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The p65 subunit of NF-kappa B regulates I kappa B by two distinct mechanisms.

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Scott, M L, Fujita, T, Liou, H C, Nolan, G P, Baltimore, D·1993·Genes & Development

Abstract

Transcription factor NF-kappa B (p50/p65) is generally localized to the cytoplasm by its inhibitor I kappa B. Overproduced I kappa B, free from NF-kappa B, is rapidly degraded. Overexpression of p65 increases endogenous I kappa B protein in both carcinoma and lymphoid cells by two mechanisms: protein stabilization and increased transcription of I kappa B mRNA. In contrast, p65 delta, a naturally occurring splice variant, fails to markedly augment I kappa B protein levels. Both overexpressed p65 and coexpressed p50 are cytoplasmic, whereas p65 delta is partly nuclear, indicating that the I kappa B induced by p65 can maintain NF-kappa B in the cytoplasm. Thus, p65 and I kappa B are linked in an autoregulatory loop, ensuring that NF-kappa B is held in the cytoplasm until cells are specifically induced to translocate it to the nucleus.

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Authors
Scott, M. L., Fujita, T., Liou, H. C., Nolan, G. P., & Baltimore, D.
Venue
Genes & Development
Published
1993-07-01
Volume
7
Issue
7a
Pages
1266-1276
ISSN
0890-9369 (ISSN-L)
OpenAlex
W1981884734
Cited by
354
References
0
Type
posted content
Language
en
Open access
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