関連する実験動画
Updated: Jul 13, 2026

04:36
Assay for Adhesion and Agar Invasion in S. cerevisiae
Published on: November 8, 2006
まとめ
イーストのCDC25遺伝子は,循環型AMPとアデニラートサイクラースの活性を制御することによって細胞分裂を調節する. それはおそらくRASタンパク質を調節して機能し,細胞サイクルに影響を与えます.
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
- バイオケミストリー バイオケミストリー
背景:
- CDC25遺伝子は,Saccharomyces cerevisiaeの細胞分裂に不可欠である.
- CDC25の機能を理解することは,細胞周期調節を解読する鍵です.
研究 の 目的:
- S. cerevisiae CDC25遺伝子をクローンし,配列化する.
- 循環型AMPとアデニル酸サイクラースの調節におけるCDC25の役割を調査する.
- 細胞周期制御におけるCDC25とRASタンパク質の関係を決定する.
主な方法:
- 遺伝子クローニングとCDC25の配列決定
- cdc25変異体における周期性AMPレベルとアデニラートサイクラース活性に関する分析.
- 活性化されたRAS2val19およびRAS遺伝子を用いた遺伝抑制分析.
主要な成果:
- CDC25遺伝子は,1589アミノ酸のタンパク質をコードし,既知のタンパク質と有意な同質性はありません.
- cdc25デレーション変異体は,周期性AMP濃度およびアデニラートサイクラース活性が低下しています.
- cdc25障害の致死性は,活性化されたRAS2val19によって抑制され,CDC25機能が正常なRASにとって不可欠であることを示唆しています.
- 活性化されたCDC25アレルは,活性化されたRAS/アデニラートサイクラゼ経路のフェノタイプを模倣する.
結論:
- CDC25は,細胞サイクル進行に関与する調節タンパク質です.
- CDC25は,RASタンパク質へのグアニンヌクレオチド結合を調節することによって,アデニラートサイクラース活性を調節する可能性が高い.
関連する概念動画
Positive Regulator Molecules
To consistently produce healthy cells, the cell cycle—the process that generates daughter cells—must be precisely regulated.
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.
Inhibition of Cdk Activity
The orderly progression of the cell cycle depends on the activation of Cdk protein by binding to its cyclin partner. However, the cell cycle must be restricted when undergoing abnormal changes. Most cancers correlate to the deregulated cell cycle, and since Cdks are a central component of the cell cycle, Cdk inhibitors are extensively studied to develop anticancer agents. For instance, cyclin D associates with several Cdks, such as Cdk 4/6, to form an active complex. The cyclin D-Cdk4/6 complex...
The Ras Gene
The Ras-gene-encoded proteins are regulators of signaling pathways controlling cell proliferation, differentiation, or cell survival. The Ras-gene family in humans constitutes three primary members—the HRas, NRas, and KRas. These genes code for four functionally distinct yet closely related proteins—the HRas, NRas, KRas4A, and KRas4B. The involvement of mutant Ras genes in human cancer was first discovered in 1982 and is among the most common causes of human tumorigenesis.
Ras is a superfamily...
Ras is a superfamily...
Anaphase 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...
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...

