MafG sumoylation is required for active transcriptional repression.
A straightforward mechanism for eliciting transcriptional repression would be to simply block the DNA binding site for activators. Such passive repression is often mediated by transcription factors that lack an intrinsic repressor activity. MafG is a bidirectional regulator of transcription, a repressor in its homodimeric state but an activator when heterodimerized with p45. Here, we report that MafG is conjugated to SUMO-2/3 in vivo. To clarify the possible physiological role(s) for sumoylation in regulating MafG activity, we evaluated mutant and wild-type MafG in transgenic mice and cultured cells. Whereas sumoylation-deficient MafG activated p45-dependent transcription normally and did not affect heterodimer activity, repression by the sumoylation-deficient MafG mutant was severely compromised in vivo. Furthermore, the SUMO-dependent repression activity of MafG was sensitive to histone deacetylase inhibition. Thus, repression by MafG is not achieved through simple passive repression by competing for the activator binding site but requires sumoylation, which then mediates transcriptional repression through recruitment of a repressor complex containing histone deacetylase activity.
Pubmed ID: 16738329 RIS Download
Amino Acid Sequence | Animals | Base Sequence | Binding Sites | Bone Marrow Cells | Cell Line | DNA Probes | Dimerization | Histone Deacetylases | Humans | Lysine | MafG Transcription Factor | MafK Transcription Factor | Megakaryocytes | Mice | Mice, Knockout | Mice, Transgenic | Models, Biological | Molecular Sequence Data | Protein Inhibitors of Activated STAT | Protein Structure, Quaternary | Recombinant Proteins | Repressor Proteins | Sequence Homology, Amino Acid | Small Ubiquitin-Related Modifier Proteins | Transcriptional Activation