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• W1974178581 abstract "The transcription factor NF-kappa B is retained in the cytoplasm by its inhibitor I kappa B-alpha. Upon cellular stimulation with a variety of pathogen- or stress-related agents, I kappa B-alpha is functionally inactivated and NF-kappa B translocates to the nucleus to trigger transcription of a large array of genes, many of which encode proteins critical for immune or stress responses. Here, we demonstrate that signal-induced proteolysis of I kappa B-alpha is an obligatory step for activation of NF-kappa B: calpain inhibitors I and II, which inhibit cysteine proteases, block activation of NF-kappa B by blocking degradation of I kappa B-alpha without affecting signal-induced phosphorylation of this inhibitor. This contrasts with previous models in which phosphorylation of I kappa B-alpha was postulated to be sufficient for activation. We demonstrate further that signal-induced phosphorylation of I kappa B-alpha does not by itself lead to dissociation of the inhibitor from NF-kappa B, providing a rationale for and confirmation of the need to proteolyze I kappa B-alpha in order to activate NF-kappa B. Signal-controlled, target-specific proteolysis is an unexpected, yet likely more general, mechanism for regulating transcription factors." @default.
• W1974178581 created "2016-06-24" @default.
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• W1974178581 date "1995-01-17" @default.
• W1974178581 modified "2023-10-16" @default.
• W1974178581 title "Activation of NF-kappa B requires proteolysis of the inhibitor I kappa B-alpha: signal-induced phosphorylation of I kappa B-alpha alone does not release active NF-kappa B." @default.
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• W1974178581 doi "https://doi.org/10.1073/pnas.92.2.552" @default.
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