コヘシン:姉妹染色体の早期分離を防ぐ染色体タンパク質
C Michaelis1, R Ciosk, K Nasmyth
1Research Institute of Molecular Pathology, Vienna, Austria.
Cell
|October 23, 1997
まとめ
Smc1p,Smc3p,Scc1pを含む3つの染色体タンパク質は,酵母における早期の姉妹染色体分離を防ぐ. Scc1ppは,Scc1pが,Scc1pが,Scc1pが,Scc1pが,Scc1pが,Scc1pが,Scc1pが,Scc1pが,Scc1pが,Scc1pが,Scc1pが,Scc1pが,Scc1pが,Scc1pが,Scc1pが,Scc1pが,Scc1pが,Scc1pが,Scc1pが,Scc1pが,Scc1pが,Scc1pが,Scc1pが,Scc1pが,Scc1pが,Scc1pが,Scc1pが,Scc1pが,Scc1pが,Scc1pが,Scc1pは,Scc1pが,Scc1pは,Scc1pが,Scc1pは,Scc1pが,Scc1pは,Scc1pが,Scc1pは
科学分野:
- 細胞生物学 細胞生物学
- 遺伝学 遺伝学とは
- 分子生物学は分子生物学である.
背景:
- 姉妹染色体凝結は,細胞分裂中の正確な染色体分離に不可欠です.
- 凝結性の喪失はアナフェーズを誘発し,姉妹染色体の分離につながります.
研究 の 目的:
- 酵母における姉妹染色体結合を維持するタンパク質を特定し,特徴づけること.
- SMCファミリータンパク質と新しいタンパク質であるScc1pが,この過程で果たす役割を明らかにする.
主な方法:
- 酵母遺伝学と分子生物学技術が採用されました.
- 染色体タンパク質の分析と特徴づけが行われました.
主要な成果:
- Smc1pとSmc3p (SMCファミリー) とScc1pが,早すぎる姉妹染色体分離を防ぐ重要なタンパク質として特定されました.
- Scc1pはS相においてクロマチンを結合し,メタフェーズからアナフェーズへの移行時に解離する.
- アナフェーズ促進複合体によるScc1pの分解は,染色体の分離に不可欠である.
- Scc1pとクロマチンの関連性は,Smc1pに依存している.
結論:
- 新しいタンパク質であるScc1pは,姉妹染色体の結合と分離を調節する上で重要な役割を果たしています.
- Scc1pのホモログは,様々な真核生物に存在し,保存された凝結機構を示唆しています.
- 共通の結合装置は,真核生物のミトーシスとメオシスの両方に作用する.
関連する概念動画
Cohesins
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...
Condensins
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...
Separation 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...
Cohesins
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...
Condensins
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...
Separation 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...


