7V05

Complex of Plasmodium falciparum circumsporozoite protein with 850 Fab


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.40 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

High-density binding to Plasmodium falciparum circumsporozoite protein repeats by inhibitory antibody elicited in mouse with human immunoglobulin repertoire.

Kucharska, I.Binter, S.Murugan, R.Scally, S.W.Ludwig, J.Prieto, K.Thai, E.Costa, G.Li, K.Horn, G.Q.Flores-Garcia, Y.Bosch, A.Sicard, T.Rubinstein, J.L.Zavala, F.Dennison, S.M.Tomaras, G.D.Levashina, E.A.Kellam, P.Wardemann, H.Julien, J.P.

(2022) PLoS Pathog 18: e1010999-e1010999

  • DOI: https://doi.org/10.1371/journal.ppat.1010999

  • PubMed Abstract: 

    Antibodies targeting the human malaria parasite Plasmodium falciparum circumsporozoite protein (PfCSP) can prevent infection and disease. PfCSP contains multiple central repeating NANP motifs; some of the most potent anti-infective antibodies against malaria bind to these repeats. Multiple antibodies can bind the repeating epitopes concurrently by engaging into homotypic Fab-Fab interactions, which results in the ordering of the otherwise largely disordered central repeat into a spiral. Here, we characterize IGHV3-33/IGKV1-5-encoded monoclonal antibody (mAb) 850 elicited by immunization of transgenic mice with human immunoglobulin loci. mAb 850 binds repeating NANP motifs with picomolar affinity, potently inhibits Plasmodium falciparum (Pf) in vitro and, when passively administered in a mouse challenge model, reduces liver burden to a similar extent as some of the most potent anti-PfCSP mAbs yet described. Like other IGHV3-33/IGKV1-5-encoded anti-NANP antibodies, mAb 850 primarily utilizes its HCDR3 and germline-encoded aromatic residues to recognize its core NANP motif. Biophysical and cryo-electron microscopy analyses reveal that up to 19 copies of Fab 850 can bind the PfCSP repeat simultaneously, and extensive homotypic interactions are observed between densely-packed PfCSP-bound Fabs to indirectly improve affinity to the antigen. Together, our study expands on the molecular understanding of repeat-induced homotypic interactions in the B cell response against PfCSP for potently protective mAbs against Pf infection.


  • Organizational Affiliation

    Program in Molecular Medicine, The Hospital for Sick Children Research Institute, Toronto, Canada.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
850 Fab Heavy Chain226Mus musculusMutation(s): 0 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Sequence Annotations
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  • Reference Sequence
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
850 Fab Light Chain213Mus musculusMutation(s): 0 
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Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
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  • Reference Sequence
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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
Circumsporozoite proteinQ [auth X]372Plasmodium falciparumMutation(s): 0 
Gene Names: CSPPF3D7_0304600
UniProt
Find proteins for Q7K740 (Plasmodium falciparum (isolate 3D7))
Explore Q7K740 
Go to UniProtKB:  Q7K740
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ7K740
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.40 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 
EM Software:
TaskSoftware PackageVersion
RECONSTRUCTIONcryoSPARC2
MODEL REFINEMENTPHENIX1.19.2

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Ontario Early Researcher AwardsCanada--
Canada Foundation for InnovationCanada--
Ontario Research FundCanada--
Canada Research ChairsCanada--
Bill & Melinda Gates FoundationUnited StatesINV-008866
CIFAR Azrieli Global ScholarsCanada--

Revision History  (Full details and data files)

  • Version 1.0: 2022-11-23
    Type: Initial release
  • Version 1.1: 2022-12-14
    Changes: Database references