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プレ-mRNAポリアデニレーションに必要なポリアセラゼと割れ方/特異性因子の分離と特徴付け
Y Takagaki1, L C Ryner, J L Manley
1Department of Biological Sciences, Columbia University, New York, New York 10027.
Cell
|March 11, 1988
まとめ
研究者らは,mRNA 3'末端形成を,分裂とポリアデニレーション活動を分離することによって研究した. これらの活動を一緒に復元することで,ポリアデニレーションの特異性と効率が回復しました.
科学分野:
- 分子生物学は分子生物学である.
- バイオケミストリー バイオケミストリー
- RNA 処理 RNA 処理
背景:
- ポリアデニレーションはmRNAの安定性と翻訳に不可欠です.
- ポリアデニル化されたmRNAの3'-端形成には,割れとポリアデニル化が含まれます.
- AAUAAAのような特定の配列が,このプロセスに関与することが知られている.
研究 の 目的:
- mRNA 3'末端形成を制御する明確なメカニズムと要因を調査する.
- 分裂とポリアデニレーションの役割を特定性と効率性において決定する.
- この2つのプロセスがどのように相互作用するかを理解する.
主な方法:
- ヘラ細胞核抽出物の分化により,酵素活性が分離される.
- クリーバージとポリ (A) ポリメラーゼ酵素の浄化.
- 様々な前駆体RNAの分裂とポリアデニレーションの効率と特異性をテストするためのアッセイ.
- 分割された酵素活性を混ぜることで復元実験.
主要な成果:
- 分裂とポリアデニレーションは,区別され,分離可能な酵素活動によって触媒化されます.
- 部分的に浄化された裂解酵素は,AAUAAA信号配列の特異性を保持しました.
- 分割されたポリ (A) ポリメラーゼは特異性を失いました.
- クリーバージとポリ (A) ポリメラーゼ分子を混合することで,効率と特異性の両方が回復しました.
- クリーバージ・アクティビティは,異なる前駆体に対して限られた効率を示したが,ポリアポリメラーゼと併用すると改善された.
結論:
- 分裂とポリアデニレーションの組み合わせは,特定の効率的なmRNA 3'端形成に不可欠です.
- ポリー ((A) ポリメラーゼは,割裂の効率と特異性を回復する役割を果たします.
- 分離可能な要因は,mRNA 3′末端処理の複雑なプロセスに寄与する.
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...
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...
mRNA Stability and Gene Expression
The structure and stability of mRNA molecules regulates gene expression, as mRNAs are a key step in the pathway from gene to protein. In eukaryotes, the half-life of mRNA varies from a few minutes up to several days. mRNA stability is essential in growth and development. The absence of the proteins regulating its stability, such as tristetraprolin in mice, can cause systemic issues, including bone marrow overgrowth, inflammation, and autoimmunity.
Cis-acting Elements involved in mRNA stability
Cis-acting Elements involved in mRNA stability
mRNA Stability and Gene Expression
The structure and stability of mRNA molecules regulates gene expression, as mRNAs are a key step in the pathway from gene to protein. In eukaryotes, the half-life of mRNA varies from a few minutes up to several days. mRNA stability is essential in growth and development. The absence of the proteins regulating its stability, such as tristetraprolin in mice, can cause systemic issues, including bone marrow overgrowth, inflammation, and autoimmunity.
Cis-acting Elements involved in mRNA stability
Cis-acting Elements involved in mRNA stability

