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Bs: alternative regulation of NF-B activityInstitute of Experimental Internal Medicine, Otto-von-Guericke University, Magdeburg, Germany
1Correspondence: Institute of Experimental Internal Medicine, Otto-von-Guericke University, Medical Faculty, Leipziger Strasse 44, 39120 Magdeburg, Germany. E-mail: docmn{at}web.de
The transcription factor nuclear factor-kappa B (NF-
B) is a crucial regulator of many physiological and patho-physiological processes, including control of the adaptive and innate immune responses, inflammation, proliferation, tumorigenesis, and apoptosis. Thus, the tight regulation of NF-B activity within a cell is extremely important. The central mechanism of NF-B regulation is the signal-induced proteolytic degradation of a family of cytoplasmic inhibitors of NF-B, the IBs. However, with the discovery of an IB-independent noncanonical or "alternative" pathway of NF-B activation, the importance of other regulatory mechanisms responsible for the fine-tuning of NF-B became clear. Post-translational modification, especially phosphorylation, of the Rel proteins, of which dimeric NF-B is composed, are such alternative regulatory mechanisms. The best analyzed example is RelA phosphorylation, which takes place at specific amino acids resulting in distinct functional changes of this gene regulatory protein. The interaction of NF-B with other proteins such as glucocorticoid receptors is very important for the regulation of NF-B activity. Recently, exciting new concepts of IB-independent NF-B control like dimer exchange and nucleolar sequestration of RelA have been described, indicating that many aspects of NF-B control are waiting to be discovered.—Neumann, M., Naumann, M. Beyond IBs: alternative regulation of NF-B activity.
Key Words: RelA phosphorylation • RelA acetylation • GR/NF-B cross-talk • nucleolar sequestration • dimer exchange
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