1HXI

AN UNEXPECTED EXTENDED CONFORMATION FOR THE THIRD TPR MOTIF OF THE PEROXIN PEX5 FROM TRYPANOSOMA BRUCEI


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.6 Å
  • R-Value Free: 0.223 
  • R-Value Work: 0.186 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

An unexpected extended conformation for the third TPR motif of the peroxin PEX5 from Trypanosoma brucei.

Kumar, A.Roach, C.Hirsh, I.S.Turley, S.deWalque, S.Michels, P.A.Hol, W.G.

(2001) J.Mol.Biol. 307: 271-282

  • DOI: 10.1006/jmbi.2000.4465

  • PubMed Abstract: 
  • A number of helix-rich protein motifs are involved in a variety of critical protein-protein interactions in living cells. One of these is the tetratrico peptide repeat (TPR) motif that is involved, amongst others, in cell cycle regulation, chaperone ...

    A number of helix-rich protein motifs are involved in a variety of critical protein-protein interactions in living cells. One of these is the tetratrico peptide repeat (TPR) motif that is involved, amongst others, in cell cycle regulation, chaperone function and post-translation modifications. So far, these helix-rich TPR motifs have always been observed to be a compact unit of two helices interacting with each other in antiparallel fashion. Here, we describe the structure of the first three TPR-motifs of the peroxin PEX5 from Trypanosoma brucei, the causative agent of sleeping sickness. Peroxins are proteins involved in peroxisome, glycosome and glyoxysome biogenesis. PEX5 is the receptor of the proteins targeted to these organelles by the "peroxisomal targeting signal-1", a C-terminal tripeptide called PTS-1. The first two of the three TPR-motifs of T. brucei PEX5 appear to adopt the canonical antiparallel helix hairpin structure. In contrast, the third TPR motif of PEX5 has a dramatically different conformation in our crystals: the two helices that were supposed to form a hairpin are folded into one single 44 A long continuous helix. Such a conformation has never been observed before for a TPR motif. This raises interesting questions including the potential functional importance of a "jack-knife" conformational change in TPR motifs.


    Organizational Affiliation

    Departments of Biological Structure and Biochemistry, Biomolecular Structure Center and Howard Hughes Medical Institute, University of Washington, Seattle, WA 98195, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
PEROXISOME TARGETING SIGNAL 1 RECEPTOR PEX5
A
121Trypanosoma bruceiN/A
Find proteins for Q9U7C3 (Trypanosoma brucei)
Go to UniProtKB:  Q9U7C3
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
MG
Query on MG

Download SDF File 
Download CCD File 
A
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-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: 1.6 Å
  • R-Value Free: 0.223 
  • R-Value Work: 0.186 
  • Space Group: P 65
Unit Cell:
Length (Å)Angle (°)
a = 75.000α = 90.00
b = 75.000β = 90.00
c = 56.010γ = 120.00
Software Package:
Software NamePurpose
SCALEPACKdata scaling
REFMACrefinement
SOLVEphasing
DENZOdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2001-03-21
    Type: Initial release
  • Version 1.1: 2008-04-27
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance