cofactor:FAD. ,Disease:Defects in CYBB are a cause of chronic granulomatous disease X-linked (XCGD) [MIM:306400]. Chronic granulomatous disease is a genetically heterogeneous disorder characterized by the inability of neutrophils and phagocytes to kill microbes that they have ingested. Patients suffer from life-threatening bacterial/fungal infections. ,Function:Critical component of the membrane-bound oxidase of phagocytes that generates superoxide. It is the terminal component of a respiratory chain that transfers single electrons from cytoplasmic NADPH across the plasma membrane to molecular oxygen on the exterior. Also functions as a voltage-gated proton channel that mediates the H (+) currents of resting phagocytes. It participates in the regulation of cellular pH and is blocked by zinc. ,online information:CYBB deficiency database ,PTM:Glycosylated. ,similarity:Contains 1 FAD-binding FR-type domain. ,similarity:Contains 1 ferric oxidoreductase domain. ,subunit:Composed of a heavy chain (beta) and a light chain (alpha) . ,
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