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CAS Number: 9029-11-2
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)pH optimum
Temperature dependence: See figureTemperature dependence
pH stability: 5.5-6.5 (see figure)pH stability
Thermal stability: Up to +60°C (see figure)Thermal stability
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.
Remarks: GIDH suspension or solution can be dialyzed against phosphate buffer, 10 mmol/L. GIDH molecules have the tendency to associate in some test formulations, modified GIDH minimizes this effect.", "Language": "en", "Country": "XG", "Code": "Properties" }, { "Name": "Specification", "Value": "Appearance: Clear, colourless solution in glycerol
pH value: 7.0-7.8
Specific Activity: ≥120 U/mg
Protein (Biuret): 30±3 mg/mL
Contaminants (expressed as percentage of Glutamate Dehydrogenase activity):
Alcohol dehydrogenase: ≤0.01
Lactate dehydrogenase: ≤0.01
Malate dehydrogenase: ≤0.01
NH4: ≤0.16 μg/mg protein
Glycerol: 560-680 mg/mL (45-55% (v/v))
EDTA (complexometric): 12.2-13.4 mmol/L
pH 5.5 treatment (30 minutes): Corresponds to specification
Stability: At +2 to +8°C within specification range for 18 months.", "Language": "en", "Country": "XG", "Code": "Specification" } ] } } ] }

Glutamate Dehydrogenase (NAD(P))

from beef liver, solution


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