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Updated: Sep 23, 2026

Assays for Validating Histone Acetyltransferase Inhibitors
Published on: August 6, 2020
JNK phosphorylation relieves HDAC3-dependent suppression of the transcriptional activity of c-Jun
Carsten Weiss1, Sandra Schneider, Erwin F Wagner
1Department of Biomedical Genetics, University of Rochester, Rochester, NY 14642, USA. weissca@uni-mainz.de
Abstract:
The AP-1 transcription factor c-Jun is a prototypical nuclear effector of the JNK signal transduction pathway. The integrity of JNK phosphorylation sites at serines 63/73 and at threonines 91/93 in c-Jun is essential for signal-dependent target gene activation. We show that c-Jun phosphorylation mediates dissociation of an inhibitory complex, which is associated with histone deacetylase 3 (HDAC3). The subsequent events that ultimately cause increased mRNA synthesis are independent of c-Jun phosphorylation and its interaction with JNK. These findings provide an 'activation by de-repression' model as an explanation for the stimulatory function of JNK on c-Jun.
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