関連する実験動画
Updated: Jul 12, 2026
10:52
Reconstitution of Basic Mitotic Spindles in Spherical Emulsion Droplets
Published on: August 13, 2016
Kar9をスパインドルポールとマイクロチューブルに非対称的に負荷すると,適切なスパインドルアライナメントが確保されます
Dimitris Liakopoulos1, Justine Kusch, Sandrine Grava
1Institute of Biochemistry, Swiss Federal Institute of Technology, ETH-Hoenggerberg, HPM, CH-8093 Zürich, Switzerland.
Cell
|February 26, 2003
まとめ
芽生える酵母は,細胞分裂を確実にするため,スピンドルのアラインメントのためにKar9タンパク質を使用します. Clb4/Cdc28キナーゼは,Kar9の分布を制御し,両極を標的にすることを防ぎ,ミトーシス・スピンドルの適切な方向性を確保します.
科学分野:
- 細胞生物学 細胞生物学
- 分子生物学は分子生物学である.
- 遺伝学 遺伝学とは
背景:
- スピンドルの整列は,正確な細胞分裂に不可欠です.
- 芽生える酵母では,Kar9 (APC関連) が母芽軸とのスパインドルの並び方を指示する.
研究 の 目的:
- Kar9の局所化のメカニズムと,スピンドルの調整におけるその役割を解明する.
- カー9分布の調節におけるClb4/Cdc28キナーゼの機能を調査する.
主な方法:
- 発芽酵母におけるKar9の局所化に関する研究.
- Clb4/Cdc28キナーゼによるKar9のリン酸化の分析.
- Cdc28コンセンサスサイトの変異分析.
主要な成果:
- Kar9は,子細胞のスパインドルポールに局所化し,細胞プラズマのマイクロチューブルに転送されます.
- Clb4/Cdc28はKar9をリン酸化し,その負荷を母細胞柱に負わせない.
- リン酸化を阻害する突然変異は,Kar9を両極に誤局化し,異常な標的化につながります.
結論:
- Cdk1依存のリン酸化によって調節される非対称なKar9分布は,正しいスパインドルの方向性を保証します.
- このメカニズムは,芽生えた酵母菌の細胞分裂軸とミトーシス・スパインドルの適切な配列を保証する.
関連する概念動画
02:27The Mitotic Spindle
The mitotic spindle—or spindle apparatus—is a eukaryotic, cytoskeletal structure made up of long protein fibers called microtubules. Formed during cell division, the spindle separates sister chromatids and moves them to opposite ends of a parental cell, where the now individual chromosomes are distributed to two daughter cell nuclei.
The bipolar configuration of the mitotic spindle facilitates chromosomal segregation, preparing the cell for division. One mechanism that ensures bipolar mitotic...
The bipolar configuration of the mitotic spindle facilitates chromosomal segregation, preparing the cell for division. One mechanism that ensures bipolar mitotic...
02:50Spindle Assembly
Spindle assembly occurs through three, often coexisting, pathways – the centrosome-mediated pathway, the chromatin-mediated pathway, and the microtubule-mediated pathway – collectively contributing to form a robust spindle apparatus.
In most cells, centrosomes are the primary microtubule nucleation centers. In the centrosome-mediated pathway, the G2-prophase transition triggers centrosome maturation and increased microtubule nucleation. Progressive nucleation results in a microtubule array...
In most cells, centrosomes are the primary microtubule nucleation centers. In the centrosome-mediated pathway, the G2-prophase transition triggers centrosome maturation and increased microtubule nucleation. Progressive nucleation results in a microtubule array...
02:57Attachment of Sister Chromatids
As cells progress into mitosis, the nuclear envelope breaks down, and the condensed chromosomes are exposed to the array of bipolar microtubules of the mitotic spindle. The kinetochore, a large, disc-shaped protein complex, is present at the centromere region of the sister chromatids and acts as a binding site for the microtubules. Usually, the plus-end of a single microtubule is embedded within the kinetochore. However, some kinetochores first establish lateral contact with the side-wall of a...
02:11Forces Acting on Chromosomes
During mitosis, chromosome movements occur through the interplay of multiple piconewton level forces. In prometaphase, these forces help in chromosome assembly or congression at the equatorial plane, eventually leading to their alignment at the metaphase plate. The forces acting on the chromosomes are space and time-dependent; therefore, they vary with the position of the chromosomes as the cell progresses through mitosis.
Microtubules and motor proteins exert two types of forces on...
Microtubules and motor proteins exert two types of forces on...
02:27The Mitotic Spindle
The mitotic spindle—or spindle apparatus—is a eukaryotic, cytoskeletal structure made up of long protein fibers called microtubules. Formed during cell division, the spindle separates sister chromatids and moves them to opposite ends of a parental cell, where the now individual chromosomes are distributed to two daughter cell nuclei.
The bipolar configuration of the mitotic spindle facilitates chromosomal segregation, preparing the cell for division. One mechanism that ensures bipolar mitotic...
The bipolar configuration of the mitotic spindle facilitates chromosomal segregation, preparing the cell for division. One mechanism that ensures bipolar mitotic...
02:50Spindle Assembly
Spindle assembly occurs through three, often coexisting, pathways – the centrosome-mediated pathway, the chromatin-mediated pathway, and the microtubule-mediated pathway – collectively contributing to form a robust spindle apparatus.
In most cells, centrosomes are the primary microtubule nucleation centers. In the centrosome-mediated pathway, the G2-prophase transition triggers centrosome maturation and increased microtubule nucleation. Progressive nucleation results in a microtubule array...
In most cells, centrosomes are the primary microtubule nucleation centers. In the centrosome-mediated pathway, the G2-prophase transition triggers centrosome maturation and increased microtubule nucleation. Progressive nucleation results in a microtubule array...