Abstract
The NADPH:O2 oxidoreductase (NADPH oxidase) of human neutrophils is converted from a dormant to an active state upon stimulation of the cells. We have studied the soluble fraction that is required for NADPH oxidase activation in a cell-free system. Human neutrophils were separated in a membrane-containing and a soluble fraction. The soluble fraction was separated on carboxymethyl (CM) Sepharose in 10 mM 4-morpholino-ethanesulfonic acid buffer of pH 6.8. Reconstitution of the NADPH oxidase activity, measured as O2 consumption, was only found when the membrane fraction was combined with the flowthrough of the CM Sepharose column as well as with a fraction that eluted at 125 mM NaCl. This result indicates that at least two soluble components are necessary for reconstitution of the NADPH oxidase activity: one that does not bind to CM Sepharose and one that does bind. These components were designated soluble oxidase component (SOC) I and SOC II, respectively. Boiling destroyed the activity in both fractions. In the soluble fraction of human lymphocytes and thrombocytes neither SOC I nor SOC II activity was found. SOC II copurified with a 47-kD phosphoprotein, previously found defective in patients with the autosomal form of chronic granulomatous disease (CGD). Inactive soluble fractions of cells from autosomal CGD patients were reconstituted with a SOC II fraction from control cells. The result of this experiment indicates that autosomal CGD patients are normal in SOC I but defective in SOC II.
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