相关实验视频
Updated: Jul 13, 2026
14:23
Recombineering Homologous Recombination Constructs in Drosophila
Published on: July 13, 2013
一个染色体重塑复合物,参与转录和DNA处理
X Shen1, G Mizuguchi, A Hamiche
1Laboratory of Molecular Cell Biology, National Cancer Institute, National Institutes of Health, Bethesda, Maryland 20892-4255, USA.
Nature
|August 22, 2000
概括
含有Ino80 ATPase的INO80复合物重塑染色质,有助于转录,并具有DNA螺旋酶活性. 突变者揭示了DNA损伤修复中的作用,将染色质重塑与基因组稳定性和基因表达联系起来.
科学领域:
- 分子生物学分子生物学
- 遗传学 是一个遗传学.
- 生物化学 生物化学
背景情况:
- 细胞基因组包装在染色质中为DNA处理酶创造了障碍.
- 具有SNF2/SWI2超级家族ATPase子单元的ATP依赖性染色体重塑复合物克服了这些障碍.
- 这些复合体增强了核细胞的移动性,对转录至关重要.
研究的目的:
- 为了识别染色体重塑复合物,涉及到超越转录的DNA交易.
- 分析SNF2/SWI2-和ISWI相关蛋白质的新型重塑复合体.
- 为了研究INO80复合体在Saccharomyces cerevisiae中的功能.
主要方法:
- 来自Saccharomyces cerevisiae的INO80复合物的净化.
- 生物化学测试以评估染色体重塑和DNA螺旋酶活性.
- 对ino80突变体进行对DNA破坏剂和转录缺陷的敏感性分析.
主要成果:
- 纯化的INO80复合物含有Ino80 ATPase和大约12个多,包括RuvB DNA螺旋酶相关的蛋白质.
- 该INO80复合体表现出染色体重塑活性,促进体外转录,并具有3'至5'DNA螺旋酶活性.
- ino80突变体对破坏DNA的药物过敏,并表现出转录缺陷.
结论:
- 由Ino80 ATPase驱动的染色体重塑与转录和DNA损伤修复途径有关.
- INO80复合体在维护基因组完整性和调节基因表达方面发挥着多方面的作用.
- 这项研究强调了染色质结构,DNA修复机制和转录调节之间的联系.
相关概念视频
01:09Recombinant DNA
Overview
02:31Homologous Recombination
The basic reaction of homologous recombination (HR) involves two chromatids that contain DNA sequences sharing a significant stretch of identity. One of these sequences uses a strand from another as a template to synthesize DNA in an enzyme-catalyzed reaction. The final product is a novel amalgamation of the two substrates. To ensure an accurate recombination of sequences, HR is restricted to the S and G2 phases of the cell cycle. At these stages, the DNA has been replicated already and the...
02:53Conservative Site-specific Recombination and Phase Variation
Because the DNA segments are cut and reorganized in a direction-specific manner, site-specific recombination has emerged as an efficient genetic engineering technique. Flippase and Cyclization recombinases or Flp and Cre, respectively, are two members of the tyrosine recombinase family derived from bacteriophages, that are used to mediate site-specific DNA insertions, deletions, and targeted expression of proteins in mammalian cell lines.
The recognition sites for Cre recombinase called LoxP...
The recognition sites for Cre recombinase called LoxP...
01:09Recombinant DNA
Overview
03:01The Replisome
DNA replication is carried out by a large complex of proteins that act in a coordinated matter to achieve high-fidelity DNA replication. Together this complex is known as the DNA replication machinery or the replisome.
The synthesis of the leading and lagging strands is a highly coordinated process. To explain this, the “Trombone model” was proposed by Bruce Alberts in 1980. The DNA loop formation starts when a primer is synthesized on the parent lagging strand. The loop grows with the...
The synthesis of the leading and lagging strands is a highly coordinated process. To explain this, the “Trombone model” was proposed by Bruce Alberts in 1980. The DNA loop formation starts when a primer is synthesized on the parent lagging strand. The loop grows with the...
02:31Homologous Recombination
The basic reaction of homologous recombination (HR) involves two chromatids that contain DNA sequences sharing a significant stretch of identity. One of these sequences uses a strand from another as a template to synthesize DNA in an enzyme-catalyzed reaction. The final product is a novel amalgamation of the two substrates. To ensure an accurate recombination of sequences, HR is restricted to the S and G2 phases of the cell cycle. At these stages, the DNA has been replicated already and the...