The phagocyte NADPH oxidase NOX2 was the first NOX family member to be discovered. It is responsible for the production of reactive oxygen species that are required for bacterial killing and host defense. Activated NOX2 is an enzymatic complex composed of two membrane proteins, p22 and gp91 (renamed NOX2), which form the cytochrome b, and four cytosolic proteins, p47, p67, p40, and the small GTPase Rac2. Except for Rac2, all proteins from the complex become phosphorylated during neutrophil activation, suggesting the importance of this process in NOX2 regulation. The phosphorylation of the cytosolic components, and in particular p47phox, has been extensively studied; however, the phosphorylation of the membrane proteins was less studied, in part due to the lack of good antibodies and accurate membrane solubilization techniques. In this chapter, we describe a method we have used to study NOX2 phosphorylation, which is based on the labeling of the intracellular ATP pool with P prior to applying a stimulus inducing protein phosphorylation. We also describe the solubilization of membrane-bound gp91/NOX2 and analysis by immunoprecipitation, polyacrylamide gel electrophoresis, electrophoretic transfer, phosphoamino acid analysis, and autoradiography. This protocol can also be used to study the possible phosphorylation of other NOX family members.
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