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- PDB-9xi4: SARS-CoV-2 Omicron BA.4/5 spike RBD in complex with BD56-104 Fab ... -

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Basic information

Entry
Database: PDB / ID: 9xi4
TitleSARS-CoV-2 Omicron BA.4/5 spike RBD in complex with BD56-104 Fab and ACE2
Components
  • Heavy chain of BD56-104 Fab
  • Light chain of BD56-104 Fab
  • Processed angiotensin-converting enzyme 2
  • Spike protein S1
KeywordsVIRAL PROTEIN/IMMUNE SYSTEM/HYDROLASE / Spike protein / Antibody Fab fragment / Complex / VIRAL PROTEIN-IMMUNE SYSTEM-HYDROLASE complex
Function / homology
Function and homology information


positive regulation of amino acid transport / angiotensin-converting enzyme 2 / positive regulation of L-proline import across plasma membrane / Hydrolases; Acting on peptide bonds (peptidases); Metallocarboxypeptidases / angiotensin-mediated drinking behavior / positive regulation of gap junction assembly / tryptophan transport / maternal process involved in female pregnancy / regulation of systemic arterial blood pressure by renin-angiotensin / regulation of cardiac conduction ...positive regulation of amino acid transport / angiotensin-converting enzyme 2 / positive regulation of L-proline import across plasma membrane / Hydrolases; Acting on peptide bonds (peptidases); Metallocarboxypeptidases / angiotensin-mediated drinking behavior / positive regulation of gap junction assembly / tryptophan transport / maternal process involved in female pregnancy / regulation of systemic arterial blood pressure by renin-angiotensin / regulation of cardiac conduction / transporter activator activity / peptidyl-dipeptidase activity / amino acid import across plasma membrane / regulation of vasoconstriction / Metabolism of Angiotensinogen to Angiotensins / carboxypeptidase activity / angiotensin maturation / receptor-mediated endocytosis of virus by host cell / viral life cycle / Attachment and Entry / metallocarboxypeptidase activity / positive regulation of cardiac muscle contraction / regulation of cytokine production / blood vessel diameter maintenance / negative regulation of smooth muscle cell proliferation / brush border membrane / negative regulation of ERK1 and ERK2 cascade / positive regulation of reactive oxygen species metabolic process / metallopeptidase activity / endocytic vesicle membrane / cilium / regulation of cell population proliferation / regulation of inflammatory response / virus receptor activity / symbiont-mediated disruption of host tissue / Maturation of spike protein / endopeptidase activity / Translation of Structural Proteins / Virion Assembly and Release / host cell surface / Lectin pathway of complement activation / host extracellular region / symbiont-mediated-mediated suppression of host tetherin activity / Induction of Cell-Cell Fusion / structural constituent of virion / Potential therapeutics for SARS / positive regulation of viral entry into host cell / Initial triggering of complement / membrane fusion / host cell endoplasmic reticulum-Golgi intermediate compartment membrane / Attachment and Entry / entry receptor-mediated virion attachment to host cell / receptor-mediated virion attachment to host cell / apical plasma membrane / host cell surface receptor binding / symbiont-mediated suppression of host innate immune response / endocytosis involved in viral entry into host cell / membrane raft / endoplasmic reticulum lumen / receptor ligand activity / fusion of virus membrane with host plasma membrane / fusion of virus membrane with host endosome membrane / viral envelope / symbiont entry into host cell / virion attachment to host cell / host cell plasma membrane / SARS-CoV-2 activates/modulates innate and adaptive immune responses / negative regulation of transcription by RNA polymerase II / virion membrane / cell surface / : / extracellular exosome / extracellular region / zinc ion binding / membrane / identical protein binding / plasma membrane
Similarity search - Function
Collectrin domain / Renal amino acid transporter / Collectrin-like domain profile. / Peptidase M2, peptidyl-dipeptidase A / Angiotensin-converting enzyme / Peptidase family M2 domain profile. / Neutral zinc metallopeptidases, zinc-binding region signature. / Spike (S) protein S1 subunit, receptor-binding domain, SARS-CoV-2 / Spike (S) protein S1 subunit, N-terminal domain, SARS-CoV-like / Coronavirus spike glycoprotein S1, C-terminal ...Collectrin domain / Renal amino acid transporter / Collectrin-like domain profile. / Peptidase M2, peptidyl-dipeptidase A / Angiotensin-converting enzyme / Peptidase family M2 domain profile. / Neutral zinc metallopeptidases, zinc-binding region signature. / Spike (S) protein S1 subunit, receptor-binding domain, SARS-CoV-2 / Spike (S) protein S1 subunit, N-terminal domain, SARS-CoV-like / Coronavirus spike glycoprotein S1, C-terminal / Coronavirus spike glycoprotein S1, C-terminal / Spike glycoprotein, N-terminal domain superfamily / Spike S1 subunit, receptor binding domain superfamily, betacoronavirus / Spike glycoprotein, betacoronavirus / Betacoronavirus spike (S) glycoprotein S1 subunit N-terminal (NTD) domain profile. / Spike glycoprotein S1, N-terminal domain, betacoronavirus-like / Betacoronavirus-like spike glycoprotein S1, N-terminal / Betacoronavirus spike (S) glycoprotein S1 subunit C-terminal (CTD) domain profile. / Spike (S) protein S1 subunit, receptor-binding domain, betacoronavirus / Betacoronavirus spike glycoprotein S1, receptor binding / Spike glycoprotein S2 superfamily, coronavirus / Spike glycoprotein S2, coronavirus, heptad repeat 1 / Spike glycoprotein S2, coronavirus, heptad repeat 2 / Coronavirus spike (S) glycoprotein S2 subunit heptad repeat 1 (HR1) region profile. / Coronavirus spike (S) glycoprotein S2 subunit heptad repeat 2 (HR2) region profile. / Spike glycoprotein S2, coronavirus / Coronavirus spike glycoprotein S2
Similarity search - Domain/homology
Spike glycoprotein / Angiotensin-converting enzyme 2
Similarity search - Component
Biological speciesHomo sapiens (human)
Severe acute respiratory syndrome coronavirus 2
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.83 Å
AuthorsNiu, C. / Liu, B. / Gao, X. / Li, Z. / He, J. / Xiong, X.
Funding support China, 8items
OrganizationGrant numberCountry
Other government2021YFA1300903
National Natural Science Foundation of China (NSFC)82341085 China
Other governmentEKPG21-06
Other governmentSRPG22-002
Other government2021A1515011289
Other government2023B1212060050
Other government2023B1212120009
Other governmentGIBHBRP24-02
CitationJournal: To Be Published
Title: AI identifies Elite Antibodies that Tolerate Escape Mutations from a Population Antibody Class Exerting Continued Selection Over SARS-CoV-2
Authors: Niu, C. / Huang, X. / Yan, Q. / Liu, B. / Gao, X. / Song, Y. / Wang, J. / Wang, L. / Li, Z. / Zheng, H. / He, P. / Huang, X. / Yuan, H. / Zou, B. / Yang, Y. / Wu, F. / Yao, Y. / Chen, X. / ...Authors: Niu, C. / Huang, X. / Yan, Q. / Liu, B. / Gao, X. / Song, Y. / Wang, J. / Wang, L. / Li, Z. / Zheng, H. / He, P. / Huang, X. / Yuan, H. / Zou, B. / Yang, Y. / Wu, F. / Yao, Y. / Chen, X. / Chen, L. / He, J. / Yao, J. / Zhao, J. / Xiong, X.
History
DepositionNov 2, 2025Deposition site: PDBJ / Processing site: PDBC
Revision 1.0Aug 12, 2026Provider: repository / Type: Initial release
Revision 1.0Aug 12, 2026Data content type: EM metadata / Data content type: EM metadata / Provider: repository / Type: Initial release
Revision 1.0Aug 12, 2026Data content type: Half map / Part number: 1 / Data content type: Half map / Provider: repository / Type: Initial release
Revision 1.0Aug 12, 2026Data content type: Half map / Part number: 2 / Data content type: Half map / Provider: repository / Type: Initial release
Revision 1.0Aug 12, 2026Data content type: Image / Data content type: Image / Provider: repository / Type: Initial release
Revision 1.0Aug 12, 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

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Assembly

Deposited unit
A: Processed angiotensin-converting enzyme 2
E: Spike protein S1
H: Heavy chain of BD56-104 Fab
L: Light chain of BD56-104 Fab
hetero molecules


Theoretical massNumber of molelcules
Total (without water)139,4899
Polymers138,5394
Non-polymers9505
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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Protein , 2 types, 2 molecules AE

#1: Protein Processed angiotensin-converting enzyme 2


Mass: 69717.391 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: ACE2, UNQ868/PRO1885 / Production host: Homo sapiens (human) / References: UniProt: Q9BYF1
#2: Protein Spike protein S1


Mass: 22119.957 Da / Num. of mol.: 1 / Fragment: RBD
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Severe acute respiratory syndrome coronavirus 2
Gene: S, 2 / Variant: Omicron BA.5 / Production host: Homo sapiens (human) / References: UniProt: P0DTC2

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Antibody , 2 types, 2 molecules HL

#3: Antibody Heavy chain of BD56-104 Fab


Mass: 23848.598 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Production host: Homo sapiens (human)
#4: Antibody Light chain of BD56-104 Fab


Mass: 22853.215 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Production host: Homo sapiens (human)

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Non-polymers / Sugars , 2 types, 5 molecules

#5: Chemical ChemComp-ZN / ZINC ION


Mass: 65.409 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: Zn
#6: 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.: 4 / 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: SARS-CoV-2 Omicron BA.4/5 spike RBD in complex with BD56-104 Fab and ACE2
Type: COMPLEX / Entity ID: #1-#4 / Source: MULTIPLE SOURCES
Source (natural)Organism: Severe acute respiratory syndrome coronavirus 2
Source (recombinant)Organism: Homo sapiens (human)
Buffer solutionpH: 8
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationCryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 295 K

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: TFS 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: 600 nm
Image recordingElectron dose: 50 e/Å2 / Film or detector model: TFS FALCON 4i (4k x 4k)

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Processing

EM software
IDNameVersionCategory
1cryoSPARCparticle selection
9PHENIX1.19.1_4122model refinement
13cryoSPARC3D reconstruction
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 2.83 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 344337 / Symmetry type: POINT
RefinementHighest resolution: 2.83 Å
Stereochemistry target values: REAL-SPACE (WEIGHTED MAP SUM AT ATOM CENTERS)
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.0049922
ELECTRON MICROSCOPYf_angle_d0.67813505
ELECTRON MICROSCOPYf_dihedral_angle_d4.3371349
ELECTRON MICROSCOPYf_chiral_restr0.0481465
ELECTRON MICROSCOPYf_plane_restr0.0051746

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