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- PDB-8ek1: Cryo-EM structure of a potent anti-malarial antibody L9 in comple... -

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Basic information

Entry
Database: PDB / ID: 8ek1
TitleCryo-EM structure of a potent anti-malarial antibody L9 in complex with Plasmodium falciparum circumsporozoite protein (PfCSP)(dominant class)
Components
  • Circumsporozoite protein
  • L9 Fab heavy chain
  • L9 Fab light chain
KeywordsIMMUNE SYSTEM / Anti-Malarial / PfCSP
Function / homology
Function and homology information


host cell surface binding / symbiont entry into host / entry into host cell by a symbiont-containing vacuole / heparan sulfate proteoglycan binding / side of membrane / cell surface / plasma membrane / cytoplasm
Similarity search - Function
: / Plasmodium circumsporozoite protein / Thrombospondin type 1 domain / Thrombospondin type-1 (TSP1) repeat superfamily / Thrombospondin type-1 (TSP1) repeat profile. / Thrombospondin type 1 repeats / Thrombospondin type-1 (TSP1) repeat
Similarity search - Domain/homology
Circumsporozoite protein
Similarity search - Component
Biological speciesHomo sapiens (human)
Plasmodium falciparum 3D7 (eukaryote)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.6 Å
AuthorsTripathi, P. / Kwong, P.D.
Funding support United States, 1items
OrganizationGrant numberCountry
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID) United States
CitationJournal: Structure / Year: 2023
Title: Cryo-EM structures of anti-malarial antibody L9 with circumsporozoite protein reveal trimeric L9 association and complete 27-residue epitope.
Authors: Prabhanshu Tripathi / Michael F Bender / Haotian Lei / Lais Da Silva Pereira / Chen-Hsiang Shen / Brian Bonilla / Marlon Dillon / Li Ou / Marie Pancera / Lawrence T Wang / Baoshan Zhang / ...Authors: Prabhanshu Tripathi / Michael F Bender / Haotian Lei / Lais Da Silva Pereira / Chen-Hsiang Shen / Brian Bonilla / Marlon Dillon / Li Ou / Marie Pancera / Lawrence T Wang / Baoshan Zhang / Facundo D Batista / Azza H Idris / Robert A Seder / Peter D Kwong /
Abstract: Monoclonal antibody L9 recognizes the Plasmodium falciparum circumsporozoite protein (PfCSP) and is highly protective following controlled human malaria challenge. To gain insight into its function, ...Monoclonal antibody L9 recognizes the Plasmodium falciparum circumsporozoite protein (PfCSP) and is highly protective following controlled human malaria challenge. To gain insight into its function, we determined cryoelectron microscopy (cryo-EM) structures of L9 in complex with full-length PfCSP and assessed how this recognition influenced protection by wild-type and mutant L9s. Cryo-EM reconstructions at 3.6- and 3.7-Å resolution revealed L9 to recognize PfCSP as an atypical trimer. Each of the three L9s in the trimer directly recognized an Asn-Pro-Asn-Val (NPNV) tetrapeptide on PfCSP and interacted homotypically to facilitate L9-trimer assembly. We analyzed peptides containing different repeat tetrapeptides for binding to wild-type and mutant L9s to delineate epitope and homotypic components of L9 recognition; we found both components necessary for potent malaria protection. Last, we found the 27-residue stretch recognized by L9 to be highly conserved in P. falciparum isolates, suggesting the newly revealed complete L9 epitope to be an attractive vaccine target.
History
DepositionSep 19, 2022Deposition site: RCSB / Processing site: RCSB
Revision 1.0Mar 15, 2023Provider: repository / Type: Initial release
Revision 1.1Sep 27, 2023Group: Data collection / Database references
Category: chem_comp_atom / chem_comp_bond ...chem_comp_atom / chem_comp_bond / citation / citation_author
Item: _citation.country / _citation.journal_abbrev ..._citation.country / _citation.journal_abbrev / _citation.journal_id_ASTM / _citation.journal_id_CSD / _citation.journal_id_ISSN / _citation.journal_volume / _citation.page_first / _citation.page_last / _citation.pdbx_database_id_DOI / _citation.pdbx_database_id_PubMed / _citation.title / _citation.year

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: L9 Fab heavy chain
B: L9 Fab light chain
C: L9 Fab heavy chain
D: L9 Fab light chain
H: L9 Fab heavy chain
L: L9 Fab light chain
P: Circumsporozoite protein


Theoretical massNumber of molelcules
Total (without water)182,0267
Polymers182,0267
Non-polymers00
Water00
1


  • Idetical with deposited unit
  • defined by author
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

#1: Antibody L9 Fab heavy chain


Mass: 24475.436 Da / Num. of mol.: 3
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Production host: Homo sapiens (human)
#2: Antibody L9 Fab light chain


Mass: 23597.254 Da / Num. of mol.: 3
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Production host: Homo sapiens (human)
#3: Protein Circumsporozoite protein / CS / PfCSP


Mass: 37807.488 Da / Num. of mol.: 1 / Mutation: C-79S, K-38S, K-37S, R-34A
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Plasmodium falciparum 3D7 (eukaryote) / Strain: isolate 3D7 / Gene: CSP, PF3D7_0304600 / Production host: Homo sapiens (human) / References: UniProt: Q7K740

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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: PfCSP in complex with antibody L9 / Type: COMPLEX / Entity ID: all / Source: MULTIPLE SOURCES
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Homo sapiens (human)
Buffer solutionpH: 7.4
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportGrid type: C-flat-1.2/1.3
VitrificationInstrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE

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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: 45000 X / Nominal defocus max: 1500 nm / Nominal defocus min: 300 nm / Cs: 2.7 mm
Specimen holderCryogen: NITROGEN
Image recordingElectron dose: 63.7 e/Å2 / Film or detector model: GATAN K3 (6k x 4k)

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Processing

SoftwareName: PHENIX / Version: 1.20_4459: / Classification: refinement
EM softwareName: cryoSPARC / Version: 3.3.1 / Category: CTF correction
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 3.6 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 2964341 / Num. of class averages: 3 / Symmetry type: POINT
Atomic model buildingB value: 147.9 / Protocol: AB INITIO MODEL / Space: REAL
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.0048726
ELECTRON MICROSCOPYf_angle_d0.67311861
ELECTRON MICROSCOPYf_dihedral_angle_d5.2761195
ELECTRON MICROSCOPYf_chiral_restr0.0441305
ELECTRON MICROSCOPYf_plane_restr0.0061523

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