3CWN

Escherichia coli transaldolase b mutant f178y

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.40 Å
  • R-Value Free: 0.173 
  • R-Value Work: 0.149 
  • R-Value Observed: 0.150 

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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
  • Primary Citation of Related Structures:  
    3CWN

  • 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 gly ...

    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, Universität Stuttgart, 70550 Stuttgart, Germany.



Macromolecules
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(by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Transaldolase B A, B337Escherichia coliMutation(s): 2 
Gene Names: talB, yaaK
EC: 2.2.1.2
Find proteins for K0BE10 (Escherichia coli O104:H4 (strain 2009EL-2071))
Explore K0BE10 
Go to UniProtKB:  K0BE10
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.40 Å
  • R-Value Free: 0.173 
  • R-Value Work: 0.149 
  • R-Value Observed: 0.150 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 65.864α = 90
b = 86.173β = 90
c = 131.191γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
DNAdata collection
MOSFLMdata reduction
SCALAdata scaling
MOLREPphasing

Structure Validation

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Entry History 

Deposition Data

Revision History 

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