DBIRD複合体は,RNAポリメラーゼIIのトランスクリプト延長と代替mRNAスプライシングを統合しています
Pierre Close1, Philip East, A Barbara Dirac-Svejstrup
1Mechanisms of Transcription Laboratory, Cancer Research UK London Research Institute, Clare Hall Laboratories, South Mimms EN6 3LD, UK.
Nature
|March 27, 2012
まとめ
新しいDBIRD複合体は,RNAポリメラーゼII (RNAPII) をメッセンジャーリボヌクレオプロテイン (mRNP) 粒子と結びつける. この複合体は,トランスクリプトの延長と代替スプライシングを統合し,特に (A+T) 豊富なDNAのエクソンを統合します.
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:
- 代替メッセンジャーRNA (mRNA) スプライシングは,限られた遺伝子セットからタンパク質の複雑性を生み出します.
- スプライシングはトランスクリプションと結合し,トランスクリプトの延長率に影響されます.
- 転写RNAポリメラーゼII (RNAPII) とメッセンジャーリボヌクレオプロテイン (mRNP) 粒子の関連性は不明である.
研究 の 目的:
- クロマチン関連 mRNP 粒子のヒトのインタラクトームを特徴づけるために.
- RNAPII,mRNP粒子,およびスプライシング規制を結びつける要因を特定する.
- 転写とスプライシングの統合におけるこれらの要因の役割を明らかにする.
主な方法:
- クロマチン関連 mRNP 粒子のヒトインタラクトーム解析.
- RNAPIIと相互作用するタンパク質複合体の識別と特徴付け.
- 機能的影響を評価するために,RNA-干渉 (RNAi) 媒介の枯渇.
- トランスクリプトの伸び率と代替スプライシングパターンの分析.
主要な成果:
- DBC1とZNF326 (ZIRD) を含むDBIRD複合体を,新しいRNAPIIインタラクターとして特定しました.
- DBIRDはRNAPIIに直接結合し,影響を受けたエクソンに局在しています.
- DBIRDは, (A+T) 豊富なDNAにおけるエクソンの代替スプライシングを調節する.
- DBIRDの枯渇は,トランスクリプトの伸びの地域特有の減少を引き起こします.
結論:
- DBIRD複合体は,mRNP粒子とRNAPIIのインターフェースで作用する.
- DBIRDは,トランスクリプトの延長と代替スプライシングの規制を統合しています.
- このメカニズムは,哺乳類のプロテオミクスの複雑さに寄与する.
関連する概念動画
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...
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...
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...
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...


