2JGQ

Kinetics and structural properties of triosephosphate isomerase from Helicobacter pylori


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.3 Å
  • R-Value Free: 0.249 
  • R-Value Work: 0.200 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Kinetics and Structural Properties of Triosephosphate Isomerase from Helicobacter Pylori

Chu, C.-H.Lai, Y.-J.Sun, Y.-J.

(2008) Proteins: Struct., Funct., Bioinf. 71: 396

  • DOI: 10.1002/prot.21709

  • PubMed Abstract: 
  • Triosephosphate isomerase (TIM) catalyzes the interconversion between dihydroxyacetone phosphate and D-glyceraldehyde-3-phosphate in the glycolysis-gluconeogenesis metabolism pathway. The Helicobacter pylori TIM gene (HpTIM) was cloned, and HpTIM was ...

    Triosephosphate isomerase (TIM) catalyzes the interconversion between dihydroxyacetone phosphate and D-glyceraldehyde-3-phosphate in the glycolysis-gluconeogenesis metabolism pathway. The Helicobacter pylori TIM gene (HpTIM) was cloned, and HpTIM was expressed and purified. The enzymatic activity of HpTIM for the substrate GAP was determined (K(m) = 3.46 +/- 0.23 mM and k(cat) = 8.8 x 10(4) min(-1)). The crystal structure of HpTIM was determined by molecular replacement at 2.3 A resolution. The overall structure of HpTIM was (beta/alpha)beta(beta/alpha)(6), which resembles the common TIM barrel fold, (beta/alpha)(8); however, a helix is missing after the second beta-strand. The conformation of loop 6 and binding of phosphate ion suggest that the determined structure of HpTIM was in the "closed" state. A highly conserved Arg-Asp salt bridge in the "DX(D/N)G" motif of most TIMs is absent in HpTIM because the sequence of this motif is "(211)SVDG(214)." To determine the significance of this salt bridge to HpTIM, four mutants, including K183S, K183A, D213Q, and D213A, were constructed and characterized. The results suggest that this conserved salt bridge is not essential for the enzymatic activity of HpTIM; however, it might contribute to the conformational stability of HpTIM.


    Organizational Affiliation

    Institute of Bioinformatics and Structural Biology, National Tsing Hua University, Hsinchu 30013, Taiwan, Republic of China.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
TRIOSEPHOSPHATE ISOMERASE
A, B
233Helicobacter pylori (strain ATCC 700392 / 26695)Mutation(s): 0 
Gene Names: tpiA (tpi)
EC: 5.3.1.1
Find proteins for P56076 (Helicobacter pylori (strain ATCC 700392 / 26695))
Go to UniProtKB:  P56076
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
PO4
Query on PO4

Download SDF File 
Download CCD File 
A, B
PHOSPHATE ION
O4 P
NBIIXXVUZAFLBC-UHFFFAOYSA-K
 Ligand Interaction
QGA
Query on QGA

Download SDF File 
Download CCD File 
A
1-[(3-CYCLOHEXYLPROPANOYL)(2-HYDROXYETHYL)AMINO]-1-DEOXY-D-ALLITOL
C17 H33 N O7
AHJZPLOICPCLQM-HDEZJCGLSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.3 Å
  • R-Value Free: 0.249 
  • R-Value Work: 0.200 
  • Space Group: P 21 21 2
Unit Cell:
Length (Å)Angle (°)
a = 128.167α = 90.00
b = 76.657β = 90.00
c = 49.187γ = 90.00
Software Package:
Software NamePurpose
CNSrefinement
DENZOdata reduction
SCALEPACKdata scaling
MOLREPphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2008-02-26
    Type: Initial release
  • Version 1.1: 2011-05-08
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance