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蜘蛛の糸タンパク質の自己組み立ては,pH感度の高いリレーによって制御されます
Glareh Askarieh1, My Hedhammar, Kerstin Nordling
1Department of Chemistry, Oslo University, 1033 Blindern, 0315 Oslo, Norway.
Nature
|May 14, 2010
まとめ
クモの糸のタンパク質,スパイドロインは,液体状態に保存されます. 蜘蛛のアミノ末端領域 (NT) は,自己組み立てを制御し,過早な集積を防止し,の形成を可能にします.
科学分野:
- バイオケミストリー バイオケミストリー
- マテリアルサイエンス 材料科学
- 構造生物学 構造生物学とは
背景:
- クモの糸は,スパイドロインから生産された高性能バイオポリマーであり,液体ドープとして保存されます.
- スパイドロインは重複するセグメントと,シルク特性にとって重要な非重複ドメインを保存しています.
- 自己組み立て前に早期のスパイドロイン集積を防ぐメカニズムは不明である.
研究 の 目的:
- アミノ末端ドメイン (NT) がスパイドロインの自己組織化と結合における役割を調査する.
- スパイドロインの貯蔵とシルク形成の分子詳細を解明する.
- 蜘蛛が糸の生産中にタンパク質の集積をどのように制御するのかを理解するために.
主な方法:
- NTドメインの構造を決定するX線結晶学.
- NTドメインを組み込んだエンジニアリングミニスパイドロイン.
- 異なるpHでエンジニアリングされたスパイドロインの自己組み立てと集積特性を評価する.
主要な成果:
- NTドメインは,ユニークな構造を持つ反並列の5ヘリックスバンドルのホモジマーを形成します.
- NTをミニスパイドロインに組み込むことで,pH6.3の周囲でpHに依存した自己組み立てが可能になる.
- NTは中性pH (pH7以上) での集積を遅らせ,pHが低いときの集積を加速する.
結論:
- NTドメインは分子スイッチとして作用し,スパイドロインの組立を調節します.
- NTを含むリレーのようなメカニズムは,貯蔵と挤出の間にスパイドロインの集積を制御します.
- NTの二次構造と電荷分布は,スパイドロイン全体で保存される可能性が高い.
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