Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

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

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

Macromolecule Content

• Total Structure Weight: 145.34 kDa 
• Atom Count: 11050 
• Modelled Residue Count: 1341 
• Deposited Residue Count: 1346 
• Unique protein chains: 1

1R9J

Transketolase from Leishmania mexicana

• DOI: 10.2210/pdb1R9J/pdb

• Classification: TRANSFERASE
• Organism(s): Leishmania mexicana mexicana
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2003-10-30 Released: 2004-11-09 
• Deposition Author(s): Veitch, N.J., Mauger, D.A., Cazzulo, J.J., Lindqvist, Y., Barrett, M.P.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.22 Å
• R-Value Free: 0.213 
• R-Value Work: 0.170 
• R-Value Observed: 0.172 

Literature

Transketolase from Leishmania mexicana has a dual subcellular localization.

Veitch, N.J., Maugeri, D.A., Cazzulo, J.J., Lindqvist, Y., Barrett, M.P.

(2004) Biochem J 382: 759-767

• PubMed: 15149284 
• DOI: 10.1042/BJ20040459
• Primary Citation of Related Structures:  
  1R9J


• PubMed Abstract: 
  

Transketolase has been characterized in Leishmania mexicana. A gene encoding this enzyme was identified and cloned. The gene was expressed in Escherichia coli and the protein was purified and characterized. An apparent K(m) of 2.75 mM for ribose 5-phosphate was determined. X-ray crystallography was used to determine the three-dimensional structure of the enzyme to a resolution of 2.2 A (1 A identical with 0.1 nm). The C-terminus of the protein contains a type-1 peroxisome-targeting signal, suggestive of a possible glycosomal subcellular localization. Subcellular localization experiments performed with promastigote forms of the parasite revealed that the protein was predominantly cytosolic, although a significant component of the total activity was associated with the glycosomes. Transketolase is thus the first enzyme of the nonoxidative branch of the pentose phosphate pathway whose presence has been demonstrated in a peroxisome-like organelle.

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Organizational Affiliation: 

Division of Infection and Immunity, Institute of Biomedical and Life Sciences, Joseph Black Building, University of Glasgow, Glasgow G12 8QQ, Scotland, UK.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
transketolase	A, B	673	Leishmania mexicana mexicana	Mutation(s): 0  Gene Names: TKT EC: 2.2.1.1
Find proteins for Q8MPM3 (Leishmania mexicana mexicana) Explore Q8MPM3  Go to UniProtKB:  Q8MPM3

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
TPP	D [auth A], F [auth B]	THIAMINE DIPHOSPHATE C12 H19 N4 O7 P2 S AYEKOFBPNLCAJY-UHFFFAOYSA-O
CA	C [auth A], E [auth B]	CALCIUM ION Ca BHPQYMZQTOCNFJ-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.22 Å
• R-Value Free: 0.213 
• R-Value Work: 0.170 
• R-Value Observed: 0.172 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 76.8	α = 90
b = 120.44	β = 90
c = 139.15	γ = 90

Software Package:

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

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2003-10-30 
• Released Date: 2004-11-09 
Deposition Author(s): Veitch, N.J., Mauger, D.A., Cazzulo, J.J., Lindqvist, Y., Barrett, M.P.

Revision History  

• Version 1.0: 2004-11-09
  Type: Initial release
  
• Version 1.1: 2008-04-29
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance