I kappa B-alpha is a 40 kDa protein that functions to inhibit NF- kappaB activity. The inhibition occurs via protein-protein interaction between I kappaB proteins and NF- kappaB dimers in the cytosol. The interaction of I kappa B-alpha with NF- kappaB masks the nuclear localization sequence of NF- kappaB, preventing NF- kappaB translocation to the nucleus. A variety of stimuli can activate gene expression by liberating NF- kappaB through the degradation of I kappaB alpha. These stimuli include the proinflammatory cytokines TNF- alpha and IL-1 beta, chemokines, PMA, growth factors, LPS, UV irradiation, viral infection, as well as various chemical and physical stresses. In humans, the gene is located on the q arm of chromosome 14.
I(Kappa)B(alpha); I-kappa-B-alpha; I-kappaBalpha; IkappaBalpha; IkB-alpha; IKBA; Inhibitor of nuclear factor of kappa light chain gene enhancer in B-cells alpha; Inhibitor of nuclear factor of kappa light chain gene enhancer in B-cells, alpha; MAD-3; Major histocompatibility complex enhancer-binding protein MAD3; NF-kappa-B inhibitor alpha; NFKBI; nuclear factor of kappa light chain gene enhancer in B-cells; nuclear factor of kappa light chain gene enhancer in B-cells inhibitor, alpha; nuclear factor of kappa light polyp gene enhancer in B-cell 1; nuclear factor of kappa light polypeptide gene enhancer in B-cells inhibitor, alpha; RL/IF-1
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