3CWN

Escherichia coli transaldolase b mutant f178y


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.4 Å
  • R-Value Free: 0.173 
  • R-Value Work: 0.149 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Replacement of a Phenylalanine by a Tyrosine in the Active Site Confers Fructose-6-phosphate Aldolase Activity to the Transaldolase of Escherichia coli and Human Origin.

Schneider, S.Sandalova, T.Schneider, G.Sprenger, G.A.Samland, A.K.

(2008) J.Biol.Chem. 283: 30064-30072

  • DOI: 10.1074/jbc.M803184200

  • PubMed Abstract: 
  • Based on a structure-assisted sequence alignment we designed 11 focused libraries at residues in the active site of transaldolase B from Escherichia coli and screened them for their ability to synthesize fructose 6-phosphate from dihydroxyacetone and ...

    Based on a structure-assisted sequence alignment we designed 11 focused libraries at residues in the active site of transaldolase B from Escherichia coli and screened them for their ability to synthesize fructose 6-phosphate from dihydroxyacetone and glyceraldehyde 3-phosphate using a newly developed color assay. We found one positive variant exhibiting a replacement of Phe(178) to Tyr. This mutant variant is able not only to transfer a dihydroxyacetone moiety from a ketose donor, fructose 6-phosphate, onto an aldehyde acceptor, erythrose 4-phosphate (14 units/mg), but to use it as a substrate directly in an aldolase reaction (7 units/mg). With a single amino acid replacement the fructose-6-phosphate aldolase activity was increased considerably (>70-fold compared with wild-type). Structural studies of the wild-type and mutant protein suggest that this is due to a different H-bond pattern in the active site leading to a destabilization of the Schiff base intermediate. Furthermore, we show that a homologous replacement has a similar effect in the human transaldolase Taldo1 (aldolase activity, 14 units/mg). We also demonstrate that both enzymes TalB and Taldo1 are recognized by the same polyclonal antibody.


    Organizational Affiliation

    Institute of Microbiology, Universit├Ąt Stuttgart, 70550 Stuttgart, Germany.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Transaldolase B
A, B
337Escherichia coli O104:H4 (strain 2009EL-2071)Mutation(s): 2 
Gene Names: tal
EC: 2.2.1.2
Find proteins for K0BE10 (Escherichia coli O104:H4 (strain 2009EL-2071))
Go to UniProtKB:  K0BE10
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

Download SDF File 
Download CCD File 
A, B
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.4 Å
  • R-Value Free: 0.173 
  • R-Value Work: 0.149 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 65.864α = 90.00
b = 86.173β = 90.00
c = 131.191γ = 90.00
Software Package:
Software NamePurpose
MOSFLMdata reduction
SCALAdata scaling
MOLREPphasing
REFMACrefinement
DNAdata collection

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

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