P40 Phox (NCF4) Antibody – Rabbit Polyclonal

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. [provided by RefSeq]

p40phox: a component of the NADPH-oxidase, a multicomponent enzyme system responsible for the oxidative burst. Upon neutrophil stimulation, this protein and other cytosolic elements are sent to the cell membrane from the cytosol to form a complex which produces phagocytic oxygen radicals. Responsible for the downregulation of NADPH-oxidase. Alternative splicing has been observed.

Protein type: Oxidoreductase

Chromosomal Location of Human Ortholog: 22q13.1

Cellular Component: membrane; endosome membrane; cytosol; NADPH oxidase complex

Molecular Function: protein dimerization activity; protein binding; superoxide-generating NADPH oxidase activator activity; phosphatidylinositol 3-phosphate binding

Biological Process: positive regulation of catalytic activity; interaction with host; antigen processing and presentation of peptide antigen via MHC class I; antigen processing and presentation of exogenous peptide antigen via MHC class I, TAP-dependent; antigen processing and presentation of exogenous peptide antigen via MHC class I; immune response; vascular endothelial growth factor receptor signaling pathway

Disease: Granulomatous Disease, Chronic, Autosomal Recessive, Cytochrome B-positive, Type Iii