下位エウカリオットにおけるSH2シグナル伝達:ダクトヨステリウムにおける茎細胞の分化を調節するSTATタンパク質
T Kawata1, A Shevchenko, M Fukuzawa
1Department of Biology, University College London, United Kingdom.
Cell
|June 13, 1997
まとめ
TTGA結合因子 (Dictyosteliumの細胞分化の主な調節因子) は,STATタンパク質として特定されています. この発見は,多細胞生物におけるSH2信号伝達経路の初期の進化的起源を明らかにしています.
科学分野:
- 細胞および分子生物学
- 発達生物学 発達生物学とは
- 進化生物学の進化生物学について
背景:
- TTGA結合因子は,Dictyosteliumの細胞分化を調節し,活性化剤と抑制剤の両方として作用します.
- DIF (差別化誘発因子) は,塩素化ヘキサフェノンで,ストーク前細胞の分化を引き起こします.
研究 の 目的:
- TTGA結合因子の分子性質を特定するために.
- この転写調節体の作用メカニズムと進化的意義を解明する.
主な方法:
- TTGA結合因子を特徴付けるための生化学的分析.
- フォスフォチロジンとSH2ドメインを含むタンパク質-タンパク質相互作用の分析.
- 哺乳類のインターフェロン刺激反応要素を用いたDNA結合研究.
主要な成果:
- TTGA結合因子はSTATタンパク質として特定されました.
- それは,メタゾアンのSTATsに似た,相互のフォスフォチロジン-SH2ドメインの相互作用を通じて機能します.
- この因子は,哺乳類のインターフェロン刺激反応要素に特異的に結合する.
- SH2ドメインはSaccharomyces cerevisiaeに存在しないため,多細胞性の初期の進化を示唆しています.
結論:
- STATタンパク質とSH2シグナル伝達経路は古くから存在し,多細胞生物の進化の初期に発生したものです.
- これらの経路は,細胞間通信を容易にする上で重要な役割を果たした可能性がある.
- TTGA結合因子は,遺伝子発現と細胞運命を調節する保存されたメカニズムを表しています.
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