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人間のmRNAの輸出機械は,mRNAの5'端に採用された
Hong Cheng1, Kobina Dufu, Chung-Sheng Lee
1Department of Cell Biology, Harvard Medical School, Boston, MA 02115, USA.
Cell
|December 28, 2006
まとめ
この研究は,TREX複合体が輸出のためのメッセンジャーRNA (mRNA) にどのように採用されるかを明らかにしています. キャップ結合タンパク質CBP80とAlyは,mRNAの5'端でこの重要な相互作用を媒介する.
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
- バイオケミストリー バイオケミストリー
背景:
- 核から細胞質へのメッセンジャーRNA (mRNA) 輸出は,遺伝子発現に不可欠である.
- 保存されたTREX (トランスクリプション・エクソン・ジャンクション・コンプレックス) 機構は,mRNAの輸出において重要な役割を果たします.
- mRNAへのTREX複合体の徴募の正確なメカニズムを理解することは,転写後の遺伝子調節を理解するために不可欠です.
研究 の 目的:
- TREX複合体がmRNAに採用されるメカニズムを解明する.
- TREXの採用に伴う主要な構成要素と相互作用を特定する.
- このプロセスにおける5'キャップとスプライシングの役割を決定する.
主な方法:
- バイオケミカルアッセイを用いてmRNAへのヒトTREX複合体の徴募を調査した.
- TREXの成分,特にAlyと5'キャップ結合タンパク質CBP80.0の相互作用を分析した.
- 5'キャップとスプライシングに対するTREX採用とmRNA輸出の依存度を評価した.
主要な成果:
- 人間のTREX複合体はmRNAの5'端に採用され,Aly成分は5'キャップに最も近い位置に置かれています.
- TREXの募集とmRNAの輸出は,どちらも5'キャップとスプライシングに依存しています.
- CBP80はTREXと直接結合し,この相互作用をAlyが媒介する.
結論:
- CBP80-Alyの相互作用は,mRNAの5'端にTREX複合体を勧誘する主なメカニズムである.
- この募集は,核孔を通して効率的なmRNAの輸出に不可欠です.
- これらの発見は,mRNAの輸出の5'から3'の方向性を支持し,以前の観察と一致しています.
関連する概念動画
Recombinant DNA
Overview
Nuclear Export of mRNA
Before mRNAs are exported to the cytoplasm, it is crucial to check each mRNA for structural and functional integrity. Eukaryotic cells use several different mechanisms, collectively known as mRNA surveillance, to look for irregularities in mRNAs. Irregular or aberrant mRNA are rapidly degraded by various enzymes. If a defective mRNA escapes the surveillance, it would be translated into a protein which would either be non-functional or not function properly. One of the primary irregularities in...
Regulated mRNA Transport
In eukaryotes, transcription and translation are compartmentalized; an mRNA is first synthesized in the nucleus and then selectively transported to the cytoplasm for protein synthesis. Before transport, a pre-mRNA undergoes several steps of post-transcriptional modifications including splicing, 5' capping, and the addition of a poly-adenine tail. Various proteins bind to the pre-mRNA during these modifications. The mRNA transport takes place with the help of multiple proteins playing specific...
Nuclear Export
The nucleus restricts several proteins within and allows others to pass. The restricted proteins possess a nuclear retention sequence or NRS, anchoring them to the nuclear lamins and preventing their transport to the cytosol. The non-restricted proteins, after their synthesis, are transported to their site of action, such as the cytosol or other organelles, with the help of nuclear export signals or NES.
NES are of three types- the canonical 10-residue long leucine-rich signal and other...
NES are of three types- the canonical 10-residue long leucine-rich signal and other...
Nuclear Export of mRNA
Before mRNAs are exported to the cytoplasm, it is crucial to check each mRNA for structural and functional integrity. Eukaryotic cells use several different mechanisms, collectively known as mRNA surveillance, to look for irregularities in mRNAs. Irregular or aberrant mRNA are rapidly degraded by various enzymes. If a defective mRNA escapes the surveillance, it would be translated into a protein which would either be non-functional or not function properly. One of the primary irregularities in...
Regulated mRNA Transport
In eukaryotes, transcription and translation are compartmentalized; an mRNA is first synthesized in the nucleus and then selectively transported to the cytoplasm for protein synthesis. Before transport, a pre-mRNA undergoes several steps of post-transcriptional modifications including splicing, 5' capping, and the addition of a poly-adenine tail. Various proteins bind to the pre-mRNA during these modifications. The mRNA transport takes place with the help of multiple proteins playing specific...

