まとめ
マウスのリボソーム遺伝子は,RNAポリメラーゼIの転写を制御する上流ターミネーター配列を有しています. この部位はタンパク質因子と相互作用し,効率的な遺伝子発現のための終結と開始の両方に影響を与える.
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:
- リボソーム遺伝子はタンパク質合成に不可欠であり,正確な調節が必要です.
- トランスクリプション終末部位は,遺伝子の3'末端で通常見られます.
- リボソーム遺伝子の転写終了における上流配列の役割は完全に理解されていません.
研究 の 目的:
- ネズミのリボソーム遺伝子における新たに特定された上流配列の機能を調査する.
- この上流配列が転写端末として作用するかどうかを判断する.
- 転写終了とリボソーム遺伝子調節の開始との関係を調査する.
主な方法:
- RNAポリメラーゼIを用いたインビトロ転写アッセイ.
- RNAトランスクリプトを検出するためのS1マッピング.
- 核の実験を継続する.
- アップストリームプロモーター要素の識別と特徴付け.
主要な成果:
- マウスのリボソーム遺伝子で,機能的なアップストリームターミネーター配列が特定されました.
- この部位はRNAポリメラーゼIの転写を終了させ,特定のタンパク質因子と相互作用します.
- この上流部位で終了した5'-末端のスペーサートランスクリプトの証拠が見つかりました.
- プレ-rRNA開始部位から約2kb上流で,スペーサープロモーターが特定されました.
- アップストリームターミネーターの核因子との相互作用により,開始効率が向上した.
結論:
- マウスのリボソーム遺伝子は,機能的な上流転写ターミネーターを持っています.
- この上流端末と隣接するプロモーターは,機能的に相互に関連しています.
- アップストリームターミネーターは,リボソーム遺伝子転写の開始と終了を調節する役割を果たします.
関連する概念動画
Eukaryotic RNA Polymerases
17.3K
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...
17.3K
Chromatin Structure Regulates pre-mRNA Processing
6.6K
In eukaryotic cells, nascent mRNA transcripts need to undergo many post-transcriptional modifications to reach the cell cytoplasm and translate into functional proteins. For a long time, transcription and pre-mRNA processing were considered two independent events that occur sequentially in the cell. However, it has now been well established that transcription and pre-mRNA processing are two simultaneous processes that are precisely regulated inside the cell.
The chromatin structure, especially...
The chromatin structure, especially...
6.6K
Transcription Attenuation in Prokaryotes
14.6K
Transcriptional attenuation occurs when RNA transcription is prematurely terminated due to the formation of a terminator mRNA hairpin structure. Bacteria use these hairpins to regulate the transcription process and control the synthesis of several amino acids including histidine, lysine, threonine, and phenylalanine. Transcription attenuation takes place in the non-coding regions of mRNA.
There are several different mechanisms used to attenuate transcription. In ribosome mediated...
There are several different mechanisms used to attenuate transcription. In ribosome mediated...
14.6K
Bacterial Transcription
25.6K
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:
25.6K
Transcription Initiation
17.0K
Initiation is the first step of transcription in eukaryotes. Prokaryotic RNA Polymerase (RNAP) can bind to the template DNA and start transcribing. On the other hand, transcription in eukaryotes requires additional proteins, called transcription factors, to first bind to the promoter region in the DNA template. This binding helps recruit the specific RNAP that can assemble on the DNA and start transcription.
The promoters and enhancers and their accessory proteins allow tight regulation of...
The promoters and enhancers and their accessory proteins allow tight regulation of...
17.0K
Transcriptional Regulation: Riboswitches
1.2K
Riboswitches are RNA elements that regulate gene expression by altering their secondary structures in response to specific effector molecules. These elements, located in the leader regions of certain mRNAs, act as transcriptional regulators by toggling between alternative conformations to control downstream gene expression. Riboswitch-mediated regulation is a precise mechanism for modulating biosynthetic pathways, as exemplified by the riboflavin biosynthesis pathway in Bacillus...
1.2K


