キネトコア微小管のダイナミクスと結合の安定性は,Hec1によって調節される
Jennifer G DeLuca1, Walter E Gall, Claudio Ciferri
1Department of Biology, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA. jgdeluca@email.unc.edu
Cell
|November 30, 2006
まとめ
Ndc80/Hec1のタンパク質は
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:
- 細胞分裂中の正確な染色体分離は,キネトコア-マイクロチューブル結合の正確な調節に依存しています.
- Ndc80/Hec1複合体は,キネトコアと微小管の相互作用において極めて重要です.
- キネトコアにおけるマイクロチューブルプラスエンドのダイナミックな調節は,フィデリティに不可欠である.
研究 の 目的:
- Ndc80/Hec1のN端が,キネトコア微小管のダイナミクスと結合の安定性を調節する役割を調査する.
- 染色体分離におけるNdc80/Hec1のN端フォスフォリレーションの変化の機能的影響を明らかにする.
主な方法:
- PtK1細胞にHec1N端末を標的とした抗体のマイクロインジェクション.
- キネトコアとマイクロチューブルの動態と結合の信頼性の分析.
- オーロラBキナーゼを用いたインビトロリン酸化アッセイ.
- 非酸化可能なHec1変異体を発現する細胞の特徴.
主要な成果:
- 抗体注入は微小管のダイナミクスと結合の安定性を破壊し,超ストレッチされたセントロメアと染色体分離の誤差を引き起こした.
- オーロラBキナーゼは,Hec1N末端をin vitroでリン酸化する.
- 非酸化性Hec1変異体は,メロテルの結合と分離の誤差を増加させた.
- Hec1N末端は,キネトコア微小管のプラスエンドダイナミクスの制御に不可欠である.
結論:
- Ndc80/Hec1のN端は,キネトコア微小管のダイナミクスと結合の安定性を調節する上で重要な役割を果たします.
- オーロラBキナーゼによるHec1N端末のリン酸化は,正確な染色体分離に重要である.
- Hec1 N-端末機能の調節不良は,染色体分離における重大なエラーにつながります.
さらに関連する動画
08:33Combining Mitotic Cell Synchronization and High Resolution Confocal Microscopy to Study the Role of Multifunctional Cell Cycle Proteins During Mitosis
Published on: December 5, 2017
15.1K
05:35Immunofluorescence Analysis of Endogenous and Exogenous Centromere-kinetochore Proteins
Published on: March 3, 2016
15.8K
関連する概念動画
Attachment of Sister Chromatids
4.2K
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...
4.2K
Microtubule Instability
6.4K
Microtubules are hollow cylindrical filaments having a diameter of approximately 25 nm and a length that varies from 200 nm to 25 μm. GTP-bound tubulin subunits form αβ-heterodimers for microtubule assembly. These core building blocks interact longitudinally, polymerizing into protofilaments. The protofilaments then interact with one another through lateral bonding forces to form stable cylindrical microtubules. These cylindrical filaments are dynamic as they undergo repeated...
6.4K
Microtubule Instability
6.2K
No description available
6.2K
The Spindle Assembly Checkpoint
4.0K
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...
4.0K
Cohesins
5.9K
Cohesin protein complexes are a molecular glue that holds two sister chromatids together. They play an important role both in mitosis and meiosis. In mitosis, all cohesin complexes present on the chromosomes are removed before the start of the anaphase stage.
Cohesin complexes in Meiotic Division
Meiosis involves two distinct rounds of chromosomal segregation and cell divisions— Meiosis I followed by Meiosis II – producing four daughter cells. Meiosis I includes the separation of...
Cohesin complexes in Meiotic Division
Meiosis involves two distinct rounds of chromosomal segregation and cell divisions— Meiosis I followed by Meiosis II – producing four daughter cells. Meiosis I includes the separation of...
5.9K
Separation of Sister Chromatids
4.7K
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...
4.7K
