まとめ
研究者らは,プリ-mRNAの3'スプライス部位に結合する70 kdのタンパク質を特定した. このタンパク質は,小さな核リボ核タンパク質粒子と結合し,mRNAスプライシングに不可欠です.
科学分野:
- 分子生物学は分子生物学である.
- RNA スプライシング
- タンパク質生化学 タンパク質生化学
背景:
- プレ-mRNAスプライシングは,遺伝子発現における基本的なプロセスです.
- 特定のタンパク質因子は,プレ-mRNAのスプライスサイトを認識するために不可欠です.
- 3'スプライス部位は,スプライソーム組立のための重要な認識要素です.
研究 の 目的:
- HeLa細胞核抽出物における3'スプライス部位認識を担うタンパク質成分を特定し,特徴づけること.
- この3'スプライス部位結合因子の結合特性と相互作用を調査する.
主な方法:
- ヘラ細胞核抽出物の分化.
- RNA-結合活性を検出するためのRNAase T1保護アッセイ.
- 特定の抗体 (アンチ-スム,アンチ-2,2,7-トリメチルグアノシン) を用いたタンパク質ブラッティングとウエスタン・ブラット分析.
- タンパク質-RNA相互作用とMg++濃度依存度を評価するための生化学的測定法.
主要な成果:
- Anti-Sm抗体によって認識される70 kdのタンパク質は,3'スプライス部位結合活性と共浄化することが判明しました.
- 70kdのポリペプチドはプレ-mRNAに結合し,3'スプライス結節近くの配列を好みます.
- この結合成分は,低Mg++条件下で小核リボ核タンパク質粒子 (snRNP) と結合する.
結論:
- 70kdのSmを含むタンパク質は,pre-mRNAスプライシング中に3'スプライスサイトを認識する重要な要素である.
- このタンパク質のsnRNPとの結合は,Mg++濃度によって調節され,スプライソーム組立に影響を与えます.
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...
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...
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...
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...
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...
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...


