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- PDB-9q3s: Cryo-EM structure of PGT121 Fab and Rhesus macaque Ab4 Fab in com... -

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Basic information

Entry
Database: PDB / ID: 9q3s
TitleCryo-EM structure of PGT121 Fab and Rhesus macaque Ab4 Fab in complex with HIV-1 Env trimer BG505 SOSIP.664
Components
  • (BG505 SOSIP.664 ...) x 2
  • Ab 4 Fab heavy chain
  • Ab 4 Fab light chain
  • PGT121 Fab heavy chain
  • PGT121 Fab light chain
KeywordsVIRAL PROTEIN/IMMUNE SYSTEM / HIV-1 Env / Broadly-neutralizing antibodies (bNAbs) / glycan hole / CD4-binding site (CD4bs) / VIRAL PROTEIN / VIRAL PROTEIN-IMMUNE SYSTEM complex
Function / homology
Function and homology information


symbiont-mediated perturbation of host defense response / 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 ...symbiont-mediated perturbation of host defense response / 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 / 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 speciesHuman immunodeficiency virus 1
Macaca mulatta (Rhesus monkey)
Homo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.01 Å
AuthorsChandravanshi, M. / Tolbert, W.D. / Pazgier, M.
Funding support United States, 1items
OrganizationGrant numberCountry
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)R01AI174979 United States
CitationJournal: To Be Published
Title: Cryo-EM structure of PGT121 Fab and Rhesus macaque Ab4 Fab in complex with HIV-1 Env trimer BG505 SOSIP.664
Authors: Chandravanshi, M. / Tolbert, W.D. / Pazgier, M.
History
DepositionAug 19, 2025Deposition site: RCSB / Processing site: RCSB
Revision 1.0May 27, 2026Provider: repository / Type: Initial release
Revision 1.0May 27, 2026Data content type: EM metadata / Data content type: EM metadata / Provider: repository / Type: Initial release
Revision 1.0May 27, 2026Data content type: FSC / Data content type: FSC / Provider: repository / Type: Initial release
Revision 1.0May 27, 2026Data content type: Half map / Part number: 1 / Data content type: Half map / Provider: repository / Type: Initial release
Revision 1.0May 27, 2026Data content type: Half map / Part number: 2 / Data content type: Half map / Provider: repository / Type: Initial release
Revision 1.0May 27, 2026Data content type: Image / Data content type: Image / Provider: repository / Type: Initial release
Revision 1.0May 27, 2026Data content type: Primary map / Data content type: Primary map / Provider: repository / Type: Initial release

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
B: BG505 SOSIP.664 gp41
G: BG505 SOSIP.664 gp120
H: Ab 4 Fab heavy chain
L: Ab 4 Fab light chain
h: PGT121 Fab heavy chain
l: PGT121 Fab light chain
C: BG505 SOSIP.664 gp41
A: BG505 SOSIP.664 gp120
D: Ab 4 Fab heavy chain
E: Ab 4 Fab light chain
d: PGT121 Fab heavy chain
e: PGT121 Fab light chain
J: BG505 SOSIP.664 gp41
I: BG505 SOSIP.664 gp120
K: Ab 4 Fab heavy chain
M: Ab 4 Fab light chain
k: PGT121 Fab heavy chain
m: PGT121 Fab light chain
hetero molecules


Theoretical massNumber of molelcules
Total (without water)528,34281
Polymers499,06118
Non-polymers29,28063
Water00
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: electron microscopy, not applicable
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

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BG505 SOSIP.664 ... , 2 types, 6 molecules BCJGAI

#1: Protein BG505 SOSIP.664 gp41


Mass: 17146.482 Da / Num. of mol.: 3
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Human immunodeficiency virus 1 / Gene: env / Production host: Homo sapiens (human) / Strain (production host): HEK 293 GntI- / References: UniProt: Q2N0S5
#2: Protein BG505 SOSIP.664 gp120


Mass: 54064.277 Da / Num. of mol.: 3
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Human immunodeficiency virus 1 / Gene: env / Production host: Homo sapiens (human) / Strain (production host): HEK 293 GNTI- / References: UniProt: Q2N0S5

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Antibody , 4 types, 12 molecules HDKLEMhdklem

#3: Antibody Ab 4 Fab heavy chain


Mass: 24438.240 Da / Num. of mol.: 3
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Macaca mulatta (Rhesus monkey) / Cell line (production host): HEK293 / Production host: Homo sapiens (human)
#4: Antibody Ab 4 Fab light chain


Mass: 22666.242 Da / Num. of mol.: 3
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Macaca mulatta (Rhesus monkey) / Cell line (production host): HEK293 / Production host: Homo sapiens (human)
#5: Antibody PGT121 Fab heavy chain


Mass: 25169.230 Da / Num. of mol.: 3
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Cell line (production host): HEK293 / Production host: Homo sapiens (human)
#6: Antibody PGT121 Fab light chain


Mass: 22869.338 Da / Num. of mol.: 3
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Cell line (production host): HEK293 / Production host: Homo sapiens (human)

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Sugars , 6 types, 63 molecules

#7: Polysaccharide alpha-D-mannopyranose-(1-3)-beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1- ...alpha-D-mannopyranose-(1-3)-beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose


Type: oligosaccharide / Mass: 748.682 Da / Num. of mol.: 3
Source method: isolated from a genetically manipulated source
DescriptorTypeProgram
DManpa1-3DManpb1-4DGlcpNAcb1-4DGlcpNAcb1-ROHGlycam Condensed SequenceGMML 1.0
WURCS=2.0/3,4,3/[a2122h-1b_1-5_2*NCC/3=O][a1122h-1b_1-5][a1122h-1a_1-5]/1-1-2-3/a4-b1_b4-c1_c3-d1WURCSPDB2Glycan 1.1.0
[][D-1-deoxy-GlcpNAc]{[(4+1)][b-D-GlcpNAc]{[(4+1)][b-D-Manp]{[(3+1)][a-D-Manp]{}}}}LINUCSPDB-CARE
#8: Polysaccharide beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta- ...beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose


Type: oligosaccharide / Mass: 586.542 Da / Num. of mol.: 3
Source method: isolated from a genetically manipulated source
DescriptorTypeProgram
DManpb1-4DGlcpNAcb1-4DGlcpNAcb1-ROHGlycam Condensed SequenceGMML 1.0
WURCS=2.0/2,3,2/[a2122h-1b_1-5_2*NCC/3=O][a1122h-1b_1-5]/1-1-2/a4-b1_b4-c1WURCSPDB2Glycan 1.1.0
[][D-1-deoxy-GlcpNAc]{[(4+1)][b-D-GlcpNAc]{[(4+1)][b-D-Manp]{}}}LINUCSPDB-CARE
#9: Polysaccharide...
2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose


Type: oligosaccharide / Mass: 424.401 Da / Num. of mol.: 30
Source method: isolated from a genetically manipulated source
DescriptorTypeProgram
DGlcpNAcb1-4DGlcpNAcb1-ROHGlycam Condensed SequenceGMML 1.0
WURCS=2.0/1,2,1/[a2122h-1b_1-5_2*NCC/3=O]/1-1/a4-b1WURCSPDB2Glycan 1.1.0
[][D-1-deoxy-GlcpNAc]{[(4+1)][b-D-GlcpNAc]{}}LINUCSPDB-CARE
#10: Polysaccharide alpha-D-mannopyranose-(1-2)-alpha-D-mannopyranose-(1-3)-[alpha-D-mannopyranose-(1-6)]beta-D- ...alpha-D-mannopyranose-(1-2)-alpha-D-mannopyranose-(1-3)-[alpha-D-mannopyranose-(1-6)]beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose


Type: oligosaccharide / Mass: 1072.964 Da / Num. of mol.: 3
Source method: isolated from a genetically manipulated source
DescriptorTypeProgram
DManpa1-2DManpa1-3[DManpa1-6]DManpb1-4DGlcpNAcb1-4DGlcpNAcb1-ROHGlycam Condensed SequenceGMML 1.0
WURCS=2.0/3,6,5/[a2122h-1b_1-5_2*NCC/3=O][a1122h-1b_1-5][a1122h-1a_1-5]/1-1-2-3-3-3/a4-b1_b4-c1_c3-d1_c6-f1_d2-e1WURCSPDB2Glycan 1.1.0
[][D-1-deoxy-GlcpNAc]{[(4+1)][b-D-GlcpNAc]{[(4+1)][b-D-Manp]{[(3+1)][a-D-Manp]{[(2+1)][a-D-Manp]{}}[(6+1)][a-D-Manp]{}}}}LINUCSPDB-CARE
#11: Polysaccharide alpha-D-mannopyranose-(1-2)-alpha-D-mannopyranose-(1-2)-alpha-D-mannopyranose-(1-3)-[alpha-D- ...alpha-D-mannopyranose-(1-2)-alpha-D-mannopyranose-(1-2)-alpha-D-mannopyranose-(1-3)-[alpha-D-mannopyranose-(1-3)-[alpha-D-mannopyranose-(1-6)]alpha-D-mannopyranose-(1-6)]beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose


Type: oligosaccharide / Mass: 1559.386 Da / Num. of mol.: 3
Source method: isolated from a genetically manipulated source
DescriptorTypeProgram
DManpa1-2DManpa1-2DManpa1-3[DManpa1-3[DManpa1-6]DManpa1-6]DManpb1-4DGlcpNAcb1-4DGlcpNAcb1-ROHGlycam Condensed SequenceGMML 1.0
WURCS=2.0/3,9,8/[a2122h-1b_1-5_2*NCC/3=O][a1122h-1b_1-5][a1122h-1a_1-5]/1-1-2-3-3-3-3-3-3/a4-b1_b4-c1_c3-d1_c6-g1_d2-e1_e2-f1_g3-h1_g6-i1WURCSPDB2Glycan 1.1.0
[][D-1-deoxy-GlcpNAc]{[(4+1)][b-D-GlcpNAc]{[(4+1)][b-D-Manp]{[(3+1)][a-D-Manp]{[(2+1)][a-D-Manp]{[(2+1)][a-D-Manp]{}}}[(6+1)][a-D-Manp]{[(3+1)][a-D-Manp]{}[(6+1)][a-D-Manp]{}}}}}LINUCSPDB-CARE
#12: Sugar...
ChemComp-NAG / 2-acetamido-2-deoxy-beta-D-glucopyranose / N-acetyl-beta-D-glucosamine / 2-acetamido-2-deoxy-beta-D-glucose / 2-acetamido-2-deoxy-D-glucose / 2-acetamido-2-deoxy-glucose / N-ACETYL-D-GLUCOSAMINE


Type: D-saccharide, beta linking / Mass: 221.208 Da / Num. of mol.: 21
Source method: isolated from a genetically manipulated source
Formula: C8H15NO6
IdentifierTypeProgram
DGlcpNAcbCONDENSED IUPAC CARBOHYDRATE SYMBOLGMML 1.0
N-acetyl-b-D-glucopyranosamineCOMMON NAMEGMML 1.0
b-D-GlcpNAcIUPAC CARBOHYDRATE SYMBOLPDB-CARE 1.0
GlcNAcSNFG CARBOHYDRATE SYMBOLGMML 1.0

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Details

Has ligand of interestN
Has protein modificationY

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Experimental details

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Experiment

ExperimentMethod: ELECTRON MICROSCOPY
EM experimentAggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction

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Sample preparation

Component
IDNameTypeEntity IDParent-IDSource
1BG505 SOSIP.664 HIV envelope glycoprotein trimer in complex with PGT121 Fab and Rhesus macaque Ab4 Fab.COMPLEX#1-#60MULTIPLE SOURCES
2BG505 SOSIP.664 HIV envelope glycoprotein trimer.COMPLEX#1-#21RECOMBINANT
3Rhesus macaque Ab4COMPLEX#3-#41RECOMBINANT
4PGT121 FabCOMPLEX#5-#61RECOMBINANT
Source (natural)
IDEntity assembly-IDOrganismNcbi tax-ID
32Human immunodeficiency virus 111676
43Macaca mulatta (Rhesus monkey)9544
54Homo sapiens (human)9606
Source (recombinant)
IDEntity assembly-IDOrganismNcbi tax-ID
32Homo sapiens (human)9606
43Homo sapiens (human)9606
54Homo sapiens (human)9606
Buffer solutionpH: 7.4
Buffer component
IDConc.NameFormulaBuffer-ID
1137 mMSodium ChlorideNaCl1
22.7 mMPotassium ChlorideKCl1
310 mMSodium PhosphateNa2HPO41
41.8 mMPotassium PhosphateKH2PO41
SpecimenConc.: 1.6 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportGrid material: COPPER / Grid mesh size: 300 divisions/in. / Grid type: Quantifoil R2/1
VitrificationInstrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 291.15 K

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Electron microscopy imaging

MicroscopyModel: JEOL CRYO ARM 200
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 200 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Nominal defocus max: 2000 nm / Nominal defocus min: 500 nm
Image recordingElectron dose: 60 e/Å2 / Film or detector model: GATAN K3 (6k x 4k)

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Processing

EM software
IDNameCategory
1cryoSPARCparticle selection
13cryoSPARC3D reconstruction
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Particle selectionNum. of particles selected: 2392293
Symmetry
IDImage processing-IDEntry-IDPoint symmetry
119Q3SC3 (3 fold cyclic)
219Q3SC3 (3 fold cyclic)
3D reconstruction
IDResolution (Å)Resolution methodNum. of particlesImage processing-IDEntry-IDSymmetry type
13.01FSC 0.143 CUT-OFF43669419Q3SPOINT
23.01FSC 0.143 CUT-OFF43669419Q3SPOINT
RefinementHighest resolution: 3.01 Å

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