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分裂酵母mod5pは, tea1pを細胞の先端に固定することによって,偏向的な成長を調節する
Hilary A Snaith1, Kenneth E Sawin
1Wellcome Trust Centre for Cell Biology, Institute of Cell and Molecular Biology, Swann Building, University of Edinburgh, Mayfield Road, Edinburgh EH9 3JR, UK.
Nature
|June 6, 2003
まとめ
新しい皮質タンパク質であるMod5pは,分断酵母における細胞先端に極性タンパク質 tea1pを固定するのに不可欠です. この相互作用は,適切な細胞の分極化と成長を保証し,tea1pとmod5pの間のポジティブなフィードバックループを示唆します.
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:
- 微小管は,真核細胞の極性における鍵であり,エンド結合タンパク質と細胞皮質と相互作用する.
- 分裂酵母 (Schizosaccharomyces pombe) の微小管と茶1pは,細胞の形状と二極化した成長を調節する.
- Tea1pは,成長するマイクロチューブルプラス末端を介して細胞の先端に輸送され,成長を調整するために皮質にアンカーされます.
研究 の 目的:
- tea1pダイナミクスと細胞の極性調節に関与する新しいタンパク質を特定し,特徴づけること.
- tea1p媒介の極化経路における,新たに特定された皮質タンパク質mod5pの役割を明らかにする.
主な方法:
- 分裂酵母変異体 (mod5Δとtea1Δ) の遺伝子解析.
- タンパク質の局所化と細胞形態の観察のための顕微鏡.
- タンパク質の改変 (プレニル化) を決定する生化学分析.
主要な成果:
- Mod5pは tea1pのダイナミックな行動と皮質の固定を調節する.
- mod5Δ細胞では,tea1pは細胞頂部に到達するが,固定することはできず,蓄積を減少させる.
- Mod5pはプレニル化され,細胞先のプラズマ膜に局所され,その局所化は tea1p に依存する.
結論:
- Mod5pは tea1pの適切な固定と細胞の先端に蓄積するために不可欠です.
- Tea1pとmod5pは,微小管媒介細胞の極性を調節するポジティブフィードバックループで機能する可能性が高い.
- この相互作用は,細胞の形状を維持し,分裂酵母の成長を誘導するために重要である.
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