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GAP関連タンパク質p190をコードするcDNAの分子クローン化: rasから核へのシグナル伝達経路への影響
J Settleman1, V Narasimhan, L C Foster
1Whitehead Institute for Biomedical Research, Massachusetts Institute of Technology, Cambridge 02142.
Cell
|May 1, 1992
まとめ
研究者は,刺激された細胞でras GTPase活性化タンパク質 (GAP) と複合するタンパク質,p190を特定しました. このタンパク質には,GTPase調節と転写抑制における役割を示唆するドメインがあり,潜在的にras信号を核遺伝子発現と結びつける可能性があります.
科学分野:
- 分子生物学は分子生物学である.
- 細胞シグナリング 細胞シグナリング
- 遺伝学 遺伝学とは
背景:
- Ras GTPase活性化タンパク質 (GAP) は,ras信号伝達経路の調節に重要な役割を果たしています.
- p190タンパク質は,刺激された細胞および変形した細胞でras GAPと複合体を形成することが観察されています.
研究 の 目的:
- p190タンパク質をクローンし,特徴づけること.
- 細胞信号伝達におけるp190の機能領域と潜在的な役割を明らかにする.
主な方法:
- p190タンパク質をコードする補完DNA (cDNA) のクローン化.
- ホモログドメインを特定するために,予測されたタンパク質配列のバイオ情報分析.
主要な成果:
- p190タンパク質配列は,既知のタンパク質と有意なホモロジーを持つ3つの異なるドメインを含んでいます.
- N端末ドメインは,GTPaseモチーフとのホモロジーを示します.
- C端末ドメインは,既知のGAPタンパク質に類似しており,中央ドメインは,転写抑制剤に同型である.
結論:
- p190は,GTPase調節と転写抑制における二重機能性を示唆する構造的特徴を有しています.
- p190は信号媒介者として作用し,ras GTPase活性化タンパク質からの信号を核に伝達する.
- この相互作用は,特定の細胞遺伝子の発現に影響を与え,細胞プロセスに影響を与える可能性があります.
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