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. 1990 Jan 1;265(1):95–100. doi: 10.1042/bj2650095

Purification and some properties of the 45 kDa diphenylene iodonium-binding flavoprotein of neutrophil NADPH oxidase.

C M Yea 1, A R Cross 1, O T Jones 1
PMCID: PMC1136618  PMID: 2154184

Abstract

The 45 kDa diphenylene iodonium-binding flavoprotein of the human neutrophil superoxide-generating oxidase has been purified by affinity chromatography. The polypeptide was eluted from Blue Memsep or 2',5'-ADP-agarose columns with either NADP or low concentrations of the specific inhibitor diphenylene iodonium. The purified protein was shown to bind FAD at a ratio of 1.09 mol of FAD/mol of protein. The reconstituted flavoprotein had a fluorescence spectrum similar, but not identical, to that of free FAD. It had an isoelectric point of approx. 4.0. The reconstituted flavoprotein displayed no diaphorase activity towards a range of artificial electron acceptors. Polyclonal antibodies raised against the pure protein inhibited superoxide generation by solubilized oxidase in a dose-dependent manner, and inhibited superoxide generation when incubated with either cytosol or membrane fractions in a reconstituted system. These antibodies precipitated the 45 kDa polypeptide together with a haem-containing 23 kDa protein thought to be the small subunit of cytochrome b-245. Antibodies raised against cytochrome P-450 reductase also precipitated these two polypeptides. These results are consistent with the 45 kDa polypeptide being the flavoprotein of the neutrophil superoxide-generating oxidase.

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Selected References

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