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Cohesins02:20

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...
Separation of Sister Chromatids02:17

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...
The Contractile Ring02:15

The Contractile Ring

Contractile rings are composed of microfilaments and are responsible for separating the daughter cells during cytokinesis. Contractile ring assembly proceeds along with other cell cycle events; however, very few mechanistic details are known about the timing and coordination of the contractile rings with the cell cycle.
A small GTPase, RhoA, controls the function and assembly of the contractile ring. RhoA belongs to the Ras superfamily of proteins. The activation of formins by RhoA promotes...
Cohesins02:20

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...
Separation of Sister Chromatids02:17

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...
The Contractile Ring02:15

The Contractile Ring

Contractile rings are composed of microfilaments and are responsible for separating the daughter cells during cytokinesis. Contractile ring assembly proceeds along with other cell cycle events; however, very few mechanistic details are known about the timing and coordination of the contractile rings with the cell cycle.
A small GTPase, RhoA, controls the function and assembly of the contractile ring. RhoA belongs to the Ras superfamily of proteins. The activation of formins by RhoA promotes...

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関連する実験動画

Updated: May 11, 2026

Spatiotemporal Analysis of Cytokinetic Events in Fission Yeast
11:19

Spatiotemporal Analysis of Cytokinetic Events in Fission Yeast

Published on: February 20, 2017

染色体コヘシンがリングを形成する.

Stephan Gruber1, Christian H Haering, Kim Nasmyth

  • 1Research Institute of Molecular Pathology, Dr Bohr-Gasse 7, 1030 Vienna, Austria.

Cell
|March 26, 2003
PubMed
まとめ
この要約は機械生成です。

コヘシン複合体は,姉妹染色体の結束に不可欠なリング構造を形成する. その裂け目の断片は結びついているままであり,細胞分裂時にクロモソームからコヘシンがどのように分離するかを明らかにします.

さらに関連する動画

Examination of Mitotic and Meiotic Fission Yeast Nuclear Dynamics by Fluorescence Live-cell Microscopy
12:04

Examination of Mitotic and Meiotic Fission Yeast Nuclear Dynamics by Fluorescence Live-cell Microscopy

Published on: June 24, 2019

Capturing Chromosome Conformation Across Length Scales
10:15

Capturing Chromosome Conformation Across Length Scales

Published on: January 20, 2023

関連する実験動画

Last Updated: May 11, 2026

Spatiotemporal Analysis of Cytokinetic Events in Fission Yeast
11:19

Spatiotemporal Analysis of Cytokinetic Events in Fission Yeast

Published on: February 20, 2017

Examination of Mitotic and Meiotic Fission Yeast Nuclear Dynamics by Fluorescence Live-cell Microscopy
12:04

Examination of Mitotic and Meiotic Fission Yeast Nuclear Dynamics by Fluorescence Live-cell Microscopy

Published on: June 24, 2019

Capturing Chromosome Conformation Across Length Scales
10:15

Capturing Chromosome Conformation Across Length Scales

Published on: January 20, 2023

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:

  • コヘシン複合体は,ミトーシス中の姉妹染色体の結束を維持するために不可欠です.
  • コヘシンは Smc1,Smc3,Scc1のサブユニットで構成され,環状の構造を形成します.
  • Scc1の分離酵素媒介分裂は,アナフェーズ発症時にコヘシン放出を誘発する.

研究 の 目的:

  • コヘシンが in vivo で完全なリング構造を形成するかどうかを調査する.
  • アナフェーズ中の染色体からのコヘシン放出のメカニズムを解明する.

主な方法:

  • Scc1分裂後のコヘシン亜単位相互作用の分析.
  • コヘシン放出におけるSmc3コイルドコイル割れの役割を調査する.

主要な成果:

  • Scc1の割れ断片は,Smc1/Smc3ヘテロダイマーと関連している.
  • Smc3のコイルを割っただけで,染色体からコヘシンを放出するのに十分です.
  • 姉妹染色体凝結の喪失は,コヘシン放出と相関する.

結論:

  • コヘシンの環構造は,Scc1断片とSmc1/Smc3ヘテロジマーとの相互作用によって維持される.
  • Smc3のコイルされたコイルによって媒介されるクロマチンとのトポロジカルな関連は,コヘシンの機能にとって非常に重要です.