title: Expression, purification, crystallization and preliminary X-ray crystallographic studies of Mycobacterium tuberculosis thioredoxin reductase.
abstract: Mycobacterium tuberculosis (H37Rv), the causative agent of the dreaded disease tuberculosis, contains three thioredoxins and a single thioredoxin reductase. Thioredoxin reductase is a member of the pyridine-nucleotide disulfide oxidoreductase family of flavoenzymes. The thioredoxin reductase gene with a His tag at the C-terminus was expressed in Escherichia coli and purified. The dimeric (70 kDa) protein was incubated with 10 mM DTT for 30 min and then crystallized using the hanging-drop vapour-diffusion method in the presence of 15% PEG 3350 and phosphate-citrate buffer pH 5 at room temperature (298 K). A diffraction data set complete to 3 A resolution has been collected under cryoconditions and the space group was determined to be P4(1)2(1)2, with unit-cell parameters a = 107.4, c = 118.2 A. Matthews coefficient calculations revealed the presence of two monomers in the asymmetric unit.
authors.affiliation: Centre For DNA Fingerprinting and Diagnostics, Hyderabad, India.
authors.forename: Mohd
authors.initials: M
authors.lastname: Akif
authors.forename: Radha
authors.initials: R
authors.lastname: Chauhan
authors.forename: Shekhar C
authors.initials: SC
authors.lastname: Mande
mesh_terms: D001426:Bacterial Proteins / Q000737:chemistry; D003001:Cloning, Molecular; D003460:Crystallization / Q000379:methods; D018360:Crystallography, X-Ray; D009169:Mycobacterium tuberculosis / Q000201:enzymology*; D013880:Thioredoxin-Disulfide Reductase / Q000737:chemistry*
chemical_list: D001426:Bacterial Proteins; D013880:Thioredoxin-Disulfide Reductase