MafBはEts-1の相互作用パートナーであり,Erythroidの分化を抑制するRepressorである
M H Sieweke1, H Tekotte, J Frampton
1European Molecular Biology Laboratory, Heidelberg, Federal Republic of Germany.
Cell
|April 5, 1996
まとめ
転写因子 MafB は Ets-1 と直接相互作用し, Ets-1 を阻害する.
科学分野:
- 分子生物学は分子生物学である.
- 細胞生物学 細胞生物学
- 遺伝学 遺伝学とは
背景:
- Ets-1は細胞の分化に不可欠な転写因子です.
- AP-1のようなタンパク質は,タンパク質とタンパク質の相互作用を通じて遺伝子発現を調節する.
- 骨髄単細胞細胞と赤血球細胞は,血液形成における重要な細胞タイプである.
研究 の 目的:
- Ets-1転写因子の直接相互作用パートナーを特定する.
- MafBとEts-1の相互作用が遺伝子調節と細胞分化に及ぼす機能的影響を調査する.
主な方法:
- イースト1ハイブリッドスクリーンは,Ets-1相互作用タンパク質を識別します.
- タンパク質の相互作用を確認するための共免疫プレシピテーションとドメインマッピング.
- 転写抑制を評価するためのレポーター遺伝子解析.
- 遺伝子の発現と分化への影響を評価するために,赤血球細胞系における過剰発現の研究.
主要な成果:
- AP-1のようなタンパク質であるMafBは,Ets-1の直接結合パートナーとして特定されました.
- MafBは,Ets-1のDNA結合ドメインに,そのベースまたはルシン-ジッパー領域を通して結合する.
- MafBは,Ets結合部位とトランスフリン受容体遺伝子の Ets-1媒介トランザクティベーションを抑制する.
- MafBの過剰発現は,増殖に影響を与えることなく,トランスファーリン受容体をダウン調節することによって,赤血球分化を抑制する.
結論:
- MafBは,Ets-1活動の負の調節剤として作用する.
- MafBとEts-1の相互作用は,血液形成中の系統特異遺伝子発現を調節する上で重要な役割を果たします.
- 転写因子の間の阻害相互作用は,細胞分化経路の制御に不可欠である.
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