セパラーゼはミトーシス染色体に誘導され,DNAに依存した方法で姉妹染色体の結束を溶かす
Yuxiao Sun1, Martin Kucej, Heng-Yu Fan
1Department of Molecular Biology, University of Texas Southwestern Medical Center, 5323 Harry Hines Blvd., Dallas, TX 75390, USA.
Cell
|April 7, 2009
まとめ
DNAは,細胞分裂中のセパレージによるコヘシン分裂に不可欠です. このメカニズムは,染色体に関連したコヘシンが割れ,溶解可能なコヘシンが無傷のままであることを保証します.
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:
- 姉妹染色体分離は細胞分裂に不可欠であり,分離酵素によるコヘシン分裂によって媒介されます.
- セパラーゼによるコヘシン分裂の正確な生化学的メカニズムと空間的調節は完全に理解されていません.
研究 の 目的:
- ヒト分離酵素によるコヘシン分裂の生化学的メカニズムにおけるDNAの役割を明らかにする.
- ミトーシス中のヒト細胞内のセパラーゼ活性における空間的調節を調査する.
主な方法:
- DNAへのセパラーゼ結合とタンパク質分解活性を評価するためのインビトロ生化学測定法.
- 人間の細胞におけるセパレージの細胞局所化研究.
- コヘシン分裂感度を評価するためにミトスの染色体での核酸処理実験.
主要な成果:
- 人間の分離は,コヘシン分裂のためにシーケンスを特定しない方法でDNAを必要とします.
- DNAは,分離と結合の相互作用を媒介する架け橋として機能します.
- セパラーゼはミトーシス染色体に局所化し,染色体関連コヘシンの分裂はDNA依存性 (ニュクレアゼ処理に敏感) である.
結論:
- DNAは,分離酵素によるコヘシン分裂の空間的および生化学的調節における重要な要因である.
- DNAブリッジングメカニズムは,アナフェーズ中に染色体関連コーゼインの特定の割れ目を説明し,溶解可能なコーゼインを無傷のまま残します.
関連する概念動画
02:20Cohesins
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 homologous...
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 homologous...
02:15Condensins
Condensins are large protein complexes that use ATP to fuel the assembly of chromosomes during mitosis. They transform the tangled, shapeless mass of post-interphase DNA into individualized chromosomes by compacting, organizing, and segregating chromosomal DNA.
The plant and animal cells contain two types of condensin complexes—condensin I and condensin II. Both complexes have five subunits: two SMC (Structural Maintenance of Chromosomes) subunits, a kleisin subunit, and two HEAT-repeat...
The plant and animal cells contain two types of condensin complexes—condensin I and condensin II. Both complexes have five subunits: two SMC (Structural Maintenance of Chromosomes) subunits, a kleisin subunit, and two HEAT-repeat...
02:17Separation of Sister Chromatids
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...
02:20Cohesins
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 homologous...
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 homologous...
02:15Condensins
Condensins are large protein complexes that use ATP to fuel the assembly of chromosomes during mitosis. They transform the tangled, shapeless mass of post-interphase DNA into individualized chromosomes by compacting, organizing, and segregating chromosomal DNA.
The plant and animal cells contain two types of condensin complexes—condensin I and condensin II. Both complexes have five subunits: two SMC (Structural Maintenance of Chromosomes) subunits, a kleisin subunit, and two HEAT-repeat...
The plant and animal cells contain two types of condensin complexes—condensin I and condensin II. Both complexes have five subunits: two SMC (Structural Maintenance of Chromosomes) subunits, a kleisin subunit, and two HEAT-repeat...
02:17Separation of Sister Chromatids
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...