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Associated Chromosome Trap for Identifying Long-range DNA Interactions
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BCR-ABL誘発腫瘍生成は,GRB-2アダプタタンパク質のSH2ドメインとの直接相互作用によって媒介されます
A M Pendergast1, L A Quilliam, L D Cripe
1Department of Pharmacology, Duke University Medical Center, Durham, North Carolina 27710.
Cell
|October 8, 1993
まとめ
BCR-ABLオンコタンパク質は,チロシン177経由でGRB-2に結合し,白血病発症に不可欠なRasシグナリングを活性化します. この部位での変異はGRB-2の結合と変換を阻害し,Ras経路の腫瘍性作用を強調する.
科学分野:
- 分子生物学は分子生物学である.
- 腫瘍学 腫瘍学
- 細胞シグナル伝達 細胞信号伝達
背景:
- BCR-ABLオンコタンパク質はフィラデルフィア染色体陽性白血病を誘発する.
- Rasシグナル伝達経路の活性化は,細胞の変容に不可欠です.
研究 の 目的:
- BCR-ABLとGRB-2の相互作用を調査する.
- この相互作用がRas経路の活性化と細胞の変容における役割を決定する.
主な方法:
- タンパク質複合体を検出するための共免疫プレシピテーション.
- タイロシン177.を変化させるサイト指向型変異.
- 主要骨髄とラット1の線維芽細胞における細胞変容検査.
主要な成果:
- BCR-ABLは,体内でGRB-2と複合体を形成する.
- GRB-2は,BCR-ABL上の酸化チロシン177 (Y177) に結合する.
- Y177からフェニララニンへの変異はGRB-2結合とRas活性化を無効化する.
- BCR-ABL Y177F変異体は,細胞の変容に障害を示しています.
結論:
- Y177によって媒介されるBCR-ABL-GRB-2相互作用は,Ras経路の活性化に不可欠である.
- Ras経路の活性化は,BCR-ABL誘発腫瘍形成の重要なメカニズムである.
- GRB-2は,正常な発達を超えた腫瘍発生において重要な役割を果たします.
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