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- PDB-8wqw: Cryo-EM structure of bsAb3 Fab-Gn-Gc complex -

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Basic information

Entry
Database: PDB / ID: 8wqw
TitleCryo-EM structure of bsAb3 Fab-Gn-Gc complex
Components
  • (Glycoprotein ...) x 2
  • bsAb3 Fab-heavy chain
  • bsAb3 Fab-light chain
KeywordsPROTEIN BINDING / Complex / VIRAL PROTEIN
Function / homology
Function and homology information


host cell Golgi membrane / entry receptor-mediated virion attachment to host cell / host cell endoplasmic reticulum membrane / symbiont entry into host cell / fusion of virus membrane with host endosome membrane / virion membrane / membrane
Similarity search - Function
Phlebovirus glycoprotein G1 / Phlebovirus glycoprotein G1 / Phlebovirus glycoprotein G2, fusion domain / Phlebovirus glycoprotein G2, C-terminal domain / Phlebovirus glycoprotein G2 fusion domain / Phlebovirus glycoprotein G2 C-terminal domain
Similarity search - Domain/homology
Envelopment polyprotein
Similarity search - Component
Biological speciesDabie bandavirus
Homo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.27 Å
AuthorsWu, Y. / Sun, J.Q.
Funding support China, 2items
OrganizationGrant numberCountry
National Natural Science Foundation of China (NSFC)32090014 China
National Natural Science Foundation of China (NSFC)82022042 China
CitationJournal: Proc Natl Acad Sci U S A / Year: 2024
Title: Bispecific antibodies targeting two glycoproteins on SFTSV exhibit synergistic neutralization and protection in a mouse model.
Authors: Zhen Chang / Dan Gao / Liying Liao / Junqing Sun / Gen Zhang / Xue Zhang / Feiran Wang / Chunrui Li / Babayemi Olawale Oladejo / Shihua Li / Yan Chai / Yongfei Hu / Xuancheng Lu / Haixia ...Authors: Zhen Chang / Dan Gao / Liying Liao / Junqing Sun / Gen Zhang / Xue Zhang / Feiran Wang / Chunrui Li / Babayemi Olawale Oladejo / Shihua Li / Yan Chai / Yongfei Hu / Xuancheng Lu / Haixia Xiao / Jianxun Qi / Zhihai Chen / Feng Gao / Yan Wu /
Abstract: Severe fever with thrombocytopenia syndrome (SFTS) is an emerging infectious disease with a high fatality rate of up to 30% caused by SFTS virus (SFTSV). However, no specific vaccine or antiviral ...Severe fever with thrombocytopenia syndrome (SFTS) is an emerging infectious disease with a high fatality rate of up to 30% caused by SFTS virus (SFTSV). However, no specific vaccine or antiviral therapy has been approved for clinical use. To develop an effective treatment, we isolated a panel of human monoclonal antibodies (mAbs). SF5 and SF83 are two neutralizing mAbs that recognize two viral glycoproteins (Gn and Gc), respectively. We found that their epitopes are closely located, and we then engineered them as several bispecific antibodies (bsAbs). Neutralization and animal experiments indicated that bsAbs display more potent protective effects than the parental mAbs, and the cryoelectron microscopy structure of a bsAb3 Fab-Gn-Gc complex elucidated the mechanism of protection. In vivo virus passage in the presence of antibodies indicated that two bsAbs resulted in less selective pressure and could efficiently bind to all single parental mAb-escape mutants. Furthermore, epitope analysis of the protective mAbs against SFTSV and RVFV indicated that they are all located on the Gn subdomain I, where may be the hot spots in the phleboviruses. Collectively, these data provide potential therapeutic agents and molecular basis for the rational design of vaccines against SFTSV infection.
History
DepositionOct 12, 2023Deposition site: PDBJ / Processing site: PDBJ
Revision 1.0Jun 12, 2024Provider: repository / Type: Initial release
Revision 1.1Oct 30, 2024Group: Data collection / Structure summary
Category: em_admin / pdbx_entry_details / pdbx_modification_feature
Item: _em_admin.last_update / _pdbx_entry_details.has_protein_modification

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: Glycoprotein C
B: bsAb3 Fab-heavy chain
C: bsAb3 Fab-light chain
D: Glycoprotein N
E: bsAb3 Fab-light chain
F: bsAb3 Fab-heavy chain
hetero molecules


Theoretical massNumber of molelcules
Total (without water)230,4868
Polymers229,4756
Non-polymers1,0112
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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Glycoprotein ... , 2 types, 2 molecules AD

#1: Protein Glycoprotein C / Gc / Glycoprotein G2


Mass: 47204.645 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Dabie bandavirus / Cell line (production host): HEK293F / Production host: Homo sapiens (human) / References: UniProt: R4V2Q5
#4: Protein Glycoprotein N / Gn / Glycoprotein G1


Mass: 35780.461 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Dabie bandavirus / Cell line (production host): HEK293F / Production host: Homo sapiens (human) / References: UniProt: R4V2Q5

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Antibody , 2 types, 4 molecules BFCE

#2: Antibody bsAb3 Fab-heavy chain


Mass: 37968.289 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Cell line (production host): HEK293F / Production host: Homo sapiens (human)
#3: Antibody bsAb3 Fab-light chain


Mass: 35276.727 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Cell line (production host): HEK293F / Production host: Homo sapiens (human)

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Sugars , 2 types, 2 molecules

#5: Polysaccharide alpha-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta- ...alpha-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.: 1 / Source method: obtained synthetically
DescriptorTypeProgram
DManpa1-4DGlcpNAcb1-4DGlcpNAcb1-Glycam Condensed SequenceGMML 1.0
WURCS=2.0/2,3,2/[a2122h-1b_1-5_2*NCC/3=O][a1122h-1a_1-5]/1-1-2/a4-b1_b4-c1WURCSPDB2Glycan 1.1.0
[]{[(4+1)][b-D-GlcpNAc]{[(4+1)][b-D-GlcpNAc]{[(4+1)][a-D-Manp]{}}}}LINUCSPDB-CARE
#6: 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.: 1 / Source method: obtained synthetically
DescriptorTypeProgram
DGlcpNAcb1-4DGlcpNAcb1-Glycam 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
[]{[(4+1)][b-D-GlcpNAc]{[(4+1)][b-D-GlcpNAc]{}}}LINUCSPDB-CARE

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Details

Has ligand of interestY
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
1the structure of bsAb3_Gn_Gc complexCOMPLEX#1-#40RECOMBINANT
2Gn_GcCOMPLEX#1, #41RECOMBINANT
3FabCOMPLEX#2-#31RECOMBINANT
Source (natural)
IDEntity assembly-IDOrganismNcbi tax-ID
23Homo sapiens (human)9606
12Dabie bandavirus1003835
Source (recombinant)Organism: Homo sapiens (human)
Buffer solutionpH: 8
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationCryogen name: ETHANE

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: FEI TITAN KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Nominal defocus max: 2000 nm / Nominal defocus min: 1000 nm
Image recordingElectron dose: 60 e/Å2 / Film or detector model: GATAN K3 (6k x 4k)

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Processing

CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 3.27 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 158475 / Symmetry type: POINT
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.0059176
ELECTRON MICROSCOPYf_angle_d0.67312430
ELECTRON MICROSCOPYf_dihedral_angle_d5.8151290
ELECTRON MICROSCOPYf_chiral_restr0.0481365
ELECTRON MICROSCOPYf_plane_restr0.0061594

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