関連する実験動画
Updated: Jul 15, 2026
10:37
Induction and Analysis of Epithelial to Mesenchymal Transition
Published on: August 27, 2013
パキテンの脱出は,Mek1依存のリン酸化を逆転させることで制御されます
1Department of Molecular, Cellular, and Developmental Biology, Yale University, New Haven, Connecticut 06520, USA.
Cell
|April 29, 2000
まとめ
酵母ミオシスのチェックポイントは,再結合が欠陥のあるとき,細胞サイクル進行を停止するために,Red1とMek1タンパク質を使用します. タンパク質フォスファタゼ1型 (Glc7) は,Red1.1.をデフォスフォリル化することによって,このチェックポイントを無効化する.
科学分野:
- 細胞生物学 細胞生物学
- 遺伝学 遺伝学とは
- 分子生物学は分子生物学である.
背景:
- メイオシスは複雑な染色体ペアリングと再結合を伴う.
- パキテンのチェックポイントは,適切なメオティック進行を保証し,再結合またはシナプスが欠陥がある場合,脱出を防止します.
- 主要なタンパク質であるRed1とMek1は,酵母におけるこのチェックポイントに不可欠です.
研究 の 目的:
- イーストミオシス中のパキテンチェックポイントの規制メカニズムを調査する.
- 媒質の進行を制御するRed1,Mek1,Glc7の役割を解明する.
主な方法:
- 酵母遺伝子を活用して,中性再結合とシナプスの欠陥を持つ変異体を研究した.
- コイムノプレシピテーションとインビトロ脱酸化アッセイを用いた.
- タンパク質の局所化とリン酸化状態を調査した.
主要な成果:
- チェックポイント誘発パキテン停止では,Mek1キナーゼ活性とRed1リン酸化が維持されます.
- Mek1の活性化は,中性再結合の開始とDNA損傷のチェックポイントタンパク質に依存しています.
- タンパク質フォスファタゼ1型 (Glc7) は,Mek1の活性とパキテンの停止を逆行する.
- Glc7はRed1と相互作用し,それをin vitroで除し,染色体上で同位体化する.
結論:
- 酸化Red1はパキテンの停止を維持している可能性が高い.
- ミエオティック再結合の完了は,Red1のGlc7媒介の脱リン酸化を誘発し,チェックポイントの解放を可能にします.
- この研究は,中性チェックポイントの制御において,リン酸化および脱リン酸化を含む規制経路を明らかにしています.
関連する概念動画
02:15M-Cdk Drives Transition Into Mitosis
Checkpoints throughout the cell cycle serve as safeguards and gatekeepers, allowing the cell cycle to progress in favorable conditions and slow or halt it in problematic ones. This regulation is known as the cell cycle control system.
Cyclin-dependent kinases, or Cdks, work in concert with cyclins to control cell cycle transitions. M-Cdk, a complex of Cdk1 bound to M cyclin, is a well-known example of this coordinated control that drives the transition from the G2 to the M phase.
M cyclin...
Cyclin-dependent kinases, or Cdks, work in concert with cyclins to control cell cycle transitions. M-Cdk, a complex of Cdk1 bound to M cyclin, is a well-known example of this coordinated control that drives the transition from the G2 to the M phase.
M cyclin...
02:17Separation of Sister Chromatids
At the transition from prophase to metaphase, there is a reduction in cohesion along the chromosomal arms, resulting in the resolution of sister chromatids. However, residual cohesin connections remain to hold the sister chromatids together until the transition from metaphase to anaphase. The residual connection prevents any premature separation of sister chromatids, blocking the risks of aneuploidy within the daughter cells.
At the onset of anaphase, separase, a proteolytic enzyme, is...
At the onset of anaphase, separase, a proteolytic enzyme, is...
00:50Anaphase Promoting Complex
The stepwise destruction of specific proteins is necessary for the progression and completion of the cell cycle. Such proteins are ubiquitinated by ubiquitin ligases and then subsequently destroyed by the proteasome. The SCF (Skp1/Cullin/F-box) and the anaphase-promoting complex (APC) are two important ubiquitin ligases involved in cell cycle progression. While SCF is active throughout the cell cycle, APC gets activated during metaphase to anaphase transition. Cdc20 or Cdh1 binds to APC and...
01:19Interactions 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...
01:22Amplifying Signals via Enzymatic Cascade
When a ligand binds to a cell-surface receptor, the receptor's intracellular domain changes shape, which may either activate its enzyme function or allow its binding to other molecules. The initial signal is amplified by most signal transduction pathways. This means that a single ligand molecule can activate multiple molecules of a downstream target. Proteins that relay a signal are most commonly phosphorylated at one or more sites, activating or inactivating the protein. Kinases catalyze the...
01:07MAPK 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...