1ITZ | pdb_00001itz

Maize Transketolase in complex with TPP

• PDB DOI: https://doi.org/10.2210/pdb1ITZ/pdb

• Classification: TRANSFERASE
• Organism(s): Zea mays
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2002-02-15 Released: 2003-02-15 
• Deposition Author(s): Gerhardt, S., Echt, S., Bader, G., Freigang, J., Busch, M., Bacher, A., Huber, R., Fischer, M.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.30 Å
• R-Value Free: 
  0.200 (Depositor) 
• R-Value Work: 
  0.166 (Depositor) 
• R-Value Observed: 
  0.167 (Depositor) 

Literature

Structure and properties of an engineered transketolase from maize

Gerhardt, S., Echt, S., Busch, M., Freigang, J., Auerbach, G., Bader, G., Martin, W.F., Bacher, A., Huber, R., Fischer, M.

(2003) Plant Physiol 132: 1941-1949

• PubMed: 12913150 
• DOI: https://doi.org/10.1104/pp.103.020982
• Primary Citation Related Structures: 
  1ITZ


• PubMed Abstract: 
  

  The gene specifying plastid transketolase (TK) of maize (Zea mays) was cloned from a cDNA library by southern blotting using a heterologous probe from sorghum (Sorghum bicolor). A recombinant fusion protein comprising thioredoxin of Escherichia coli and mature TK of maize was expressed at a high level in E. coli and cleaved with thrombin, affording plastid TK. The protein in complex with thiamine pyrophoshate was crystallized, and its structure was solved by molecular replacement. The enzyme is a C2 symmetric homodimer closely similar to the enzyme from yeast (Saccharomyces cerevisiae). Each subunit is folded into three domains. The two topologically equivalent active sites are located in the subunit interface region and resemble those of the yeast enzyme.

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Organizational Affiliation: 
• Lehrstuhl für Organische Chemie und Biochemie, Technische Universität München, Lichtenbergstrasse 4, D-85747 Garching, Germany.

Biological Assembly 1  

Global Symmetry: Cyclic - C2  (Explore in 3D)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 1 assigned by authors and generated by PISA (software)

Biological Assembly 2  

Global Symmetry: Cyclic - C2  (Explore in 3D)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 2 assigned by authors.

Macromolecule Content 

• Total Structure Weight: 220.57 kDa 
• Atom Count: 15,767 
• Modeled Residue Count: 1,998 
• Deposited Residue Count: 2,025 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Transketolase	A, B, C	675	Zea mays	Mutation(s): 0  EC: 2.2.1.1
UniProt
Find proteins for Q7SIC9 (Zea mays) Explore Q7SIC9  Go to UniProtKB:  Q7SIC9

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
TPP	E [auth A], G [auth B], I [auth C]	THIAMINE DIPHOSPHATE C12 H19 N4 O7 P2 S AYEKOFBPNLCAJY-UHFFFAOYSA-O
MG	D [auth A], F [auth B], H [auth C]	MAGNESIUM ION Mg JLVVSXFLKOJNIY-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.30 Å
• R-Value Free:  0.200 (Depositor) 
• R-Value Work:  0.166 (Depositor) 
• R-Value Observed: 0.167 (Depositor) 

Space Group: P 3₁ 2 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 136.438	α = 90
b = 136.438	β = 90
c = 203.731	γ = 120

Software Package:

Software Name	Purpose
MOSFLM	data reduction
SCALA	data scaling
CNS	refinement
CCP4	data scaling
CNS	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 2003-02-15 
Deposition Author(s): Gerhardt, S., Echt, S., Bader, G., Freigang, J., Busch, M., Bacher, A., Huber, R., Fischer, M.

Revision History  

• Version 1.0: 2003-02-15
  Type: Initial release
  
• Version 1.1: 2008-04-27
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2023-12-27
  Changes: Data collection, Database references, Derived calculations