再結合ヒストンで遺伝的にN(epsilon) -メチル-L-ライシンをコードする
Duy P Nguyen1, Maria M Garcia Alai, Prashant B Kapadnis
1Medical Research Council Laboratory of Molecular Biology, Hills Road, Cambridge CB2 0QH, UK.
Journal of the American Chemical Society
|September 24, 2009
まとめ
研究者らは,ヒストンタンパク質にメチル群を正確に添加する新しい方法を開発した. この技術は,H3K9me1のような特定のヒストンのメチル化マークが,遺伝子調節などの生物学的プロセスにどのように影響するかを研究することを可能にします.
科学分野:
- バイオケミストリー バイオケミストリー
- 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.
背景:
- リシンメチル化はヒストンの重要な翻訳後の改変である.
- ヘテロクロマチンの形成と転写制御を含む表遺伝的調節において重要な役割を果たします.
- 現在の方法では,定量的,サイト固有のメチル化でタンパク質を合成する能力が欠けている.
研究 の 目的:
- 再結合ヒストンの定義された位置にN(epsilon) -メチル-L-ライシンを定量的に設置するための一般的な方法を開発する.
- メチル化依存タンパク質の相互作用を研究するためのこの方法の有用性を実証する.
主な方法:
- サイト固有のヒストンのメチル化のための新しい化学合成戦略を開発しました.
- K9 (H3K9me1) にモノメチラ化された再結合ヒストンH3を生成する方法を適用した.
- 改変したヒストンを利用してHP1結合を調査した.
主要な成果:
- 再結合ヒストンの定量的なサイト固有のリジンメチル化のための一般的な方法が成功裏に実証されました.
- H3K9me1.1.へのHP1結合を分析することによって,この方法の適用を示しました.
- メチル化依存生物学的現象のさらなる研究のためのツールを確立しました.
結論:
- 開発された方法は,ヒストンのメチル化を正確に制御することを可能にします.
- この進歩は,ヒストンのメチル化媒介による細胞過程の基礎にある分子機構の調査を容易にする.
- この戦略は,エピジェネティクス研究における広範な応用のための大きな可能性を秘めています.
関連する概念動画
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,...
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,...
Spreading of Chromatin Modifications
The histone proteins in the nucleosomes are post-translationally modified (PTM) to increase or decrease access to DNA. The commonly observed PTMs are methylation, acetylation, phosphorylation, and ubiquitination of lysine amino acids in the histone H3 tail region. These histone modifications have specific meaning for the cell. Hence, they are called "histone code". The protein complex involved in histone modification is termed as "reader-writer" complex.
Writers
The writer is an enzyme that can...
Writers
The writer is an enzyme that can...
Inheritance of Chromatin Structures
Epigenetics is the study of inherited changes in a cell's phenotype without changing the DNA sequences. It provides a form of memory for the differential gene expression pattern to maintain cell lineage, position-effect variegation, dosage compensation, and maintenance of chromatin structures such as telomeres and centromeres. For example, the structure and location of the centromere on chromosomes are epigenetically inherited. Its functionality is not dictated or ensured by the underlying DNA...
The 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...
The 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...


