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The SUMO E3 ligase RanBP2 promotes modification of the HDAC4 deacetylase

Abstract : Transcriptional repression mediated through histone deacetylation is a critical component of eukaryotic gene regulation. Here we demonstrate that the class II histone deacetylase HDAC4 is covalently modified by the ubiquitin-related SUMO-1 modifier. A sumoylation-deficient point mutant (HDAC4-K559R) shows a slightly impaired ability to repress transcription as well as reduced histone deacetylase activity. The ability of HDAC4 to self-aggregate is a prerequisite for proper sumoylation in vivo. Calcium/calmodulin-dependent protein kinase (CaMK) signalling, which induces nuclear export, abrogates SUMO-1 modification of HDAC4. Moreover, the modification depends on the presence of an intact nuclear localization signal and is catalysed by the nuclear pore complex (NPC) RanBP2 protein, a factor newly identified as a SUMO E3 ligase. These findings suggest that sumoylation of HDAC4 takes place at the NPC and is coupled to its nuclear import. Finally, modification experiments indicate that the MEF2-interacting transcription repressor (MITR) as well as HDAC1 and -6 are similarly SUMO modified, indicating that sumoylation may be an important regulatory mechanism for the control of transcriptional repression mediated by both class I and II HDACs.
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Submitted on : Wednesday, May 26, 2021 - 3:11:27 PM
Last modification on : Tuesday, October 19, 2021 - 10:29:32 PM

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Olivier Kirsh, Jacob-Sebastian Seeler, Andrea Pichler, Andreas Gast, Stefan Müller, et al.. The SUMO E3 ligase RanBP2 promotes modification of the HDAC4 deacetylase. EMBO Journal, EMBO Press, 2002, 21 (11), pp.2682-2691. ⟨10.1093/emboj/21.11.2682⟩. ⟨pasteur-03237088⟩

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