索罗林通过对抗Wapl来调解姐妹染色体凝聚力
Tomoko Nishiyama1, Rene Ladurner, Julia Schmitz
1Research Institute of Molecular Pathology, Vienna, Austria.
Cell
|November 30, 2010
概括
索罗林蛋白通过抑制Wapl,一种将凝聚素与DNA分离的蛋白质,来维持姐妹染色体的凝聚力. 这种对染色体分离至关重要的机制在各个物种中都存在.
科学领域:
- 分子生物学分子生物学
- 细胞生物学 细胞生物学
- 遗传学 是一个遗传学.
背景情况:
- 姐妹染色体凝聚力,由凝聚素介导,对于细胞分裂期间精确的染色体分离至关重要.
- 蛋白质Wapl逆转了凝聚素-DNA相互作用,而稳定的结合被认为是保持凝聚力的.
- 索罗林是一种脊椎动物蛋白质,对稳定的凝聚素-DNA相互作用至关重要,但其作用机制尚不清楚.
研究的目的:
- 阐明索罗林维持姐妹染色体凝聚力的分子机制.
- 调查索罗林,凝聚素,Wapl和Pds5.5之间的相互作用.
- 为了确定索罗林的功能是否在无脊椎动物中保持.
主要方法:
- 生物化学测试用于研究蛋白质-DNA相互作用.
- 同免疫沉用于分析蛋白质复合体.
- 在Drosophila melanogaster中进行功能测试,以评估体内凝聚力.
主要成果:
- DNA复制和凝聚素乙化有助于索罗林与凝聚素结合.
- 索罗林将Wapl从其有约束力的合作伙伴Pds5.5中取代.
- 当Wapl缺席时,Sororin对于凝聚力是不可或缺的.
- 一种与索罗林相关的蛋白质,达尔马提亚,对于Drosophila的凝聚力至关重要.
结论:
- 索罗林通过抑制Wapl从DNA中脱离凝聚素来保持凝聚力.
- 索罗林的作用机制在无脊椎动物中得到保护,这表明它在染色体生物学中起着根本作用.
相关概念视频
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...
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...
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...
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...


