CDC28とサイクリンが芽生えた酵母菌S. cerevisiaeのミトーシス過程で果たす役割
U Surana1, H Robitsch, C Price
1Research Institute of Molecular Pathology, Vienna, Austria.
Cell
|April 5, 1991
まとめ
研究者らは,cdc28-1N細胞のミトーシス欠陥を抑制する遺伝子を特定しました. これらの遺伝子はG2固有のサイクリンをコードし,CDC28が適切な細胞分裂のためにサイクリンと相互作用することを示唆しています.
科学分野:
- 細胞生物学 細胞生物学
- 分子遺伝学 分子遺伝学
背景:
- CDC28遺伝子製品は,酵母細胞の細胞サイクル進行に不可欠です.
- 特定のアレルであるcdc28-1Nは,正常なG1 (スタート) 機能を示しているが,ミトーシスの欠陥を示している.
研究 の 目的:
- cdc28-1N細胞のミトーシス成長欠陥を抑制する遺伝子を特定する.
- 遺伝抑制分析を通じて,ミトーシスにおけるCDC28の役割を明らかにする.
主な方法:
- cdc28-1N成長欠陥の高用量抑制剤の分離.
- PCR増幅を含む抑制遺伝子のクローニングと特徴付け.
- 二重変異株 (例えば,cdc28-1N clb2::LEU2) の構築と分析.
主要な成果:
- 7つの遺伝子が抑制剤として特定され,3つの遺伝子は,G2固有のB型サイクリン (CLB1,CLB2,CLB4) に同質なタンパク質をコードする.
- CLB3はまた,G2固有のサイクリンをコードしています.
- CLB1とCLB2の両方の障害は致命的で,ミトーシス欠陥を引き起こし,それらの重要な役割を示します.
- ダブルミュータントのcdc28-1N clb2::LEU2は,cdc28-4 clb2::LEU2とは異なり,生存不能であり,特定の相互作用の欠陥を示唆しています.
結論:
- CDC28の機能は,G1とミトーシスの両方で必要です.
- CDC28のミト性役割は,CLB1,CLB2,CLB3,CLB4を含むG2固有のサイクリンの一族との相互作用を含む可能性が高い.
関連する概念動画
02:17Separation of Sister Chromatids
3.6K
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...
3.6K
02:19The Spindle Assembly Checkpoint
2.9K
The spindle assembly checkpoint is a molecular surveillance mechanism ensuring the fidelity of chromosome segregation during anaphase. The checkpoint monitors the completion of all the prerequisite steps before chromosome segregation to determine whether the segregation process should proceed or be delayed.
Many proteins function together to control the spindle assembly checkpoint. Mutations affecting these proteins may allow cells to proceed into anaphase prematurely, resulting in the...
Many proteins function together to control the spindle assembly checkpoint. Mutations affecting these proteins may allow cells to proceed into anaphase prematurely, resulting in the...
2.9K
01:02Role of Microtubules in Cell Wall Deposition
2.5K
Microtubules are small hollow tubes in eukaryotic cells. The cell wall microtubules are polymerized dimers of two globular proteins, α-tubulin and β-tubulin, two globular proteins. With a diameter of about 25 nm, microtubules are the widest components of the cytoskeleton. They help the cell resist compression and provide a track along which vesicles move through the cell or pull replicated chromosomes to opposite ends of a dividing cell. Microtubules go through quick cycles of...
2.5K
01:17Gene Regulation During Sporulation
713
Sporulation is a complex developmental process that allows certain Gram-positive bacteria, such as Bacillus subtilis and Clostridium species, to survive extreme environmental conditions. This process is tightly regulated by a series of signaling cascades and transcriptional controls, ensuring the formation of a highly resistant endospore.Sporulation is triggered by unfavorable conditions, such as nutrient depletion, and is governed by a phosphorelay system. One of the sensor kinases, such as...
713
01:25Microbes in Beverage Production
298
Alcoholic beverages such as wine, beer, and spirits are the products of microbial fermentation processes that transform simple sugars into ethanol and a wide array of complex flavor compounds. These transformations rely on the metabolic activities of specific yeasts and bacteria, which are selected and controlled to yield the desired beverage characteristics.Wine Fermentation and MaturationWine production begins with the crushing of grapes to release juice and pulp, forming a must that is...
298
01:22Bioreactor Controls-III
67
Strain improvement is a foundational strategy in industrial microbiology aimed at maximizing microbial productivity, particularly because natural isolates typically yield commercially valuable products in very low concentrations. Although optimizing the culture medium and environmental conditions can improve yields, these adjustments are inherently limited by the organism’s genetic potential. As a result, the focus shifts toward genetic modifications to enhance biosynthetic capacity. The...
67