メディン19-36から派生したペプチドのX線結晶構造における相互浸透立方体
William J Howitz1, Michał Wierzbicki1, Rudy William Cabanela1
1Department of Chemistry and Department of Pharmaceutical Sciences, University of California, Irvine, Irvine, California 92697-2025, United States.
Journal of the American Chemical Society
|August 21, 2020
まとめ
研究者はメディンペプチドの組成を調査し,金属イオンで形成された相互に浸透する立方体の新しい構造を明らかにしました. この発見はペプチドベースの金属有機フレームワーク (MOF) に新しい道を開きます.
科学分野:
- 超分子化学
- バイオマテリアル科学
- 構造生物学
背景:
- アミロイド原性ペプチドおよびAβ,ヒトの小島型アミロイドポリペプチドおよびタウなどのタンパク質は,繊維,ナノシート,リボン,ナノチューブなどの様々な超分子組成を形成することが知られている.
- 血管の蓄積に関与するペプチドであるメディンの超分子組成は,ほとんど未調査のままである.
- ペプチドの自己組み立てを理解することは,新しい生体材料を開発し,病気のメカニズムを理解するために不可欠です.
研究 の 目的:
- メディンのペプチドの 超分子組成を調べるためだ
- メディンペプチド組の構造特性を決定する.
- 新しいフレームワークを形成するペプチド-金属イオン相互作用の可能性を調査する.
主な方法:
- X線結晶学を用いて,メディン19−36領域から派生した周期性βシートペプチドの構造を決定した.
- 二価金属イオンの存在下でのペプチドの自己組み立ての分析.
- 結果となる超分子構造の特徴化.
主要な成果:
- 新しい超分子組成の 相互浸透する立方体が発見されました
- 各立方体のエッジは単一のペプチドで構成され,各頂点には二価金属イオンがある.
- 構造は,ペプチドリガンドを持つ金属有機フレームワーク (MOF) として分類することができます.
結論:
- Glu または Asp の残留物を含んだペプチドは,β-ヘアピン構造に事前に組織され,金属イオンのリガンドとして作用する.
- これらのペプチド-金属イオン組は,金属-有機フレームワーク (MOF) を形成することができます.
- この研究はペプチドの自己組み立てに関する理解を広げ,ペプチドベースのMOFの新しいクラスを導入します.
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