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Mol. Cell. Biol., Oct 1996, 5444-5449, Vol 16, No. 10
H Suyang, R Phillips, I Douglas and S Ghosh
Stimulation with inducers that cause persistent activation of NF-kappa B
results in the degradation of the NF-kappa B inhibitors, I kappa B alpha
and I kappa B beta. Despite the rapid resynthesis and accumulation of I
kappa B alpha, NF-kappa B remains induced under these conditions. We now
report that I kappa B beta is also resynthesized in stimulated cells and
appears as an unphosphorylated protein. The unphosphorylated I kappa B beta
forms a stable complex with NF-kappa B in the cytosol; however, this
binding fails to mask the nuclear localization signal and DNA binding
domain on NF-kappa B, and the I kappa B beta-NF-kappa B complex enters the
nucleus. It appears therefore that during prolonged stimulation, I kappa B
beta functions as a chaperone for NF-kappa B by protecting it from I kappa
B alpha and allowing it to be transported to the nucleus.
Copyright © 1996, American Society for Microbiology
Role of unphosphorylated, newly synthesized I kappa B beta in persistent activation of NF-kappa B
Section of Immunobiology, Howard Hughes Medical Institute, Yale University School of Medicine, New Haven, Connecticut, USA.
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