4E6Z

Tic22 from Plasmodium falciparum


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.1501 Å
  • R-Value Free: 0.242 
  • R-Value Work: 0.217 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Tic22 is an essential chaperone required for protein import into the apicoplast.

Glaser, S.van Dooren, G.G.Agrawal, S.Brooks, C.F.McFadden, G.I.Striepen, B.Higgins, M.K.

(2012) J.Biol.Chem. 287: 39505-39512

  • DOI: 10.1074/jbc.M112.405100

  • PubMed Abstract: 
  • Most plastids proteins are post-translationally imported into organelles through multisubunit translocons. The TIC and TOC complexes perform this role in the two membranes of the plant chloroplast and in the inner two membranes of the apicoplasts of ...

    Most plastids proteins are post-translationally imported into organelles through multisubunit translocons. The TIC and TOC complexes perform this role in the two membranes of the plant chloroplast and in the inner two membranes of the apicoplasts of the apicomplexan parasites, Toxoplasma gondii and Plasmodium falciparum. Tic22 is a ubiquitous intermembrane translocon component that interacts with translocating proteins. Here, we demonstrate that T. gondii Tic22 is an apicoplast-localized protein, essential for parasite survival and protein import into the apicoplast stroma. The structure of Tic22 from P. falciparum reveals a fold conserved from cyanobacteria to plants, which displays a non-polar groove on each side of the molecule. We show that these grooves allow Tic22 to act as a chaperone. General chaperones are common components of protein translocation systems where they maintain cargo proteins in an unfolded conformation during transit. Such a chaperone had not been identified in the intermembrane space of plastids and we propose that Tic22 fulfills this role.


    Organizational Affiliation

    Department of Biochemistry, University of Cambridge, Cambridge, CB2 1GA, England.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Apicoplast TIC22, putative
A
279Plasmodium falciparum (isolate 3D7)N/A
Find proteins for Q8I3H4 (Plasmodium falciparum (isolate 3D7))
Go to UniProtKB:  Q8I3H4
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
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
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MSE
Query on MSE
A
L-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.1501 Å
  • R-Value Free: 0.242 
  • R-Value Work: 0.217 
  • Space Group: P 41 21 2
Unit Cell:
Length (Å)Angle (°)
a = 66.250α = 90.00
b = 66.250β = 90.00
c = 129.370γ = 90.00
Software Package:
Software NamePurpose
ADSCdata collection
MOSFLMdata reduction
SCALAdata scaling
SHARPphasing
PHENIXrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2012-10-10
    Type: Initial release
  • Version 1.1: 2012-11-07
    Type: Database references
  • Version 1.2: 2012-12-05
    Type: Database references