関連する実験動画
Updated: Jun 30, 2026
09:26
Reconstitution of Nucleosomes with Differentially Isotope-labeled Sister Histones
Published on: March 26, 2017
核細胞の機能を探知する:合成ヒストンのH3およびH4変異体の非常に汎用的なライブラリ
Junbiao Dai1, Edel M Hyland, Daniel S Yuan
1High Throughput Biology Center, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA.
Cell
|September 23, 2008
まとめ
研究者らは,ニュクレオソームの機能をマッピングするために486のヒストン変異体を作成し,DNA代謝,転写,修復に関する新しい洞察を明らかにしました. この研究は,クロマチンの調節とその細胞プロセスへの影響についての理解を深めます.
科学分野:
- 分子生物学は分子生物学である.
- 遺伝学 遺伝学とは
- バイオケミストリー バイオケミストリー
背景:
- 核子の構造は,DNAの代謝と転写の調節に不可欠です.
- 各ヒストン残基の正確な役割を理解することは,核細胞体の機能を解読するために不可欠です.
研究 の 目的:
- 各ヒストロンH3およびH4残基の核細胞機能への貢献を体系的に探求する.
- 化学的感受性のパターンとトランスクリプションサイレンシングの要件を核細胞表面にマッピングする.
- ヒストン残留の新たな機能と,ニュクレオソーム成分内の相互依存性を特定する.
主な方法:
- Saccharomyces cerevisiaeにおける486の体系的なヒストーンH3およびH4置換および消去変異体のライブラリを生成しました.
- 増幅,ラベル付け,マイクロアレイのハイブリッド化によるプール識別を容易にするために,各変異体のユニークな分子バーコードを活用しました.
- 競争力のあるフィットネス,DNA修復能力,合成遺伝子の相互作用を含む複雑なフェノタイプを評価した.
主要な成果:
- 化学的感受性のグローバルパターンをマッピングし,トランスクリプションサイレンシングの要件をニュクレオソーム表面にマッピングしました.
- 特定ヒストンの残基が,染色体の完全性および転写調節に不可欠である.
- 異なるヒストンの残留物に対する新しい機能と,ニュクレオソームの構成要素とその修飾物質の相互依存性を明らかにした.
結論:
- この研究は,ヒストンH3およびH4残基の包括的な機能マップを提供します.
- この研究は,核細胞のダイナミクスとDNA代謝と遺伝子発現におけるその役割についての理解を深める.
- 系統的アプローチは,クロマチンの調節に関する将来の調査のための強力なプラットフォームを提供します.
関連する概念動画
01:12The Nucleosome Core Particle
Nucleosomes are the DNA-histone complex, where the DNA strand is wound around the histone core. The histone core is an octamer containing two copies of H2A, H2B, H3, and H4 histone proteins.
Nucleosomes, paradoxically, perform two opposite functions simultaneously. On the one hand, their primary aim is to protect the delicate DNA strands from physical damage and help achieve a higher compaction ratio. On the other hand, they must allow polymerase enzymes to access histone-bound DNA during...
Nucleosomes, paradoxically, perform two opposite functions simultaneously. On the one hand, their primary aim is to protect the delicate DNA strands from physical damage and help achieve a higher compaction ratio. On the other hand, they must allow polymerase enzymes to access histone-bound DNA during...
02:10The Nucleosome Core Particle
Nucleosomes are the DNA-histone complex, where the DNA strand is wound around the histone core. The histone core is an octamer containing two copies of H2A, H2B, H3, and H4 histone proteins.
The paradox
Nucleosomes, paradoxically, perform two opposite functions simultaneously. On the one hand, their main responsibility is to protect the delicate DNA strands from physical damage and help achieve a higher compaction ratio. While on the other hand, they must allow polymerase enzymes to access DNA...
The paradox
Nucleosomes, paradoxically, perform two opposite functions simultaneously. On the one hand, their main responsibility is to protect the delicate DNA strands from physical damage and help achieve a higher compaction ratio. While on the other hand, they must allow polymerase enzymes to access DNA...
02:32Histone 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,...
02:54Nucleosome Remodeling
Nucleosomes are the basic units of chromatin compaction. Each nucleosome consists of the DNA bound tightly around a histone core, which makes the DNA inaccessible to DNA binding proteins such as DNA polymerase and RNA polymerase. Hence, the fundamental problem is to ensure access to DNA when appropriate, despite the compact and protective chromatin structure.
Nucleosome remodeling complex
Eukaryotic cells have specialized enzymes called ATP-dependent nucleosome remodeling enzymes. These enzymes...
Nucleosome remodeling complex
Eukaryotic cells have specialized enzymes called ATP-dependent nucleosome remodeling enzymes. These enzymes...
01:19The Nucleosome
Human DNA is almost two meters long. However, it is compressed inside a tiny nucleus measuring only a few microns in diameter. To make this degree of compaction possible, DNA is organized into several sequential levels so that it can fit into such a tiny space. The most compact form of DNA is a chromosome that can be seen under a microscope in a dividing cell.
In a chromosome, DNA is wound twice around a protein complex called a histone octamer core, which consists of 8 histone proteins. This...
In a chromosome, DNA is wound twice around a protein complex called a histone octamer core, which consists of 8 histone proteins. This...
02:33The Nucleosome
DNA in a human cell is almost 2m long and it is packed inside a tiny nucleus that is only a few microns in diameter. The level of compaction of DNA inside the nucleus is astonishing. It is organized into several sequentially higher levels of compaction to fit into such a tiny space. The most compact form of DNA is a chromosome that can be seen under a microscope in a dividing cell.
DNA is wound twice around a protein complex called histone core, that consist of 8 histone proteins. This complex...
DNA is wound twice around a protein complex called histone core, that consist of 8 histone proteins. This complex...