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進化的に保存されたTyr169は,プリオンタンパク質のβ2-α2ループを安定させる
Danzhi Huang1, Amedeo Caflisch
1Department of Biochemistry University of Zürich , Winterthurerstrasse 190, CH-8057 Zürich, Switzerland.
Journal of the American Chemical Society
|February 12, 2015
まとめ
プリオンタンパク質のβ2-α2ループ構造は,その変換の鍵です. 特定の変異 (Y169G) は,このループ移行のエネルギーバリアを下げ,プリオン集積に影響を与えます.
科学分野:
- バイオケミストリー バイオケミストリー
- 構造生物学 構造生物学とは
- 分子ダイナミクス 分子ダイナミクス
背景:
- 哺乳類のプリオンタンパク質 (PrP) は,細胞 (PrP(C)) と,誤った折り畳み,集積された形態として存在します.
- β2-α2ループ領域 (残留165-175) は,変換プロセスに関与しています.
- ループのダイナミクスを理解することは,プリオン病のメカニズムにとって極めて重要です.
研究 の 目的:
- プリオンタンパク質のβ2-α2ループの構造的移行を調査する.
- 野生型および突然変異のプリオンタンパク質におけるループ移行のエネルギー景観を決定する.
- 原生プリオンタンパク質構成の安定化におけるチロシン169の役割を明らかにする.
主な方法:
- Y169G単点変異型プリオンタンパク質の偏らない分子ダイナミクスシミュレーション.
- シミュレーションから得られた複数の形状を用いた自由エネルギー表面サンプリング.
- 2つの異なる計算方法を使用して,自由エネルギープロファイルの決定.
主要な成果:
- Y169G変異は,310ヘリキュールからβ回転へのβ2-α2ループの移行のエネルギーバリアを約2.5kcal/molで大幅に低下させます.
- Y169とF175の間の好ましい芳香環の積み重ねと,Y169とD178の間の安定した水素結合は,ワイルド型310螺旋形状を安定させる.
- βターンへのループの移行は,水嫌性領域 (残留物169-YSNQNNF-175) を溶媒に晒します.
結論:
- 残留169 (Y169) の保存されたチロシンは,哺乳類のプリオンタンパク質のβ2-α2ループ内の310回転の回転を安定させる上で重要な役割を果たします.
- Y169によるこの安定化は,ループの β ターンへの移行を積極的に阻害し,集積傾向の形状の採用を妨げます.
- この発見は,プリオンタンパク質の変換と結合の構造的決定因子についての分子洞察を提供します.
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