4QYO

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


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.208 Å
  • R-Value Free: 0.170 
  • R-Value Work: 0.151 

wwPDB Validation 3D Report Full Report


This is version 1.0 of the entry. See complete history

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
  • Primary Citation of Related Structures:  

  • 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 chain
A
114N/AMutation(s): 0 
Protein Feature View is not available: No corresponding UniProt sequence found.
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Fv fragment(mAb6D8) light chain
B
111N/AMutation(s): 0 
Protein Feature View is not available: No corresponding UniProt sequence found.
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
Merozoite surface antigen 2
Q
11Plasmodium falciparumMutation(s): 0 
Gene Names: MSA2
Find proteins for Q03643 (Plasmodium falciparum)
Go to UniProtKB:  Q03643
Small Molecules
Modified Residues  2 Unique
IDChainsTypeFormula2D DiagramParent
NH2
Query on NH2
Q
NON-POLYMERH2 N

--

ACE
Query on ACE
Q
NON-POLYMERC2 H4 O

--

Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.208 Å
  • R-Value Free: 0.170 
  • R-Value Work: 0.151 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 41.941α = 90.00
b = 60.712β = 106.68
c = 43.703γ = 90.00
Software Package:
Software NamePurpose
Blu-Icedata collection
MOSFLMdata reduction
PHENIXrefinement
SCALAdata scaling
PHASERphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

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