Oxidation of 1,5-anhydro-D-glucitol to 1,5-anhydro-D-fructose catalyzed by an enzyme from bacterial membranes.
Bacteria which grow on 1,5-anhydro-D-glucitol (AG) were isolated from soil. One such strain showing the highest AG-assimilating activity was further characterized and identified as a new strain of the Pseudomonas family (named Pseudomonas sp. NK-85001). A subcellular membranous fraction obtained from this strain catalyzed the oxidation of AG to 1,5-anhydro-D-fructose. This oxidation reaction consumed molecular oxygen as the terminal electron acceptor. The AG-oxidizing activity was further purified after solubilization. The AG oxidation catalyzed by this solubilized enzyme utilized molecular oxygen only in the presence of an electron mediator such as 2,6-dichlorophenolindophenol or phenazine methosulfate. Thus, the enzyme was suggested to be a dehydrogenase rather than an oxidase. The solubilized enzyme preparation also showed a strict substrate specificity. The observed specificity indicated that application of the enzyme for AG assay in clinical samples might be possible.
Nakamura
T
T
Naito
A
A
Takahashi
Y
Y
Akanuma
H
H
D002462:Cell Membrane / Q000201:enzymology; D055598:Chemical Phenomena; D002621:Chemistry; D003837:Deoxy Sugars / Q000378:metabolism*; D003847:Deoxyglucose / Q000378:metabolism*; D005632:Fructose / Q000031:analogs & derivatives* / Q000378:metabolism; D009682:Magnetic Resonance Spectroscopy; D010084:Oxidation-Reduction; D010088:Oxidoreductases / Q000302:isolation & purification*; D011549:Pseudomonas / Q000378:metabolism*; D013379:Substrate Specificity
D003837:Deoxy Sugars; D005632:Fructose; C006584:1,5-anhydroglucitol; C048927:1,5-anhydrofructose; D003847:Deoxyglucose; D010088:Oxidoreductases