5SZF

2A10 FAB fragment 2.54 Angstoms


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.52 Å
  • R-Value Free: 0.248 
  • R-Value Work: 0.225 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

T-dependent B cell responses to Plasmodium induce antibodies that form a high-avidity multivalent complex with the circumsporozoite protein.

Fisher, C.R.Sutton, H.J.Kaczmarski, J.A.McNamara, H.A.Clifton, B.Mitchell, J.Cai, Y.Dups, J.N.D'Arcy, N.J.Singh, M.Chuah, A.Peat, T.S.Jackson, C.J.Cockburn, I.A.

(2017) PLoS Pathog. 13: e1006469-e1006469

  • DOI: 10.1371/journal.ppat.1006469

  • PubMed Abstract: 
  • The repeat region of the Plasmodium falciparum circumsporozoite protein (CSP) is a major vaccine antigen because it can be targeted by parasite neutralizing antibodies; however, little is known about this interaction. We used isothermal titration cal ...

    The repeat region of the Plasmodium falciparum circumsporozoite protein (CSP) is a major vaccine antigen because it can be targeted by parasite neutralizing antibodies; however, little is known about this interaction. We used isothermal titration calorimetry, X-ray crystallography and mutagenesis-validated modeling to analyze the binding of a murine neutralizing antibody to Plasmodium falciparum CSP. Strikingly, we found that the repeat region of CSP is bound by multiple antibodies. This repeating pattern allows multiple weak interactions of single FAB domains to accumulate and yield a complex with a dissociation constant in the low nM range. Because the CSP protein can potentially cross-link multiple B cell receptors (BCRs) we hypothesized that the B cell response might be T cell independent. However, while there was a modest response in mice deficient in T cell help, the bulk of the response was T cell dependent. By sequencing the BCRs of CSP-repeat specific B cells in inbred mice we found that these cells underwent somatic hypermutation and affinity maturation indicative of a T-dependent response. Last, we found that the BCR repertoire of responding B cells was limited suggesting that the structural simplicity of the repeat may limit the breadth of the immune response.


    Organizational Affiliation

    CSIRO Biomedical Manufacturing Program, Parkville, Victoria, Australia.,Research School of Chemistry, The Australian National University, Canberra, Australian Capital Territory, Australia.,John Curtin School of Medical Research, The Australian National University, Canberra, Australian Capital Territory, Australia.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
2A10 antibody FAB fragment light chain
L
212N/AMutation(s): 0 
Protein Feature View is not available: No corresponding UniProt sequence found.
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
2A10 antibody FAB fragment heavy chain
H
221N/AMutation(s): 0 
Protein Feature View is not available: No corresponding UniProt sequence found.
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

Download SDF File 
Download CCD File 
H, L
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.52 Å
  • R-Value Free: 0.248 
  • R-Value Work: 0.225 
  • Space Group: I 41 3 2
Unit Cell:
Length (Å)Angle (°)
a = 204.213α = 90.00
b = 204.213β = 90.00
c = 204.213γ = 90.00
Software Package:
Software NamePurpose
XDSdata reduction
Aimlessdata scaling
PHASERphasing
PHENIXrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2017-07-26
    Type: Initial release
  • Version 1.1: 2017-08-16
    Type: Database references
  • Version 1.2: 2017-11-01
    Type: Author supporting evidence