8EH5

Cryo-EM structure of L9 Fab in complex with rsCSP

• PDB DOI: https://doi.org/10.2210/pdb8EH5/pdb
• EM Map EMD-28135: EMDB EMDataResource

• Classification: IMMUNE SYSTEM
• Organism(s): Plasmodium falciparum, Homo sapiens
• Expression System: Escherichia coli, Cricetulus griseus
• Mutation(s): No 


• Deposited: 2022-09-13 Released: 2023-06-28 
• Deposition Author(s): Martin, G.M., Ward, A.B.
• Funding Organization(s): National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)

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Experimental Data Snapshot

• Method: ELECTRON MICROSCOPY
• Resolution: 3.36 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

Literature

Structural basis of epitope selectivity and potent protection from malaria by PfCSP antibody L9.

Martin, G.M., Fernandez-Quintero, M.L., Lee, W.H., Pholcharee, T., Eshun-Wilson, L., Liedl, K.R., Pancera, M., Seder, R.A., Wilson, I.A., Ward, A.B.

(2023) Nat Commun 14: 2815-2815

• PubMed: 37198165 
• DOI: https://doi.org/10.1038/s41467-023-38509-2
• Primary Citation of Related Structures:  
  8EH5


• PubMed Abstract: 
  

  A primary objective in malaria vaccine design is the generation of high-quality antibody responses against the circumsporozoite protein of the malaria parasite, Plasmodium falciparum (PfCSP). To enable rational antigen design, we solved a cryo-EM structure of the highly potent anti-PfCSP antibody L9 in complex with recombinant PfCSP. We found that L9 Fab binds multivalently to the minor (NPNV) repeat domain, which is stabilized by a unique set of affinity-matured homotypic, antibody-antibody contacts. Molecular dynamics simulations revealed a critical role of the L9 light chain in integrity of the homotypic interface, which likely impacts PfCSP affinity and protective efficacy. These findings reveal the molecular mechanism of the unique NPNV selectivity of L9 and emphasize the importance of anti-homotypic affinity maturation in protective immunity against P. falciparum.

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Organizational Affiliation: 

Department of Integrative Structural and Computational Biology, The Scripps Research Institute, La Jolla, CA, 92037, USA.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 7-mer - A3B3C1 Pseudo Symmetry: Asymmetric - C1 
Pseudo Stoichiometry: Hetero 7-mer - A6B1 Local Symmetry: Helical - H  (Explore in 3D)
Local Stoichiometry: Homo 3-mer - B3 

Local Symmetry: Helical - H  (Explore in 3D)
Local Stoichiometry: Homo 3-mer - B3 

Biological assembly 1 assigned by authors.

Biological Assembly Evidence: electron microscopy

Macromolecule Content

• Total Structure Weight: 174.58 kDa 
• Atom Count: 5,503 
• Modelled Residue Count: 704 
• Deposited Residue Count: 1,602 
• Unique protein chains: 3

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Circumsporozoite protein	A [auth G]	279	Plasmodium falciparum	Mutation(s): 0  Gene Names: CS
UniProt
Find proteins for Q7K740 (Plasmodium falciparum (isolate 3D7)) Explore Q7K740  Go to UniProtKB:  Q7K740

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
L9 Heavy chain	B [auth H], D [auth M], F [auth O]	227	Homo sapiens	Mutation(s): 0

Entity ID: 3
Molecule	Chains	Sequence Length	Organism	Details	Image
L9 Light chain	C [auth L], E [auth N], G [auth P]	214	Homo sapiens	Mutation(s): 0

Experimental Data & Validation

Experimental Data

• Method: ELECTRON MICROSCOPY
• Resolution: 3.36 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

Structure Validation

Entry History & Funding Information

Deposition Data

• Released Date: 2023-06-28 
Deposition Author(s): Martin, G.M., Ward, A.B.

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Funding Organization	Location	Grant Number
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)	United States	--

Revision History  

• Version 1.0: 2023-06-28
  Type: Initial release