イーストのサイクリンのようなタンパク質にとって不可欠なG1機能である.
H E Richardson1, C Wittenberg, F Cross
1Department of Molecular Biology, Research Institute of Scripps Clinic, La Jolla, California 92037.
Cell
|December 22, 1989
まとめ
芽生えた酵母細胞サイクルレギュレータであるサイクリン (CLN1,CLN2,CLN3) は,G1相進行に不可欠である. その機能は,おそらくCdc28キナーゼを活性化させるものですが,生物合成が停止すると急速に衰退し,細胞増殖を可能にします.
科学分野:
- 分子生物学は分子生物学である.
- 細胞生物学 細胞生物学
- イースト遺伝学 イースト遺伝学
背景:
- サイクリン (Cyclins) は,最初は細胞サイクル周期性のために海洋無脊椎動物で特定され,細胞分裂の重要な調節因子である.
- S. cerevisiae の3つの遺伝子 (CLN1,CLN2,DAF1/WHI1) は,サイクリンとホモロジーを示し,細胞サイクル進行に関与しています.
研究 の 目的:
- S. cerevisiaeの細胞サイクル進行におけるCLN1,CLN2,およびDAF1/WHI1遺伝子産物の重要な機能を調査する.
- Clnタンパク質の機能の相特異性と調節を決定する.
- Clnタンパク質がCdc28タンパク質キナーゼを活性化するという仮説を検証する.
主な方法:
- CLN1,CLN2,DAF1/WHI1の喪失が細胞サイクル進行に与える影響を評価するための遺伝子消去研究.
- CLN1の条件表現で,その本質的な機能のタイミングと持続時間を定義します.
- バイオシンセシスの停止後のClnタンパク質機能崩壊の分析.
主要な成果:
- CLN1,CLN2,およびDAF1/WHI1の変異による除去は,細胞サイクル停止を引き起こし,それらの発現は増殖を可能にします.
- Clnタンパク質の基本的機能は,細胞周期のG1段階に限られている.
- Clnタンパク質の機能は,合成が停止すると急速に衰退し,半減期が短いことを示唆しています.
結論:
- Clnタンパク質は,S. cerevisiae.のG1相進行に不可欠である.
- このデータは,Clnタンパク質が,G1からSへの移行に不可欠なCdc28タンパク質キナーゼを活性化するという仮説を裏付けている.
- DAF1/WHI1は,CLN1とCLN2との機能的な冗長性のためにCLN3に改名されました.
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