ネマトードC. elegansの微小管ベースのサイトプラズマモーターの特定
R J Lye1, M E Porter, J M Scholey
1Department of Molecular, Cellular and Developmental Biology, University of Colorado at Boulder 80309.
Cell
|October 23, 1987
まとめ
研究者らは,C. elegansで新しい微小管結合タンパク質を発見し,ダイネインとキネシンの両方の特性を有している. このユニークなモータータンパク質は,運動活動とATPase機能を示し,新しい分子モーターのクラスを示唆しています.
科学分野:
- 細胞生物学 細胞生物学
- 分子モーターは分子モーターです.
- バイオケミストリー バイオケミストリー
背景:
- 微小管は,細胞内輸送に関与する重要な細胞骨格の構成要素です.
- ダイネインやキネシンなどの運動タンパク質は,マイクロチューブルに沿って移動を容易にします.
- 新しい運動タンパク質を理解することは,細胞のメカニズムを明らかにする鍵です.
研究 の 目的:
- C. elegans. の新しい微小管結合タンパク質の特徴を特定する.
- このタンパク質の生化学的および機能的特性を調査する.
- 既知の運動タンパク質との関係を決定する.
主な方法:
- MgATPaseの活性を測定するための生化学分析.
- サクラロースグラデントとDEAE セファデックス染色を用いたコプリフィケーション研究.
- ATPとバナドATEの存在下で,紫外線下でのタンパク質分裂の分析.
- マイクロチューブルとアクソネムの運動性アッセイ.
主要な成果:
- このタンパク質はMgATPaseの活性を持ち,バナダート,N-エチルマレミド,AMP-PNPによって抑制され,ダイネインに似ています.
- 400 kDaのポリペプチド成分は,UV光によってATPとバナダートで割れます.
- タンパク質はATP依存のマイクロチューブルとアクソネームの転位を媒介し",プラス"の末尾が付いており,キネシンのような機能を持っています.
- 運動性は,ヴァナダート,N-エチルマレミド,ATP-ガンマ-S,ATP-ヴァナダート-UV分裂によって抑制され,キネシンと区別されます.
結論:
- 特定されたタンパク質は,新しい微小管のトランスロケータである.
- ダイネインのような性質とキネシンのような性質のユニークな組み合わせを示しています.
- この発見は,マイクロチューブルモータータンパク質の既知のレパートリーを拡大する.
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