The protein encoded by this gene is a cytosolic regulatory component of the superoxide-producing phagocyte NADPH-oxidase, a multicomponent enzyme system important for host defense. This protein is preferentially expressed in cells of myeloid lineage. It interacts primarily with neutrophil cytosolic factor 2 (NCF2/p67-phox) to form a complex with neutrophil cytosolic factor 1 (NCF1/p47-phox), which further interacts with the small G protein RAC1 and translocates to the membrane upon cell stimulation. This complex then activates flavocytochrome b, the membrane-integrated catalytic core of the enzyme system. The PX domain of this protein can bind phospholipid products of the PI(3) kinase, which suggests its role in PI(3) kinase-mediated signaling events. The phosphorylation of this protein was found to negatively regulate the enzyme activity. Alternatively spliced transcript variants encoding distinct isoforms have been observed.
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Protein Aliases: CTA-833B7.1; MGC3810; NCF; NCF-4; NCF4; Neutrophil cytosol factor 4; neutrophil cytosolic factor 4 (40kD); neutrophil cytosolic factor 4, 40kDa; Neutrophil NADPH oxidase factor 4; OTTHUMP00000028736; OTTHUMP00000043756; p40-phox; P40PHOX; SH3 and PX domain-containing protein 4; SH3PXD4
Gene Aliases: CGD3; NCF; NCF4; P40PHOX; SH3PXD4
UniProt ID: (Human) Q15080
Entrez Gene ID: (Human) 4689