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2io5

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{{STRUCTURE_2io5| PDB=2io5 | SCENE= }}
{{STRUCTURE_2io5| PDB=2io5 | SCENE= }}
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'''Crystal structure of the CIA- histone H3-H4 complex'''
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===Crystal structure of the CIA- histone H3-H4 complex===
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==Overview==
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CIA (CCG1-interacting factor A)/ASF1, which is the most conserved histone chaperone among the eukaryotes, was genetically identified as a factor for an anti-silencing function (Asf1) by yeast genetic screening. Shortly after that, the CIA-histone-H3-H4 complex was isolated from Drosophila as a histone chaperone CAF-1 stimulator. Human CIA-I/II (ASF1a/b) was identified as a histone chaperone that interacts with the bromodomain-an acetylated-histone-recognizing domain-of CCG1, in the general transcription initiation factor TFIID. Intensive studies have revealed that CIA/ASF1 mediates nucleosome assembly by forming a complex with another histone chaperone in human cells and yeast, and is involved in DNA replication, transcription, DNA repair and silencing/anti-silencing in yeast. CIA/ASF1 was shown as a major storage chaperone for soluble histones in proliferating human cells. Despite all these biochemical and biological functional analyses, the structure-function relationship of the nucleosome assembly/disassembly activity of CIA/ASF1 has remained elusive. Here we report the crystal structure, at 2.7 A resolution, of CIA-I in complex with histones H3 and H4. The structure shows the histone H3-H4 dimer's mutually exclusive interactions with another histone H3-H4 dimer and CIA-I. The carboxy-terminal beta-strand of histone H4 changes its partner from the beta-strand in histone H2A to that of CIA-I through large conformational change. In vitro functional analysis demonstrated that CIA-I has a histone H3-H4 tetramer-disrupting activity. Mutants with weak histone H3-H4 dimer binding activity showed critical functional effects on cellular processes related to transcription. The histone H3-H4 tetramer-disrupting activity of CIA/ASF1 and the crystal structure of the CIA/ASF1-histone-H3-H4 dimer complex should give insights into mechanisms of both nucleosome assembly/disassembly and nucleosome semi-conservative replication.
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{{ABSTRACT_PUBMED_17293877}}
==About this Structure==
==About this Structure==
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[[Category: Chaperone]]
[[Category: Chaperone]]
[[Category: Histone]]
[[Category: Histone]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun May 4 07:42:36 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jul 28 21:59:20 2008''

Revision as of 18:59, 28 July 2008

Image:2io5.png

Template:STRUCTURE 2io5

Crystal structure of the CIA- histone H3-H4 complex

Template:ABSTRACT PUBMED 17293877

About this Structure

2IO5 is a Protein complex structure of sequences from Homo sapiens and Xenopus laevis. Full crystallographic information is available from OCA.

Reference

Structure and function of the histone chaperone CIA/ASF1 complexed with histones H3 and H4., Natsume R, Eitoku M, Akai Y, Sano N, Horikoshi M, Senda T, Nature. 2007 Mar 15;446(7133):338-41. Epub 2007 Feb 11. PMID:17293877

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