関連する実験動画
Updated: Aug 13, 2026
08:40
Spatial and Temporal Analysis of Active ERK in the C. elegans Germline
Published on: November 29, 2016
周期信号は,タンパク質キナーゼERK2とPKAを含む振動回路によって制御される
Mineko Maeda1, Sijie Lu, Gad Shaulsky
1Department of Biology, Graduate School of Science, Osaka University, Machikaneyama-cho 1-16, Toyonaka, Osaka 560-0043, Japan.
Science (New York, N.Y.)
|May 8, 2004
まとめ
ディクチオステリウム細胞は,振動回路を通じて自己調節を示す. 研究者らは,ミトゲン活性化タンパク質キナーゼ (MAPK) ERK2の振動が周期性アデノシンモノフォスファート (cAMP) パルスと同期し,細胞シグナル伝達を制御することを発見しました.
科学分野:
- 細胞生物学 細胞生物学
- バイオケミストリー バイオケミストリー
- システム生物学 システム生物学
背景:
- 自己調節する生物システムは,強固な制御のために,しばしば振動回路に依存します.
- Dictyostelium discoideumの化学作用シグナル伝達経路は,周期性アデノシンモノフォスファート (cAMP) の振動を7分周期で含む.
研究 の 目的:
- ディクティオステリウムの振動シグナル伝達におけるミトゲン活性化タンパク質 (MAP) キナーゼERK2の役割を調査する.
- ERK2がcAMPレベルに影響を与え,細胞の自己調節に貢献するメカニズムを解明する.
主な方法:
- 自発的なERK2活性化振動の観測.
- フォスフォディエステラーゼRegA.を介して,cAMPレベルに対するERK2の影響の実験的決定.
- 制御回路のコンピュータモデリングとシミュレーション.
主要な成果:
- ERK2の活性化における自発的な振動は,cAMPのピークと相まって観察されました.
- ERK2は,フォスフォディエステラーゼRegA.を調節することによって,cAMPレベルを調節することが示されました.
- コンピュータモデルは,観察された周期的なパルス動作を成功裏に複製しました.
結論:
- ERK2は,Dictyosteliumの自己調節性振動回路における重要な役割を果たしています.
- ERK2とRegAの相互作用は,発達中に周期的なcAMPパルスを生成する鍵です.
- 似たような振動メカニズムは,異なる種にわたって保存されることがあります.
さらに関連する動画
関連する概念動画
01:24Intracellular Signaling Cascades
Once a ligand binds to a receptor, the signal is transmitted through the membrane and into the cytoplasm. The continuation of a signal in this manner is called signal transduction. Signal transduction only occurs with cell-surface receptors, which cannot interact with most components of the cell, such as DNA. Only internal receptors can interact directly with DNA in the nucleus to initiate protein synthesis. When a ligand binds to its receptor, conformational changes occur that affect the...
01:15Amplifying Signals via Second Messengers
Many receptor binding ligands are hydrophilic; they do not cross the cell membrane but bind to cell-surface receptors. Thus, their message must be relayed by second messengers present in the cell cytoplasm. There are several second messenger pathways, each with its own way of relaying information. For example, the G protein-coupled receptors can activate both phosphoinositol and cyclic AMP (cAMP) second messenger pathways. The phosphoinositol pathway is active when the receptor induces...
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...
01:22PI3K/mTOR/AKT Signaling Pathway
The mammalian target of rapamycin (mTOR) is a serine/threonine kinase that regulates growth, proliferation, and cell survival in response to hormones, growth factors, or nutrient availability. This kinase exists in two structurally and functionally distinct forms: mTOR complex 1 (mTORC1) and mTOR complex 2 (mTORC2). The first form (mTORC1) is composed of a rapamycin-sensitive Raptor and proline-rich Akt substrate, PRAS40. In contrast, mTORC2 consists of a rapamycin-insensitive companion...
01:16Calmodulin-dependent Signaling
Calmodulin (CaM) is a calcium-binding protein in eukaryotes that controls various calcium-regulated cellular processes. It has four calcium-binding sites that bind calcium to form the calcium-calmodulin ( Ca2+-CaM) complex. GPCR stimulation increases the calcium levels in the cells that bind to CaM and induces a conformational change.
The Ca2+-CaM complex does not have enzymatic activity by itself. Instead, the complex binds downstream target proteins, including membrane proteins or enzymes,...
The Ca2+-CaM complex does not have enzymatic activity by itself. Instead, the complex binds downstream target proteins, including membrane proteins or enzymes,...