マルチドメイン型選択は,U2AFによるプレ-mRNAスプライシング制御の基礎となっている
Cameron D Mackereth1, Tobias Madl, Sophie Bonnal
1Institute of Structural Biology, Helmholtz Zentrum München, Ingolstädter Landstrasse 1, 85764 Neuherberg, Germany.
Nature
|July 15, 2011
まとめ
人間のU2補助因子65 (U2AF65) タンパク質は,RNAを結合するために2つの異なる形状を使用し,分子リオスタットとして作用します. この形状選択メカニズムは,U2 snRNPの採用を制御することによって,pre-mRNAのスプライシング効率を調節する.
科学分野:
- 分子生物学は分子生物学である.
- バイオケミストリー バイオケミストリー
- 遺伝学 遺伝学とは
背景:
- マルチドメインタンパク質は,独立したモジュールを介して特定のリガンドを認識し,細胞機能に不可欠です.
- リガンド認識中に複数のドメインがダイナミックに相互作用する方法を理解することは不可欠です.
- U2補助因子65 (U2AF65) タンパク質は,ポリピリミジン経路RNAを認識することによって,プレ-mRNAスプライシングにおいて重要な役割を果たします.
研究 の 目的:
- U2AF65が3'-splice-site-associated polypyrimidine tract RNAを認識する分子メカニズムを解明する.
- U2AF65のドメインダイナミクスのプレ-mRNAスプライシングの調節における役割を調査する.
主な方法:
- U2AF65.5によるポリピリミジン経路RNA認識の分子機構を研究しました.
- U2AF65の形状とRNA結合を特徴付けるために,構造的および機能的測定を用いた.
- 変異がコンフォメーションバランスとスプライシング活動に与える影響を調査した.
主要な成果:
- U2AF65のタンデムRNA認識モチーフドメインは,ポリピリミジン経路の親和性に基づいて,明確な閉じたおよび開いた形状を採用します.
- RNA配列の変異は,これらの形状の間の集団のシフトを誘導する.
- 構成均衡は分子リオスタットとして作用し,RNA特性をU2 snRNPのリクルート効率と相関させます.
結論:
- U2AF65は,変性RNAモチーフの認識のためにコンフォメーション選択メカニズムを使用しています.
- このメカニズムは,ポリピリミジン経路の特性を,スプライソーム組立効率と定量的に結びつける.
- 協力的な多領域構成選択は,分子認識における一般的原則であるかもしれない.
関連する概念動画
RNA Splicing
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RNA Splicing
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Chromatin Structure Regulates pre-mRNA Processing
In eukaryotic cells, nascent mRNA transcripts need to undergo many post-transcriptional modifications to reach the cell cytoplasm and translate into functional proteins. For a long time, transcription and pre-mRNA processing were considered two independent events that occur sequentially in the cell. However, it has now been well established that transcription and pre-mRNA processing are two simultaneous processes that are precisely regulated inside the cell.
The chromatin structure, especially...
The chromatin structure, especially...
Alternative RNA Splicing
Alternative RNA splicing is the regulated splicing of exons and introns to produce different mature mRNAs from a single pre-mRNA. Unlike in constitutive splicing where a single gene produces a single type of mRNA, alternative splicing allows an organism to produce multiple proteins from a single gene and plays an important role in protein diversity.
There are five types of alternative RNA splicing that vary in the ways the pre-mRNA segments are removed or retained in the mature mRNA. The first...
There are five types of alternative RNA splicing that vary in the ways the pre-mRNA segments are removed or retained in the mature mRNA. The first...
Pre-mRNA Processing: RNA Splicing
Splicing is the process by which eukaryotic RNA is edited before its translation into protein. The RNA strand transcribed from eukaryotic DNA is called the primary transcript. The primary transcripts that become mRNAs are called precursor messenger RNAs (pre-mRNAs). Eukaryotic pre-mRNA contains alternating sequences of exons and introns. Exons are nucleotide sequences that code for proteins, whereas introns are the non-coding regions. In RNA splicing, introns are removed and exons are bonded...
Alternative RNA Splicing
Alternative RNA splicing is the regulated splicing of exons and introns to produce different mature mRNAs from a single pre-mRNA. Unlike in constitutive splicing where a single gene produces a single type of mRNA, alternative splicing allows an organism to produce multiple proteins from a single gene and plays an important role in protein diversity.
There are five types of alternative RNA splicing that vary in the ways the pre-mRNA segments are removed or retained in the mature mRNA. The first...
There are five types of alternative RNA splicing that vary in the ways the pre-mRNA segments are removed or retained in the mature mRNA. The first...


