4MDV

Crystal structure of calcium-bound annexin (Sm)1


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.5 Å
  • R-Value Free: 0.257 
  • R-Value Work: 0.190 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Crystal structure and immunological properties of the first annexin from Schistosoma mansoni: insights into the structural integrity of the schistosomal tegument.

Leow, C.Y.Willis, C.Osman, A.Mason, L.Simon, A.Smith, B.J.Gasser, R.B.Jones, M.K.Hofmann, A.

(2014) Febs J. 281: 1209-1225

  • DOI: 10.1111/febs.12700
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Schistosomiasis is a major parasitic disease of humans, second only to malaria in its global impact. The disease is caused by digenean trematodes that infest the vasculature of their human hosts. These flukes are limited externally by a body wall com ...

    Schistosomiasis is a major parasitic disease of humans, second only to malaria in its global impact. The disease is caused by digenean trematodes that infest the vasculature of their human hosts. These flukes are limited externally by a body wall composed of a syncytial epithelium, the apical surface membrane of which is a parasitism-adapted dual membrane complex. Annexins are thought to be of integral importance for the stability of this apical membrane system. Here, we present the first structural and immunobiochemical characterization of an annexin from Schistosoma mansoni. The crystal structure of annexin B22 confirms the presence of the previously predicted α-helical segment in the II/III linker and reveals a covalently linked head-to-head dimer. From the calcium-bound crystal structure of this protein, canonical type II, type III and B site positions are occupied, and a novel binding site has been identified. The dimer arrangement observed in the crystal structure suggests the presence of two prominent features, a potential non-canonical membrane binding site and a potential binding groove opposite to the former. Results from transcriptional profiling during development show that annexin B22 expression is correlated with life stages of the parasite that possess the syncytial tegument layer, and ultrastructural localization by immuno-electron microscopy confirms the occurrence of annexins in the tegument of S. mansoni. Data from membrane binding and aggregation assays indicate the presence of differential molecular mechanisms and support the hypothesis of annexin B22 providing structural integrity in the tegument.


    Organizational Affiliation

    School of Veterinary Science, University of Queensland, Gatton, Australia; Queensland Institute of Medical Research, Herston, Australia; Institute for Research in Molecular Medicine, Universiti Sains Malaysia, Penang, Malaysia.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Annexin
A, B
375Schistosoma mansoniMutation(s): 0 
Find proteins for C4QH88 (Schistosoma mansoni)
Go to UniProtKB:  C4QH88
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CA
Query on CA

Download SDF File 
Download CCD File 
A, B
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.5 Å
  • R-Value Free: 0.257 
  • R-Value Work: 0.190 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 67.822α = 90.00
b = 88.486β = 111.18
c = 68.465γ = 90.00
Software Package:
Software NamePurpose
PHENIXrefinement
SCALAdata scaling
ADSCdata collection
PHASERphasing
XDSdata reduction
PHENIXphasing
PHENIXmodel building

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2013-08-23 
  • Released Date: 2014-02-26 
  • Deposition Author(s): Hofmann, A.

Revision History 

  • Version 1.0: 2014-02-26
    Type: Initial release
  • Version 1.1: 2015-03-04
    Type: Database references