2V2C

The A178L mutation in the C-terminal hinge of the flexible loop-6 of triosephosphate isomerase (TIM) induces a more closed conformation of this hinge region in dimeric and monomeric TIM


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.89 Å
  • R-Value Free: 0.182 
  • R-Value Work: 0.139 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structural Studies Show that the A178L Mutation in the C-Terminal Hinge of the Catalytic Loop-6 of Triosephosphate Isomerase (Tim) Induces a Closed-Like Conformation in Dimeric and Monomeric Tim.

Alahuhta, M.Casteleijn, M.G.Neubauer, P.Wierenga, R.K.

(2008) Acta Crystallogr.,Sect.D 64: 178

  • DOI: 10.1107/S0907444907059021
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The flexible catalytic loop, loop-6, of TIM has evolved to preferably be open in the unliganded state and to preferably be closed in the liganded state. The N-terminal and C-terminal hinges of this loop are important for its opening/closing mechanism ...

    The flexible catalytic loop, loop-6, of TIM has evolved to preferably be open in the unliganded state and to preferably be closed in the liganded state. The N-terminal and C-terminal hinges of this loop are important for its opening/closing mechanism. In this study, a small conserved C-terminal hinge residue, Ala178, has been mutated into a residue with a larger side chain, Leu178. This mutation has been made in the dimeric trypanosomal wild-type TIM (wtTIM) and in its mutated catalytically competent monomeric variant (ml1TIM). The variants are referred to as A178L and ml1A178L, respectively. Crystal structures have been determined of unliganded A178L (at 2.2 A), liganded A178L (at 1.89 A), unliganded ml1A178L (at 2.3 A) and liganded ml1A178L (at 1.18 A) using the transition-state analogue 2-phosphoglycolate as a ligand. Structural characterization of the two variants shows that this mutation favours the closed conformation of the C-terminal hinge region, even in the absence of ligand. In the structure of the unliganded A178L variant a range of new loop-6 conformations are observed, including subunits in which the tip of loop-6 is completely disordered. The catalytic efficiency of A178L is lower than that of wtTIM, which correlates with the structural differences between the apo forms of wtTIM and A178L, in particular the more disordered loop-6 in the structure of unliganded A178L. In the liganded structures of A178L and ml1A178L the structural differences induced by the mutation are minimal. Structural characterization of the ml1A178L variant highlights its structural plasticity.


    Organizational Affiliation

    Biocenter Oulu and Department of Biochemistry, University of Oulu, PO Box 3000, FIN-90014 University of Oulu, Finland.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
TRIOSEPHOSPHATE ISOMERASE GLYCOSOMAL
A
250Trypanosoma brucei bruceiMutation(s): 1 
EC: 5.3.1.1
Find proteins for P04789 (Trypanosoma brucei brucei)
Go to UniProtKB:  P04789
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

Download SDF File 
Download CCD File 
A
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
PGA
Query on PGA

Download SDF File 
Download CCD File 
A
2-PHOSPHOGLYCOLIC ACID
C2 H5 O6 P
ASCFNMCAHFUBCO-UHFFFAOYSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
PGAKi: 390000 nM BINDINGMOAD
2PGKi: 390000 nM PDBBIND
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.89 Å
  • R-Value Free: 0.182 
  • R-Value Work: 0.139 
  • Space Group: P 21 21 2
Unit Cell:
Length (Å)Angle (°)
a = 119.230α = 90.00
b = 59.290β = 90.00
c = 46.950γ = 90.00
Software Package:
Software NamePurpose
REFMACrefinement
XDSdata reduction
XDSdata scaling
MOLREPphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2008-02-19
    Type: Initial release
  • Version 1.1: 2011-05-08
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance