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Analysis of Cell Cycle Position in Mammalian Cells
Published on: January 21, 2012
転写因子E2Fの性質を持つpRB結合タンパク質をコードするcDNA
Cell
|July 24, 1992
まとめ
研究者らは,網膜芽細胞腫タンパク質 (pRB) と相互作用するタンパク質であるRBP3を特定した. RBP3は,E2F転写因子と類似して機能し,特定のDNA配列に結合することによって細胞増殖を調節する.
科学分野:
- 分子生物学は分子生物学である.
- 細胞生物学 細胞生物学
- ウイルス学 ウイルス学 ウイルス学
背景:
- 網膜芽細胞腫タンパク質 (pRB) は,細胞サイクル進行の重要な調節体である.
- pRBは,転写因子,特にE2Fと相互作用することによって細胞増殖を制御します.
研究 の 目的:
- E2Fのような性質を持つタンパク質をコードするcDNAクローンを特徴付ける.
- 特定されたタンパク質 (RBP3) とpRB.との相互作用を調査する.
主な方法:
- cDNAクローニングとタンパク質の特徴化.
- インビトロおよびインビボ結合測定法.
- トランジエント発現とプロモータートランザクティベーションアッセイ.
主要な成果:
- cDNAクローンであるRBP3は,pRBとの相互作用に基づいて分離されました.
- RBP3は,E2F認識サイトへのシーケンス固有の結合を示した.
- RBP3は,E2Fサイトに依存するアデノウイルスE2プロモーターの10倍トランザクティベーションを媒介した.
結論:
- RBP3は,E2F転写因子と一致する性質を示しています.
- RBP3は,pRBの相互作用とE2Fのような活動を通して,遺伝子発現を調節する役割を果たします.
関連する概念動画
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Tissue-specific transcription factors contribute to diverse cellular functions in mammals. For example, the gene for beta globin, a major component of hemoglobin, is present in all cells of the body. However, it is only expressed in red blood cells because the transcription factors that can bind to the promoter sequences of the beta globin gene are only expressed in these cells. Tissue-specific transcription factors also ensure that mutations in these factors may impair only the function of...
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RNA Polymerase II Accessory Proteins
Proteins that regulate transcription can do so either via direct contact with RNA Polymerase or through indirect interactions facilitated by adaptors, mediators, histone-modifying proteins, and nucleosome remodelers. Direct interactions to activate transcription is seen in bacteria as well as in some eukaryotic genes. In these cases, upstream activation sequences are adjacent to the promoters, and the activator proteins interact directly with the transcriptional machinery. For example, in...
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Master transcription regulators are regulatory proteins that are predominantly responsible for regulating the expression of multiple genes. Often these genes work in concert to drive a complex process. Activation of a master transcription regulator can lead to a cascade of transcriptional activation necessary for that outcome. These regulators can directly bind to the regulatory sequences of the various genes involved, or they can indirectly regulate transcription by binding to regulatory...

