4KXX

Human transketolase in covalent complex with donor ketose D-sedoheptulose-7-phosphate


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.03 Å
  • R-Value Free: 0.148 
  • R-Value Work: 0.117 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Sub-angstrom-resolution crystallography reveals physical distortions that enhance reactivity of a covalent enzymatic intermediate.

Ludtke, S.Neumann, P.Erixon, K.M.Leeper, F.Kluger, R.Ficner, R.Tittmann, K.

(2013) Nat Chem 5: 762-767

  • DOI: 10.1038/nchem.1728
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • It is recognized widely that enzymes promote reactions by providing a pathway that proceeds through a transition state of lower energy. In principle, further rate enhancements could be achieved if intermediates are prevented from relaxing to their lo ...

    It is recognized widely that enzymes promote reactions by providing a pathway that proceeds through a transition state of lower energy. In principle, further rate enhancements could be achieved if intermediates are prevented from relaxing to their lowest energy state, and thereby reduce the barrier to the subsequent transition state. Here, we report sub-ångström-resolution crystal structures of genuine covalent reaction intermediates of transketolase. These structures reveal a pronounced out-of-plane distortion of over 20° for the covalent bond that links cofactor and substrate, and a specific elongation of the scissile substrate carbon-carbon bond (d > 1.6 Å). To achieve these distortions, the protein's conformation appears to prevent relaxation of a substrate-cofactor intermediate. The results implicate a reduced barrier to the subsequent step that is consistent with an intermediate of raised energy and leads to a more efficient overall process.


    Organizational Affiliation

    Albrecht-von-Haller Institute, Göttingen Center for Molecular Biosciences, Georg-August University Göttingen, 37077 Göttingen, Germany.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Transketolase
A
637Homo sapiensMutation(s): 0 
Gene Names: TKT
EC: 2.2.1.1
Find proteins for P29401 (Homo sapiens)
Go to Gene View: TKT
Go to UniProtKB:  P29401
Small Molecules
Ligands 5 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
1Y7
Query on 1Y7

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A
(2R,3R,4S,5R,6S)-2,3,4,5,6,7-hexahydroxyheptyl dihydrogen phosphate
C7 H17 O10 P
RCCDYOCQCITNBH-CJZRUXIPSA-N
 Ligand Interaction
NA
Query on NA

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Download CCD File 
A
SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N
 Ligand Interaction
TDP
Query on TDP

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Download CCD File 
A
THIAMIN DIPHOSPHATE
C12 H18 N4 O7 P2 S
AYEKOFBPNLCAJY-UHFFFAOYSA-N
 Ligand Interaction
EDO
Query on EDO

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Download CCD File 
A
1,2-ETHANEDIOL
ETHYLENE GLYCOL
C2 H6 O2
LYCAIKOWRPUZTN-UHFFFAOYSA-N
 Ligand Interaction
MG
Query on MG

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Download CCD File 
A
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.03 Å
  • R-Value Free: 0.148 
  • R-Value Work: 0.117 
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 113.675α = 90.00
b = 86.097β = 125.43
c = 73.017γ = 90.00
Software Package:
Software NamePurpose
PDB_EXTRACTdata extraction
XSCALEdata scaling
SHELXLrefinement
SHELXrefinement
DNAdata collection
XDSdata reduction
PHENIXphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2013-08-21
    Type: Initial release
  • Version 1.1: 2013-09-04
    Type: Database references
  • Version 1.2: 2017-11-15
    Type: Refinement description