Reversible acetylation of the chromatin remodelling complex NoRC is required for non-coding RNA-dependent silencing.

Abstract:

:The SNF2h (sucrose non-fermenting protein 2 homologue)-containing chromatin-remodelling complex NoRC silences a fraction of ribosomal RNA genes (rDNA) by establishing a heterochromatic structure at the rDNA promoter. Here we show that the acetyltransferase MOF (males absent on the first) acetylates TIP5, the largest subunit of NoRC, at a single lysine residue, K633, adjacent to the TIP5 RNA-binding domain, and that the NAD(+)-dependent deacetylase SIRT1 (sirtuin-1) removes the acetyl group from K633. Acetylation regulates the interaction of NoRC with promoter-associated RNA (pRNA), which in turn affects heterochromatin formation, nucleosome positioning and rDNA silencing. Significantly, NoRC acetylation is responsive to the intracellular energy status and fluctuates during S phase. Activation of SIRT1 on glucose deprivation leads to deacetylation of K633, enhanced pRNA binding and an increase in heterochromatic histone marks. These results suggest a mechanism that links the epigenetic state of rDNA to cell metabolism and reveal another layer of epigenetic control that involves post-translational modification of a chromatin remodelling complex.

journal_name

Nat Cell Biol

journal_title

Nature cell biology

authors

Zhou Y,Schmitz KM,Mayer C,Yuan X,Akhtar A,Grummt I

doi

10.1038/ncb1914

subject

Has Abstract

pub_date

2009-08-01 00:00:00

pages

1010-6

issue

8

eissn

1465-7392

issn

1476-4679

pii

ncb1914

journal_volume

11

pub_type

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