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Updated: May 30, 2026

07:23
Describing a Transcription Factor Dependent Regulation of the MicroRNA Transcriptome
Published on: June 15, 2016
ミオサイト増強因子-2によるトランスクリプションの共抑制体Cabin1のシーケンス固有の徴募
Aidong Han1, Fan Pan, James C Stroud
1Department of Chemistry and Biochemistry, University of Colorado at Boulder, Boulder, Colorado 80309-0215, USA.
Nature
|April 18, 2003
まとめ
ミオサイト増強因子-2 (MEF2) 転写因子は,Cabin1.1のような共抑制剤を勧誘する. この研究は,Cabin1とDNAに結合したMEF2Bの結晶構造を明らかにし,転写抑制の重要なメカニズムを解明しました.
科学分野:
- 分子生物学は分子生物学である.
- 構造生物学 構造生物学とは
- 遺伝学 遺伝学とは
背景:
- ミオサイト増強因子-2 (MEF2) 転写因子はT細胞,ニューロン,筋肉細胞を調節する.
- MEF2は,カルシウム依存の転写抑制と,共活性化剤/共抑制剤による活性化を媒介する.
- MEF2媒介の転写抑制は,心筋細胞高症に関連しています.
研究 の 目的:
- 転写共抑制体のMEF2募集の分子メカニズムを解明する.
- MEF2B,キャビン1,DNAとの相互作用の構造的基礎を決定する.
主な方法:
- Cabin1モチーフとDNAに結合したMEF2B MADS-box/MEF2SドメインのX線結晶学.
- 2.2A解像度での三元複合構造の分析.
主要な成果:
- MEF2BのMADS-box/MEF2Sドメイン,Cabin1モチーフ,DNAの結晶構造が決定されました.
- Cabin1は,MEF2Sドメインに水嫌性の溝を結合するアンフィパティックアルファヘリックスを形成します.
- 三重複合体では三重螺旋の相互作用が観察されました.
結論:
- 結晶構造は,MADSボックスとの安定したMEF2Sドメインの相互作用を示しています.
- MEF2がDNAにコレプレッサーCabin1とクラスIIのHDACを誘導する一般的なメカニズムが実証されています.
- この発見は,MEF2媒介の転写調節に関する洞察を提供します.
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関連する概念動画
Transcription Factors
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...
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...
Master Transcription Regulators
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...
General Transcription Factors
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...
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...
Master Transcription Regulators
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...

