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Bacterial Phylum Spirochaetes
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mdm-2腫瘍遺伝子の製品は,p53タンパク質と複合体を形成し,p53-媒介トランザクティベーションを阻害する
J Momand1, G P Zambetti, D C Olson
1Department of Molecular Biology, Lewis Thomas Laboratory, Princeton University, New Jersey 08544-1014.
Cell
|June 26, 1992
まとめ
マウリン双分2 (mdm-2) 腫瘍遺伝子の製品は,p53タンパク質に結合する. この相互作用はp53の腫瘍抑制活性を抑制し,細胞の腫瘍発生の可能性に影響を与えます.
科学分野:
- 分子生物学は分子生物学である.
- 腫瘍学 腫瘍学
- 細胞生物学 細胞生物学
背景:
- p53タンパク質は,重要な腫瘍抑制剤である.
- ネズミのダブルミニート2 (mdm-2) 遺伝子は,過剰発現すると腫瘍発生の可能性を高めるタンパク質をコードする.
- mdm-2は,推定的な転写因子である.
研究 の 目的:
- 細胞のフォスフォタンパク質を特徴付け,p53.3と複合する細胞のフォスフォタンパク質を特定する.
- mdm-2がp53のトランザクティベーションを調節できるかどうかを調査する.
- mdm-2/p53相互作用の機能的結果を決定する.
主な方法:
- p53.3と複合する90kdのフォスフォタンパク質 (p90) の浄化と特徴付け.
- mdm-2遺伝子の産物としてp90の識別.
- 筋肉のクレアチンキナーゼ遺伝子のp53-応答性要素と,ワイルド型p53とmdm-2を発現するプラズミッドを用いた共伝染アッセイ.
主要な成果:
- 90kdのフォスフォタンパク質を浄化し,mdm-2遺伝子の産物として特定しました.
- mdm-2製品は,変異体と野生型のp53の両方と緊密な複合体を形成します.
- mdm-2の過剰発現は,p53-応答要素のp53-媒介トランザクティベーションを阻害した.
結論:
- mdm-2腫瘍遺伝子の製品は,p53タンパク質と直接相互作用する.
- mdm-2はp53の転写活動を阻害する.
- この相互作用は,mdm-2がp53.3を無活性化することで腫瘍発生に寄与するメカニズムを示唆しています.
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