3TKF

1.5 Angstrom Resolution Crystal Structure of K135M Mutant of Transaldolase B (TalA) from Francisella tularensis in Complex with Sedoheptulose 7-phosphate.


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.50 Å
  • R-Value Free: 0.159 
  • R-Value Work: 0.144 
  • R-Value Observed: 0.145 

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Ligand Structure Quality Assessment 


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 D Biol Crystallogr 70: 544-552

  • DOI: 10.1107/S1399004713030666
  • Primary Citation of Related Structures:  
    3TE9, 3TK7, 3TKF, 3TNO, 4E0C

  • 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 context of enzyme catalysis, interactions with the protein constrain substrate rotation, which could necessitate structural transformations during bond formation ...

    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:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
TransaldolaseA, B345Francisella tularensis subsp. tularensisMutation(s): 1 
Gene Names: FTT_1093ctalA
EC: 2.2.1.2
UniProt
Find proteins for Q5NFX0 (Francisella tularensis subsp. tularensis (strain SCHU S4 / Schu 4))
Explore Q5NFX0 
Go to UniProtKB:  Q5NFX0
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ5NFX0
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
I22
Query on I22

Download Ideal Coordinates CCD File 
C [auth A],
I [auth B]
D-ALTRO-HEPT-2-ULOSE 7-PHOSPHATE
C7 H15 O10 P
JDTUMPKOJBQPKX-GBNDHIKLSA-N
 Ligand Interaction
EPE
Query on EPE

Download Ideal Coordinates CCD File 
D [auth A],
E [auth A],
J [auth B],
K [auth B]
4-(2-HYDROXYETHYL)-1-PIPERAZINE ETHANESULFONIC ACID
C8 H18 N2 O4 S
JKMHFZQWWAIEOD-UHFFFAOYSA-N
 Ligand Interaction
PEG
Query on PEG

Download Ideal Coordinates CCD File 
F [auth A],
G [auth A],
H [auth A],
L [auth B],
M [auth B],
F [auth A],
G [auth A],
H [auth A],
L [auth B],
M [auth B],
N [auth B],
P [auth B]
DI(HYDROXYETHYL)ETHER
C4 H10 O3
MTHSVFCYNBDYFN-UHFFFAOYSA-N
 Ligand Interaction
GOL
Query on GOL

Download Ideal Coordinates CCD File 
O [auth B]GLYCEROL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

Unit Cell:
Length ( Å )Angle ( ˚ )
a = 54.827α = 90
b = 87.194β = 90
c = 141.136γ = 90
Software Package:
Software NamePurpose
Blu-Icedata collection
PHASERphasing
REFMACrefinement
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Ligand Structure Quality Assessment 



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2011-09-07
    Type: Initial release
  • Version 1.1: 2014-03-05
    Changes: Database references
  • Version 1.2: 2017-11-08
    Changes: Advisory, Refinement description