2JH1

Crystal structure of Toxoplasma gondii micronemal protein 1


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Free: 0.205 
  • R-Value Work: 0.178 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Atomic Resolution Insight Into Host Cell Recognition by Toxoplasma Gondii.

Blumenschein, T.M.A.Friedrich, N.Childs, R.A.Saouros, S.Carpenter, E.P.Campanero-Rhodes, M.A.Simpson, P.Chai, W.Koutroukides, T.Blackman, M.J.Feizi, T.Soldati-Favre, D.Matthews, S.

(2007) Embo J. 26: 2808

  • DOI: 10.1038/sj.emboj.7601704
  • Primary Citation of Related Structures:  
  • Also Cited By: 3F5E, 3F5A, 3F53

  • PubMed Abstract: 
  • The obligate intracellular parasite Toxoplasma gondii, a member of the phylum Apicomplexa that includes Plasmodium spp., is one of the most widespread parasites and the causative agent of toxoplasmosis. Micronemal proteins (MICs) are released onto th ...

    The obligate intracellular parasite Toxoplasma gondii, a member of the phylum Apicomplexa that includes Plasmodium spp., is one of the most widespread parasites and the causative agent of toxoplasmosis. Micronemal proteins (MICs) are released onto the parasite surface just before invasion of host cells and play important roles in host cell recognition, attachment and penetration. Here, we report the atomic structure for a key MIC, TgMIC1, and reveal a novel cell-binding motif called the microneme adhesive repeat (MAR). Using glycoarray analyses, we identified a novel interaction with sialylated oligosaccharides that resolves several prevailing misconceptions concerning TgMIC1. Structural studies of various complexes between TgMIC1 and sialylated oligosaccharides provide high-resolution insights into the recognition of sialylated oligosaccharides by a parasite surface protein. We observe that MAR domains exist in tandem repeats, which provide a highly specialized structure for glycan discrimination. Our work uncovers new features of parasite-receptor interactions at the early stages of host cell invasion, which will assist the design of new therapeutic strategies.


    Organizational Affiliation

    Division of Molecular Biosciences, Imperial College London, London, UK.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
MICRONEMAL PROTEIN 1
A
246Toxoplasma gondiiMutation(s): 0 
Gene Names: MIC1
Find proteins for O00834 (Toxoplasma gondii)
Go to UniProtKB:  O00834
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ACT
Query on ACT

Download SDF File 
Download CCD File 
A
ACETATE ION
C2 H3 O2
QTBSBXVTEAMEQO-UHFFFAOYSA-M
 Ligand Interaction
CL
Query on CL

Download SDF File 
Download CCD File 
A
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
GOL
Query on GOL

Download SDF File 
Download CCD File 
A
GLYCEROL
GLYCERIN; PROPANE-1,2,3-TRIOL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Free: 0.205 
  • R-Value Work: 0.178 
  • Space Group: P 43 21 2
Unit Cell:
Length (Å)Angle (°)
a = 66.192α = 90.00
b = 66.192β = 90.00
c = 172.299γ = 90.00
Software Package:
Software NamePurpose
REFMACrefinement
SOLVEphasing
SCALEPACKdata scaling
DENZOdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2007-05-22
    Type: Initial release
  • Version 1.1: 2011-05-08
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2019-01-30
    Type: Data collection, Derived calculations, Experimental preparation, Other