cis-Acting Element-specific Transcriptional Activity of Differentially Phosphorylated Nuclear Factor-κB*

J. Anrather,Gianfranco Racchumi,C. Iadecola

Published 2005 in Journal of Biological Chemistry

ABSTRACT

Phosphorylation of nuclear factor-κB (NF-κB) subunits emerges as a mechanism by which transcriptional activity of nuclear NF-κB complexes is regulated in an inhibitor κB-independent fashion. As the main transactivator, the p65 subunit of NF-κB has an outstanding position in the hierarchy of NF-κB proteins. p65 is a multiply phosphorylated protein with phosphorylation sites in the C-terminal transactivation domain and the N-terminal Rel homology domain (RHD). In this study, we describe two previously non-reported phospho-acceptor sites within the p65 RHD. We show that differential phosphorylation of serine residues within the RHD modulates transcriptional activity in a cis-acting element and promoter-specific context, thus leading to a phosphorylation state-dependent gene expression profile. RelA-/- mouse embryonic fibroblasts reconstituted with wild-type p65 or p65 phosphorylation-deficient mutants showed a distinctive expression profile of synthetic κB-dependent reporters as well as endogenous genes. Hypophosphorylated p65 did not display cis-acting element-specific changes in DNA binding or dimerization behavior. This study shows for the first time that site-specific phosphorylation can target a transcription factor to a particular subset of genes.

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