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- PDB-8w5p: Cryo-EM structure of Qb-Ab40 -

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Basic information

Entry
Database: PDB / ID: 8w5p
TitleCryo-EM structure of Qb-Ab40
Components
  • Heavy chain of Ab40
  • Light chain of Ab40
  • Minor capsid protein A1
KeywordsIMMUNE SYSTEM / Qb / Antibody / cryo-EM
Function / homologyRead-through domain / Read-through domain / Levivirus coat protein / Levivirus coat protein / Bacteriophage RNA-type, capsid / viral capsid / structural molecule activity / Minor capsid protein A1
Function and homology information
Biological speciesMus musculus (house mouse)
Escherichia phage Qbeta (virus)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.3 Å
AuthorsBao, K.Y. / Hua, Z.L. / Hou, B.D. / Zhu, P.
Funding support China, 4items
OrganizationGrant numberCountry
National Natural Science Foundation of China (NSFC)81991495 China
National Natural Science Foundation of China (NSFC)32241029 China
Chinese Academy of SciencesXDB29050600 China
Chinese Academy of SciencesXDB37010100 China
CitationJournal: Cell Rep / Year: 2025
Title: Competition propels, rather than limits, the success of low-affinity B cells in the germinal center response.
Authors: Runhan Li / Keyan Bao / Can Liu / Xuejing Ma / Zhaolin Hua / Ping Zhu / Baidong Hou /
Abstract: The germinal center (GC) sets an environment where antigen-specific B cells are compelled to continuously increase their affinity to compete for the antigen and obtain Tfh help for survival and ...The germinal center (GC) sets an environment where antigen-specific B cells are compelled to continuously increase their affinity to compete for the antigen and obtain Tfh help for survival and propagation. Previous studies indicated that low-affinity B cells are disadvantaged in the presence of high-affinity ones, suggesting that competition may lead to the elimination of low-affinity B cells and their descendants. However, using a multivalent virus-mimicking antigen, our study demonstrates that low-affinity B cells not only successfully participate in GC responses alongside high-affinity B cells but also undergo accelerated affinity maturation under the more stringent competition. Furthermore, our cryo-electron-microscopy-based structural analysis reveals that both low-affinity and high-affinity B cells compete for the same antigenic epitope. Although the applicability of this idealized GC competition to true pathogen-induced responses remains uncertain, this change in perspective on the role of competition in low-affinity B cell evolution provides valuable insights for vaccine development.
History
DepositionAug 27, 2023Deposition site: PDBJ / Processing site: PDBJ
Revision 1.0Feb 26, 2025Provider: repository / Type: Initial release
Revision 1.0Feb 26, 2025Data content type: EM metadata / Data content type: EM metadata / Provider: repository / Type: Initial release
Revision 1.0Feb 26, 2025Data content type: Half map / Part number: 1 / Data content type: Half map / Provider: repository / Type: Initial release
Revision 1.0Feb 26, 2025Data content type: Half map / Part number: 2 / Data content type: Half map / Provider: repository / Type: Initial release
Revision 1.0Feb 26, 2025Data content type: Image / Data content type: Image / Provider: repository / Type: Initial release
Revision 1.0Feb 26, 2025Data 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
L: Light chain of Ab40
H: Heavy chain of Ab40
C: Minor capsid protein A1
c: Minor capsid protein A1


Theoretical massNumber of molelcules
Total (without water)54,4324
Polymers54,4324
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 Light chain of Ab40


Mass: 12671.184 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Mus musculus (house mouse) / Production host: Homo sapiens (human)
#2: Antibody Heavy chain of Ab40


Mass: 13224.450 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Mus musculus (house mouse) / Production host: Homo sapiens (human)
#3: Protein Minor capsid protein A1 / Qb coat protein


Mass: 14268.071 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Escherichia phage Qbeta (virus) / Production host: Escherichia coli (E. coli) / References: UniProt: Q8LTE1
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: Complex of Qb-Ab40 / Type: COMPLEX / Entity ID: all / Source: RECOMBINANT
Source (natural)Organism: Mus (mice)
Source (recombinant)Organism: Homo sapiens (human)
Buffer solutionpH: 7.4
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: Talos Arctica / Image courtesy: FEI Company
MicroscopyModel: FEI TALOS ARCTICA
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 200 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Nominal defocus max: 1600 nm / Nominal defocus min: 1200 nm
Image recordingElectron dose: 50 e/Å2 / Film or detector model: GATAN K2 SUMMIT (4k x 4k)

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Processing

EM softwareName: PHENIX / Version: 1.19.2_4158: / Category: model refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 3.3 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 530467 / Symmetry type: POINT
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.0033654
ELECTRON MICROSCOPYf_angle_d0.6184972
ELECTRON MICROSCOPYf_dihedral_angle_d4.274501
ELECTRON MICROSCOPYf_chiral_restr0.045574
ELECTRON MICROSCOPYf_plane_restr0.005641

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