単一のスライセオソームの秩序的かつダイナミックなアセンブリ
Aaron A Hoskins1, Larry J Friedman, Sarah S Gallagher
1Department of Biochemistry and Molecular Pharmacology, Howard Hughes Medical Institute, University of Massachusetts Medical School, Worcester, MA 01605, USA.
Science (New York, N.Y.)
|March 12, 2011
まとめ
研究者は,スプライセソームの組み立てをリアルタイムで追跡し,プレ-mRNAからイントロンを除去するための連続的かつ可逆的なプロセスを明らかにしました. このオーダーされた経路は,代替スプライシングの規制に影響を与えます.
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:
- スプライセソームは,遺伝子発現のための重要な分子機構であり,前伝達 RNA (前mRNA) からイントロンの除去を触媒化する.
- スプライソーム組立のダイナミクスを理解することは,遺伝子調節と代替スプライシングの基礎となるメカニズムを明らかにする鍵です.
研究 の 目的:
- 単一のスプライソームのリアルタイムアセンブリを視覚化および分析する.
- プレ-mRNA.spliceosomalサブコンプレックスとの関連性の順序とダイナミクスを決定する.
- スプライシング経路へのプレ-mRNAのコミットメントポイントを調査する.
主な方法:
- 精密な実験制御のために酵母遺伝子工学を用いた.
- 分子相互作用を調査するために化学生物学ツールを使用しました.
- 多波長光顕微鏡を用いて,全細胞抽出物における単分子可視化をリアルタイムで実現した.
主要な成果:
- spliceosomalサブコンプレックスが,順序のある経路を通って,序列的にpre-mRNAに組み合わされることが示されました.
- それぞれのサブコンプレックスとの関連が逆行可能なステップであることを発見しました.
- pre-mRNAのスプライシングへのコミットメントは,初期のイベントではなく,アセンブリが進むにつれて漸進的に増加することを確立しました.
結論:
- スプライソーム組立は,動的,秩序ある,および可逆的なプロセスです.
- 段階的な組み立ては,代替スプライシングの規制に影響を与えます.
- 開発された実験的アプローチは,近親細胞環境で他の複雑な分子機械を研究するための強力なツールを提供します.
関連する概念動画
01:32RNA 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...
01:32RNA 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...
02:50Spindle Assembly
Spindle assembly occurs through three, often coexisting, pathways – the centrosome-mediated pathway, the chromatin-mediated pathway, and the microtubule-mediated pathway – collectively contributing to form a robust spindle apparatus.
In most cells, centrosomes are the primary microtubule nucleation centers. In the centrosome-mediated pathway, the G2-prophase transition triggers centrosome maturation and increased microtubule nucleation. Progressive nucleation results in a microtubule array...
In most cells, centrosomes are the primary microtubule nucleation centers. In the centrosome-mediated pathway, the G2-prophase transition triggers centrosome maturation and increased microtubule nucleation. Progressive nucleation results in a microtubule array...
02:50Spindle Assembly
Spindle assembly occurs through three, often coexisting, pathways – the centrosome-mediated pathway, the chromatin-mediated pathway, and the microtubule-mediated pathway – collectively contributing to form a robust spindle apparatus.
In most cells, centrosomes are the primary microtubule nucleation centers. In the centrosome-mediated pathway, the G2-prophase transition triggers centrosome maturation and increased microtubule nucleation. Progressive nucleation results in a microtubule array...
In most cells, centrosomes are the primary microtubule nucleation centers. In the centrosome-mediated pathway, the G2-prophase transition triggers centrosome maturation and increased microtubule nucleation. Progressive nucleation results in a microtubule array...
02:41Protein Complex Assembly
Proteins can form homomeric complexes with another unit of the same protein or heteromeric complexes with different types. Most protein complexes self-assemble spontaneously via ordered pathways, while some proteins need assembly factors that guide their proper assembly. Despite the crowded intracellular environment, proteins usually interact with their correct partners and form functional complexes.
Many viruses self-assemble into a fully functional unit using the infected host cell to...
Many viruses self-assemble into a fully functional unit using the infected host cell to...
02:41Protein Complex Assembly
Proteins can form homomeric complexes with another unit of the same protein or heteromeric complexes with different types. Most protein complexes self-assemble spontaneously via ordered pathways, while some proteins need assembly factors that guide their proper assembly. Despite the crowded intracellular environment, proteins usually interact with their correct partners and form functional complexes.
Many viruses self-assemble into a fully functional unit using the infected host cell to...
Many viruses self-assemble into a fully functional unit using the infected host cell to...