タンパク質の安定性に関する運動分析により,年齢による劣化が明らかになった
Erik McShane1, Celine Sin2, Henrik Zauber1
1Max Delbrück Center for Molecular Medicine, Robert-Rössle-Str.10, 13092 Berlin, Germany.
Cell
|October 11, 2016
まとめ
タンパク質の分解は必ずしも指数関数的なものではありません. 多くのタンパク質は若いうちに安定性が低下し,年齢とともに安定性が高くなり,タンパク質複合体の形成と多量調節に影響を与えます.
科学分野:
- 細胞生物学
- プロテオミクス
- 生物化学
背景:
- タンパク質のホメオスタシスは 細胞の機能に不可欠です
- タンパク質の分解運動を理解することは 細胞の調節の鍵です
- 以前の研究では タンパク質の分解が指数関数的に 推算されていました
研究 の 目的:
- タンパク質の分解確率が若いタンパク質と古いタンパク質に 違いがあるかどうかを調べる.
- 非指数的タンパク質分解の流行と特徴を決定する.
- タンパク質複合体と多量性に対する非指数分解の機能的影響を調査する.
主な方法:
- メタボリックパルスチェイスラベルで タンパク質の合成と分解を 追跡する
- 数千ものタンパク質の分解プロファイルを分析する量質スペクトロメトリー
- 異なる細胞の分解パターンの比較分析
主要な成果:
- タンパク質の10%以上は 非指数分解 (NED) パターンを表しています
- タンパク質は最初は安定性がなく 時間が経つにつれて安定化します
- NEDは細胞タイプにわたって保存され,タンパク質複合体ステキオメトリーとアセンブリに関連しています.
- NEDタンパク質の遺伝子増幅により 分解速度が増加します
- 分解プロファイルは,アヌプロイド細胞におけるタンパク質の豊富さの変化を予測する.
結論:
- 非指数的タンパク質分解は一般的な生物学的現象です.
- NEDはタンパク質複合体の形成と安定性に影響を与えます.
- タンパク質の分解運動は,細胞タンパク質の豊富さを調節する上で重要な役割を果たします.
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