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海の卵から精製された新型ヘトロトリメルキネシン関連タンパク質

D G Cole¹, S W Chinn, K P Wedaman

¹Section of Molecular and Cellular Biology, University of California, Davis 95616.

|November 18, 1993

まとめ

研究者らは,新種のキネシン関連タンパク質 (KRP) コンプレクスを,ヒゲの卵から精製した. このKRP ((85/95)) 複合体はマイクロチューブルに沿って移動し,細胞内輸送の研究を進めています.

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.
タンパク質生化学タンパク質生化学

背景:

キネシン重鎖およびキネシン関連ポリペプチド (KRPs) は,細胞内輸送に不可欠な運動タンパク質です.
以前の研究で,海の卵から採取したトリメア型マイクロチューブル結合およびバンドリングタンパク質,KRP (85/95) が確認された.

研究の目的:

KRP (85/95) 複合体のサブユニットをコードする遺伝子を特定する.
KRP (85/95) のネイティブマルチメリック状態と運動活動を特徴づけるために.

主な方法:

パンキネシンペプチド抗体を用いて,海の卵シトソールからKRP (85/95) を浄化する.
85Kモノクローナル抗体を用いてトリメア複合体の免疫プレシピテーション.
精製されたKRP (85/95) によって微小管の結合,束縛,方向移動の分析.

主要な成果:

キネシン関連遺伝子は,KRP (85/95) の85Kおよび95Kサブユニットをコードすることが判明しました.
KRP (85/95) タンパク質は,シトゾールからトリメア複合体として免疫的に成功しました.
浄化されたKRP (85/95) は,微小管のプラス端に向かって動きを示した.

結論:

この研究は,KRP (85/95) の85Kおよび95Kサブユニットの遺伝的基礎を特定しています.
KRP (85/95) は,宿主細胞から原生マルチメリック形態で浄化された最初のキネシン関連モーターです.
発見は,細胞内輸送におけるキネシン関連モーターの構造と機能に関する洞察を提供します.

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