Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

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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: 145338.80 
• Atom Count: 10139 
• 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


• 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 

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


• 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

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
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) Go to Gene View: TKT Go to UniProtKB:  Q8MPM3

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram & Interactions
TPP	A, B	THIAMINE DIPHOSPHATE C12 H19 N4 O7 P2 S AYEKOFBPNLCAJY-UHFFFAOYSA-O
CA	A, 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 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length (Å)	Angle (°)
a = 76.800	α = 90.00
b = 120.440	β = 90.00
c = 139.150	γ = 90.00

Software Package:

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

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
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Version format compliance