Histone methylation by PRC2 is inhibited by active chromatin marks.

Abstract:

:The Polycomb repressive complex 2 (PRC2) confers transcriptional repression through histone H3 lysine 27 trimethylation (H3K27me3). Here, we examined how PRC2 is modulated by histone modifications associated with transcriptionally active chromatin. We provide the molecular basis of histone H3 N terminus recognition by the PRC2 Nurf55-Su(z)12 submodule. Binding of H3 is lost if lysine 4 in H3 is trimethylated. We find that H3K4me3 inhibits PRC2 activity in an allosteric fashion assisted by the Su(z)12 C terminus. In addition to H3K4me3, PRC2 is inhibited by H3K36me2/3 (i.e., both H3K36me2 and H3K36me3). Direct PRC2 inhibition by H3K4me3 and H3K36me2/3 active marks is conserved in humans, mouse, and fly, rendering transcriptionally active chromatin refractory to PRC2 H3K27 trimethylation. While inhibition is present in plant PRC2, it can be modulated through exchange of the Su(z)12 subunit. Inhibition by active chromatin marks, coupled to stimulation by transcriptionally repressive H3K27me3, enables PRC2 to autonomously template repressive H3K27me3 without overwriting active chromatin domains.

journal_name

Mol Cell

journal_title

Molecular cell

authors

Schmitges FW,Prusty AB,Faty M,Stützer A,Lingaraju GM,Aiwazian J,Sack R,Hess D,Li L,Zhou S,Bunker RD,Wirth U,Bouwmeester T,Bauer A,Ly-Hartig N,Zhao K,Chan H,Gu J,Gut H,Fischle W,Müller J,Thomä NH

doi

10.1016/j.molcel.2011.03.025

subject

Has Abstract

pub_date

2011-05-06 00:00:00

pages

330-41

issue

3

eissn

1097-2765

issn

1097-4164

pii

S1097-2765(11)00287-5

journal_volume

42

pub_type

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