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Subject: ING2 PHD domain links histone H3 lysine 4 methylation to active gene repression : Nature
Date: Tue, 23 May 2006 13:49:55 +0200
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<H1 class=3Dpage-header>Letter</H1>
<P id=3Dcite><I>Nature</I> advance online publication 21 May 2006 | =
<ABBR=20
title=3D"Digital Object Identifier">doi</ABBR>:10.1038/nature04835; =
Received 27=20
February 2006; Accepted 17 April 2006; Published online 21 May 2006</P>
<H2 id=3Datl>ING2 PHD domain links histone H3 lysine 4 methylation to =
active gene=20
repression</H2>
<P id=3Daug>Xiaobing Shi<SUP><A title=3D"affiliated with "=20
href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/full/nature048=
35.html#a1">1</A></SUP>,=20
Tao Hong<SUP><A title=3D"affiliated with "=20
href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/full/nature048=
35.html#a2">2</A></SUP>,=20
Kay L. Walter<SUP><A title=3D"affiliated with "=20
href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/full/nature048=
35.html#a1">1</A></SUP>,=20
Mark Ewalt<SUP><A title=3D"affiliated with "=20
href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/full/nature048=
35.html#a1">1</A></SUP>,=20
Eriko Michishita<SUP><A title=3D"affiliated with "=20
href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/full/nature048=
35.html#a2">2</A></SUP>,=20
Tiffany Hung<SUP><A title=3D"affiliated with "=20
href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/full/nature048=
35.html#a1">1</A></SUP>,=20
Dylan Carney<SUP><A title=3D"affiliated with "=20
href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/full/nature048=
35.html#a1">1</A></SUP>,=20
Pedro Pe=F1a<SUP><A title=3D"affiliated with "=20
href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/full/nature048=
35.html#a3">3</A></SUP>,=20
Fei Lan<SUP><A title=3D"affiliated with "=20
href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/full/nature048=
35.html#a4">4</A></SUP>,=20
Mohan R. Kaadige<SUP><A title=3D"affiliated with "=20
href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/full/nature048=
35.html#a5">5</A></SUP>,=20
Nicolas Lacoste<SUP><A title=3D"affiliated with "=20
href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/full/nature048=
35.html#a6">6</A></SUP>,=20
Christelle Cayrou<SUP><A title=3D"affiliated with "=20
href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/full/nature048=
35.html#a6">6</A></SUP>,=20
Foteini Davrazou<SUP><A title=3D"affiliated with "=20
href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/full/nature048=
35.html#a3">3</A></SUP>,=20
Anjanabha Saha<SUP><A title=3D"affiliated with "=20
href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/full/nature048=
35.html#a5">5</A></SUP>,=20
Bradley R. Cairns<SUP><A title=3D"affiliated with "=20
href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/full/nature048=
35.html#a5">5</A></SUP>,=20
Donald E. Ayer<SUP><A title=3D"affiliated with "=20
href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/full/nature048=
35.html#a5">5</A></SUP>,=20
Tatiana G. Kutateladze<SUP><A title=3D"affiliated with "=20
href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/full/nature048=
35.html#a3">3</A></SUP>,=20
Yang Shi<SUP><A title=3D"affiliated with "=20
href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/full/nature048=
35.html#a4">4</A></SUP>,=20
Jacques C=F4t=E9<SUP><A title=3D"affiliated with "=20
href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/full/nature048=
35.html#a6">6</A></SUP>,=20
Katrin F. Chua<SUP><A title=3D"affiliated with "=20
href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/full/nature048=
35.html#a2">2</A>,</SUP><SUP><A=20
title=3D"affiliated with "=20
href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/full/nature048=
35.html#a7">7</A></SUP>=20
and&nbsp;Or Gozani<SUP><A title=3D"affiliated with "=20
href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/full/nature048=
35.html#a1">1</A></SUP></P>
<DIV id=3Darticlebody>
<DIV id=3Dabs><A class=3D"backtotop hidden"=20
href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/full/nature048=
35.html#top">Top<SPAN=20
class=3Dhidden> of page</SPAN></A>
<H3 class=3Dhidden>Abstract</H3>
<P class=3Dlead>Dynamic regulation of diverse nuclear processes is =
intimately=20
linked to covalent modifications of chromatin<SUP><A=20
href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/full/nature048=
35.html#B1">1,=20
</A></SUP><SUP><A=20
href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/full/nature048=
35.html#B2">2</A></SUP>.=20
Much attention has focused on methylation at lysine 4 of histone H3 =
(H3K4),=20
owing to its association with euchromatic genomic regions<SUP><A=20
href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/full/nature048=
35.html#B3">3,=20
</A></SUP><SUP><A=20
href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/full/nature048=
35.html#B4">4</A></SUP>.=20
H3K4 can be mono-, di- or tri-methylated. Trimethylated H3K4 (H3K4me3) =
is=20
preferentially detected at active genes, and is proposed to promote gene =

expression through recognition by transcription-activating effector=20
molecules<SUP><A=20
href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/full/nature048=
35.html#B5">5</A></SUP>.=20
Here we identify a novel class of methylated H3K4 effector domains=97the =
PHD=20
domains of the ING (for inhibitor of growth) family of tumour suppressor =

proteins. The ING PHD domains are specific and highly robust binding =
modules for=20
H3K4me3 and H3K4me2. ING2, a native subunit of a repressive =
mSin3a=96HDAC1 histone=20
deacetylase complex<SUP><A=20
href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/full/nature048=
35.html#B6">6</A></SUP>,=20
binds with high affinity to the trimethylated species. In response to =
DNA=20
damage, recognition of H3K4me3 by the ING2 PHD domain stabilizes the=20
mSin3a=96HDAC1 complex at the promoters of proliferation genes. This =
pathway=20
constitutes a new mechanism by which H3K4me3 functions in active gene=20
repression. Furthermore, ING2 modulates cellular responses to genotoxic =
insults,=20
and these functions are critically dependent on ING2 interaction with =
H3K4me3.=20
Together, our findings establish a pivotal role for trimethylation of =
H3K4 in=20
gene repression and, potentially, tumour suppressor =
mechanisms.</P></DIV>
<P class=3Dnorm>Binding of the ING2 PHD (ING2<SUB>PHD</SUB>) domain to =
the lipid=20
signalling molecule phosphatidylinositol-5-phosphate (PtdIns(5)P) is =
critical=20
for ING2 recruitment to chromatin during DNA damage responses<SUP><A=20
href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/full/nature048=
35.html#B7">7</A></SUP>.=20
Because some phosphatidylinositol phosphate (PtdInsP)-binding domains =
function=20
through dual recognition of lipids and peptides<SUP><A=20
href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/full/nature048=
35.html#B8">8,=20
</A></SUP><SUP><A=20
href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/full/nature048=
35.html#B9">9</A></SUP>,=20
we asked whether the ING2 PHD domain has protein, in addition to =
PtdInsP,=20
ligands. In an <I>in vitro</I> pull-down screen for ING2<SUB>PHD</SUB> =
protein=20
binding partners, we identified histone H3 (<A=20
href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/suppinfo/natur=
e04835.html">Supplementary=20
Fig. S1a</A>). ING2<SUB>PHD</SUB>-binding to H3 was independent of=20
PtdIns(5)P-binding, and was confirmed in direct pull-down assays from =
purified=20
bulk histones (<A=20
href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/full/nature048=
35.html#f1">Fig.=20
1a</A>, <A=20
href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/full/nature048=
35.html#f1">c</A>;=20
<A=20
href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/suppinfo/natur=
e04835.html">Supplementary=20
Fig. S1a</A>).</P>
<DIV class=3Dfigure-table id=3Df1>
<H5 class=3Dnorm><A=20
href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/fig_tab/nature=
04835_F1.html">Figure=20
1:&nbsp;<B>The ING2 PHD domain specifically binds to H3K4me3 <I>in=20
vitro</I>.</B></A></H5><A=20
href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/fig_tab/nature=
04835_F1.html"><IMG=20
class=3Dthumb=20
alt=3D"Figure 1 : The ING2 PHD domain specifically binds to H3K4me3 in =
vitro. Unfortunately we are unable to provide accessible alternative =
text for this. If you require assistance to access this image, or to =
obtain a text description, please contact npg@nature.com"=20
src=3D"http://www.nature.com/nature/journal/vaop/ncurrent/images/nature04=
835-f1.0.jpg"></A>
<P class=3D""><B>a</B>, Coomassie-blue stain of glutathione =
<I>S</I>-transferase=20
(GST)=96ING2<SUB>PHD</SUB> and GST control pull downs from calf thymus =
histones.=20
<B>b</B>, Gel shift showing ING2<SUB>PHD</SUB>-binding to purified =
native=20
nucleosomes. Ethidium-bromide stain of nucleosomal DNA on a =
non-denaturing gel.=20
<B>c</B>, Western blot analysis of GST pull-down assays as in <B>a</B>.=20
<B>d</B>, The ING2 PHD domain preferentially binds H3K4me3 peptides. =
Western=20
analysis of histone peptide pull downs with the indicated GST fusion =
proteins=20
and biotinylated peptides. Peptide integrity was confirmed with known=20
methyl-lysine-binding domains (Supplementary Fig. S1d, e). aa, amino =
acids.=20
<B>e</B>, Methylation at H3K4 is required for ING2<SUB>PHD</SUB>-binding =
to=20
chromatin <I>in vitro</I>. Western analysis of GST=96ING2<SUB>PHD</SUB> =
pull-down=20
assays of chromatin purified from wild-type or Set1-null <I>S. =
cerevisiae</I>=20
strains. <B>f</B>, PHD domains of yeast and human ING family proteins=20
preferentially bind to H3K4me2/3 in histone peptide binding =
assays.</P><A=20
class=3Dhigh-res=20
href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/fig_tab/nature=
04835_F1.html">High=20
resolution image and legend (47K) </A><SPAN=20
class=3Dcleardiv><!-- --></SPAN></DIV><BR class=3Dclear>
<P class=3Dnorm>The ING2 PHD domain bound robustly to native =
mononucleosomes=20
purified from mammalian cells (<A=20
href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/full/nature048=
35.html#f1">Fig.=20
1b</A>), but, in contrast to the ACF (ATP-dependent chromatin-assembly =
factor)=20
and p300 (E1A binding protein p300) PHD domains, did not bind =
mononucleosomes=20
reconstituted from recombinant histones (<A=20
href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/suppinfo/natur=
e04835.html">Supplementary=20
Fig. S1b</A>)<SUP><A=20
href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/full/nature048=
35.html#B10">10,=20
</A></SUP><SUP><A=20
href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/full/nature048=
35.html#B11">11</A></SUP>.=20
Therefore, we postulated that this domain might recognize a =
post-translational=20
H3 modification. Western blot analysis of ING2<SUB>PHD</SUB>-bound =
histones=20
revealed significant methylation of H3 on lysine 4, but not lysine 9 (<A =

href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/full/nature048=
35.html#f1">Fig.=20
1c</A>). In <I>in vitro</I> binding assays of methylated histone =
peptides, the=20
ING2 PHD domain bound most strongly to H3K4me3, with lower affinity to =
H3K4me2,=20
and not at all to numerous other peptides (<A=20
href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/full/nature048=
35.html#f1">Fig.=20
1d</A>; <A=20
href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/suppinfo/natur=
e04835.html">Supplementary=20
Fig. S1c</A>).</P>
<P class=3Dnorm>In the accompanying paper describing the crystal =
structure of the=20
ING2<SUB>PHD</SUB>=96H3K4me3 peptide complex, aspartate 230 (D230) of =
ING2 is=20
implicated in H3K4me3 recognition<SUP><A=20
href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/full/nature048=
35.html#B12">12</A></SUP>.=20
Accordingly, substitution of D230 to alanine (ING2<SUB>PHD-D230A</SUB>) =
mostly=20
abolished H3K4me3 peptide binding (<A=20
href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/full/nature048=
35.html#f1">Fig.=20
1d</A>). The effect of this substitution is not due to unfolding of the =
PHD=20
domain, as determined by NMR two-dimensional spectra<SUP><A=20
href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/full/nature048=
35.html#B12">12</A></SUP>.=20
Notably, this mutation has no effect on the lipid-binding activity of =
the ING2=20
PHD domain (<A=20
href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/suppinfo/natur=
e04835.html">Supplementary=20
Fig. S2</A>), and therefore allows selective abrogation of the =
ING2=96H3K4me3=20
interaction for functional studies (see below). Finally, full-length =
ING2, but=20
not a PHD domain deletion mutant (ING2<SUB><IMG alt=3DDelta=20
src=3D"http://www.nature.com/__chars/_delta/black/med/small/glyph.gif"=20
align=3Dbottom border=3D0>PHD</SUB>), bound specifically to methylated =
H3K4 peptides=20
(<A=20
href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/full/nature048=
35.html#f1">Fig.=20
1d</A>). Thus, the ING2 PHD domain is necessary and sufficient for ING2=20
interaction with H3K4me3 <I>in vitro.</I></P>
<P class=3Dnorm>The association of the ING2 PHD domain with H3 was =
increased by=20
hypermethylation of bulk histones with the H3K4 methyltransferase SET7 =
(also=20
known as SET9; ref. <A=20
href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/full/nature048=
35.html#B13">13</A>)=20
and decreased by the H3K4 demethylase LSD1 (also known as AOF2; ref. <A=20
href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/full/nature048=
35.html#B14">14</A>)=20
(<A=20
href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/suppinfo/natur=
e04835.html">Supplementary=20
Fig. S3</A>). Moreover, the ING2 PHD domain bound efficiently to H3 in =
chromatin=20
purified from wild-type <I>Saccharomyces cerevisiae</I> strains, but not =
from=20
strains lacking the H3K4 methyltransferase Set1 (<A=20
href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/full/nature048=
35.html#f1">Fig.=20
1e</A>). Together, these data indicate that H3K4 methylation is critical =
for=20
ING2<SUB>PHD</SUB>-binding to histone H3 at chromatin <I>in =
vitro</I>.</P>
<P class=3Dnorm>Like the ING2 PHD domain, the PHD domains of the <I>S.=20
cerevisiae</I> and other human ING family members all bound =
preferentially to=20
di- and tri-methylated H3K4, whereas that of the Mi<IMG alt=3Dalpha=20
src=3D"http://www.nature.com/__chars/alpha/black/med/base/glyph.gif" =
align=3Dbottom=20
border=3D0>2 autoantigen bound to trimethylated H3K36 (<A=20
href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/full/nature048=
35.html#f1">Fig.=20
1f</A>; <A=20
href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/suppinfo/natur=
e04835.html">Supplementary=20
Fig. S4a, b</A>). Thus, recognition of methylated histone peptides is a =
general=20
feature of at least a subset of PHD domains, with the ING PHD family=20
constituting a novel class of binding modules for methylated H3K4.</P>
<P class=3Dnorm>The functional role of ING2 in the context of =
mSin3a=96HDAC1=20
complexes is unclear<SUP><A=20
href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/full/nature048=
35.html#B6">6</A></SUP>.=20
We postulated that ING2 bridges the mSin3a=96HDAC1 complex with =
methylated H3K4=20
through its PHD domain, and thereby promotes deacetylation of nearby =
acetylated=20
histone residues. To test this idea, we purified ING2=96mSin3a=96HDAC1 =
complexes=20
containing ING2, ING2<SUB><IMG alt=3DDelta=20
src=3D"http://www.nature.com/__chars/_delta/black/med/small/glyph.gif"=20
align=3Dbottom border=3D0>PHD</SUB> or ING2<SUB>D230A</SUB>. Neither =
mutation=20
altered the composition of the ING2 complexes (<A=20
href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/full/nature048=
35.html#f2">Fig.=20
2a</A>; <A=20
href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/suppinfo/natur=
e04835.html">Supplementary=20
Fig. S5</A>). In peptide pull-down assays, the wild-type, but not =
mutant, ING2=20
complexes bound preferentially to H3K4me3 (<A=20
href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/full/nature048=
35.html#f2">Fig.=20
2b</A>). Furthermore, hypermethylation of H3K4 by SET7 enhanced the =
histone=20
deacetylase activity of the wild-type, but not mutant, ING2 complexes =
(<A=20
href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/full/nature048=
35.html#f2">Figs=20
2c</A>, <A=20
href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/full/nature048=
35.html#f2">d</A>).=20
Therefore, recognition of methylated H3K4 by the ING2 PHD domain =
promotes the=20
histone deacetylase activity of mSin3a=96HDAC1 complexes <I>in =
vitro</I>.</P>
<DIV class=3Dfigure-table id=3Df2>
<H5 class=3Dnorm><A=20
href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/fig_tab/nature=
04835_F2.html">Figure=20
2:&nbsp;<B>Methylated H3K4 recognition by the ING2 PHD domain enhances=20
ING2-associated HDAC1 histone deacetylase activity <I>in=20
vitro</I>.</B></A></H5><A=20
href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/fig_tab/nature=
04835_F2.html"><IMG=20
class=3Dthumb=20
alt=3D"Figure 2 : Methylated H3K4 recognition by the ING2 PHD domain =
enhances ING2-associated HDAC1 histone deacetylase activity in vitro. =
Unfortunately we are unable to provide accessible alternative text for =
this. If you require assistance to access this image, or to obtain a =
text description, please contact npg@nature.com"=20
src=3D"http://www.nature.com/nature/journal/vaop/ncurrent/images/nature04=
835-f2.0.jpg"></A>
<P class=3D""><B>a</B>, Western analysis of affinity-purified wild-type =
and mutant=20
Flag=96ING2 complexes. Mock, empty vector control immunoprecipitation. =
<B>b</B>,=20
Binding of ING2 complexes to methylated H3K4 peptides requires an intact =
PHD=20
domain. Anti-ING2 western analysis of histone peptide pull downs from =
the=20
indicated HDAC1=96ING2 complexes. <B>c</B>, Histone deacetylation by =
HDAC1 in=20
wild-type, but not mutant, ING2 complexes is increased by binding of the =
ING2=20
PHD domain to methylated H3K4. Western analysis of <I>in vitro</I> =
histone=20
deacetylation reactions by ING2 complexes in the presence or absence of=20
methylation by SET7. Histone deacetylase inhibition with trichostatin A =
(TSA) is=20
shown as a control. <B>d</B>, Quantification of relative histone =
deacetylase=20
activity of ING2 complexes as in <B>c</B> from three independent =
experiments.=20
Error bars indicate the s.e.m.</P><A class=3Dhigh-res=20
href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/fig_tab/nature=
04835_F2.html">High=20
resolution image and legend (54K) </A><SPAN=20
class=3Dcleardiv><!-- --></SPAN></DIV><BR class=3Dclear>
<P class=3Dnorm>We next studied the recognition of methylated H3K4 by =
the ING2 PHD=20
domain in the context of physiological chromatin in cells. In =
protein=96protein=20
chromatin immunoprecipitation (ChIP) assays<SUP><A=20
href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/full/nature048=
35.html#B15">15</A></SUP>,=20
wild-type ING2 associated strongly with H3K4me3, but only weakly with =
H3K4me2=20
and not at all with other modified histones, suggesting that H3K4me3 is =
the=20
preferred <I>in vivo</I> target of ING2 (<A=20
href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/full/nature048=
35.html#f3">Fig.=20
3a</A>; data not shown). Moreover, the H3K4me3 interaction was mostly =
abolished=20
by the D230A mutation and several additional substitutions that disrupt=20
H3K4me3-binding <I>in vitro</I><SUP><A=20
href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/full/nature048=
35.html#B12">12</A></SUP>=20
(<A=20
href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/full/nature048=
35.html#f3">Fig.=20
3a</A>, <A=20
href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/full/nature048=
35.html#f3">b</A>;=20
data not shown). We conclude that the PHD domain is required for the =
association=20
of ING2 with H3K4me3 at chromatin <I>in vivo</I>.</P>
<DIV class=3Dfigure-table id=3Df3>
<H5 class=3Dnorm><A=20
href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/fig_tab/nature=
04835_F3.html">Figure=20
3:&nbsp;<B>The ING2 interaction with trimethylated H3K4 occurs <I>in =
vivo</I>=20
and requires an intact PHD domain.</B></A></H5><A=20
href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/fig_tab/nature=
04835_F3.html"><IMG=20
class=3Dthumb=20
alt=3D"Figure 3 : The ING2 interaction with trimethylated H3K4 occurs in =
vivo and requires an intact PHD domain. Unfortunately we are unable to =
provide accessible alternative text for this. If you require assistance =
to access this image, or to obtain a text description, please contact =
npg@nature.com"=20
src=3D"http://www.nature.com/nature/journal/vaop/ncurrent/images/nature04=
835-f3.0.jpg"></A>
<P class=3D""><B>a</B>, <B>b</B>, <I>In vivo</I> association of =
wild-type, but not=20
PHD domain mutant, ING2 proteins with H3K4me3 at chromatin. Western =
analysis of=20
proteins crosslinked <I>in situ</I> to wild-type or mutant Flag=96ING2 =
proteins in=20
protein=96protein ChIPs. Note equal binding of mutant and wild-type ING2 =
to SAP30=20
(<B>a</B>) and HDAC1 (<B>b</B>). Input loaded represents 5% of total. =
<B>c</B>,=20
Decreased H3K4me3 levels following WDR5 knockdown. Western analysis of =
HEK293T=20
cells transfected with <I>WDR5</I> or control RNA interference (RNAi) =
vectors.=20
<B>d</B>, Flag=96ING2 association with endogenous H3 requires H3K4me3. =
Western=20
analysis of protein=96protein ChIPs as in <B>a</B> with or without WDR5 =
knockdown.=20
<B>e</B>, Endogenous association of H3 and ING2 requires H3K4me3. =
Western=20
analysis of H3-bound proteins by protein=96protein ChIP, with or without =
WDR5=20
knockdown. <B>f</B>, WDR5 knockdown decreases ING2 occupancy at the =
cyclin D1=20
promoter. Levels (per cent input =3D ChIP/input <IMG alt=3Dtimes=20
src=3D"http://www.nature.com/__chars/math/special/times/black/med/base/gl=
yph.gif"=20
align=3Dmiddle border=3D0> 100) of cyclin D1 promoter and 3' coding =
region sequences=20
in the indicated ChIPs, with or without WDR5 knockdown. Error bars =
indicate the=20
s.e.m. from three independent experiments.</P><A class=3Dhigh-res=20
href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/fig_tab/nature=
04835_F3.html">High=20
resolution image and legend (63K) </A><SPAN=20
class=3Dcleardiv><!-- --></SPAN></DIV><BR class=3Dclear>
<P class=3Dnorm>To determine whether endogenous H3K4me3 is important for =
ING2=20
association with H3, we knocked down the expression of the =
methyltransferase=20
component, the WD40-repeat protein WDR5, which leads to a specific =
reduction in=20
H3K4me3 levels (<A=20
href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/full/nature048=
35.html#f3">Fig.=20
3c</A>)<SUP><A=20
href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/full/nature048=
35.html#B16">16</A></SUP>.=20
This was accompanied by substantially reduced binding of both =
Flag-tagged and=20
endogenous ING2 to H3 at chromatin (without affecting complex formation =
with=20
HDAC1) (<A=20
href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/full/nature048=
35.html#f3">Fig.=20
3d</A>, <A=20
href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/full/nature048=
35.html#f3">e</A>).=20
Thus, H3K4me3 is required for interaction of ING2 with H3, and =
endogenous ING2=20
specifically associates with trimethylated H3K4 at chromatin <I>in =
vivo.</I></P>
<P class=3Dnorm>To investigate ING2 association with chromatin at a =
target gene,=20
we focused on the cell-cycle regulator cyclin D1. This gene is =
transcriptionally=20
inactivated by the mSin3a=96HDAC1 complex<SUP><A=20
href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/full/nature048=
35.html#B17">17</A></SUP>.=20
In ChIP analyses, Flag=96ING2 (and tri- and di-methylated H3K4, as =
expected<SUP><A=20
href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/full/nature048=
35.html#B3">3,=20
</A></SUP><SUP><A=20
href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/full/nature048=
35.html#B4">4</A></SUP>)=20
are specifically detected at the cyclin D1 promoter but not at 3' coding =
regions=20
(<A=20
href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/full/nature048=
35.html#f3">Fig.=20
3f</A>; <A=20
href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/suppinfo/natur=
e04835.html">Supplementary=20
Fig. S6a</A>). Furthermore, WDR5 knockdown decreased ING2 occupancy at =
the=20
cyclin D1 promoter (<A=20
href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/full/nature048=
35.html#f3">Fig.=20
3f</A>). Thus, trimethylation of H3K4 is important for ING2 association =
at the=20
cyclin D1 promoter.</P>
<P class=3Dnorm>To investigate the biological significance of the =
ING2=96H3K4me3=20
interaction, we used an ING2 complementation system<SUP><A=20
href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/full/nature048=
35.html#B7">7</A></SUP>,=20
whereby RNA interference (RNAi)-resistant wild-type or mutant (D230A or =
<IMG=20
alt=3DDelta =
src=3D"http://www.nature.com/__chars/_delta/black/med/base/glyph.gif"=20
align=3Dbottom border=3D0>PHD) ING2 constructs were stably expressed in =
ING2=20
knockdown cells. ING2 expression was substantially reduced in the =
knockdown=20
cells, and the different ING2 constructs reconstituted expression at =
comparable=20
levels (<A=20
href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/full/nature048=
35.html#f4">Fig.=20
4a</A>). Notably, the ING2 knockdown cells showed impaired cyclin D1 =
mRNA=20
repression in response to doxorubicin compared with control (wild-type) =
cells,=20
and complementation of knockdown cells with wild-type ING2 mostly =
restored=20
efficient cyclin D1 repression (<A=20
href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/full/nature048=
35.html#f4">Fig.=20
4b</A>). In contrast, the ING2<SUB>D230A</SUB> and ING2<SUB><IMG =
alt=3DDelta=20
src=3D"http://www.nature.com/__chars/_delta/black/med/small/glyph.gif"=20
align=3Dbottom border=3D0>PHD</SUB> proteins showed significantly =
reduced=20
reconstitution activities (<A=20
href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/full/nature048=
35.html#f4">Fig.=20
4c</A>). Thus, PHD domain recognition of H3K4me3 is important for =
ING2-mediated=20
repression of cyclin D1 mRNA expression in response to DNA damage.</P>
<DIV class=3Dfigure-table id=3Df4>
<H5 class=3Dnorm><A=20
href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/fig_tab/nature=
04835_F4.html">Figure=20
4:&nbsp;<B>Recognition of H3K4me3 by ING2 PHD domain <I>in vivo</I> is =
critical=20
for ING2 function.</B></A></H5><A=20
href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/fig_tab/nature=
04835_F4.html"><IMG=20
class=3Dthumb=20
alt=3D"Figure 4 : Recognition of H3K4me3 by ING2 PHD domain in vivo is =
critical for ING2 function. Unfortunately we are unable to provide =
accessible alternative text for this. If you require assistance to =
access this image, or to obtain a text description, please contact =
npg@nature.com"=20
src=3D"http://www.nature.com/nature/journal/vaop/ncurrent/images/nature04=
835-f4.0.jpg"></A>
<P class=3D""><B>a</B>, Western analysis of ING2 expression in the =
indicated cell=20
lines. *, endogenous ING2. <B>b</B>, ING2 is required for repression of =
cyclin=20
D1 expression in response to doxorubicin (dox). Quantitative PCR of =
cyclin D1=20
mRNA, with or without doxorubicin (0.2&nbsp;<IMG alt=3Dmicro=20
src=3D"http://www.nature.com/__chars/micro/black/med/base/glyph.gif" =
align=3Dmiddle=20
border=3D0>g&nbsp;ml<SUP>-1</SUP>, 24&nbsp;h), in wild-type ("WT"), =
knockdown=20
("KD") and knockdown reconstituted with ING2 ("KD + ING2") cell lines. =
<B>c</B>,=20
Impaired activity of mutant ING2 proteins in reconstitution of=20
doxorubicin-dependent cyclin D1 repression, as in <B>b</B>, relative to=20
wild-type ING2 ("KD + ING2"). In <B>b</B> and <B>c</B>, error bars =
indicate the=20
s.e.m. of triplicate experiments; <I>P</I>-values &lt; 0.01. =
<B>d=96f</B>,=20
DNA-damage-dependent increase of ING2=96HDAC1 occupancy at the cyclin D1 =
promoter=20
requires methylated H3K4-binding. ChIPs with antibodies to Flag =
(<B>d</B>),=20
HDAC1 (<B>e</B>) and H4K8ac (<B>f</B>) at the cyclin D1 promoter in the=20
indicated cell lines, with or without doxorubicin (2&nbsp;<IMG =
alt=3Dmicro=20
src=3D"http://www.nature.com/__chars/micro/black/med/base/glyph.gif" =
align=3Dmiddle=20
border=3D0>M, 1&nbsp;h). Error bars indicate the s.e.m. of at least =
three=20
independent experiments. <I>P</I>-values &lt; 0.05. <B>g</B>, Western =
analysis=20
of cyclin D1 protein in the indicated cell lines with or without =
doxorubicin=20
(0.2&nbsp;<IMG alt=3Dmicro=20
src=3D"http://www.nature.com/__chars/micro/black/med/base/glyph.gif" =
align=3Dmiddle=20
border=3D0>g&nbsp;ml<SUP>-1</SUP>, 24&nbsp;h). <B>h</B>, Impaired =
doxorubicin=20
sensitivity following ING2 knockdown or reconstitution with=20
H3K4me3-binding-defective ING2. Relative cell viability is normalized to =

untreated cells. Error bars indicate the s.e.m. of 3=966 independent=20
experiments.</P><A class=3Dhigh-res=20
href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/fig_tab/nature=
04835_F4.html">High=20
resolution image and legend (71K) </A><SPAN=20
class=3Dcleardiv><!-- --></SPAN></DIV><BR class=3Dclear>
<P class=3Dnorm>Next, we examined promoter occupancy of the ING2=96HDAC1 =
complexes=20
in response to DNA damage. Doxorubicin treatment increased promoter =
occupancy of=20
wild-type, but not mutant, ING2 at the cyclin D1 promoter (<A=20
href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/full/nature048=
35.html#f4">Fig.=20
4d</A>), as well as a second HDAC1-regulated DNA-damage response gene,=20
<I>c-Myc</I> (<A=20
href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/suppinfo/natur=
e04835.html">Supplementary=20
Fig. S7</A>)<SUP><A=20
href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/full/nature048=
35.html#B18">18</A></SUP>.=20
Furthermore, HDAC1 occupancy and histone deacetylation at the cyclin D1 =
promoter=20
both increased on DNA damage, and these responses, which were largely =
abrogated=20
in the knockdown cells, were restored by reconstitution with wild-type, =
but not=20
mutant, ING2 (<A=20
href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/full/nature048=
35.html#f4">Fig.=20
4e</A>, <A=20
href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/full/nature048=
35.html#f4">f</A>).=20
H3K4me2, H3K4me3 and H3 levels were uniform across the different cell =
lines and=20
not altered by doxorubicin treatment (<A=20
href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/suppinfo/natur=
e04835.html">Supplementary=20
Fig. S6b</A>). On western analysis, cyclin D1 protein levels were =
repressed=20
following DNA damage in the presence of wild-type ING2 (in both control =
cells=20
and knockdown cells reconstituted with ING2), but only slightly reduced =
in the=20
knockdown cells or knockdown cells reconstituted with mutant ING2 =
proteins (<A=20
href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/full/nature048=
35.html#f4">Fig.=20
4g</A>). We conclude that recognition of H3K4me3 by the ING2 PHD domain =
is=20
critical for proper occupancy of the ING2=96HDAC1 complex at target =
promoters=20
during DNA damage responses and active transcriptional repression of the =

promoter's cognate gene.</P>
<P class=3Dnorm>Finally, H3K4me3 recognition by the PHD domain is =
critical for=20
ING2 regulation of cellular functions. Specifically, ING2 knockdown=20
significantly impairs cellular sensitivity to doxorubicin (<A=20
href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/full/nature048=
35.html#f4">Fig.=20
4h</A>), and reconstitution of knockdown cells with wild-type, but not =
mutant,=20
ING2 reverses this effect (<A=20
href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/full/nature048=
35.html#f4">Fig.=20
4h</A>). Together, these data argue that the H3K4me3-binding activity of =
ING2 is=20
critical for ING2 function in the cellular response to DNA damage.</P>
<P class=3Dnorm>Our findings and previous work demonstrate that the PHD =
domain of=20
ING2 is a dual-specificity module that binds both PtdIns(5)P and =
H3K4me3. These=20
activities are separable by specific mutations within the domain, and =
both seem=20
critical for ING2 cellular functions. It is possible that =
PtdIns(5)P-binding=20
could mediate trafficking of ING2 to target promoters, where binding to =
H3K4me3=20
then contributes to retention of ING2 at these promoters (see <A=20
href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/suppinfo/natur=
e04835.html">Supplementary=20
Fig. S8</A>). In this regard, the multi-functionality of the ING2 PHD =
domain may=20
contribute to integrating complex nuclear signalling events that link =
DNA damage=20
to chromatin responses.</P>
<P class=3Dnorm>Methylation of H3K4 is proposed to have a pivotal role =
in gene=20
activation by serving as a binding platform for different=20
transcription-promoting factors<SUP><A=20
href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/full/nature048=
35.html#B16">16,=20
</A></SUP><SUP><A=20
href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/full/nature048=
35.html#B19">19,=20
</A></SUP><SUP><A=20
href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/full/nature048=
35.html#B20">20,=20
</A></SUP><SUP><A=20
href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/full/nature048=
35.html#B21">21</A></SUP>.=20
Our findings identify the ING2 PHD domain as the first effector domain =
for=20
methylated H3K4 that links this modification to transcriptional =
repression. By=20
focusing HDAC1 repressor complexes on actively transcribed genes, =
recognition of=20
H3K4me3 by ING2 may be important for the efficiency of acute gene =
repression.=20
Such a mechanism may be particularly important in the context of =
cellular=20
responses to acute stress, such as DNA damage, in which rapid shut-off =
of=20
proliferation genes is critical to prevent propagation of cells =
harbouring=20
damaged DNA. The PHD domains of the other ING proteins also bind =
methylated=20
H3K4, and thus may link this modification to additional cellular =
functions.=20
Moreover, the PHD domain of the nucleosome remodelling factor (NURF) =
complex=20
component BPTF (bromodomain and PHD domain transcription factor) also =
recognizes=20
methylated H3K4 (ref. <A=20
href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/full/nature048=
35.html#B22">22</A>),=20
suggesting a more general role for PHD domains as methyl-lysine effector =

domains. Together, our findings highlight the notion that the =
recognition of=20
chromatin modifications by effector proteins, rather than the specific=20
modification <I>per se</I>, determines biological function, and, as =
such,=20
greatly expands the diversity of signalling at chromatin.</P>
<DIV id=3DMethods>
<H3>Methods</H3>
<DIV id=3D"Histone peptide binding assays">
<H4 class=3Dnorm>Histone peptide binding assays</H4>
<P class=3Dfollows-h4><A=20
href=3D"http://www.biocompare.com/natureproducts/go.asp?id=3Dnature04835_=
p_p1">Biotinylated=20
histone peptides</A> were synthesized at Stanford Protein and Nucleic =
Acid=20
facility or purchased from Upstate Biotechnology. Briefly, 0.5&nbsp;<IMG =

alt=3Dmicro =
src=3D"http://www.nature.com/__chars/micro/black/med/base/glyph.gif"=20
align=3Dmiddle border=3D0>g of peptides were incubated with 1&nbsp;<IMG =
alt=3Dmicro=20
src=3D"http://www.nature.com/__chars/micro/black/med/base/glyph.gif" =
align=3Dmiddle=20
border=3D0>g of protein in binding buffer (50&nbsp;mM Tris-HCl, =
pH&nbsp;7.5,=20
300&nbsp;mM NaCl, 0.1% (v/v) NP-40, 1&nbsp;mM phenylmethylsulphonyl =
fluoride=20
(PMSF)) overnight at 4&nbsp;=B0C. After 1&nbsp;h of incubation, <A=20
href=3D"http://www.biocompare.com/natureproducts/go.asp?id=3Dnature04835_=
p_p2">streptavidin=20
beads</A> (Amersham) were washed three times and subjected to western=20
analysis.</P>
<P class=3Dnorm>Protein=96protein ChIP assays for detection of <I>in =
situ</I>=20
ING2=96histone interactions was performed as described<SUP><A=20
href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/full/nature048=
35.html#B15">15</A></SUP>.=20
Cell viability assays were performed as described<SUP><A=20
href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/full/nature048=
35.html#B23">23</A></SUP>.=20
Information about antibodies, recombinant vectors, RNAi sequences and =
primers=20
are available in <A=20
href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/suppinfo/natur=
e04835.html">Supplementary=20
Information</A> and on request. Detailed methods can be found in <A=20
href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/suppinfo/natur=
e04835.html">Supplementary=20
Information</A>.</P></DIV></DIV></DIV>
<DIV id=3Dacknowledgements>
<H3>Acknowledgments</H3>
<P class=3Dnorm>We thank Y. Zhang for the SET7 expression vector, C. =
Harris for=20
ING3, ING4 and ING5 complementary DNAs, J. Wysocka and W. Herr for a =
WDR5=20
antibody, J. Wysocka and C. D. Allis for communicating unpublished =
results, J.=20
Yuan for ING2 antibodies and A. Sanchez for peptide synthesis. This work =
was=20
supported by NIH grants to O.G., Y.S. and B.R.C. O.G. is a recipient of =
a=20
Burroughs Wellcome Career Development Award in Biomedical Sciences.</P>
<H4 class=3Dinline>Competing interests statement: </H4>
<P class=3Dfollows-h4>The authors declared no competing interests.</P>
<P class=3Dnorm><A=20
href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/suppinfo/natur=
e04835.html">Supplementary=20
information</A> accompanies this paper.</P></DIV>
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Molecular=20
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=3D2&amp;SrcAuth=3DNature&amp;SrcApp=3DNature&amp;DestLinkType=3DFullReco=
rd&amp;KeyUT=3D000235068500020&amp;DestApp=3DWOS_CPL"=20
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<DIV class=3Dno-header-art></DIV>
<DIV id=3Daffiliations-notes>
<OL>
  <LI id=3Da1>Department of Biological Sciences, Stanford University, =
and
  <LI id=3Da2>Department of Medicine, Stanford University School of =
Medicine,=20
  Stanford, California 94305, USA
  <LI id=3Da3>Department of Pharmacology, University of Colorado Health =
Sciences=20
  Center, Aurora, Colorado 80045, USA
  <LI id=3Da4>Department of Pathology, Harvard Medical School, Boston,=20
  Massachusetts 02115, USA
  <LI id=3Da5>Huntsman Cancer Institute and Department of Oncological =
Sciences,=20
  University of Utah, Salt Lake City, Utah 84112, USA
  <LI id=3Da6>Laval University Cancer Research Center, Quebec City, =
Quebec G1R=20
  2J6, Canada
  <LI id=3Da7>Geriatric Research, Education and Clinical Center, VA Palo =
Alto=20
  Health Care System, Palo Alto, California 94304, USA</LI></OL>
<P class=3Dcaff>Correspondence to: Or Gozani<SUP><A title=3D"affiliated =
with "=20
href=3D"http://www.nature.com/nature/journal/vaop/ncurrent/full/nature048=
35.html#a1">1</A></SUP>=20
Correspondence and requests for materials should be addressed to O.G.=20
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