リピド二重層は,2つの異なるアミロイド原性ペプチドの交叉動を著しく調節する
Noga Gal1, Ahiud Morag, Sofiya Kolusheva
1Department of Chemistry, Ben Gurion University of the Negev , Beer Sheva, Israel 84105.
Journal of the American Chemical Society
|August 20, 2013
まとめ
誤った折りたたまれたタンパク質は,アルツハイマー病などの病気でアミロイドプラークを形成します. この研究では,関係のないアミロイドペプチド,アイレットアミロイドポリペプチド (IAPP),プリオンタンパク質 (PrP) が膜に相互作用し,フィブリレーションと病原性を変化させることが示されています.
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.
- 神経科学は神経科学である.
背景:
- 誤った折りたたまれたタンパク質からのアミロイドプラークは,アルツハイマー病やII型糖尿病のような不治の病気の特徴です.
- プリオン仮説は,誤った折りたたまれたタンパク質の種が集積を伝播し,感染症剤として作用することを示唆しています.
- 異なるアミロイドペプチド間の相互作用は,動経路と疾患の重症度に影響を与える可能性があります.
研究 の 目的:
- 構造的および生理的に無関係な2つのアミロイド原性ペプチドのフィブリレーション経路を調査する:アイレットアミロイドポリペプチド (IAPP) とプリオンタンパク質 (PrP) 決定体.
- これらの異なったペプチドの相互作用と結合を調節する膜二層の役割を決定する.
- クロスフィブリレーションが膜相互作用プロファイルとアミロイド集積物の生体物理的性質にどのように影響するか調査する.
主な方法:
- IAPPとPrPペプチドのインキュベーションは,膜バイレイヤーの存在で一緒に行われます.
- フィブリレーション経路の分析と,独特のフィブリラー種の形成.
- 交叉繊維化ペプチド種の膜相互作用プロフィールの特徴.
主要な成果:
- 脂質二重層の環境は,IAPPとPrPが一緒にインキュベートされると,フィブリレーション経路に大きな影響を与えます.
- 異なる形態学的に異なる繊維状の種は,膜の存在で組み合わされる.
- 交叉細動は,分離集積と比較して,膜相互作用プロファイルが変化する.
結論:
- 膜は重要な表面活性介質として作用し,関係のないアミロイド原性ペプチド間の相互作用を促進します.
- 膜誘発型交叉動は,動経路とペプチド集積物の生体物理的性質の両方を調節する.
- このプロセスは,タンパク質の誤折り疾患の分子病理において重要な役割を果たす可能性があります.
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