哺乳類のスプライシングファクターU2AFのクローン化とドメイン構造
P D Zamore1, J G Patton, M R Green
1Department of Biochemistry and Molecular Biology, Harvard University, Cambridge, Massachusetts 02138.
Nature
|February 13, 1992
まとめ
研究者らは,U2 snRNP補助因子65 (U2AF65) の大きなサブユニットのための補完的なDNAクローンを分離し,発現した. この重要なスライシングファクタには,RNA結合とスライシングに特異なドメインが含まれています.
科学分野:
- 分子生物学は分子生物学である.
- RNA スプライシングメカニズム
- 遺伝子発現の規制について
背景:
- プレメッセンジャーRNA (mRNA) スプライシングは,遺伝子発現における重要なプロセスです.
- U2 snRNP補助因子 (U2AF) は,哺乳類のmRNAスプライシングに不可欠である.
- U2AFは大きなサブユニット (U2AF65) と小さなサブユニットで構成されています.
研究 の 目的:
- U2AF (U2AF65) の大きな亜単位をコードする補完DNA (cDNA) を分離し,発現させる.
- U2AF65タンパク質の機能ドメインを特徴付けるために.
- プレ-mRNAスプライシングにおけるU2AF65の役割の分子基礎を理解するために.
主な方法:
- 補完的なDNA (cDNA) のクローンと分離.
- U2AF65タンパク質のインビトロ発現.
- U2AF65.65の機能領域解析について
主要な成果:
- U2AF65大サブユニットをコードするcDNAクローンが成功裏に分離され,in vitroで発現されました.
- U2AF65タンパク質には2つの異なる機能ドメインが含まれています.
- 1つのドメインは,リボヌクレオプロテイン-コンセンサス配列 (RNP-CS) ドメインを介して配列特異のRNA結合を示す.
- もう一方のドメインは,スプライシングに不可欠なアルギニン/セリンに富んだモチーフを特徴付けているが,直接的なプレ-mRNA結合はしていない.
結論:
- 孤立したU2AF65cDNAは,特徴的なドメインを持つ機能性タンパク質をコードする.
- RNP-CSドメインは,配列特異のRNA結合を媒介する.
- アルギニン/セリンの豊富なモチーフは,U2AF65.5のスプライシング活動に不可欠です.
- これらの発見は,pre-mRNA splicingにおけるU2AF65の分子メカニズムについての洞察を提供します.
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