2PN5

Crystal Structure of TEP1r


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.698 Å
  • R-Value Free: 0.275 
  • R-Value Work: 0.239 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Structural basis for conserved complement factor-like function in the antimalarial protein TEP1

Baxter, R.H.G.Chang, C.I.Chelliah, Y.Blandin, S.Levashina, E.A.Deisenhofer, J.

(2007) Proc.Natl.Acad.Sci.Usa 104: 11615-11620

  • DOI: 10.1073/pnas.0704967104

  • PubMed Abstract: 
  • Thioester-containing proteins (TEPs) are a major component of the innate immune response of insects to invasion by bacteria and protozoa. TEPs form a distinct clade of a superfamily that includes the pan-protease inhibitors alpha(2)-macroglobulins an ...

    Thioester-containing proteins (TEPs) are a major component of the innate immune response of insects to invasion by bacteria and protozoa. TEPs form a distinct clade of a superfamily that includes the pan-protease inhibitors alpha(2)-macroglobulins and vertebrate complement factors. The essential feature of these proteins is a sequestered thioester bond that, after cleavage in a protease-sensitive region of the protein, is activated and covalently binds to its target. Recently, TEP1 from the malarial vector Anopheles gambiae was shown to mediate recognition and killing of ookinetes from the malarial parasite Plasmodium berghei, a model for the human malarial parasite Plasmodium falciparum. Here, we present the crystal structure of the TEP1 isoform TEP1r. Although the overall protein fold of TEP1r resembles that of complement factor C3, the TEP1r domains are repositioned to stabilize the inactive conformation of the molecule (containing an intact thioester) in the absence of the anaphylotoxin domain, a central component of complement factors. The structure of TEP1r provides a molecular basis for the differences between TEP1 alleles TEP1r and TEP1s, which correlate with resistance of A. gambiae to infection by P. berghei.


    Organizational Affiliation

    Howard Hughes Medical Institute and Department of Biochemistry, University of Texas Southwestern Medical Center, 6001 Forest Park Road, Dallas, TX 75390-9050, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Thioester-containing protein I
A
1325Anopheles gambiaeMutation(s): 0 
Gene Names: TEP-I
Find proteins for Q9GYW4 (Anopheles gambiae)
Go to UniProtKB:  Q9GYW4
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NA
Query on NA

Download SDF File 
Download CCD File 
A
SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N
 Ligand Interaction
NAG
Query on NAG

Download SDF File 
Download CCD File 
A
N-ACETYL-D-GLUCOSAMINE
C8 H15 N O6
OVRNDRQMDRJTHS-FMDGEEDCSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.698 Å
  • R-Value Free: 0.275 
  • R-Value Work: 0.239 
  • Space Group: P 43 21 2
Unit Cell:
Length (Å)Angle (°)
a = 150.515α = 90.00
b = 150.515β = 90.00
c = 226.315γ = 90.00
Software Package:
Software NamePurpose
RESOLVEphasing
PDB_EXTRACTdata extraction
HKL-2000data collection
HKL-2000data reduction
MLPHAREphasing
SCALEPACKdata scaling
DENZOdata reduction
REFMACrefinement
HKL-2000data scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2007-04-23 
  • Released Date: 2007-07-24 
  • Deposition Author(s): Baxter, R.H.G.

Revision History 

  • Version 1.0: 2007-07-24
    Type: Initial release
  • Version 1.1: 2008-05-01
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Advisory, Version format compliance
  • Version 1.3: 2017-10-18
    Type: Refinement description