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- PDB-7chb: Crystal structure of the SARS-CoV-2 RBD in complex with BD-236 Fab -

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Basic information

Entry
Database: PDB / ID: 7chb
TitleCrystal structure of the SARS-CoV-2 RBD in complex with BD-236 Fab
Components
  • BD-236 Fab heavy chain
  • BD-236 Fab light chain
  • Spike protein S1
KeywordsANTIVIRAL PROTEIN/IMMUNE SYSTEM / SARS-Cov-2 / RBD / mAb / ANTIVIRAL PROTEIN / ANTIVIRAL PROTEIN-IMMUNE SYSTEM complex
Function / homology
Function and homology information


Maturation of spike protein / viral translation / Translation of Structural Proteins / Virion Assembly and Release / host cell surface / host extracellular space / suppression by virus of host tetherin activity / Induction of Cell-Cell Fusion / structural constituent of virion / host cell endoplasmic reticulum-Golgi intermediate compartment membrane ...Maturation of spike protein / viral translation / Translation of Structural Proteins / Virion Assembly and Release / host cell surface / host extracellular space / suppression by virus of host tetherin activity / Induction of Cell-Cell Fusion / structural constituent of virion / host cell endoplasmic reticulum-Golgi intermediate compartment membrane / entry receptor-mediated virion attachment to host cell / receptor-mediated endocytosis of virus by host cell / Attachment and Entry / membrane fusion / positive regulation of viral entry into host cell / receptor-mediated virion attachment to host cell / receptor ligand activity / host cell surface receptor binding / fusion of virus membrane with host plasma membrane / fusion of virus membrane with host endosome membrane / viral envelope / symbiont-mediated suppression of host type I interferon-mediated signaling pathway / virion attachment to host cell / SARS-CoV-2 activates/modulates innate and adaptive immune responses / host cell plasma membrane / virion membrane / membrane / identical protein binding / plasma membrane
Similarity search - Function
Spike (S) protein S1 subunit, receptor-binding domain, SARS-CoV-2 / Spike (S) protein S1 subunit, N-terminal domain, SARS-CoV-like / Betacoronavirus spike (S) glycoprotein S1 subunit N-terminal (NTD) domain profile. / Spike glycoprotein, N-terminal domain superfamily / Betacoronavirus spike (S) glycoprotein S1 subunit C-terminal (CTD) domain profile. / Spike glycoprotein, betacoronavirus / Spike (S) protein S1 subunit, receptor-binding domain, betacoronavirus / Spike S1 subunit, receptor binding domain superfamily, betacoronavirus / Betacoronavirus spike glycoprotein S1, receptor binding / Spike glycoprotein S1, N-terminal domain, betacoronavirus-like ...Spike (S) protein S1 subunit, receptor-binding domain, SARS-CoV-2 / Spike (S) protein S1 subunit, N-terminal domain, SARS-CoV-like / Betacoronavirus spike (S) glycoprotein S1 subunit N-terminal (NTD) domain profile. / Spike glycoprotein, N-terminal domain superfamily / Betacoronavirus spike (S) glycoprotein S1 subunit C-terminal (CTD) domain profile. / Spike glycoprotein, betacoronavirus / Spike (S) protein S1 subunit, receptor-binding domain, betacoronavirus / Spike S1 subunit, receptor binding domain superfamily, betacoronavirus / Betacoronavirus spike glycoprotein S1, receptor binding / Spike glycoprotein S1, N-terminal domain, betacoronavirus-like / Betacoronavirus-like spike glycoprotein S1, N-terminal / Spike glycoprotein S2, coronavirus, heptad repeat 1 / Spike glycoprotein S2, coronavirus, heptad repeat 2 / Coronavirus spike (S) glycoprotein S2 subunit heptad repeat 2 (HR2) region profile. / Coronavirus spike (S) glycoprotein S2 subunit heptad repeat 1 (HR1) region profile. / Spike glycoprotein S2 superfamily, coronavirus / Spike glycoprotein S2, coronavirus / Coronavirus spike glycoprotein S2 / Coronavirus spike glycoprotein S1, C-terminal / Coronavirus spike glycoprotein S1, C-terminal
Similarity search - Domain/homology
Biological speciesHomo sapiens (human)
Severe acute respiratory syndrome coronavirus 2
MethodX-RAY DIFFRACTION / SYNCHROTRON / MOLECULAR REPLACEMENT / Resolution: 2.4 Å
AuthorsXiao, J. / Zhu, Q.
CitationJournal: Cell / Year: 2020
Title: Structurally Resolved SARS-CoV-2 Antibody Shows High Efficacy in Severely Infected Hamsters and Provides a Potent Cocktail Pairing Strategy.
Authors: Shuo Du / Yunlong Cao / Qinyu Zhu / Pin Yu / Feifei Qi / Guopeng Wang / Xiaoxia Du / Linlin Bao / Wei Deng / Hua Zhu / Jiangning Liu / Jianhui Nie / Yinghui Zheng / Haoyu Liang / Ruixue Liu ...Authors: Shuo Du / Yunlong Cao / Qinyu Zhu / Pin Yu / Feifei Qi / Guopeng Wang / Xiaoxia Du / Linlin Bao / Wei Deng / Hua Zhu / Jiangning Liu / Jianhui Nie / Yinghui Zheng / Haoyu Liang / Ruixue Liu / Shuran Gong / Hua Xu / Ayijiang Yisimayi / Qi Lv / Bo Wang / Runsheng He / Yunlin Han / Wenjie Zhao / Yali Bai / Yajin Qu / Xiang Gao / Chenggong Ji / Qisheng Wang / Ning Gao / Weijin Huang / Youchun Wang / X Sunney Xie / Xiao-Dong Su / Junyu Xiao / Chuan Qin /
Abstract: Understanding how potent neutralizing antibodies (NAbs) inhibit SARS-CoV-2 is critical for effective therapeutic development. We previously described BD-368-2, a SARS-CoV-2 NAb with high potency; ...Understanding how potent neutralizing antibodies (NAbs) inhibit SARS-CoV-2 is critical for effective therapeutic development. We previously described BD-368-2, a SARS-CoV-2 NAb with high potency; however, its neutralization mechanism is largely unknown. Here, we report the 3.5-Å cryo-EM structure of BD-368-2/trimeric-spike complex, revealing that BD-368-2 fully blocks ACE2 recognition by occupying all three receptor-binding domains (RBDs) simultaneously, regardless of their "up" or "down" conformations. Also, BD-368-2 treats infected adult hamsters at low dosages and at various administering windows, in contrast to placebo hamsters that manifested severe interstitial pneumonia. Moreover, BD-368-2's epitope completely avoids the common binding site of VH3-53/VH3-66 recurrent NAbs, evidenced by tripartite co-crystal structures with RBDs. Pairing BD-368-2 with a potent recurrent NAb neutralizes SARS-CoV-2 pseudovirus at pM level and rescues mutation-induced neutralization escapes. Together, our results rationalized a new RBD epitope that leads to high neutralization potency and demonstrated BD-368-2's therapeutic potential in treating COVID-19.
History
DepositionJul 5, 2020Deposition site: PDBJ / Processing site: PDBJ
Revision 1.0Sep 16, 2020Provider: repository / Type: Initial release
Revision 1.1Oct 7, 2020Group: Database references / Category: citation / citation_author
Item: _citation.journal_abbrev / _citation.journal_id_CSD ..._citation.journal_abbrev / _citation.journal_id_CSD / _citation.journal_id_ISSN / _citation.pdbx_database_id_DOI / _citation.pdbx_database_id_PubMed / _citation.title / _citation.year
Revision 1.2Nov 25, 2020Group: Database references / Structure summary / Category: audit_author / citation
Item: _audit_author.name / _citation.journal_volume ..._audit_author.name / _citation.journal_volume / _citation.page_first / _citation.page_last
Revision 1.3Mar 10, 2021Group: Structure summary / Category: entity / entity_name_com / Item: _entity.pdbx_description / _entity_name_com.name
Revision 1.4Nov 29, 2023Group: Data collection / Database references / Refinement description
Category: chem_comp_atom / chem_comp_bond ...chem_comp_atom / chem_comp_bond / database_2 / pdbx_initial_refinement_model
Item: _database_2.pdbx_DOI / _database_2.pdbx_database_accession

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
H: BD-236 Fab heavy chain
L: BD-236 Fab light chain
R: Spike protein S1
hetero molecules


Theoretical massNumber of molelcules
Total (without water)71,9814
Polymers71,5563
Non-polymers4241
Water3,405189
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: gel filtration
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1
Buried area5850 Å2
ΔGint-17 kcal/mol
Surface area27240 Å2
Unit cell
Length a, b, c (Å)195.614, 86.788, 56.415
Angle α, β, γ (deg.)90.000, 100.130, 90.000
Int Tables number5
Space group name H-MC121

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Components

#1: Antibody BD-236 Fab heavy chain


Mass: 23333.113 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Cell line (production host): 293F / Production host: Homo sapiens (human)
#2: Antibody BD-236 Fab light chain


Mass: 23100.668 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Cell line (production host): 293F / Production host: Homo sapiens (human)
#3: Protein Spike protein S1 / S glycoprotein / E2 / Peplomer protein / SARS-coV-2 Receptor Binding Domain


Mass: 25122.336 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Severe acute respiratory syndrome coronavirus 2
Gene: S, 2 / Production host: Spodoptera frugiperda (fall armyworm) / References: UniProt: P0DTC2
#4: 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: isolated from a genetically manipulated source
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
#5: Water ChemComp-HOH / water / Water


Mass: 18.015 Da / Num. of mol.: 189 / Source method: isolated from a natural source / Formula: H2O
Has ligand of interestN

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Experimental details

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Experiment

ExperimentMethod: X-RAY DIFFRACTION / Number of used crystals: 1

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Sample preparation

CrystalDensity Matthews: 3.29 Å3/Da / Density % sol: 62.66 %
Crystal growTemperature: 293 K / Method: vapor diffusion, sitting drop / Details: 0.1 M Sodium Citrate, pH 5.0, 8% (w/v) PEG 8000

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Data collection

DiffractionMean temperature: 80 K / Serial crystal experiment: N
Diffraction sourceSource: SYNCHROTRON / Site: SSRF / Beamline: BL17U1 / Wavelength: 0.97918 Å
DetectorType: DECTRIS EIGER X 16M / Detector: PIXEL / Date: Apr 16, 2020
RadiationProtocol: SINGLE WAVELENGTH / Monochromatic (M) / Laue (L): M / Scattering type: x-ray
Radiation wavelengthWavelength: 0.97918 Å / Relative weight: 1
ReflectionResolution: 2.4→50 Å / Num. obs: 36363 / % possible obs: 99.62 % / Redundancy: 6.8 % / CC1/2: 0.976 / Net I/σ(I): 15.2
Reflection shellResolution: 2.4→2.44 Å / Num. unique obs: 3591 / CC1/2: 0.798

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Processing

Software
NameVersionClassification
HKL-2000data reduction
HKL-2000data scaling
PHENIX1.18_3845refinement
PDB_EXTRACT3.25data extraction
PHENIX1.18_3845phasing
RefinementMethod to determine structure: MOLECULAR REPLACEMENT
Starting model: 6W41

6w41


Resolution: 2.4→48.14 Å / SU ML: 0.3 / Cross valid method: THROUGHOUT / σ(F): 1.38 / Phase error: 24.81 / Stereochemistry target values: ML
RfactorNum. reflection% reflection
Rfree0.2256 1814 4.99 %
Rwork0.1924 34520 -
obs0.194 36334 99.64 %
Solvent computationShrinkage radii: 0.9 Å / VDW probe radii: 1.11 Å / Solvent model: FLAT BULK SOLVENT MODEL
Displacement parametersBiso max: 112.67 Å2 / Biso mean: 50.713 Å2 / Biso min: 28.03 Å2
Refinement stepCycle: final / Resolution: 2.4→48.14 Å
ProteinNucleic acidLigandSolventTotal
Num. atoms4676 0 28 189 4893
Biso mean--91.04 50.41 -
Num. residues----614
LS refinement shell

Refine-ID: X-RAY DIFFRACTION / Rfactor Rfree error: 0 / Total num. of bins used: 13

Resolution (Å)Rfactor RfreeNum. reflection RfreeRfactor RworkNum. reflection RworkNum. reflection all% reflection obs (%)
2.4-2.460.29881390.27372667280699
2.47-2.540.29951370.24712616275399
2.54-2.620.25681380.2342630276899
2.62-2.710.26961390.24092630276999
2.71-2.820.30631400.2326612801100
2.82-2.950.28741390.229226332772100
2.95-3.110.25641390.218226552794100
3.11-3.30.26461410.221626522793100
3.3-3.550.21221390.197926692808100
3.55-3.910.24851390.188226382777100
3.91-4.480.21341420.157626712813100
4.48-5.640.15151410.146227002841100
5.64-48.140.18921410.18082698283999

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