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Glutamate Dehydrogenase (NAD(P))

from E.coli overproducer, lyophilizate

For further processing only.

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Glutamate Dehydrogenase (NAD(P)) material number and pack size:
Material Number Pack Size
11745727103 custom fill
Will be supplied as "GlDH, Lyo., rec.". Unit of measure is "MU".
Recombinant glutamate dehydrogenase.
Use recombinant Glutamate Dehydrogenase in diagnostic tests for the determination of ammonia, urea, L-glutamate, glutamate pyruvate transaminase and leucine aminopeptidase.
Nomenclature: L-glutamate:NAD(P)+ oxidoreductase (deaminating)
Molecular weight: ~2 200 kD for the associated enzyme with 8 subunits; 280 kD for one subunit.
Michaelis constants (Tris buffer, pH 8.0, +23°C):
L-glutamate: 1.8 x 10-3 mol/L
NADP: 4.7 x 10-5 mol/L
α-ketoglutarate: 7.0 x 10-4 mol/L
NH4+: 3.2 x 10-3 mol/L
NADPH: 2.6 x 10-5 mol/L
Km values for NAD or NADH are difficult to obtain due to their inhibitory action.
Inhibitors: 4-chloromercuribenzoate, Na2S, diethyldithiocarbamate, 1,10-phenanthroline,
8-hydroxyquinoline, NaN3, thyroxine, heparin, sulfonylcarbamides, Cu2+, Hg2+, Ag2+, Fe3+, Zn2+, K+, PO42-, NO3-
Activators: Thioglycolic acid, b-mercaptoethylamine, EDTA, α, α'-dipyridyl
pH optimum: 8.0 (see figure for product Cat. No. 10 190 462 103)
Temperature dependence: See figure for product Cat. No. 10 190 462 103
pH stability: 5.5-6.5 (see figure for product Cat. No. 10 190 462 103)
Thermal stability: Up to +60°C (see figure for product Cat. No. 10 190 462 103)
Specificity: The oxidation of L-glutamate is stimulated by ADP and inhibited by GTP. In contrast, the oxidation of alanine, leucine, isoleucine, methionine, valine, norleucine, norvaline and 2-aminobutyrates is stimulated by GTP and inhibited by ADP.
Appearance: White lyophilizate
Solubility: Clear, colorless solution in water (c=20 mg/mL)
pH value (c=20 mg/L in water): 6.5-7.5
Activity (+25°C, α-ketoglutarat): ≥80 U/mg lyophilizate
Contaminants (expressed as percentage of Glutamate Dehydrogenase activity):
Alcohol dehydrogenase: ≤0.005
Lactate dehydrogenase: ≤0.005
Malate dehydrogenase: ≤0.005
''NADH-Oxidase'': ≤0.005
NH4: ≤0.05 μg/mg lyophilizate
Stability: At +2 to +8°C within specification range for 12 months. Store dry.