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- PDB-9p6g: eN49P7-FRv1-23 Fab in complex with BG505 MD39 SOSIP and RM20A3 Fab -

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Basic information

Entry
Database: PDB / ID: 9p6g
TitleeN49P7-FRv1-23 Fab in complex with BG505 MD39 SOSIP and RM20A3 Fab
Components
  • (Envelope glycoprotein ...) x 2
  • (eN49P7-FRv1-23 ...) x 2
  • RM20A3 heavy chain
  • RM20A3 light chain
KeywordsVIRAL PROTEIN / antibody engineering / HIV-1 / bnAb / broadly neutralizing antibody / CD4 binding site / Env
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 / identical protein binding
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 / 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: 2.7 Å
AuthorsPhulera, S. / Ozorowski, G. / Ward, A.B.
Funding support1items
OrganizationGrant numberCountry
Not funded
CitationJournal: bioRxiv / Year: 2025
Title: Engineering HIV antibodies with enhanced breadth and potency of neutralization through multistate affinity maturation.
Authors: Mateusz Kędzior / Swastik Phulera / Monica L Fernández-Quintero / Johannes R Loeffler / Collin Joyce / Jordan Woehl / Abdolrahim Abbasi / Maryam Karimi / Arash Aslanabadi / Mahsa Hojabri / ...Authors: Mateusz Kędzior / Swastik Phulera / Monica L Fernández-Quintero / Johannes R Loeffler / Collin Joyce / Jordan Woehl / Abdolrahim Abbasi / Maryam Karimi / Arash Aslanabadi / Mahsa Hojabri / Roza Zareidoodeji / Ben Atkinson / Eduar Fernando Pinzon Burgos / Alonso Heredia / Karen Saye-Francisco / Quoc Tran / Yoojin Kim / Fernando Acosta-Puente / Lara Shahin / Amelia Zhou / Pilar X Altman / Nathaniel R Felbinger / Brian G Pierce / Devin Sok / Michael S Seaman / Dennis R Burton / Anthony L DeVico / Andrew B Ward / Gabriel Ozorowski / Mohammad M Sajadi / Joseph G Jardine /
Abstract: Broadly neutralizing antibodies (bnAbs) against HIV hold promise as therapeutic and prophylactic agents, but realizing this potential requires antibodies that function across the antigenic ...Broadly neutralizing antibodies (bnAbs) against HIV hold promise as therapeutic and prophylactic agents, but realizing this potential requires antibodies that function across the antigenic heterogeneity of the HIV envelope glycoprotein (Env). Although numerous bnAbs have been isolated from infected individuals, their breadth and potency may not be sufficient to tackle global viral diversity, motivating efforts to further improve their neutralization capacity. Here, we address this challenge using a multistate antibody engineering approach integrating deep mutational scanning with combinatorial library screening across diverse Env variants. This strategy enables identification of mutation patterns that confer improved binding across antigenically distinct targets. Starting from one of the best-in-class CD4-binding site bnAbs, we performed iterative optimization to increase binding affinity across diverse Env variants. The resulting lead candidate exhibited improved breadth and up to 100-fold higher potency against pseudoviruses from large cross-clade historical and contemporary panels while maintaining biophysical and pharmacokinetic profiles conducive to clinical development. Structural and molecular dynamics analyses revealed a unique tri-tyrosine aromatic triad and reinforced electrostatic contacts that stabilized the bnAb/Env interface. These findings demonstrate that systematic engineering can generate bnAbs with enhanced breadth and potency, providing a generalizable strategy for developing therapeutic antibodies against highly diverse pathogens.
History
DepositionJun 19, 2025Deposition site: RCSB / Processing site: RCSB
Revision 1.0Apr 29, 2026Provider: repository / Type: Initial release
Revision 1.0Apr 29, 2026Data content type: EM metadata / Data content type: EM metadata / Provider: repository / Type: Initial release
Revision 1.0Apr 29, 2026Data content type: FSC / Data content type: FSC / Provider: repository / Type: Initial release
Revision 1.0Apr 29, 2026Data content type: Half map / Part number: 1 / Data content type: Half map / Provider: repository / Type: Initial release
Revision 1.0Apr 29, 2026Data content type: Half map / Part number: 2 / Data content type: Half map / Provider: repository / Type: Initial release
Revision 1.0Apr 29, 2026Data content type: Image / Data content type: Image / Provider: repository / Type: Initial release
Revision 1.0Apr 29, 2026Data content type: Mask / Part number: 1 / Data content type: Mask / Provider: repository / Type: Initial release
Revision 1.0Apr 29, 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
A: Envelope glycoprotein gp120
B: Envelope glycoprotein gp41
G: RM20A3 heavy chain
I: RM20A3 light chain
H: eN49P7-FRv1-23 heavy chain
L: eN49P7-FRv1-23 light chain
C: Envelope glycoprotein gp120
D: Envelope glycoprotein gp41
J: RM20A3 heavy chain
M: RM20A3 light chain
K: eN49P7-FRv1-23 heavy chain
N: eN49P7-FRv1-23 light chain
E: Envelope glycoprotein gp120
F: Envelope glycoprotein gp41
O: RM20A3 heavy chain
Q: RM20A3 light chain
P: eN49P7-FRv1-23 heavy chain
R: eN49P7-FRv1-23 light chain
hetero molecules


Theoretical massNumber of molelcules
Total (without water)382,68766
Polymers367,68518
Non-polymers15,00248
Water00
1


  • Idetical with deposited unit
  • defined by author&software
  • Evidence: electron microscopy, not applicable
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1

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Components

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Envelope glycoprotein ... , 2 types, 6 molecules ACEBDF

#1: Protein Envelope glycoprotein gp120 / BG505 MD39 SOSIP gp120


Mass: 54088.289 Da / Num. of mol.: 3
Mutation: T105E, M270I, F287L, R303V, A316Y, T330N, N361Q, A498C, E506R, K507R, A509R, V510R
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Human immunodeficiency virus 1 / Gene: env / Production host: Homo sapiens (human) / References: UniProt: Q2N0S5
#2: Protein Envelope glycoprotein gp41 / BG505 MD39 SOSIP gp41


Mass: 17134.324 Da / Num. of mol.: 3 / Mutation: F516S, I556P, S558P, L565D, V567H, R582H, T602C
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Human immunodeficiency virus 1 / Gene: env / Production host: Homo sapiens (human) / References: UniProt: Q2N0S6

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EN49P7-FRv1-23 ... , 2 types, 6 molecules HKPLNR

#5: Protein eN49P7-FRv1-23 heavy chain


Mass: 15432.193 Da / Num. of mol.: 3
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Production host: Homo sapiens (human)
#6: Protein eN49P7-FRv1-23 light chain


Mass: 10855.144 Da / Num. of mol.: 3
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Production host: Homo sapiens (human)

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Antibody , 2 types, 6 molecules GJOIMQ

#3: Antibody RM20A3 heavy chain


Mass: 13511.111 Da / Num. of mol.: 3
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Macaca mulatta (Rhesus monkey) / Production host: Homo sapiens (human)
#4: Antibody RM20A3 light chain


Mass: 11540.614 Da / Num. of mol.: 3
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Macaca mulatta (Rhesus monkey) / Production host: Homo sapiens (human)

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Sugars , 4 types, 48 molecules

#7: Polysaccharide alpha-D-mannopyranose-(1-3)-[alpha-D-mannopyranose-(1-6)]beta-D-mannopyranose-(1-4)-2-acetamido-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: 910.823 Da / Num. of mol.: 3
Source method: isolated from a genetically manipulated source
DescriptorTypeProgram
DManpa1-3[DManpa1-6]DManpb1-4DGlcpNAcb1-4DGlcpNAcb1-ROHGlycam Condensed SequenceGMML 1.0
WURCS=2.0/3,5,4/[a2122h-1b_1-5_2*NCC/3=O][a1122h-1b_1-5][a1122h-1a_1-5]/1-1-2-3-3/a4-b1_b4-c1_c3-d1_c6-e1WURCSPDB2Glycan 1.1.0
[][D-1-deoxy-GlcpNAc]{[(4+1)][b-D-GlcpNAc]{[(4+1)][b-D-Manp]{[(3+1)][a-D-Manp]{}[(6+1)][a-D-Manp]{}}}}LINUCSPDB-CARE
#8: 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.: 6
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
#9: 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
#10: 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.: 36 / Source method: obtained synthetically / 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

ComponentName: eN49P7-FRv1-23 Fab in complex with BG505 MD39 SOSIP and RM20A3 Fab
Type: COMPLEX / Entity ID: #1-#6 / Source: MULTIPLE SOURCES
Source (natural)Organism: Human immunodeficiency virus 1
Source (recombinant)Organism: Homo sapiens (human)
Buffer solutionpH: 5.9
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportGrid material: GOLD / Grid mesh size: 300 divisions/in. / Grid type: UltrAuFoil R1.2/1.3
VitrificationInstrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 277 K

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Electron microscopy imaging

MicroscopyModel: TFS GLACIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 200 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Nominal magnification: 190000 X / Nominal defocus max: 1800 nm / Nominal defocus min: 700 nm / C2 aperture diameter: 20 µm
Specimen holderSpecimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER
Image recordingElectron dose: 45 e/Å2 / Film or detector model: TFS FALCON 4i (4k x 4k)

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Processing

EM software
IDNameVersionCategory
1cryoSPARCparticle selection
2PHENIX1.21.1_5286model refinement
3EPUimage acquisition
5cryoSPARCCTF correction
13cryoSPARC3D reconstruction
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
SymmetryPoint symmetry: C3 (3 fold cyclic)
3D reconstructionResolution: 2.7 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 212503 / Symmetry type: POINT
RefinementHighest resolution: 2.7 Å
Stereochemistry target values: REAL-SPACE (WEIGHTED MAP SUM AT ATOM CENTERS)
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.00525218
ELECTRON MICROSCOPYf_angle_d0.8634227
ELECTRON MICROSCOPYf_dihedral_angle_d15.96510116
ELECTRON MICROSCOPYf_chiral_restr0.0543972
ELECTRON MICROSCOPYf_plane_restr0.0264290

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