トランススプライシングは,小さな核リボ核タンパク質粒子の新しい形態を伴う
J P Bruzik1, K Van Doren, D Hirsh
1Howard Hughes Medical Institute, Department of Molecular Biophysics and Biochemistry, Yale University, New Haven, Connecticut 06510.
Nature
|October 6, 1988
まとめ
トリパノソームとネマトードにおけるトランススプライシングは,Sm小核リボ核タンパク質粒子 (SL snRNP) を形成するスライスされたリーダー (SL) RNAを使用します. これらのSL snRNPは,自身の5'スプライスサイトを活性化させ,トランススプライシングでU1 snRNPの必要性を排除する可能性がある.
科学分野:
- 分子生物学は分子生物学である.
- 遺伝学 遺伝学とは
- バイオケミストリー バイオケミストリー
背景:
- トランススプライシング (trans-splicing) は,スライスされたリーダーRNA (SLRNA) から前身mRNAへのエクソンの移転を含むプロセスで,トライパノソームやCaenorhabditis elegansのような生物で発生します.
- このプロセスは,cis-splicingと類似性を共有し,細胞機械の潜在的重複を示唆しています.
研究 の 目的:
- トランススプライシングにおけるSLRNAの構造的および機能的特性を調査する.
- SLRNAの役割と,細胞の構成要素,特に小核リボ核タンパク質粒子 (snRNP) との相互作用を決定する.
主な方法:
- 様々な種におけるSLRNAの二次構造予測.
- HeLa細胞核抽出物でSLRNAをインキュベーションする.
- 哺乳類のsnRNPタンパク質に対するアンチ-Sm抗体および他の自己抗体を用いた免疫プレシピテーションアッセイ.
主要な成果:
- 異なる種のSLRNAは,配列と長さの変動にもかかわらず,3つの幹のループを持つ保存された二次構造を示しています.
- SLRNAにはコンセンサスのSm結合配列が存在する.
- SL RNAsは,Sm抗体と免疫受容性の複合体を形成し,Sm snRNP (SL snRNP) と関連していることを示している.
結論:
- SL RNAsは,トランススプライシングにおいてSL snRNPとして機能する可能性が高い.
- SL snRNPは,自律的に独自の5'スプライスサイトを活性化し,潜在的にcis-splicingで見られるU1 snRNPの機能を置き換える可能性があります.
関連する概念動画
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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...
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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...


