2つの異なる経路により,哺乳類のコヘシンがプロフェーズにおける染色体腕から,アナフェーズにおけるセントロメアから除去されます
I C Waizenegger1, S Hauf, A Meinke
1Research Institute of Molecular Pathology, Vienna, Austria.
Cell
|November 18, 2000
まとめ
脊椎動物のアナファース制御は,酵母とは異なり,セントロメアでのコヘシンSCC1分裂を伴う. このプロセスはセパリンプロテアゼの活性に依存し,適切な細胞分裂を保証します.
科学分野:
- 細胞生物学 細胞生物学
- 分子生物学は分子生物学である.
- 遺伝学 遺伝学とは
背景:
- 酵母におけるアナフェーズ進行にはコヘシン分裂が必要ですが,脊椎動物におけるメカニズムは不明です.
- 脊椎動物のコヘシンは通常,酵母と異なり,アナフェーズ前に染色体から解離する.
研究 の 目的:
- 脊椎動物におけるアナフェーズ発症を制御するメカニズムを調査する.
- 脊椎動物のアナファゼにおけるコヘシンSCC1分裂の役割を決定する.
主な方法:
- 使用されたクセノプスの卵のエキスとヒトの細胞系.
- タンパク質の相互作用と酵素活性を研究するために,免疫プレシピテーションを用いた.
- 細胞サイクル中のSCC1分裂とセパリン活性を分析した.
主要な成果:
- 残留コヘシンSCC1は,アナフェーズの発生までヒトセンターメアに留まります.
- XenopusエキスのSCC1分裂は,アナフェーズ促進複合体と分離に依存しています.
- セパリンは,SCC1の分裂に十分なプロテアゼ活性を示し,セパリンの破壊とセパリンの分裂によって調節されます.
結論:
- 脊椎動物のアナファゼは,プロファゼの間に染色体腕からコヘシンを除去するための分裂独立経路を含む.
- 分離依存の経路は,メタフェーズからアナフェーズへの移行時にセントロメリックコヘシンを割る.
- これは,酵母と比較して脊椎動物の細胞サイクル制御のための明確なメカニズムを強調しています.
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