LAG-3は,C. elegans Notch経路における推定転写活性化剤である
1Howard Hughes Medical Institute and Department of Biochemistry, University of Wisconsin-Madison, 53706, USA.
Nature
|June 1, 2000
まとめ
研究者らは,発育と疾患におけるNotchシグナル伝達に不可欠なタンパク質であるLAG-3を特定した. LAG-3は,C. elegans.のGLP-1およびLIN-12経路機能に不可欠な転写活性化剤として作用する.
科学分野:
- 分子生物学は分子生物学である.
- 発達生物学 発達生物学について
- 遺伝学 遺伝学とは
背景:
- ノッチ・シグナリングは,成長や分化などの重要な発達過程を調節する.
- アバラント・ノッチ・シグナリングは,がんや脳卒中を含む人間の病気と関連しています.
- Notch経路のメカニズムは,受容体分裂,細胞内ドメインの核転位,CSLタンパク質への結合を含む.
研究 の 目的:
- ノッチ信号伝達経路に関与する新しいタンパク質を特定する.
- ノッチ・シグナル伝達における新たに特定されたLAG-3タンパク質の機能を明らかにする.
- Notch.によって規制される開発プロセスにおけるLAG-3の役割を理解する.
主な方法:
- 酵母とインビトロ複合形成アッセイ.
- 信号伝達に影響を与える変異性受容体の分析.
- Caenorhabditis elegans.におけるRNA干渉 (RNAi) について
- 酵母における転写活性化の評価.
- C. elegansのMyc-タグされたLAG-3を用いた細胞下局所化研究.
主要な成果:
- LAG-1とノッチ細胞内領域との三元複合体を形成するグルタミンに富んだタンパク質であるLAG-3の識別.
- 信号伝導を廃止する変異受容体は,この複合体を形成することができません.
- LAG-3の活動は,C. elegans.におけるGLP-1とLIN-12のシグナル伝達に不可欠である.
- LAG-3は強力な転写活性化剤として機能します.
- MycタグのLAG-3は,主にC. elegans細胞の核に定着しています.
結論:
- LAG-3はNotch信号経路の重要な構成要素である.
- ノッチ・シグナリングは,LAG-3をターゲット・プロモーターに勧誘することで,その機能を促進する.
- LAG-3は,GLP-1とLIN-12信号伝達の効果を媒介する転写活性化剤として作用します.
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