コヘシンが染色体に負荷される証拠は,そのSMCのヒンジを開くことを含みます
Stephan Gruber1, Prakash Arumugam, Yuki Katou
1Institute of Molecular Pathology, Dr. Bohr-Gasse 7, 1030 Vienna, Austria.
Cell
|November 4, 2006
まとめ
コヘシンはコヘシンのことです.
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:
- コヘシンは,細胞分裂中の姉妹染色体結合に不可欠なタンパク質複合体です.
- Smc1,Smc3およびScc1サブユニットを含むリング状の構造を形成します.
- DNAがコヘシンによって閉じ込められるメカニズムは,研究の対象となっている.
研究 の 目的:
- クロモソームとの関連におけるコヘシンのヒンジドメインの役割を調査する.
- DNAがコヘシンリングに入るメカニズムを決定する.
主な方法:
- コヘシンのヒンジドメインとScc1サブユニットの実験操作.
- コヘシンの染色体関連性への影響を評価する.
主要な成果:
- コヘシンのヒンジドメインは,染色体との関連に不可欠です.
- 人工的にヒンジドメインの関連性を維持することで,DNAの結合を阻害する.
- Scc1の解離を防ぐことは,DNA結合を妨げない.
結論:
- コヘシンのヒンジドメインは,染色体結合に欠かせないものであり,単に二分化だけではない.
- コヘシンリングへのDNAの侵入は,Smc1/Smc3ヒンジドメインの一時的な解離を必要とします.
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...
Attachment 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...
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...
Attachment 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...
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...


