関連する実験動画
Updated: Aug 3, 2026

04:36
Assay for Adhesion and Agar Invasion in S. cerevisiae
Published on: November 8, 2006
イーストのMAPKシグナリングの特異性のために必要な組み合わせ制御
1Whitehead Institute for Biomedical Research, 9 Cambridge Center, Cambridge, MA 02142, USA.
まとめ
酵母では,転写因子Ste12とTec1が協力して,異なる発達プログラムを制御します. 線維と侵入反応要素 (FREs) との相互作用により,ミトゲン活性化タンパク質キナーゼ (MAPK) 信号伝達に対する特定の反応が保証されます.
科学分野:
- 分子生物学は分子生物学である.
- イースト遺伝学 イースト遺伝学
- セルラー・シグナリング
背景:
- ミトゲン活性化タンパク質キナーゼ (MAPK) 信号伝達経路は,ペアリング,侵入,シドホイファルの発達を含む酵母における多様な細胞過程を調節する.
- 転写因子Ste12は,これらの独特な発達プログラムに不可欠な重要な下流成分です.
- これらのプログラムにおける開発特異性を確保する正確なメカニズムは,まだ完全に理解されていません.
研究 の 目的:
- イーストのMAPKシグナル伝達における発達特異性の基礎にある分子メカニズムを解明する.
- 転写因子Tec1がSte12.と協力する役割を調査する.
- 遺伝子発現の調節におけるフィラメントと侵入反応要素 (FREs) の機能を特徴づける.
主な方法:
- 精製されたSte12およびTec1誘導体を用いた転写因子結合の生化学分析.
- 標的遺伝子のプロモーターにおける強化元 (FREs) の識別と特徴付け.
- MAPKシグナル伝達成分に対する反応における遺伝子発現パターンの分析.
主要な成果:
- TEA/ATTSファミリーの転写因子であるTec1は,Ste12と連携して,発達特異性を付与する.
- Ste12とTec1は,FREsとして知られる特定のDNA配列に協力的に結合する.
- FREsは,糸状の成長を制御するMAPK信号経路への応答として,トランスクリプションのプログラミングに不可欠です.
- TEC1プロモーター内のFREは,シドホイファルの発達に不可欠なポジティブなフィードバックループを形成します.
結論:
- Ste12とTec1をFREsに協力的に結合することは,酵母MAPKシグナル伝達における発達特異性を達成するための重要なメカニズムです.
- TEC1プロモーターのFREは,シドホイファルの発達を強化するポジティブなフィードバックループを確立します.
- この研究は,複合的な細胞行動の制御において,転写因子とシス調節要素を含む洗練された調節ネットワークを明らかにしています.
関連する概念動画
Yeast Signaling
Yeasts are single-celled organisms, but unlike bacteria, they are eukaryotes (cells with a nucleus). Cell signaling in yeast is similar to signaling in other eukaryotic cells. A ligand, such as a protein or a small molecule released from a yeast cell, attaches to a receptor on the cell surface. The binding stimulates second-messenger kinases to activate or inactivate transcription factors that further regulate gene expression. Many of the yeast intracellular signaling cascades have similar...
Combinatorial Gene Control
Combinatorial gene control is the synergistic action of several transcriptional factors to regulate the expression of a single gene. The absence of one or more of these factors may lead to a significant difference in the level of gene expression or repression.
The expression of more than 30,000 genes is controlled by approximately 2000-3000 transcription factors. This is possible because a single transcription factor can recognize more than one regulatory sequence. The specificity in gene...
The expression of more than 30,000 genes is controlled by approximately 2000-3000 transcription factors. This is possible because a single transcription factor can recognize more than one regulatory sequence. The specificity in gene...
Positive Regulator Molecules
Mitotic cell division results in daughter cells that exactly resemble the parent cell. However, errors in the DNA replication or distribution of genetic material may lead to genetic mutations that may be passed down to every new cell formed from the resulting abnormal cell. Propagation of such mutant cells is restricted through checkpoint mechanisms present at different stages of the cell cycle. These checkpoints involve regulator molecules that either promote or demote cell cycle events.
Interactions Between Signaling Pathways
Signaling cascades usually lack linearity. Multiple pathways interact and regulate one another, allowing cells to integrate and respond to diverse environmental stimuli.
Convergence and divergence, and cross-talk between signaling pathways
Two distinct signaling pathways can converge on a single functional unit, which may either be a single protein or a complex of proteins. The response is either functionally distinct or synergistic between the two pathways but different from the response...
Convergence and divergence, and cross-talk between signaling pathways
Two distinct signaling pathways can converge on a single functional unit, which may either be a single protein or a complex of proteins. The response is either functionally distinct or synergistic between the two pathways but different from the response...
MAPK Signaling Cascades
Mitogen-activated protein kinase, or MAPK pathway, activates three sequential kinases to regulate cellular responses such as proliferation, differentiation, survival, and apoptosis. The canonical MAPK pathway starts with a mitogen or growth factor binding to an RTK. The activated RTKs stimulate Ras, which recruits Raf or MAP3 Kinase (MAPKKK), the first kinase of the MAPK signaling cascade. Raf further phosphorylates and activates MEK or MAP2 Kinases (MAPKK), which in turn phosphorylates MAP...
cAMP-dependent Protein Kinase Pathways
Cyclic Adenosine Monophosphate (cAMP) is an essential second messenger that activates protein kinase A (PKA) and regulates various biological processes. A single epinephrine molecule binds to GPCR and activates several heterotrimeric G proteins, each stimulating multiple adenylyl cyclase, amplifying the signal, and synthesizing large numbers of cAMP molecules. Small changes in cAMP concentration affect PKA activity. The binding of four cAMP molecules induces a conformational change in PKA,...

