関連する実験動画
Updated: May 16, 2026
11:36
In Vitro Ubiquitination and Deubiquitination Assays of Nucleosomal Histones
Published on: July 25, 2019
半合成を用いて準備された同質的に無所不在なH2AとH2Bを含む核細胞の安定性
Beat Fierz1, Sinan Kilic, Aaron R Hieb
1Department of Chemistry, Princeton University, Princeton, New Jersey 08544, United States.
Journal of the American Chemical Society
|November 21, 2012
まとめ
研究者は,クロマチンの研究のために,ユビキチル化ヒストンH2A (uH2A) を生成する方法を開発しました. ユビキチル化ヒストンは,以前の憶測とは対照的に,核細胞体の安定性にわずかな直接的な影響を及ぼします.
科学分野:
- バイオケミストリー バイオケミストリー
- 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
背景:
- ヒストンの翻訳後の修正 (PTM) は,ダイナミッククロマチンの調節に不可欠です.
- ヒストンの普遍化は,クロマチンの基本単位であるヌクレオソームの安定性に影響すると仮定されています.
研究 の 目的:
- どこにでも存在するヒストンH2A (uH2A) のサイト固有の合成のための方法を開発する.
- ヒストンのユビキチテレーションが核細胞の安定性に与える直接的な影響を調査する.
主な方法:
- 3ピースの発現タンパク質結合法を用いたH2Aの半合成.
- uH2Aを核細胞に組み込む.
- チャペロン結合の核細胞安定性アッセイでは,H2AとUbiquitylated H2B.を使用しています.
主要な成果:
- エクスプレスされたタンパク質の結合により,サイト特異的にオブキキチル化ヒストンH2A (uH2A) を成功裏に生成した.
- uH2Aは,さらなる研究のために,核細胞に効率的に組み込まれることができます.
- ユビキチル化ヒストン (H2AとH2B) は,核群の安定性に対して,わずかな直接的な効果を発揮する.
結論:
- 開発された半合成戦略は,ヒストンの至る所に存在することの詳細な生化学および生理学的研究を可能にします.
- ヒストンのユビキティレーションが核細胞の安定性に直接的に与える影響は,これまで考えられていたよりも少ない.
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...
02:38Heterochromatin
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...
02:38Heterochromatin
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...
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...