A Core Chromatin Remodeling Factor Instructs Global Chromatin Signaling through Multivalent Reading of Nucleosome Codes

Sujit S. Nair, Da Qiang Li, Rakesh Kumar

Research output: Contribution to journalArticlepeer-review

65 Scopus citations

Abstract

ATP-dependent NuRD repressor complexes involve combinatorial assembly of its subunits. However, the mechanism of gene transcription by MTA1/NuRD remains enigmatic. Here we report that MTA1 methylation by G9a methytransferase and demethylation by LSD1 determines the nucleosome remodeling and transcriptional outcome. Contrary to the current static repressor model of the NuRD complex, we discovered that MTA1 association with nucleosomes and corepressor/coactivator complexes is dynamic. While methylated MTA1 is required for the NuRD repressor complex, demethylated MTA1 recognizes the bivalent histone H3K4-AcK9 mark and recruits coactivator NURF-trithorax remodeling complex in a signaling-dependent manner. MTA1's lysine 532 methylation represents a molecular switch as methylated and demethylated MTA1 nucleate NuRD or NURF complexes with opposite functions in a cyclical manner. In addition, MTA1 possesses an inherent histone amplifier activity with an instructive role in impacting the epigenetic landscape, providing a new perspective to the molecular governance of dual coregulator functions of a master coregulator.

Original languageEnglish
Pages (from-to)704-718
Number of pages15
JournalMolecular Cell
Volume49
Issue number4
DOIs
StatePublished - 21 Feb 2013
Externally publishedYes

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