関連する実験動画
Updated: May 7, 2026
10:52
Reconstitution of Basic Mitotic Spindles in Spherical Emulsion Droplets
Published on: August 13, 2016
イースト・スピンドル・ポール・ボディの非対称的なミトーシス分離
E A Vallen1, T Y Scherson, T Roberts
1Department of Molecular Biology, Lewis Thomas Laboratory, Princeton, New Jersey 08544-1014.
Cell
|May 1, 1992
まとめ
KAR1遺伝子は,イースト・スピンドル・ポール・ボディ (SPB) の複製と核融合に不可欠です. KAR1-β-ガラクトシダースのハイブリッドは,SPBに局所化し,SPBと核膜関連性を決定する特定の領域がある.
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:
- イーストのKAR1遺伝子は,スパインドルポールボディ (SPB) の複製と核融合のプロセスに不可欠です.
- KAR1の機能を理解するには,細胞内のその局所と相互作用を調査する必要があります.
- SPB複製は細胞サイクルにおける重要な出来事であり,適切な染色体分離を保証します.
研究 の 目的:
- 酵母細胞内のKAR1タンパク質の局所を決定する.
- KAR1のSPBと核封筒への局所化に責任を負う特定の領域を特定する.
- SPB複製と核融合におけるKAR1の役割を明らかにする.
主な方法:
- KAR1-β-ガラクトシダースハイブリッドタンパク質の構築と分析.
- 野生型および変異酵母菌株 (ndc1) のハイブリッドタンパク質の顕微鏡による局所化研究.
- 局所化とSPB重複に関与するKAR1ドメインの機能分析.
主要な成果:
- KAR1-β-ガラクトシダースのハイブリッドは,SPBの外面に局所する.
- 複製後,ハイブリッドタンパク質は1つのSPBのみと結合し,通常は芽に入ります.
- ndc1変異体では,ハイブリッドは"新しい"SPBに限定的に局所する.
- KAR1の2つの異なる領域が特定されました:一つはSPBの局所化,もう一つは核封筒ターゲティングです.
- これらのローカライゼーションドメインは,SPBの複製に不可欠な機能ドメインと相関しています.
結論:
- KAR1は核包膜に固定されている.
- KAR1は,細胞サイクル中に他のSPB成分と相互作用する可能性が高い.
- 特定された局所化ドメインは,SPBの複製におけるKAR1の役割にとって重要である.
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...
02:19The Spindle Assembly Checkpoint
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...
01:39Anaphase A and B
Microtubules form through the end-to-end polymerization of tubulin heterodimers. Kinetochore microtubules originate from the spindle poles, and their plus-ends connect with the kinetochores on sister-chromatids. Ndc80 protein complexes, present on the kinetochore, form low-affinity links with the plus end of these kinetochore microtubules.
Plus-end depolymerization releases tubulin heterodimers from the terminal region of the microtubule. As tubulin subunits are lost, the Ndc80 complexes detach...
Plus-end depolymerization releases tubulin heterodimers from the terminal region of the microtubule. As tubulin subunits are lost, the Ndc80 complexes detach...
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...
02:19The Spindle Assembly Checkpoint
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...