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TATA結合タンパク質は,酵母細胞の3つの核RNAポリメラーゼのトランスクリプションに必要なタンパク質です
1Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Boston, Massachusetts 02115.
Cell
|May 15, 1992
まとめ
イーストのTATA結合タンパク質 (TBP) は,RNAポリメラーゼI,II,IIIを含むすべての核遺伝子転写に不可欠です. TBPを非活性化すると,迅速かつ特異的に転写が停止し,遺伝子発現における直接的な役割が確認される.
科学分野:
- 分子生物学 分子生物学
- イースト遺伝学 イースト遺伝学
- 遺伝子転写 遺伝子転写
背景:
- TATA結合タンパク質 (TBP) は,真核生物における重要な転写因子である.
- 酵母におけるすべての核RNAポリメラーゼにおけるその正確な役割は,完全に解明されていません.
研究 の 目的:
- 酵母TBPがRNAポリメラーゼI,II,IIIによって媒介されるトランスクリプションの必要性を調査する.
- 酵母菌の核にコードされた全ての遺伝子にTBPが不可欠であるかどうかを判断する.
主な方法:
- 温度およびタンパク質分解に敏感なTBP誘導体を in vivo 機能不活性化のために利用した.
- RNAポリメラーゼII,III (U6 snRNA,tRNA),およびI (リボソームRNA) を含む多様な遺伝子の転写にTBP不活性化の影響を評価した.
主要な成果:
- TBPは,TATAボックスの存在に関係なく,RNAポリメラーゼIIの転写に不可欠です.
- TBPはRNAポリメラーゼIIIおよびRNAポリメラーゼI媒介の転写にも必要である.
- TBPの無活性化により,すべてのテストされたプロモーターの転写が迅速かつ特異的に減少しました.
結論:
- 酵母TBPは,核にコードされたすべての遺伝子の転写に必要な基本的な成分です.
- 異なる分子メカニズムは,3つのRNAポリメラーゼの転写機構におけるTBPの役割を支えている可能性が高い.
関連する概念動画
Bacterial RNA Polymerase
Unlike eukaryotes, bacteria use a single RNA Polymerase (RNAP) to transcribe all genes. The different subunits of bacterial RNAPhave distinct functions. The multisubunit structure of the bacterial RNAP helps the enzyme to maintain catalytic function, facilitate assembly, interact with DNA and RNA, and self-regulate its activity.
In most genes, the transcription site is a single base present upstream of the coding sequence. Though RNAP is a catalytically efficient enzyme, it does not recognize...
In most genes, the transcription site is a single base present upstream of the coding sequence. Though RNAP is a catalytically efficient enzyme, it does not recognize...
Eukaryotic RNA Polymerases
RNA Polymerase (RNAP) is conserved in all animals, with bacterial, archaeal, and eukaryotic RNAPs sharing significant sequence, structural, and functional similarities. Among the three eukaryotic RNAPs, RNA Polymerase II is most similar to bacterial RNAP in terms of both structural organization and folding topologies of the enzyme subunits. However, these similarities are not reflected in their mechanism of action.
All three eukaryotic RNAPs require specific transcription factors, of which the...
All three eukaryotic RNAPs require specific transcription factors, of which the...
Bacterial Transcription
RNA polymerase (RNAP) carries out DNA-dependent RNA synthesis in both bacteria and eukaryotes. Bacteria do not have a membrane-bound nucleus. So, transcription and translation occur simultaneously, on the same DNA template.
Transcription can be divided into three main stages, each involving distinct DNA sequences to guide the polymerase. These are:
Transcription can be divided into three main stages, each involving distinct DNA sequences to guide the polymerase. These are:
Bacterial RNA Polymerase
Unlike eukaryotes, bacteria use a single RNA Polymerase (RNAP) to transcribe all genes. The different subunits of bacterial RNAPhave distinct functions. The multisubunit structure of the bacterial RNAP helps the enzyme to maintain catalytic function, facilitate assembly, interact with DNA and RNA, and self-regulate its activity.
In most genes, the transcription site is a single base present upstream of the coding sequence. Though RNAP is a catalytically efficient enzyme, it does not recognize...
In most genes, the transcription site is a single base present upstream of the coding sequence. Though RNAP is a catalytically efficient enzyme, it does not recognize...
Eukaryotic RNA Polymerases
RNA Polymerase (RNAP) is conserved in all animals, with bacterial, archaeal, and eukaryotic RNAPs sharing significant sequence, structural, and functional similarities. Among the three eukaryotic RNAPs, RNA Polymerase II is most similar to bacterial RNAP in terms of both structural organization and folding topologies of the enzyme subunits. However, these similarities are not reflected in their mechanism of action.
All three eukaryotic RNAPs require specific transcription factors, of which the...
All three eukaryotic RNAPs require specific transcription factors, of which the...
Transcription in Prokaryotes
Transcription is a highly regulated process that converts genetic information into RNA molecules. The transcription cycle is divided into three key stages: initiation, elongation, and termination, each driven by specific molecular mechanisms.Initiation of TranscriptionIn bacteria, transcription begins when the RNA polymerase core enzyme associates with a sigma factor to form a holoenzyme. For example, the E. coli sigma factor called σ70 forms a holoenzyme, which recognizes the -10 (Pribnow box)...

