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ヒストンH3のCBP/p300媒介によるアセチル化がライシン56に作用する
Chandrima Das1, M Scott Lucia, Kirk C Hansen
1Department of Biochemistry and Molecular Genetics, University of Colorado School of Medicine, PO Box 6511, Aurora Colorado 80045, USA.
Nature
|March 10, 2009
まとめ
ヒストンH3ライシン56 (H3K56ac) のアセチル化は,多細胞生物におけるDNA修復と複製に不可欠である. この研究は,H3K56acの調節に関与する重要な酵素とチャペロンを特定し,がんの進行と関連付けています.
科学分野:
- エピジェネティクス エピジェネティクス
- 分子生物学は分子生物学である.
- 細胞生物学 細胞生物学
背景:
- ヒストンH3ライシン56アセチル化 (H3K56ac) は,酵母におけるDNA複製と修復に不可欠である.
- H3K56acを媒介する酵素は,真菌特異性があり,多細胞エウカリオットでの研究を制限しています.
研究 の 目的:
- 多細胞生物におけるH3K56acの役割と調節を研究する.
- H3K56ac. に関するメタゾーン酵素とチャペロンを特定する.
- H3K56acとがんとの関連を調べる
主な方法:
- 酵素アッセイは,H3K56.6のヒストンアセチルトランスファーゼ (HAT) とデセチラゼ (HDAC) を特定する.
- H3K56ac.におけるヒストンチャペロン関与 (ASF1A,CAF-1) の分析
- DNA損傷と修復中のH3K56acのダイナミクスを観察するために,ドロソフィラとヒト細胞の細胞研究.
主要な成果:
- CBP/Nejire (ハエ) とCBP/p300 (ヒト) アセチラートH3K56;ドロソフィラSir2とヒトSIRT1/SIRT2デセチラートH3K56ac.
- ヒストンのチャペロンであるASF1A (ヒト) とAsf1 (ドロソフィラ) は,H3K56のアセチル化に不可欠である.
- CAF-1 (ヒト) とCaf1 (ドロソフィラ) は,H3K56acをクロマチンに組み込むために必要です.
- H3K56acは,ドロソフィラとヒトの細胞の両方のDNA損傷に対する反応として,DNA修復部位で焦点を形成します.
- H3K56acのレベルは,様々な癌で上昇しており,ASF1A.A.の増加と相関しています.
結論:
- H3K56acはメタゾーンに保存され,特定のHAT,HDAC,ヒストンチャペロンによって調節されます.
- H3K56acは,DNA損傷部位におけるクロマチンの組立に作用する.
- がんにおけるH3K56acおよびASF1Aレベルが上昇すると,腫瘍発生に潜在的な役割が示唆される.
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