ヒストンH3セリン10のオーロラBによるリン酸化は,ヘテロクロマチンからHP1の解離を引き起こします
Toru Hirota1, Jesse J Lipp, Ban-Hock Toh
1Research Institute of Molecular Pathology, Dr. Bohrgasse 7, A-1030 Vienna, Austria.
Nature
|October 14, 2005
まとめ
ヒストンの改変は,クロマチンのタンパク質結合を調節する. ヒストンH3セリン10のオーロラBによるリン酸化は,ミトーシス中にヘテロクロマチンタンパク質1 (HP1) を移動させ,新しいメチル/フォススイッチメカニズムを明らかにする.
科学分野:
- エピジェネティクスと分子生物学
- クロマチン生物学 クロマチン生物学
- セルラーレギュレーション セルラーレギュレーション
背景:
- ヒストンは翻訳後の修正を受け,クロマチンの構造とタンパク質の採用に影響を与えます.
- ヘテロクロマチンタンパク質1 (HP1) は,Suv39h.によって媒介される三甲基化ヒストンH3ライシン9 (H3K9me3) に結合する.
- ヒストンH3セリン10リン酸化 (H3S10ph) は,Aurora Bキナーゼによってミトーシス中に発生しますが,その機能は不明です.
研究 の 目的:
- ミトーシス中のH3S10phの機能的役割を調査する.
- ヒストンの改変がタンパク質とクロマチンの相互作用を調節するメカニズムを解明する.
- 自己免疫疾患に関連した抗体によって認識される特定のヒストン改変パターンを特定する.
主な方法:
- ミトスの染色体抗原に対する抗体を利用した.
- H3K9me3とH3S10ph.との相互作用を調査しました.
- 抑制されたH3S10ph.の条件下で,HP1のミトーシス染色体への結合を調べました.
- Suv39hとAurora Bが特定のヒストンマークを生成する役割を研究した.
主要な成果:
- H3K9me3S10phという特定のヒストンの改変が特定され,自己免疫疾患に関連した抗体によって認識されました.
- H3K9me3S10phの生成は,Suv39hとAurora B.に依存していることが実証されました.
- オーロラBによるH3S10phが,HP1がミトスの染色体から解離するのに不可欠であることを示した.
- H3S10phを阻害すると,ミトーシス中のHP1解離を防ぐことが観察されました.
結論:
- オーロラBによるH3S10phは"メチル/フォススイッチ"として作用し,ミト性ヘテロクロマチンからHP1を異動させます.
- このメカニズムは,細胞分裂中のクロマチンのタンパク質結合を調節する.
- この発見は,ミトーシスにおけるヒストン変異の機能的意義と,自己免疫反応との潜在的な関連についての洞察を提供します.
関連する概念動画
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Histone Variants at the Centromere
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Heterochromatin
The extent of chromatin compaction can be studied by staining chromatin using specific DNA binding dyes. Under the microscope, the dense-compacted regions that take up more dye are called heterochromatin. Heterochromatin is further classified into two forms – constitutive heterochromatin and facultative heterochromatin.
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Constitutive heterochromatin: It is a highly compact region of chromatin that is mostly concentrated in the centromere and telomere. Unlike euchromatin, the amino acid at 9th...
Heterochromatin
The extent of chromatin compaction can be studied by staining chromatin using specific DNA binding dyes. Under the microscope, the dense-compacted regions that take up more dye are called heterochromatin. Heterochromatin is further classified into two forms – constitutive heterochromatin and facultative heterochromatin.
Constitutive heterochromatin: It is a highly compact region of chromatin that is mostly concentrated in the centromere and telomere. Unlike euchromatin, the amino acid at 9th...
Constitutive heterochromatin: It is a highly compact region of chromatin that is mostly concentrated in the centromere and telomere. Unlike euchromatin, the amino acid at 9th...
Histone Modification
The histone proteins have a flexible N-terminal tail extending out from the nucleosome. These histone tails are often subjected to post-translational modifications such as acetylation, methylation, phosphorylation, and ubiquitination. Particular combinations of these modifications form “histone codes” that influence the chromatin folding and tissue-specific gene expression.
Acetylation
The enzyme histone acetyltransferase adds acetyl group to the histones. Another enzyme, histone deacetylase,...
Acetylation
The enzyme histone acetyltransferase adds acetyl group to the histones. Another enzyme, histone deacetylase,...


