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  5. 化学 科学
  7. マクロ分子化学と材料化学
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  11. 人間のino80核群複合体の構造と調節
  1. ホーム
  3. 研究分野
  5. 化学 科学
  7. マクロ分子化学と材料化学
  9. 超分子化学
  11. 人間のino80核群複合体の構造と調節

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人間のINO80核群複合体の構造と調節

Rafael Ayala1, Oliver Willhoft1, Ricardo J Aramayo1

  • 1Section of Structural Biology, Dept. Medicine, Imperial College London, London, UK.

Nature
|April 13, 2018

PubMed で要約を見る

まとめ
この要約は機械生成です。

ヒトのINO80染色体リモデラーは,DNAエントリーポイントのモータードメインで,ニュクレオソームとユニークに相互作用します. この位置付けにより,ヒストンH3の尾がINO80の活性を調節し,クロマチンの改造に関する新しい洞察を提供します.

科学分野:

  • 分子生物学
  • 構造生物学
  • エピジェネティクス

背景:

  • 細胞の転写,複製,修復などに DNAへのアクセスが不可欠です
  • 細胞は,シンプルから複雑なマルチサブユニットマシンまで,多様な核細胞再構成複合体を利用する.
  • 以前の研究では,リモデラーモータードメインをスーパーヘリカルロケーション2に局所化したが,INO80のような大きな複合体の相互作用は不明である.

研究 の 目的:

  • ヒトINO80染色体リモデラーの核細胞との相互作用の構造的メカニズムを解明する.
  • INO80がニュクレオソームのスライディング,ヒストンの交換,間隔などの機能をどのように果たすかを理解する.
  • INO80活動におけるヒストン尾の調節作用を調査する.

主な方法:

  • ヒトINO80複合体の構造を決定するX線結晶学.
  • 観察された構造的相互作用の機能的結果を分析するための生化学的測定.

主要な成果:

  • この構造は,INO80がDNAのエントリー部位にあるモータードメインと,超螺旋的な位置2で,新しい方法で結合することを示しています.
  • INO80のARP5-IES6モジュールは,核子の反対側と結合する.
  • ヒストンのH3尾は,他のリモデラーのH4尾とは異なり,INO80運動領域の活動を調節する.

さらに関連する動画

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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.
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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.
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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.
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結論:

  • INO80は,以前に特徴づけられたリモデラーとは異なるユニークな核細胞相互作用戦略を採用しています.
  • INO80の位置とH3尾の役割は,クロマチンの改造に関する新しいメカニズム的な洞察を提供します.
  • この構造的な理解は,基本的な細胞プロセスにおけるINO80の役割を理解するために不可欠です.