft polarization / positive regulation of receptor clustering / positive regulation of T cell proliferation / positive regulation of interleukin-2 production / positive regulation of calcium-mediated signaling / cell surface receptor protein tyrosine kinase signaling pathway / protein tyrosine kinase binding / host cell endosome membrane / Vpu mediated degradation of CD4 / clathrin-coated endocytic vesicle membrane / calcium-mediated signaling / positive regulation of protein phosphorylation / MHC class II protein complex binding / transmembrane signaling receptor activity / Downstream TCR signaling / Cargo recognition for clathrin-mediated endocytosis / response to estradiol / signaling receptor activity / Clathrin-mediated endocytosis / virus receptor activity / response to ethanol / defense response to Gram-negative bacterium / clathrin-dependent endocytosis of virus by host cell / adaptive immune response / positive regulation of viral entry into host cell / early endosome / cell surface receptor signaling pathway / positive regulation of ERK1 and ERK2 cascade / positive regulation of canonical NF-kappaB signal transduction / cell adhesion / positive regulation of MAPK cascade / viral protein processing / immune response / membrane raft / endoplasmic reticulum lumen / fusion of virus membrane with host plasma membrane / external side of plasma membrane / fusion of virus membrane with host endosome membrane / viral envelope / lipid binding / symbiont entry into host cell / endoplasmic reticulum membrane / protein kinase binding / positive regulation of DNA-templated transcription / virion attachment to host cell / host cell plasma membrane / virion membrane / structural molecule activity / enzyme binding / signal transduction / protein homodimerization activity / zinc ion binding / identical protein binding / membrane / plasma membrane
Similarity search - Function
CD4, extracellular / T cell CD4 receptor C-terminal region / CD4, extracellular / T cell CD4 receptor C terminal region / T-cell surface antigen CD4 / Immunoglobulin C2-set / Immunoglobulin C2-set domain / Immunoglobulin / Immunoglobulin domain / Envelope glycoprotein Gp160 ...CD4, extracellular / T cell CD4 receptor C-terminal region / CD4, extracellular / T cell CD4 receptor C terminal region / T-cell surface antigen CD4 / Immunoglobulin C2-set / Immunoglobulin C2-set domain / Immunoglobulin / Immunoglobulin domain / Envelope glycoprotein Gp160 / Retroviral envelope protein / Retroviral envelope protein GP41-like / Gp120 core superfamily / Envelope glycoprotein GP120 / Human immunodeficiency virus 1, envelope glycoprotein Gp120 / Immunoglobulin subtype 2 / Immunoglobulin C-2 Type / Immunoglobulin V-Type / Immunoglobulin V-set domain / Immunoglobulin subtype / Immunoglobulin / Ig-like domain profile. / Immunoglobulin-like domain / Immunoglobulin-like domain superfamily / Immunoglobulin-like fold
Similarity search - Domain/homology
T-cell surface glycoprotein CD4 / Envelope glycoprotein gp160
Similarity search - Component
Biological speciesHuman immunodeficiency virus 1 / Homo sapiens (human)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.91 Å
AuthorsThakur B / Acharya P
Funding support United States, 2 items
OrganizationGrant numberCountry
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)R01 AI145687 United States
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)U54 AI170752 United States
CitationJournal: Nat Commun / Year: 2025
Title: Conformational trajectory of the HIV-1 fusion peptide during CD4-induced envelope opening.
Authors: Bhishem Thakur / Revansiddha H Katte / Wang Xu / Katarzyna Janowska / Salam Sammour / Rory Henderson / Maolin Lu / Peter D Kwong / Priyamvada Acharya /
Abstract: The hydrophobic fusion peptide (FP), a critical component of the HIV-1 entry machinery, is located at the N terminus of the envelope (Env) gp41 subunit. The receptor-binding gp120 subunit of Env ...The hydrophobic fusion peptide (FP), a critical component of the HIV-1 entry machinery, is located at the N terminus of the envelope (Env) gp41 subunit. The receptor-binding gp120 subunit of Env forms a heterodimer with gp41. The gp120/gp41 heterodimer assembles into a homotrimer, in which FP is accessible for antibody binding. Env conformational changes or "opening" that follow receptor binding result in FP relocating to a newly formed interprotomer pocket at the gp41-gp120 interface where it is sterically inaccessible to antibodies. The mechanistic steps connecting the entry-related transition of antibody accessible-to-inaccessible FP configurations remain unresolved. Here, using SOSIP-stabilized Env ectodomains, we visualize that the FP remains accessible for antibody binding despite substantial receptor-induced Env opening. We delineate stepwise Env opening from its closed state to a functional CD4-bound symmetrically open Env in which we show that FP was accessible for antibody binding. We define downstream re-organizations that lead to the formation of a gp120/gp41 cavity into which the FP buries to become inaccessible for antibody binding. These findings improve our understanding of HIV-1 entry and delineate the entry-related conformational trajectory of a key site of HIV vulnerability to neutralizing antibody.
History
DepositionAug 20, 2024-
Header (metadata) releaseApr 30, 2025-
Map releaseApr 30, 2025-
UpdateOct 1, 2025-
Current statusOct 1, 2025Processing site: RCSB / Status: Released

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Structure visualization

Supplemental images

emd_46655.png

Downloads & links

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Map

FileDownload / File: emd_46655.map.gz / Format: CCP4 / Size: 125 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
AnnotationHIV-1 BG505 SOSIP.664 Env bound to 3-sCD4, 3-17b Fab and 3-VRC34.01 Fab
Projections & slices

Image control

Size
Brightness
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Others
AxesZ (Sec.)Y (Row.)X (Col.)
1.08 Å/pix.
x 320 pix.
= 345.6 Å		1.08 Å/pix.
x 320 pix.
= 345.6 Å		1.08 Å/pix.
x 320 pix.
= 345.6 Å

Surface

Projections

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Images are generated by Spider.

Voxel sizeX=Y=Z: 1.08 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.123
Minimum - Maximum-0.7005571 - 1.1403302
Average (Standard dev.)0.0009394741 (±0.027041126)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions320320320
Spacing320320320
CellA=B=C: 345.6 Å
α=β=γ: 90.0 °

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Supplemental data

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Half map: #2

Fileemd_46655_half_map_1.map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: #1

Fileemd_46655_half_map_2.map
Projections & Slices
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Histogram

Histogram (log scale)

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Sample components

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Entire : A Complex of ectodomain of HIV-1 BG505 SOSIP.664 Env with sCD4, 1...

EntireName: A Complex of ectodomain of HIV-1 BG505 SOSIP.664 Env with sCD4, 17b Fab and VRC34.01 Fab
Components
  • Complex: A Complex of ectodomain of HIV-1 BG505 SOSIP.664 Env with sCD4, 17b Fab and VRC34.01 Fab
    • Protein or peptide: VRC34.01 heavy chain
    • Protein or peptide: VRC34.01 light chain
    • Protein or peptide: T-cell surface glycoprotein CD4
    • Protein or peptide: 17b Fab light chain
    • Protein or peptide: 17b Fab heavy chain
  • Protein or peptide: Surface protein gp120
  • Protein or peptide: Transmembrane protein gp41
  • Ligand: 2-acetamido-2-deoxy-beta-D-glucopyranose

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Supramolecule #1: A Complex of ectodomain of HIV-1 BG505 SOSIP.664 Env with sCD4, 1...

SupramoleculeName: A Complex of ectodomain of HIV-1 BG505 SOSIP.664 Env with sCD4, 17b Fab and VRC34.01 Fab
type: complex / ID: 1 / Parent: 0 / Macromolecule list: #3-#7
Molecular weightTheoretical: 300 KDa

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Macromolecule #1: Surface protein gp120

MacromoleculeName: Surface protein gp120 / type: protein_or_peptide / ID: 1 / Number of copies: 3 / Enantiomer: LEVO
Source (natural)Organism: Human immunodeficiency virus 1
Molecular weightTheoretical: 52.508406 KDa
Recombinant expressionOrganism: Mammalia (mammals)
SequenceString: NLWVTVYYGV PVWKDAETTL FCASDAKAYE TEKHNVWATH ACVPTDPNPQ EIHLENVTEE FNMWKNNMVE QMHTDIISLW DQSLKPCVK LTPLCVTLQC TNVTNNITDD MRGELKNCSF NMTTELRDKK QKVYSLFYRL DVVQINENQG NRSNNSNKEY R LINCNTSA ...String:
NLWVTVYYGV PVWKDAETTL FCASDAKAYE TEKHNVWATH ACVPTDPNPQ EIHLENVTEE FNMWKNNMVE QMHTDIISLW DQSLKPCVK LTPLCVTLQC TNVTNNITDD MRGELKNCSF NMTTELRDKK QKVYSLFYRL DVVQINENQG NRSNNSNKEY R LINCNTSA ITQACPKVSF EPIPIHYCAP AGFAILKCKD KKFNGTGPCP SVSTVQCTHG IKPVVSTQLL LNGSLAEEEV MI RSENITN NAKNILVQFN TPVQINCTRP NNNTRKSIRI GPGQAFYATG DIIGDIRQAH CNVSKATWNE TLGKVVKQLR KHF GNNTII RFANSSGGDL EVTTHSFNCG GEFFYCNTSG LFNSTWISNT SVQGSNSTGS NDSITLPCRI KQIINMWQRI GQAM YAPPI QGVIRCVSNI TGLILTRDGG STNSTTETFR PGGGDMRDNW RSELYKYKVV KIEPLGVAPT RCKR

UniProtKB: Envelope glycoprotein gp160

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Macromolecule #2: Transmembrane protein gp41

MacromoleculeName: Transmembrane protein gp41 / type: protein_or_peptide / ID: 2 / Number of copies: 3 / Enantiomer: LEVO
Source (natural)Organism: Human immunodeficiency virus 1
Molecular weightTheoretical: 16.733998 KDa
Recombinant expressionOrganism: Mammalia (mammals)
SequenceString:
AVGIGAVFLG FLGAAGSTMG AASMTLTVQA RNLLSGIVQQ QSNLLRAPEA QQHLLKLTVW GIKQLQARVL AVERYLRDQQ LLGIWGCSG KLICCTNVPW NSSWSNRNLS EIWDNMTWLQ WDKEISNYTQ IIYGLLEESQ NQQEKNEQDL

UniProtKB: Envelope glycoprotein gp160

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Macromolecule #3: VRC34.01 heavy chain

MacromoleculeName: VRC34.01 heavy chain / type: protein_or_peptide / ID: 3 / Number of copies: 3 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 23.797615 KDa
Recombinant expressionOrganism: Mammalia (mammals)
SequenceString: QEVLVQSGAE VKKPGASVKV SCRAFGYTFT GNALHWVRQA PGQGLEWLGW INPHSGDTTT SQKFQGRVYM TRDKSINTAF LDVTRLTSD DTGIYYCARD KYYGNEAVGM DVWGQGTSVT VSSASTKGPS VFPLAPSSKS TSGGTAALGC LVKDYFPEPV T VSWNSGAL ...String:
QEVLVQSGAE VKKPGASVKV SCRAFGYTFT GNALHWVRQA PGQGLEWLGW INPHSGDTTT SQKFQGRVYM TRDKSINTAF LDVTRLTSD DTGIYYCARD KYYGNEAVGM DVWGQGTSVT VSSASTKGPS VFPLAPSSKS TSGGTAALGC LVKDYFPEPV T VSWNSGAL TSGVHTFPAV LQSSGLYSLS SVVTVPSSSL GTQTYICNVN HKPSNTKVDK KVEPK

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Macromolecule #4: VRC34.01 light chain

MacromoleculeName: VRC34.01 light chain / type: protein_or_peptide / ID: 4 / Number of copies: 3 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 23.138766 KDa
Recombinant expressionOrganism: Mammalia (mammals)
SequenceString: DIQLTQSPSF LSASVGDKVT ITCRASQGVR NELAWYQQKP GKAPNLLIYY ASTLQSGVPS RFSATGSGTH FTLTVSSLQP EDFATYFCQ HMSSYPLTFG GGTKVEIKRT VAAPSVFIFP PSDEQLKSGT ASVVCLLNNF YPREAKVQWK VDNALQSGNS Q ESVTEQDS ...String:
DIQLTQSPSF LSASVGDKVT ITCRASQGVR NELAWYQQKP GKAPNLLIYY ASTLQSGVPS RFSATGSGTH FTLTVSSLQP EDFATYFCQ HMSSYPLTFG GGTKVEIKRT VAAPSVFIFP PSDEQLKSGT ASVVCLLNNF YPREAKVQWK VDNALQSGNS Q ESVTEQDS KDSTYSLSST LTLSKADYEK HKVYACEVTH QGLSSPVTKS FNRG

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Macromolecule #5: T-cell surface glycoprotein CD4

MacromoleculeName: T-cell surface glycoprotein CD4 / type: protein_or_peptide / ID: 5 / Number of copies: 3 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 20.129896 KDa
Recombinant expressionOrganism: Mammalia (mammals)
SequenceString:
KKVVLGKKGD TVELTCTASQ KKSIQFHWKN SNQIKILGNQ GSFLTKGPSK LNDRADSRRS LWDQGNFPLI IKNLKIEDSD TYICEVEDQ KEEVQLLVFG LTANSDTHLL QGQSLTLTLE SPPGSSPSVQ CRSPRGKNIQ GGKTLSVSQL ELQDSGTWTC T VLQNQKKV EFKIDIVVLA FQK

UniProtKB: T-cell surface glycoprotein CD4

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Macromolecule #6: 17b Fab light chain

MacromoleculeName: 17b Fab light chain / type: protein_or_peptide / ID: 6 / Number of copies: 3 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 23.399898 KDa
Recombinant expressionOrganism: Mammalia (mammals)
SequenceString: DIVMTQSPAT LSVSPGERAT LSCRASESVS SDLAWYQQKP GQAPRLLIYG ASTRATGVPA RFSGSGSGAE FTLTISSLQS EDFAVYYCQ QYNNWPPRYT FGQGTRLEIK RTVAAPSVFI FPPSDEQLKS GTASVVCLLN NFYPREAKVQ WKVDNALQSG N SQESVTEQ ...String:
DIVMTQSPAT LSVSPGERAT LSCRASESVS SDLAWYQQKP GQAPRLLIYG ASTRATGVPA RFSGSGSGAE FTLTISSLQS EDFAVYYCQ QYNNWPPRYT FGQGTRLEIK RTVAAPSVFI FPPSDEQLKS GTASVVCLLN NFYPREAKVQ WKVDNALQSG N SQESVTEQ DSKDSTYSLS STLTLSKADY EKHKVYACEV THQGLSSPVT KSFNRG

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Macromolecule #7: 17b Fab heavy chain

MacromoleculeName: 17b Fab heavy chain / type: protein_or_peptide / ID: 7 / Number of copies: 3 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 24.457387 KDa
Recombinant expressionOrganism: Mammalia (mammals)
SequenceString: EVQLVESGAE VKKPGSSVKV SCKASGDTFI RYSFTWVRQA PGQGLEWMGR IITILDVAHY APHLQGRVTI TADKSTSTVY LELRNLRSD DTAVYFCAGV YEGEADEGEY DNNGFLKHWG QGTLVTVSSA STKGPSVFPL APSSKSTSGG TAALGCLVKD Y FPEPVTVS ...String:
EVQLVESGAE VKKPGSSVKV SCKASGDTFI RYSFTWVRQA PGQGLEWMGR IITILDVAHY APHLQGRVTI TADKSTSTVY LELRNLRSD DTAVYFCAGV YEGEADEGEY DNNGFLKHWG QGTLVTVSSA STKGPSVFPL APSSKSTSGG TAALGCLVKD Y FPEPVTVS WNSGALTSGV HTFPAVLQSS GLYSLSSVVT VPSSSLGTQT YICNVNHKPS NTKVDKKVEP K

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Macromolecule #9: 2-acetamido-2-deoxy-beta-D-glucopyranose

MacromoleculeName: 2-acetamido-2-deoxy-beta-D-glucopyranose / type: ligand / ID: 9 / Number of copies: 3 / 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

Concentration1.3 mg/mL
BufferpH: 8
GridModel: Quantifoil R1.2/1.3 / Material: COPPER / Mesh: 300 / Support film - Material: CARBON / Support film - topology: HOLEY / Pretreatment - Type: GLOW DISCHARGE / Pretreatment - Time: 20 sec.
VitrificationCryogen name: ETHANE / Chamber humidity: 95 % / Chamber temperature: 298 K / Instrument: LEICA EM CPC

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Electron microscopy

MicroscopeTFS KRIOS
Image recordingFilm or detector model: GATAN K3 (6k x 4k) / Average electron dose: 58.7 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal defocus max: 2.4 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

Particle selectionNumber selected: 14427340
CTF correctionSoftware - Name: cryoSPARC / Type: PHASE FLIPPING AND AMPLITUDE CORRECTION
Startup modelType of model: INSILICO MODEL
Final reconstructionResolution.type: BY AUTHOR / Resolution: 3.91 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: cryoSPARC / Number images used: 1028498
Initial angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: cryoSPARC
Final angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: cryoSPARC
Final 3D classificationSoftware - Name: cryoSPARC
FSC plot (resolution estimation)

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Atomic model buiding 1

RefinementSpace: REAL
Output model

PDB-9d90:
Cryo-EM structure of partially open HIV-1 BG505 SOSIP.664 Env bound to 3-sCD4, 3-17b Fab and 3-VRC34.01 Fab, Population 1

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