ヌクレオソーム:ゲノム組織からゲノム調節へ
1Department of Biochemistry and Molecular Genetics, University of Virginia Health System, Charlottesville, VA 22908, USA. khorasan@virginia.edu
Cell
|January 28, 2004
まとめ
ゲノム包装の基本単位である核細胞は,ダイナミックで,表遺伝的調節に不可欠です. このレビューでは,核細胞を再構成し,DNAの転写,複製,修復に影響を与えるタンパク質を調査しています.
科学分野:
- 分子生物学は分子生物学である.
- エピジェネティクス エピジェネティクス
- ゲノミクスゲノミクスとは
背景:
- ユカリオットのゲノムは,ヒストンとDNAの円盤状の単位であるヌクレオソームに編成されています.
- 核細胞は,ゲノム包装と凝縮において重要な役割を果たします.
- 核細胞は,現在,表遺伝的結果を持つゲノムのダイナミックな調節体として理解されています.
研究 の 目的:
- 核細胞動員と再構成に関与する保存されたタンパク質構造をレビューする.
- 核細胞のヒストンおよびDNA成分をマークし,認識するタンパク質を強調する.
- 基本的DNAプロセスに対するヌクレオソームダイナミクスの影響を解明する.
主な方法:
- 核細胞の構造と機能に関する既存の文献のレビュー.
- ニュクレオソーム動態に関与する保存されたタンパク質ファミリーに焦点を当てます.
- ヒストンの改変,DNA結合,遺伝子調節の相互作用の分析.
主要な成果:
- 核細胞を動員し,再構成する保存されたタンパク質構造を特定した.
- ヒストンとDNA成分がマークされ認識されるメカニズムを詳細に説明しました.
- これらの出来事がDNAの転写,複製,再結合,修復に与える直接的な影響を確立した.
結論:
- 核粒子の改造タンパク質は,ダイナミックなゲノム調節に不可欠です.
- これらのタンパク質構造を理解することで,表遺伝子遺伝に関する洞察が得られます.
- これらのダイナミックなプロセスは,DNA代謝とゲノムの完全性にとって根本的なものです.
関連する概念動画
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...
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...
02:54Nucleosome 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...
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...
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...
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...