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pH value: 6.0-7.0
Activity (+25°C, glucose-6-P): ≥2,500 U/mL
Activity (+30°C): ≥3,000 U/mL
Contaminants (expressed as percentage of Glucose-6-phosphate Dehydrogenase activity):
ATPase: ≤0.0200
Creatine kinase: ≤0.001
Glutamate dehydrogenase: ≤0.01
Glutathione reductase: ≤0.001
Hexokinase and GIucose dehydrogenase: ≤0.05
Myokinase: ≤0.01
''NADH oxidase'': ≤0.02
''NADPH oxidase'': ≤0.0005
Phosphoglucomutase: ≤0.001
6-Phosphogluconate dehydrogenase (NAD): ≤0.001
6-Phosphogluconate dehydrogenase (NADP): ≤0.001
Phophoglucose isomerase : ≤0.01
Glycerol (enzymatic): 45-55% (v/v)
Stability: At +2 to +8°C within specification range for 12 months.", "Language": "en", "Country": "XG", "Code": "Specification" }, { "Name": "Properties", "Value": "Nomenclature: D-glucose-6-phosphate:NAD(P)+ 1-oxidoreductase
CAS Number: 9001-40-5
Molecular weight: 110 kD (1) (2 identical subunits 55,000 D)
Isoelectric point: pH 4.6
Michaelis constants (Tris: 0.1 mol/l; pH 7.8, +25°C):
NAD: 1.4 x 10-4 mmol/L
NADP: 3.7 x 10-5 mmol/L
Glucose-6-P: 3.7 x 10-4 mmol/L (NAD as coenzyme)
Glucose-6-P: 2.0 x 10-4 mmol/L (NAD as coenzyme)
Activators/inhibitors:
Phosphate, 5 mmol/L: 100% (NAD), 80% (NADP)
Phosphate, 50 mmol/L: 100% (NAD), 80% (NADP)
Without Mg2+: 90% (NAD), 80% (NADP)
Mg2+, 3 mmol/L: 100% (NAD), 100% (NADP)
Mg2+, 30 mmol/L: 100% (NAD), 100% (NADP)
HCO3-, 3 mmol/L: 100% (NAD), 100% (NADP)
Inhibitors: NADPH is a competitive inhibitor in the NAD-dependent reaction. Unlike the yeast enzyme, myristic acid, dehydroepiandrosterone and palmitoyl CoA do not inhibit.
pH optimum: 7.8 (see figure)pH optimum
Temperature dependence: See figureTemperature dependence
pH stability: 5.0-10.0 (see figure)pH stability
Thermal stability: Up to +40°C for native G6P-DH, up to +50°C for modified G6P-DH (see figure)Thermal stability
Buffer stability: Temperature stability can be significantly improved by the increase of ionic strength (see figure).Buffer stability
Stability of the lyophilizate: 100% residual activity after 3 weeks at +35°C
Specificity: G6P-DH is highly specific for glucose-6-phosphate and does not react with fructose-6-P, fructose-1,6-P2 or glucose-1P. 2-Deoxyglucose-6-P is slowly oxidized with NAD (5%) and with NADP (4%).", "Language": "en", "Country": "XG", "Code": "Properties" } ] } } ] }

Glucose-6-Phosphate Dehydrogenase (G6P-DH)

from Leuconostoc mesenteroides, expressed in E. coli, solution

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