cytochrome b-245 alpha chain
עודכן לאחרונה 18 Aug 2020
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ה CYBA gene provides instructions for making a protein called the cytochrome b-245 alpha chain (also known as p22-phox). This protein is one part (subunit) of a group of proteins that forms an enzyme complex called NADPH oxidase, which plays an essential role in the immune system. Within this complex, the cytochrome b-245 alpha chain has a beta chain partner (produced from the CYBB gene). Both alpha and beta chains are required for either to function, and the NADPH oxidase complex requires both chains in order to be functional. NADPH oxidase is primarily active in immune system cells called phagocytes. These cells catch and destroy foreign invaders such as bacteria and fungi. NADPH oxidase is also thought to regulate the activity of immune cells called neutrophils. These cells play a role in adjusting the inflammatory response to optimize healing and reduce injury to the body.
Normal function
ה CYBA gene provides instructions for making a protein called the cytochrome b-245 alpha chain (also known as p22-phox). This protein is one part (subunit) of a group of proteins that forms an enzyme complex called NADPH oxidase, which plays an essential role in the immune system. Within this complex, the cytochrome b-245 alpha chain has a beta chain partner (produced from the CYBB gene). Both alpha and beta chains are required for either to function, and the NADPH oxidase complex requires both chains in order to be functional. NADPH oxidase is primarily active in immune system cells called phagocytes. These cells catch and destroy foreign invaders such as bacteria and fungi. NADPH oxidase is also thought to regulate the activity of immune cells called neutrophils. These cells play a role in adjusting the inflammatory response to optimize healing and reduce injury to the body.
The presence of foreign invaders stimulates phagocytes and triggers the assembly of NADPH oxidase. This enzyme participates in a chemical reaction that converts oxygen to a toxic molecule called superoxide. Superoxide is used to generate several other compounds, including hydrogen peroxide (a strong disinfectant) and hypochlorous acid (the active ingredient in bleach). These highly reactive, toxic substances are known as reactive oxygen species. Phagocytes use these substances to kill foreign invaders, preventing them from reproducing in the body and causing illness.
Conditions referring to this gene or chromosome
Other names
CY24A_HUMAN
cytochrome b light chain
cytochrome b(558) alpha chain
cytochrome b, alpha polypeptide
cytochrome b-245 light chain
cytochrome b-245, alpha polypeptide
cytochrome b558 subunit alpha
flavocytochrome b-558 alpha polypeptide
neutrophil cytochrome b 22 kDa polypeptide
p22phox
superoxide-generating NADPH oxidase light chain subunit
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קריאה נוספת והפניות
- cytochrome b-245 alpha chain; MedlinePlus, National Library of Medicine.
- Kannengiesser C, Gerard B, El Benna J, Henri D, Kroviarski Y, Chollet-Martin S, Gougerot-Pocidalo MA, Elbim C, Grandchamp B. Molecular epidemiology of chronic granulomatous disease in a series of 80 kindreds: identification of 31 novel mutations. Hum Mutat. 2008 Sep;29(9):E132-49. doi: 10.1002/humu.20820.
- Roos D, Kuhns DB, Maddalena A, Bustamante J, Kannengiesser C, de Boer M, van Leeuwen K, Koker MY, Wolach B, Roesler J, Malech HL, Holland SM, Gallin JI, Stasia MJ. Hematologically important mutations: the autosomal recessive forms of chronic granulomatous disease (second update). Blood Cells Mol Dis. 2010 Apr 15;44(4):291-9. doi: 10.1016/j.bcmd.2010.01.009. Epub 2010 Feb 18.
- Stasia MJ, Li XJ. Genetics and immunopathology of chronic granulomatous disease. Semin Immunopathol. 2008 Jul;30(3):209-35. doi: 10.1007/s00281-008-0121-8. Epub 2008 May 29.
- Sumimoto H. Structure, regulation and evolution of Nox-family NADPH oxidases that produce reactive oxygen species. FEBS J. 2008 Jul;275(13):3249-77. doi: 10.1111/j.1742-4658.2008.06488.x. Epub 2008 May 30.
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