アクティブサイトドメインをグループIIイントロンの5'スプレイスサイトとリンクする三次相互作用
M Boudvillain1, A de Lencastre, A M Pyle
1Department of Biochemistry and Molecular Biophysics and Howard Hughes Medical Institute, Columbia University, New York, New York 10032, USA.
Nature
|August 5, 2000
まとめ
グループIIのイントロンは大きなリボ酵素である. 新しい研究は,ドメイン5とドメイン1を結びつける三次相互作用を明らかにし,自己接合に不可欠なアクティブサイトフレームワークを形成しています.
科学分野:
- 分子生物学は分子生物学である.
- RNA 生物学 RNA 生物学
- バイオケミストリー バイオケミストリー
背景:
- グループIIのイントロンは,自己結合RNA分子が大きく,自己結合RNA分子が大きい.
- その三次構造と活性部位の組織は,未だに十分に理解されていない.
- ドメイン5 (D5) は,イントロン触媒にとって極めて重要な高度に保存された領域です.
研究 の 目的:
- グループIIのイントロンの三次構造を解明する.
- アクティブサイト内のドメイン5 (D5) の空間的関係を決定する.
- D5とドメイン1 (D1) に関する第三者連絡先を特定する.
主な方法:
- グループIIのイントロンの構造分析.
- RNA内の三次相互作用の識別.
- 保存された元素を触媒部位にマッピングする.
主要な成果:
- ラムダ-ラムダと呼ばれる保存された三次相互作用のセットは,D5とD1.1をリンクする.
- これらの相互作用は,アクティブサイトの枠組みを確立します.
- ラムダ-ラムダ相互作用は,5'のスプライス部位にアクティブな部位を固定します.
結論:
- ラムダ-ラムダの相互作用は,グループIIのイントロン触媒に不可欠である.
- この相互作用は,IIグループイントロンの触媒活性のための構造的基礎を提供します.
- 保存された要素は,IIグループ・イントロンと真核分裂体間の機能的リンクを示唆する.
関連する概念動画
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...
pre-mRNA Processing
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 guanosine). This 5’ cap helps the...
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 guanosine). This 5’ cap helps the...
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...
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...


