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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Purification of the solubilized NADPH:O2 oxidoreductase of human neutrophils. Isolation of its catalytically inactive cytochrome b and flavoprotein redox centers.

The membrane-bound NADPH:O2 oxidoreductase of human neutrophils has been solubilized in approximately 70% yield and purified on concanavalin A-Sepharose and gel sieving columns of varying bed volumes and sieving ranges. The half-life of the solubilized oxidoreductase stored at 2-4 degrees C in the presence of 25% glycerol at pH 8.6 is approximately 30 h. The oxidoreductase contains a flavoprotein identifiable by its fluorescence spectrum for FAD which binds weakly to concanavalin A-Sepharose and elutes from gel sieving columns at a molecular weight range of approximately 51,000. This flavoprotein accounts for approximately 70% of the total FAD content found in granular membrane fractions recovered from activated neutrophils. Recovery of oxidoreductase activity from both concanavalin A-Sepharose affinity and gel sieving columns is affected by the resolution of the flavoprotein free of the cytochrome b component of the oxidoreductase. The resolved flavoprotein and cytochrome b appear unable to catalyze either NADH nor NADPH oxidase activities with O2, ferricyanide, or nitroblue tetrazolium salt serving as electron acceptors.[1]


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