1TPW

TRIOSEPHOSPHATE ISOMERASE DRINKS WATER TO KEEP HEALTHY


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Work: 0.202 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

The role of water in the catalytic efficiency of triosephosphate isomerase.

Zhang, Z.Komives, E.A.Sugio, S.Blacklow, S.C.Narayana, N.Xuong, N.H.Stock, A.M.Petsko, G.A.Ringe, D.

(1999) Biochemistry 38: 4389-4397

  • DOI: 10.1021/bi9826759

  • PubMed Abstract: 
  • The structural basis for the effect of the S96P mutation in chicken triosephosphate isomerase (cTIM) has been analyzed using a combination of X-ray crystallography and Fourier transform infrared spectroscopy. The X-ray structure is that of the enzyme ...

    The structural basis for the effect of the S96P mutation in chicken triosephosphate isomerase (cTIM) has been analyzed using a combination of X-ray crystallography and Fourier transform infrared spectroscopy. The X-ray structure is that of the enzyme complexed with phosphoglycolohydroxamate (PGH), an intermediate analogue, solved at a resolution of 1.9 A. The S96P mutation was identified as a second-site reverent when catalytically crippled mutants, E165D and H95N, were subjected to random mutagenesis. The presence of the second mutation leads to enhanced activity over the single mutation. However, the effect of the S96P mutation alone is to decrease the catalytic efficiency of the enzyme. The crystal structures of the S96P double mutants show that this bulky proline side chain alters the water structure within the active-site cavity (E165D; ref 1) and prevents nonproductive binding conformations of the substrate (H95N; ref 2). Comparison of the S96P single mutant structure with those of the wild-type cTIM, those of the single mutants (E165D and H95N), and those of the double mutants (E165D/S96P and H95N/S96P) begins to address the role of the conserved serine residue at this position. The results indicate that the residue positions the catalytic base E165 optimally for polarization of the substrate carbonyl, thereby aiding in proton abstraction. In addition, this residue is involved in positioning critical water molecules, thereby affecting the way in which water structure influences activity.


    Organizational Affiliation

    Department of Biochemistry, Rosenstiel Basic Medical Sciences Research Center, Brandeis University, Waltham, Massachusetts 02254-9110, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
TRIOSEPHOSPHATE ISOMERASE
A, B
247Gallus gallusGene Names: TPI1
EC: 5.3.1.1
Find proteins for P00940 (Gallus gallus)
Go to Gene View: TPI1
Go to UniProtKB:  P00940
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
PGH
Query on PGH

Download SDF File 
Download CCD File 
A, B
PHOSPHOGLYCOLOHYDROXAMIC ACID
C2 H6 N O6 P
BAXHHWZKQZIJID-UHFFFAOYSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
PGCKi: 3000 nM (88) BINDINGDB
PGHKi: 500000 nM BINDINGMOAD
PGHKi: 500000 nM PDBBIND
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Work: 0.202 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 136.200α = 90.00
b = 74.300β = 90.00
c = 53.500γ = 90.00
Software Package:
Software NamePurpose
X-PLORphasing
X-PLORmodel building
X-PLORrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1995-04-20
    Type: Initial release
  • Version 1.1: 2008-03-03
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance