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Updated: May 28, 2026

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Detection of Alternative Splicing During Epithelial-Mesenchymal Transition
Published on: October 9, 2014
精製された前駆物のインビトロタンパク質スプライシングと,枝分かれした中間物質の識別
M Q Xu1, M W Southworth, F B Mersha
1New England Biolabs, Beverly, Massachusetts 01915.
Cell
|December 31, 1993
まとめ
この研究は,タンパク質のスプライシング,すなわち,タンパク質のセグメントを除去し,残りの部分を結合させるプロセスに関する直接的な証拠を提供します. In vitro実験では,このスプライシングメカニズムが温度とpHに依存していることが示されました.
科学分野:
- バイオケミストリー バイオケミストリー
- 分子生物学は分子生物学である.
- タンパク質化学 タンパク質化学
背景:
- タンパク質のスプライシングは,翻訳後の重要な修正である.
- これは,内部ポリペプチドの切除と側面配列の結合を含む.
- この過程で,単一の前体から2つの異なるタンパク質が形成されます.
研究 の 目的:
- タンパク質のスプライシングの直接的な証拠を提供するために.
- Pyrococcus DNAポリメラーゼススプライシング要素を含むタンパク質前駆体のインビトロスプライシングを調査する.
- タンパク質のスプライシングに影響を与える条件を特徴付けるために.
主な方法:
- Pyrococcus DNAポリメラーゼからのタンパク質スプライシングエレメントを外来遺伝子にクローン化.
- 蓄積した前駆体タンパク質を浄化する.
- in vitroスプライシングアッセイを行う.
- N-端末配列を用いてスプライシング中間物質を分析する.
- 温度とpHがスプライシングに及ぼす影響を調査する.
主要な成果:
- in vitro タンパク質スプライシングの直接的な証拠が示されました.
- スプライシング活動は温度とpHに左右されていることが判明しました.
- ゆっくりと移動する種は,N-端末配列を介して枝分かれした分子として識別され,スプライシングの中間物質の特徴を示した.
- 前駆種と中間種は,pHの変化によって相互に変換可能であった.
結論:
- タンパク質のスプライシングは in vitro で実証および研究することができます.
- 温度とpHは,タンパク質のスプライシング効率を調節する重要な要因です.
- 枝分かれした中間物質は,タンパク質のスプライシングメカニズムに関与しています.
- この発見は,タンパク質加工の分子機構の理解に寄与する.
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...

