Saccharomyces cerevisiaeからのイントロン・ラリアット・スプリセソームの構造
Ruixue Wan1, Chuangye Yan1, Rui Bai1
1Beijing Advanced Innovation Center for Structural Biology, Tsinghua-Peking Joint Center for Life Sciences, School of Life Sciences and School of Medicine, Tsinghua University, Beijing 100084, China.
Cell
|September 19, 2017
まとめ
この研究は,イントロン・ラリアット・スプリセソーム (ILS) 複合体の冷凍電子顕微鏡構造を明らかにした. 特定のスプライシング因子の放出とPrp43の結合を詳細に説明し,ILSの解体メカニズムを提案した.
科学分野:
- 分子生物学
- 構造生物学
- 生物化学
背景:
- イントロン・ラリアット・スプライセソーム (ILS) 複合体は,mRNA前スプライシングに不可欠である.
- ILSの解体を理解することは,スプライシングサイクルの最終段階を理解するための鍵です.
研究 の 目的:
- 高解像度冷凍電子顕微鏡でSaccharomyces cerevisiae ILS複合体の構造を決定する.
- ILSの分解を制御する分子メカニズムを解明する.
主な方法:
- ILS複合体の構造を得るために,冷凍電子顕微鏡 (cryo-EM) が使用された.
- 構造的分析は,解放された要素と残りの要素の相互作用に焦点を当てた.
主要な成果:
- 構造は,結合されたエクソンが解離している間,イントロン・ラリアートがまだ結合していることを示しています.
- 活性部位からPrp17,Prp18,Cwc21,Cwc22のような重要な結合因子が放出されます.
- Prp43は,U6 snRNAの近くにあるスプライソーム周辺でSyf1と結合する.
- Ntr1/Spp382とNtr2はそれぞれSnu114とPrp8と相互作用し,複合体の構造に寄与する.
結論:
- 決定された構造は,ILSの分解プロセスに関する洞察を提供します.
- 特定のタンパク質-RNAとタンパク質の相互作用は,スプライシングの最終段階のメカニズムを示唆しています.
関連する概念動画
RNA Splicing
60.8K
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...
60.8K
Pre-mRNA Processing: RNA Splicing
7.1K
7.1K
Alternative RNA Splicing
25.4K
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...
25.4K
Alternative RNA Splicing
5.3K
5.3K
Chromatin Structure and RNA Splicing
3.5K
3.5K
pre-mRNA Processing
57.7K
In eukaryotic cells, transcripts made by RNA polymerase are modified and processed before exiting the nucleus. Unprocessed RNA is called precursor mRNA or pre-mRNA to distinguish it from mature mRNA.
Once about 20-40 ribonucleotides have been joined together by RNA polymerase, a group of enzymes adds a “cap” to the 5’ end of the growing transcript. In this process, a 5’ phosphate is replaced by modified guanosine that has a methyl group attached to it (7-Methyl...
Once about 20-40 ribonucleotides have been joined together by RNA polymerase, a group of enzymes adds a “cap” to the 5’ end of the growing transcript. In this process, a 5’ phosphate is replaced by modified guanosine that has a methyl group attached to it (7-Methyl...
57.7K


