4QYO

Crystal Structure of anti-MSP2 Fv fragment (mAb6D8)in complex with MSP2 14-22


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.21 Å
  • R-Value Free: 0.170 
  • R-Value Work: 0.151 
  • R-Value Observed: 0.152 

wwPDB Validation 3D Report Full Report



Literature

Structural basis for epitope masking and strain specificity of a conserved epitope in an intrinsically disordered malaria vaccine candidate.

Morales, R.A.MacRaild, C.A.Seow, J.Krishnarjuna, B.Drinkwater, N.Rouet, R.Anders, R.F.Christ, D.McGowan, S.Norton, R.S.

(2015) Sci Rep 5: 10103-10103

  • DOI: 10.1038/srep10103
  • Structures With Same Primary Citation

  • PubMed Abstract: 
  • Merozoite surface protein 2 (MSP2) is an intrinsically disordered, membrane-anchored antigen of the malaria parasite Plasmodium falciparum. MSP2 can elicit a protective, albeit strain-specific, antibody response in humans. Antibodies are generated to ...

    Merozoite surface protein 2 (MSP2) is an intrinsically disordered, membrane-anchored antigen of the malaria parasite Plasmodium falciparum. MSP2 can elicit a protective, albeit strain-specific, antibody response in humans. Antibodies are generated to the conserved N- and C-terminal regions but many of these react poorly with the native antigen on the parasite surface. Here we demonstrate that recognition of a conserved N-terminal epitope by mAb 6D8 is incompatible with the membrane-bound conformation of that region, suggesting a mechanism by which native MSP2 escapes antibody recognition. Furthermore, crystal structures and NMR spectroscopy identify transient, strain-specific interactions between the 6D8 antibody and regions of MSP2 beyond the conserved epitope. These interactions account for the differential affinity of 6D8 for the two allelic families of MSP2, even though 6D8 binds to a fully conserved epitope. These results highlight unappreciated mechanisms that may modulate the specificity and efficacy of immune responses towards disordered antigens.


    Organizational Affiliation

    Medicinal Chemistry, Monash Institute of Pharmaceutical Sciences, Monash University, Parkville, VIC 3052, Australia.



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Fv fragment(mAb6D8) heavy chainA114Mus musculusMutation(s): 0 
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  • Reference Sequence

Find similar proteins by: Sequence  |  Structure

Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Fv fragment(mAb6D8) light chainB111Mus musculusMutation(s): 0 
Protein Feature View
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  • Reference Sequence
  • Find similar proteins by: Sequence   |   Structure
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
Merozoite surface antigen 2Q11Plasmodium falciparum K1Mutation(s): 2 
Gene Names: MSA2
Find proteins for Q03643 (Plasmodium falciparum (isolate K1 / Thailand))
Explore Q03643 
Go to UniProtKB:  Q03643
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.21 Å
  • R-Value Free: 0.170 
  • R-Value Work: 0.151 
  • R-Value Observed: 0.152 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 41.941α = 90
b = 60.712β = 106.68
c = 43.703γ = 90
Software Package:
Software NamePurpose
Blu-Icedata collection
PHASERphasing
PHENIXrefinement
MOSFLMdata reduction
SCALAdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2015-06-03
    Type: Initial release