Inhibitor of KappaB
The transcriptional factor NF-κB – a key regulator of cellular events such as cell growth, immune response, and cell survival – was first identified by Dr. David Baltimore’s group (Sen and Baltimore 1986). Inhibitor of kappaB (IκB) can form a complex with NF-κB and control these events. IκB family proteins harbor an ankyrin (ANK) repeat domain, a core motif of NF-κB binding, which was first identified in the cell-cycle gene sequences of yeast and Drosophila in 1987 (Breeden and Nasmyth 1987). IκB family members have been found to have conserved ANK repeat domains, including β-strand and α-helix repeat sequences. On the basis of extensive studies, nine IκB family proteins harboring ANK repeats have been identified, and these IκB...
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