2b2t: Difference between revisions
New page: left|200px<br /> <applet load="2b2t" size="450" color="white" frame="true" align="right" spinBox="true" caption="2b2t, resolution 2.45Å" /> '''Tandem chromodomain... |
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[[Image:2b2t.gif|left|200px]]<br /> | [[Image:2b2t.gif|left|200px]]<br /><applet load="2b2t" size="350" color="white" frame="true" align="right" spinBox="true" | ||
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caption="2b2t, resolution 2.45Å" /> | caption="2b2t, resolution 2.45Å" /> | ||
'''Tandem chromodomains of human CHD1 complexed with Histone H3 Tail containing trimethyllysine 4 and phosphothreonine 3'''<br /> | '''Tandem chromodomains of human CHD1 complexed with Histone H3 Tail containing trimethyllysine 4 and phosphothreonine 3'''<br /> | ||
==Overview== | ==Overview== | ||
Chromodomains are modules implicated in the recognition of | Chromodomains are modules implicated in the recognition of lysine-methylated histone tails and nucleic acids. CHD (for chromo-ATPase/helicase-DNA-binding) proteins regulate ATP-dependent nucleosome assembly and mobilization through their conserved double chromodomains and SWI2/SNF2 helicase/ATPase domain. The Drosophila CHD1 localizes to the interbands and puffs of the polytene chromosomes, which are classic sites of transcriptional activity. Other CHD isoforms (CHD3/4 or Mi-2) are important for nucleosome remodelling in histone deacetylase complexes. Deletion of chromodomains impairs nucleosome binding and remodelling by CHD proteins. Here we describe the structure of the tandem arrangement of the human CHD1 chromodomains, and its interactions with histone tails. Unlike HP1 and Polycomb proteins that use single chromodomains to bind to their respective methylated histone H3 tails, the two chromodomains of CHD1 cooperate to interact with one methylated H3 tail. We show that the human CHD1 double chromodomains target the lysine 4-methylated histone H3 tail (H3K4me), a hallmark of active chromatin. Methylammonium recognition involves two aromatic residues, not the three-residue aromatic cage used by chromodomains of HP1 and Polycomb proteins. Furthermore, unique inserts within chromodomain 1 of CHD1 block the expected site of H3 tail binding seen in HP1 and Polycomb, instead directing H3 binding to a groove at the inter-chromodomain junction. | ||
==About this Structure== | ==About this Structure== | ||
2B2T is a [http://en.wikipedia.org/wiki/Protein_complex Protein complex] structure of sequences from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http:// | 2B2T is a [http://en.wikipedia.org/wiki/Protein_complex Protein complex] structure of sequences from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2B2T OCA]. | ||
==Reference== | ==Reference== | ||
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[[Category: Protein complex]] | [[Category: Protein complex]] | ||
[[Category: Chruszcz, M.]] | [[Category: Chruszcz, M.]] | ||
[[Category: Clines, K | [[Category: Clines, K L.]] | ||
[[Category: Cymborowski, M.]] | [[Category: Cymborowski, M.]] | ||
[[Category: IV, J | [[Category: IV, J F.Flanagan.]] | ||
[[Category: Khorasanizadeh, S.]] | [[Category: Khorasanizadeh, S.]] | ||
[[Category: Kim, Y.]] | [[Category: Kim, Y.]] | ||
[[Category: Mi, L | [[Category: Mi, L Z.]] | ||
[[Category: Minor, W.]] | [[Category: Minor, W.]] | ||
[[Category: Rastinejad, F.]] | [[Category: Rastinejad, F.]] | ||
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[[Category: trimethyllysine]] | [[Category: trimethyllysine]] | ||
''Page seeded by [http:// | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 16:34:18 2008'' | ||
Revision as of 17:34, 21 February 2008
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Tandem chromodomains of human CHD1 complexed with Histone H3 Tail containing trimethyllysine 4 and phosphothreonine 3
OverviewOverview
Chromodomains are modules implicated in the recognition of lysine-methylated histone tails and nucleic acids. CHD (for chromo-ATPase/helicase-DNA-binding) proteins regulate ATP-dependent nucleosome assembly and mobilization through their conserved double chromodomains and SWI2/SNF2 helicase/ATPase domain. The Drosophila CHD1 localizes to the interbands and puffs of the polytene chromosomes, which are classic sites of transcriptional activity. Other CHD isoforms (CHD3/4 or Mi-2) are important for nucleosome remodelling in histone deacetylase complexes. Deletion of chromodomains impairs nucleosome binding and remodelling by CHD proteins. Here we describe the structure of the tandem arrangement of the human CHD1 chromodomains, and its interactions with histone tails. Unlike HP1 and Polycomb proteins that use single chromodomains to bind to their respective methylated histone H3 tails, the two chromodomains of CHD1 cooperate to interact with one methylated H3 tail. We show that the human CHD1 double chromodomains target the lysine 4-methylated histone H3 tail (H3K4me), a hallmark of active chromatin. Methylammonium recognition involves two aromatic residues, not the three-residue aromatic cage used by chromodomains of HP1 and Polycomb proteins. Furthermore, unique inserts within chromodomain 1 of CHD1 block the expected site of H3 tail binding seen in HP1 and Polycomb, instead directing H3 binding to a groove at the inter-chromodomain junction.
About this StructureAbout this Structure
2B2T is a Protein complex structure of sequences from Homo sapiens. Full crystallographic information is available from OCA.
ReferenceReference
Double chromodomains cooperate to recognize the methylated histone H3 tail., Flanagan JF, Mi LZ, Chruszcz M, Cymborowski M, Clines KL, Kim Y, Minor W, Rastinejad F, Khorasanizadeh S, Nature. 2005 Dec 22;438(7071):1181-5. PMID:16372014
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