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鉄レドックス化学はα-シヌクレインの反パラレルオリゴメリゼーションを促進する
Dinendra L Abeyawardhane1, Ricardo D Fernández1, Cody J Murgas1
1Department of Chemistry , Virginia Commonwealth University , Richmond , Virginia 23284 , United States.
Journal of the American Chemical Society
|April 3, 2018
まとめ
鉄 (Fe ((II)) は,有酸素条件下でパーキンソン病に関連するユニークなα-シヌクレイン (αS) オリゴーマーを誘導する. この鉄誘発 αS オリゴマーはβシート線維を形成せず,パーキンソン病の病理学における新しい役割を示唆している.
科学分野:
- 神経科学
- 生物化学
- 構造生物学
背景:
- 脳金属ディホメオスタシスとα-シヌクレイン (αS) の構造の変化はパーキンソン病 (PD) と関連しています.
- PDの病原性における金属とαS構造の相互作用は完全に理解されていません.
- N末端アセチル化αS (NAcαS) は,ヒトにおける生理学的に重要なαS形態である.
研究 の 目的:
- 鉄 (Fe ((II)) がNAc (αS) の結合と二次構造に及ぼす影響を調査する.
- PD に関連する αS 構造における鉄と金属の相互作用の役割を明らかにする.
主な方法:
- 二次構造を決定するための円形二重化 (CD) 分析.
- 伝送電子顕微鏡 (TEM) 画像処理により,タンパク質の集積を可視化します.
- 抗体特性 (オリゴマーの場合はA11,フィブリルの場合はOC).
- βシートフィブリル形成のためのチオフラビンT (ThT) 光測定法
主要な成果:
- Fe (II) はエアロビック条件下でPDに関連するNAcαSオリゴメルの形成を促進する.
- このオリゴーマーには,並列のβシートではなく,右折した反並列βシート構造がある.
- Fe (II) 誘発オリゴーマーがβシート線維に進行しないことは,TEMとOC抗体によって確認された.
- チオフラビンTは,この反パラレルコンフォマーと結合しません.
- オリゴメア状態は無酸素状態では存在しないので,O2の役割が強調される.
結論:
- 鉄を介した酸素化学は,αSを明確なオリゴメリック構造に駆り立てます.
- PD繊維とは異なるこの新種のオリゴメリック状態は,重要な生理学的または病理学的影響を及ぼす可能性があります.
- この鉄によるαS構造を理解することで,PDメカニズムに関する新しい洞察が得られます.
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