3TNO

1.65 Angstrom Resolution Crystal Structure of Transaldolase B (TalA) from Francisella tularensis in Covalent Complex with Sedoheptulose-7-Phosphate


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.65 Å
  • R-Value Free: 0.203 
  • R-Value Work: 0.173 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Adherence to Burgi-Dunitz stereochemical principles requires significant structural rearrangements in Schiff-base formation: insights from transaldolase complexes.

Light, S.H.Minasov, G.Duban, M.E.Anderson, W.F.

(2014) Acta Crystallogr.,Sect.D 70: 544-552

  • DOI: 10.1107/S1399004713030666
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The Bürgi-Dunitz angle (αBD) describes the trajectory of approach of a nucleophile to an electrophile. The adoption of a stereoelectronically favorable αBD can necessitate significant reactive-group repositioning over the course of bond formation. In ...

    The Bürgi-Dunitz angle (αBD) describes the trajectory of approach of a nucleophile to an electrophile. The adoption of a stereoelectronically favorable αBD can necessitate significant reactive-group repositioning over the course of bond formation. In the context of enzyme catalysis, interactions with the protein constrain substrate rotation, which could necessitate structural transformations during bond formation. To probe this theoretical framework vis-à-vis biocatalysis, Schiff-base formation was analysed in Francisella tularensis transaldolase (TAL). Crystal structures of wild-type and Lys→Met mutant TAL in covalent and noncovalent complexes with fructose 6-phosphate and sedoheptulose 7-phosphate clarify the mechanism of catalysis and reveal that substrate keto moieties undergo significant conformational changes during Schiff-base formation. Structural changes compelled by the trajectory considerations discussed here bear relevance to bond formation in a variety of constrained enzymic/engineered systems and can inform the design of covalent therapeutics.


    Organizational Affiliation

    Center for Structural Genomics of Infectious Diseases, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Transaldolase
A, B
345Francisella tularensis subsp. tularensis (strain SCHU S4 / Schu 4)Mutation(s): 0 
Gene Names: talA (tal)
EC: 2.2.1.2
Find proteins for Q5NFX0 (Francisella tularensis subsp. tularensis (strain SCHU S4 / Schu 4))
Go to UniProtKB:  Q5NFX0
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
I22
Query on I22

Download SDF File 
Download CCD File 
A, B
D-ALTRO-HEPT-2-ULOSE 7-PHOSPHATE
7-O-PHOSPHONO-D-ALTRO-HEPT-2-ULOSE; SEDOHEPTULOSE 7-PHOSPHATE
C7 H15 O10 P
JDTUMPKOJBQPKX-GBNDHIKLSA-N
 Ligand Interaction
CL
Query on CL

Download SDF File 
Download CCD File 
A
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
Experimental Data & Validation

Experimental Data

Unit Cell:
Length (Å)Angle (°)
a = 56.316α = 90.00
b = 74.091β = 90.00
c = 165.423γ = 90.00
Software Package:
Software NamePurpose
HKL-2000data scaling
HKL-2000data reduction
Blu-Icedata collection
PHASERphasing
REFMACrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2011-09-14
    Type: Initial release
  • Version 1.1: 2014-03-05
    Type: Database references
  • Version 1.2: 2017-11-08
    Type: Refinement description