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- PDB-9mr2: SARS-CoV-2 S2 monomer in complex with NICA01A-1401 Fab -

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Basic information

Entry
Database: PDB / ID: 9mr2
TitleSARS-CoV-2 S2 monomer in complex with NICA01A-1401 Fab
Components
  • NICA01A-1401 Fab Heavy chain
  • NICA01A-1401 Fab Light chain
  • Spike protein S2
KeywordsVIRUS / SARS-CoV-2 / Spike / S2 / COVID / monoclonal antibody / complex / Viral protein / Viral protein-immune system complex
Function / homology
Function and homology information


symbiont-mediated disruption of host tissue / Maturation of spike protein / Translation of Structural Proteins / Virion Assembly and Release / host cell surface / host extracellular space / viral translation / symbiont-mediated-mediated suppression of host tetherin activity / Induction of Cell-Cell Fusion / structural constituent of virion ...symbiont-mediated disruption of host tissue / Maturation of spike protein / Translation of Structural Proteins / Virion Assembly and Release / host cell surface / host extracellular space / viral translation / symbiont-mediated-mediated suppression of host tetherin activity / Induction of Cell-Cell Fusion / structural constituent of virion / membrane fusion / entry receptor-mediated virion attachment to host cell / Attachment and Entry / host cell endoplasmic reticulum-Golgi intermediate compartment membrane / positive regulation of viral entry into host cell / receptor-mediated virion attachment to host cell / host cell surface receptor binding / symbiont-mediated suppression of host innate immune response / receptor ligand activity / endocytosis involved in viral entry into host cell / 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 / SARS-CoV-2 activates/modulates innate and adaptive immune responses / host cell plasma membrane / virion membrane / identical protein binding / membrane / 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 / 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. / Betacoronavirus spike (S) glycoprotein S1 subunit C-terminal (CTD) domain profile. / Spike (S) protein S1 subunit, receptor-binding domain, betacoronavirus ...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. / 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 S1, N-terminal domain, betacoronavirus-like / Betacoronavirus-like spike glycoprotein S1, N-terminal / 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
Biological speciesHomo sapiens (human)
Severe acute respiratory syndrome coronavirus 2
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.79 Å
AuthorsPark, S. / Bangaru, B. / Ward, A.B.
Funding support United States, 1items
OrganizationGrant numberCountry
Bill & Melinda Gates FoundationINV-004923 United States
CitationJournal: J Exp Med / Year: 2025
Title: Common cold embecovirus imprinting primes broadly neutralizing antibody responses to SARS-CoV-2 S2.
Authors: Siriruk Changrob / Atsuhiro Yasuhara / Suncheol Park / Sandhya Bangaru / Lei Li / Chloe A Troxell / Peter J Halfmann / Steven A Erickson / Nicholas J Catanzaro / Meng Yuan / Panpan Zhou / ...Authors: Siriruk Changrob / Atsuhiro Yasuhara / Suncheol Park / Sandhya Bangaru / Lei Li / Chloe A Troxell / Peter J Halfmann / Steven A Erickson / Nicholas J Catanzaro / Meng Yuan / Panpan Zhou / Min Huang / G Dewey Wilbanks / Joshua J C McGrath / Gagandeep Singh / Sean A Nelson / Yanbin Fu / Nai-Ying Zheng / Sofia M Carayannopoulos / Haley L Dugan / Dustin G Shaw / Christopher T Stamper / Maria Lucia L Madariaga / Florian Krammer / Raiees Andrabi / Dennis R Burton / Andrew B Ward / Ian A Wilson / Yoshihiro Kawaoka / Patrick C Wilson /
Abstract: The S2 subunit of the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) spike is highly conserved across coronavirus strains and therefore is a potential pan-coronavirus vaccine target. ...The S2 subunit of the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) spike is highly conserved across coronavirus strains and therefore is a potential pan-coronavirus vaccine target. However, antibodies targeting this region are typically non-neutralizing. We report herein that S2-targeting antibodies from patients who recovered from SARS-CoV-2 infection bound only closely related sarbecovirus subgenus strains and, like most known S2 antibodies, none of these were neutralizing. In contrast, first-exposure, severe acutely infected COVID-19 patients predominantly induced back-boosted antibody-secreting cells imprinted against past common cold coronavirus strain OC43 that were cross-reactive to as many as five subgenera of betacoronavirus strains and gave rise to antibodies that were neutralizing and protective. The antibodies targeted two different sites: one defined by competition with stem helix antibodies, and the second to an underdescribed epitope at the apex of S2. These findings suggest that S2-targeted vaccines could strategically exploit controlled OC43 priming followed by SARS-CoV-2 boosting to enhance the breadth and quality of protective antibody responses.
History
DepositionJan 6, 2025Deposition site: RCSB / Processing site: RCSB
Revision 1.0Nov 26, 2025Provider: repository / Type: Initial release

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

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Assembly

Deposited unit
A: NICA01A-1401 Fab Heavy chain
B: NICA01A-1401 Fab Light chain
C: Spike protein S2


Theoretical massNumber of molelcules
Total (without water)77,1453
Polymers77,1453
Non-polymers00
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

#1: Antibody NICA01A-1401 Fab Heavy chain


Mass: 13621.221 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Cell line (production host): HEK293F / Production host: Homo sapiens (human)
#2: Antibody NICA01A-1401 Fab Light chain


Mass: 11453.561 Da / Num. of mol.: 1
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: Protein Spike protein S2


Mass: 52069.832 Da / Num. of mol.: 1
Mutation: F817P, G880C, F888C, A892P, A899P, A942P, T912P, K986P, V987P, T1117C, D1139C
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Severe acute respiratory syndrome coronavirus 2
Gene: S, 2 / Cell line (production host): HEK293F / Production host: Homo sapiens (human) / References: UniProt: P0DTC2
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: Structure of SARS-CoV-2 S2 monomer in complex with NICA01A-1401 Fab
Type: COMPLEX / Entity ID: all / Source: RECOMBINANT
Molecular weightExperimental value: NO
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Homo sapiens (human)
Buffer solutionpH: 8
Buffer component
IDConc.NameFormulaBuffer-ID
120 mMTrisTris1
2150 mMSodium ChlorideNaCl1
SpecimenConc.: 1 mg/ml / Embedding 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: 800 nm / Cs: 2.7 mm / Alignment procedure: COMA FREE
Specimen holderCryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER
Image recordingElectron dose: 45 e/Å2 / Film or detector model: FEI FALCON IV (4k x 4k)

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Processing

EM software
IDNameCategory
1cryoSPARCparticle selection
2EPUimage acquisition
4cryoSPARCCTF correction
7Cootmodel fitting
9PHENIXmodel refinement
10Rosettamodel refinement
11cryoSPARCinitial Euler assignment
12cryoSPARCfinal Euler assignment
13cryoSPARCclassification
14cryoSPARC3D reconstruction
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
SymmetryPoint symmetry: C1 (asymmetric)
3D reconstructionResolution: 3.79 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 115033 / Symmetry type: POINT
Atomic model buildingSpace: REAL
Atomic model buildingPDB-ID: 6XR8

6xr8


Accession code: 6XR8 / Source name: PDB / Type: experimental model
RefinementCross valid method: NONE
Stereochemistry target values: GeoStd + Monomer Library + CDL v1.2
Displacement parametersBiso mean: 51.68 Å2
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.00513157
ELECTRON MICROSCOPYf_angle_d1.02054284
ELECTRON MICROSCOPYf_chiral_restr0.0544495
ELECTRON MICROSCOPYf_plane_restr0.0076550
ELECTRON MICROSCOPYf_dihedral_angle_d5.5819435

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