腫瘍抑制剤p53の本質的に無秩序なトランザクティベーション領域内の連鎖運動の長距離調節
Jenifer K Lum1, Hannes Neuweiler, Alan R Fersht
1Medical Research Council Laboratory of Molecular Biology, Hills Road, Cambridge CB2 0QH, United Kingdom.
Journal of the American Chemical Society
|December 20, 2011
まとめ
腫瘍抑制剤であるp53が
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.
- タンパク質のダイナミクス
背景:
- 腫瘍抑制物質であるp53タンパク質は,細胞の調節に極めて重要です.
- 本質的に無秩序なN端領域 (p53-TAD) は,多数のパートナーと相互作用する.
- MDM2のような結合パートナーは,p53-TAD.の局所構造を誘導することができます.
研究 の 目的:
- p53-TAD.におけるセグメンタルチェーン運動を調査する.
- タンパク質の結合とリン酸化がこれらの運動にどのように影響するかを理解するために.
- 規制の変更に対するp53-TADのダイナミックな反応を探求する.
主な方法:
- フォースター共振エネルギー伝達 (FRET) - 光相関スペクトロスコーピー (FCS) を利用しました.
- p53-TAD.内の4つの連続したセグメントのループ閉鎖運動を研究した.
- 鎖ダイナミクスに対するMDM2結合とリン酸化の影響を分析した.
主要な成果:
- p53-TADは,ランダムなコイルモデルから逸脱する多次元の運動学を示しています.
- MDM2結合とリン酸化により,鎖内運動パターンが変化した.
- 鎖の動きにおける予期せぬ変化が,結合とリン酸化時に遠隔地で観察された.
結論:
- p53-TADのような内在的に無秩序なドメインは,複雑な構成動態を持っています.
- パートナー・バインディングと翻訳後の修正は,これらの領域内で長距離の相互作用を誘導することができます.
- これらの発見は,p53機能のより複雑な規制メカニズムを明らかにしています.
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