Pyruvate carboxylase from Corynebacterium glutamicum : purification and characterization. 2019

Maike Kortmann, and Meike Baumgart, and Michael Bott
IBG-1: Biotechnology, Institute of Bio- and Geosciences, Forschungszentrum Jülich, 52425, Jülich, Germany.

Pyruvate carboxylase of Corynebacterium glutamicum serves as anaplerotic enzyme when cells are growing on carbohydrates and plays an important role in the industrial production of metabolites derived from the tricarboxylic acid cycle, such as L-glutamate or L-lysine. Previous studies suggested that the enzyme from C. glutamicum is very labile, as activity could only be measured in permeabilized cells, but not in cell-free extracts. In this study, we established conditions allowing activity measurements in cell-free extracts of C. glutamicum and purification of the enzyme by avidin affinity chromatography and gel filtration. Using a coupled enzymatic assay with malate dehydrogenase, Vmax values between 20 and 25 μmol min-1 mg-1 were measured for purified pyruvate carboxylase corresponding to turnover numbers of 160 - 200 s-1 for the tetrameric enzyme. The concentration dependency for pyruvate and ATP followed Michaelis-Menten kinetics with Km values of 3.76 ± 0.72 mM and 0.61 ± 0.13 mM, respectively. For bicarbonate, concentrations ≥5 mM were required to obtain activity and half-maximal rates were found at 13.25 ± 4.88 mM. ADP and aspartate inhibited PCx activity with apparent Ki values of 1.5 mM and 9.3 mM, respectively. Acetyl-CoA had a weak inhibitory effect, but only at low concentrations up to 50 μM. The results presented here enable further detailed biochemical and structural studies of this enzyme.

UI MeSH Term Description Entries
D007700 Kinetics The rate dynamics in chemical or physical systems.
D011766 Pyruvate Carboxylase A biotin-dependent enzyme belonging to the ligase family that catalyzes the addition of CARBON DIOXIDE to pyruvate. It is occurs in both plants and animals. Deficiency of this enzyme causes severe psychomotor retardation and ACIDOSIS, LACTIC in infants. EC 6.4.1.1. Carboxylase, Pyruvate
D002846 Chromatography, Affinity A chromatographic technique that utilizes the ability of biological molecules, often ANTIBODIES, to bind to certain ligands specifically and reversibly. It is used in protein biochemistry. (McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed) Chromatography, Bioaffinity,Immunochromatography,Affinity Chromatography,Bioaffinity Chromatography
D002850 Chromatography, Gel Chromatography on non-ionic gels without regard to the mechanism of solute discrimination. Chromatography, Exclusion,Chromatography, Gel Permeation,Chromatography, Molecular Sieve,Gel Filtration,Gel Filtration Chromatography,Chromatography, Size Exclusion,Exclusion Chromatography,Gel Chromatography,Gel Permeation Chromatography,Molecular Sieve Chromatography,Chromatography, Gel Filtration,Exclusion Chromatography, Size,Filtration Chromatography, Gel,Filtration, Gel,Sieve Chromatography, Molecular,Size Exclusion Chromatography
D004791 Enzyme Inhibitors Compounds or agents that combine with an enzyme in such a manner as to prevent the normal substrate-enzyme combination and the catalytic reaction. Enzyme Inhibitor,Inhibitor, Enzyme,Inhibitors, Enzyme
D006863 Hydrogen-Ion Concentration The normality of a solution with respect to HYDROGEN ions; H+. It is related to acidity measurements in most cases by pH pH,Concentration, Hydrogen-Ion,Concentrations, Hydrogen-Ion,Hydrogen Ion Concentration,Hydrogen-Ion Concentrations
D000255 Adenosine Triphosphate An adenine nucleotide containing three phosphate groups esterified to the sugar moiety. In addition to its crucial roles in metabolism adenosine triphosphate is a neurotransmitter. ATP,Adenosine Triphosphate, Calcium Salt,Adenosine Triphosphate, Chromium Salt,Adenosine Triphosphate, Magnesium Salt,Adenosine Triphosphate, Manganese Salt,Adenylpyrophosphate,CaATP,CrATP,Manganese Adenosine Triphosphate,MgATP,MnATP,ATP-MgCl2,Adenosine Triphosphate, Chromium Ammonium Salt,Adenosine Triphosphate, Magnesium Chloride,Atriphos,Chromium Adenosine Triphosphate,Cr(H2O)4 ATP,Magnesium Adenosine Triphosphate,Striadyne,ATP MgCl2
D048230 Corynebacterium glutamicum A species of gram-positive, asporogenous, non-pathogenic, soil bacteria that produces GLUTAMIC ACID.
D055503 Protein Multimerization The assembly of the QUATERNARY PROTEIN STRUCTURE of multimeric proteins (MULTIPROTEIN COMPLEXES) from their composite PROTEIN SUBUNITS. Protein Dimerization,Protein Heteromultimerizaton,Protein Multimer Assembly,Protein Trimerization,Assembly, Protein Multimer,Dimerization, Protein,Heteromultimerizaton, Protein,Heteromultimerizatons, Protein,Multimer Assembly, Protein,Multimerization, Protein,Trimerization, Protein
D019289 Pyruvic Acid An intermediate compound in the metabolism of carbohydrates, proteins, and fats. In thiamine deficiency, its oxidation is retarded and it accumulates in the tissues, especially in nervous structures. (From Stedman, 26th ed) Pyruvate,Acid, Pyruvic

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