5UR8

Human antibody fragment (Fab) to meningococcal Factor H binding protein

  • Classification: IMMUNE SYSTEM
  • Organism(s): Homo sapiens
  • Expression System: Escherichia coli BL21(DE3)
  • Mutation(s): No 

  • Deposited: 2017-02-09 Released: 2018-02-14 
  • Deposition Author(s): Beernink, P.T.
  • Funding Organization(s): National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.76 Å
  • R-Value Free: 0.222 
  • R-Value Work: 0.198 
  • R-Value Observed: 0.199 

Starting Model: experimental
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wwPDB Validation   3D Report Full Report


This is version 1.4 of the entry. See complete history


Literature

Crystal structure reveals vaccine elicited bactericidal human antibody targeting a conserved epitope on meningococcal fHbp.

Lopez-Sagaseta, J.Beernink, P.T.Bianchi, F.Santini, L.Frigimelica, E.Lucas, A.H.Pizza, M.Bottomley, M.J.

(2018) Nat Commun 9: 528-528

  • DOI: https://doi.org/10.1038/s41467-018-02827-7
  • Primary Citation of Related Structures:  
    5O14, 5UR8

  • PubMed Abstract: 

    Data obtained recently in the United Kingdom following a nationwide infant immunization program against serogroup B Neisseria meningitidis (MenB) reported >80% 4CMenB vaccine-mediated protection. Factor H-binding protein (fHbp) is a meningococcal virulence factor and a component of two new MenB vaccines. Here, we investigated the structural bases underlying the fHbp-dependent protective antibody response in humans, which might inform future antigen design efforts. We present the co-crystal structure of a human antibody Fab targeting fHbp. The vaccine-elicited Fab 1A12 is cross-reactive and targets an epitope highly conserved across the repertoire of three naturally occurring fHbp variants. The free Fab structure highlights conformational rearrangements occurring upon antigen binding. Importantly, 1A12 is bactericidal against MenB strains expressing fHbp from all three variants. Our results reveal important immunological features potentially contributing to the broad protection conferred by fHbp vaccination. Our studies fuel the rationale of presenting conserved protein epitopes when developing broadly protective vaccines.


  • Organizational Affiliation

    GSK Vaccines srl, Via Fiorentina 1, 53100, Siena, Italy. jlopez.sagaseta@gmail.com.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
human immunoglobulin gamma, heavy chain Fd fragment235Homo sapiensMutation(s): 0 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Sequence Annotations
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
human immunoglobulin gamma, kappa light chain217Homo sapiensMutation(s): 0 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Sequence Annotations
Expand
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.76 Å
  • R-Value Free: 0.222 
  • R-Value Work: 0.198 
  • R-Value Observed: 0.199 
  • Space Group: P 31 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 131.9α = 90
b = 131.9β = 90
c = 90.381γ = 120
Software Package:
Software NamePurpose
PHENIXrefinement
Cootmodel building
iMOSFLMdata reduction
SCALAdata scaling
PHASERphasing

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)United StatesR01AI099125

Revision History  (Full details and data files)

  • Version 1.0: 2018-02-14
    Type: Initial release
  • Version 1.1: 2018-02-21
    Changes: Database references
  • Version 1.2: 2019-12-11
    Changes: Author supporting evidence
  • Version 1.3: 2023-10-04
    Changes: Data collection, Database references, Refinement description
  • Version 1.4: 2024-10-23
    Changes: Structure summary