Inhibitory Subunit Of NF Kappa B Beta (IkBb)
TRIP9; NFKBIB; Nuclear Factor Of Kappa Light Polypeptide Gene Enhancer In B-Cells Inhibitor,Beta; NF-Kappa-B Inhibitor Beta
NFKB1 or NFKB2 is bound to REL, RELA, or RELB to form the NFKB complex. The NFKB complex is inhibited by I-kappa-B proteins (NFKBIA or NFKBIB
), which inactivate NF-kappa-B by trapping it in the cytoplasm.
Phosphorylation of serine residues on the I-kappa-B proteins by kinases (IKBKA or IKBKB) marks them for destruction via the ubiquitination pathway, thereby allowing activation of the NF-kappa-B complex. Activated NFKB complex translocates into the nucleus and binds DNA at kappa-B-binding motifs such as 5-prime GGGRNNYYCC 3-prime or 5-prime HGGARNYYCC 3-prime (where H is A, C, or T; R is an A or G purine; and Y is a C or T pyrimidine).