What is Glucose Dehydrogenase from Pseudomonas sp?

Glucose dehydrogenase is an NAD(P)-dependent enzyme obtained from the genus Pseudomonas, which is stable to heat up to 50° C. and permits use of both NAD and NADP as a coenzyme, and is useful as an enzyme for clinical use.
The enzyme has activity at a temperature of from about 30.degree. C. to about 65.degree. C. at a pH of from about pH 6 to about pH 10 and has an optimum activity at a temperature from about 50.degree. C. to about 60.degree. C. at a pH of from about 8.5 to about 9.0. The enzyme is further characterized by retaining at least 90% residual activity after treatment at 50.degree. C. for 15 minutes, being NAD or NADP dependent, having a molecular weight of about 101,000 daltons as determined by gel filtration using TSK gel, having an isoelectric point of about 4.5 by ampholyte isoelectric focusing, and having a specificity for at least .beta.-D-glucose and 2-deoxyglucose.
In enzymology, a glucose 1-dehydrogenase (EC 1.1.1.47) is an enzyme that catalyzes the chemical reaction
beta-D-glucose + NAD(P)+ \rightleftharpoons D-glucono-1,5-lactone + NAD(P)H + H+
The 3 substrates of this enzyme are beta-D-glucose, NAD+, and NADP+, whereas its 4 products are D-glucono-1,5-lactone, NADH, NADPH, and H+.
Glucose Dehydrogenase from Pseudomonas sp belongs to the family of oxidoreductases, specifically those acting on the CH-OH group of donor with NAD+ or NADP+ as acceptor. The systematic name of this enzyme class is beta-D-glucose:NAD(P)+ 1-oxidoreductase. Other names in common use include D-glucose dehydrogenase (NAD(P)+), and hexose phosphate dehydrogenase. This enzyme participates in pentose phosphate pathway.
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