dsxプレ-mRNAの性別スプライシングとポリアデニレーションには,in vitroでは特異的にtra-2タンパク質に結合する配列が必要です
1Harvard University, Department of Biochemistry and Molecular Biology, Cambridge, Massachusetts 02138.
Cell
|May 17, 1991
まとめ
トランスフォーマー-2 (tra-2) タンパク質は,ダブルセックス (dsx) 前mRNAの特定の部位に結合する. この結合は,女性特異のスプライシングとポリアデニレーションに不可欠であり,tra-2がdsxRNA処理を正に調節することを示しています.
科学分野:
- 分子生物学は分子生物学である.
- 遺伝学 遺伝学とは
- 発達生物学 発達生物学とは
背景:
- ドロソフィラの体性性判定は,代替的なプレ-mRNA処理によって制御される.
- トランスフォーマー-2 (tra-2) タンパク質は,双性 (dsx) 前mRNAの女性特有の処理に不可欠です.
- RNA処理におけるtra-2の調節作用の正確なメカニズムは不明である.
研究 の 目的:
- tra-2タンパク質が dsx 前mRNA処理を調節する分子機構を調査する.
- dsx pre-mRNA.tra-2の結合部位を特定するために
- 女性特有のRNA処理におけるこの結合部位の機能を決定する.
主な方法:
- エシェリキヤ大腸におけるtra-2タンパク質の生成.
- トラ-2特異性を決定するRNA結合測定法.
- dsxプリ-mRNA処理の分析 in vivoおよびin vitro.
主要な成果:
- 再結合型tra-2タンパク質は,dsx pre-mRNAの女性特異的なエクソン内の繰り返し配列に特異的に結合する.
- この結合部位は,女性特有のスプライシングとdsxのポリアデニレーションの両方に不可欠です.
- 特定された結合部位には,13の核酸リピートの6つのコピーが含まれています.
結論:
- トランスフォーマー-2 (tra-2) は,ダブルセックス (dsx) プリ-mRNA処理のポジティブレギュレーターとして作用します.
- tra-2がdsxプリ-mRNAの繰り返し要素に特異的に結合することは,その調節機能に極めて重要です.
- これらの発見は,転写後のレベルでのドロソフィラの性別決定の重要なメカニズムを明らかにします.
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