Crystallization and preliminary X-ray diffraction analysis of transaldolase from Thermoplasma acidophilum

The metabolic enzyme transaldolase from Thermoplasma acidophilum was recombinantly expressed in Escherichia coli and could be crystallized in two polymorphic forms. Crystals were grown by the hanging-drop vapour-diffusion method using PEG 6000 as precipitant. Native data sets for crystal forms 1 and 2 were collected in-house to resolutions of 3.0 and 2.7 angstrom, respectively. Crystal form 1 belonged to the orthorhombic space group C222(1) with five monomers per asymmetric unit and crystal form 2 belonged to the monoclinic space group P2(1) with ten monomers per asymmetric unit.