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 Å, 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.
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http://dx.doi.org/10.1107/S1744309111009274 | DOI Listing |
Biochemistry
July 2015
Göttingen Center for Molecular Biosciences, Department of Molecular Enzymology, Georg-August University Göttingen, Ernst-Caspari-Haus, Justus-von-Liebig-Weg 11, D-37077 Göttingen, Germany.
Transaldolase (TAL) and fructose-6-phosphate aldolase (FSA) both belong to the class I aldolase family and share a high degree of structural similarity and sequence identity. The molecular basis of the different reaction specificities (transferase vs aldolase) has remained enigmatic. A notable difference between the active sites is the presence of either a TAL-specific Glu (Gln in FSA) or a FSA-specific Tyr (Phe in TAL).
View Article and Find Full Text PDFNat Chem Biol
August 2011
Albrecht-von-Haller-Institut and Göttingen Center for Molecular Biosciences, Georg-August-Universität Göttingen, Göttingen, Germany.
We examined the catalytic cycle of transaldolase (TAL) from Thermoplasma acidophilum by cryocrystallography and were able to structurally characterize--for the first time, to our knowledge--different genuine TAL reaction intermediates. These include the Schiff base adducts formed between the catalytic lysine and the donor ketose substrates fructose-6-phosphate and sedoheptulose-7-phosphate as well as the Michaelis complex with acceptor aldose erythrose-4-phosphate. These structural snapshots necessitate a revision of the accepted reaction mechanism with respect to functional roles of active site residues, and they further reveal fundamental insights into the general structural features of enzymatic Schiff base intermediates and the role of conformational dynamics in enzyme catalysis, substrate binding and discrimination.
View Article and Find Full Text PDFActa Crystallogr Sect F Struct Biol Cryst Commun
May 2011
Göttinger Zentrum für Molekulare Biowissenschaften, Georg-August-Universität Göttingen, Ernst-Caspari-Haus, Justus-von-Liebig-Weg 11, D-37077 Göttingen, Germany.
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.
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