在Entamoeba histolytica中发生了表位和染色体DNA复制和重组
1Department of Biology, Ashoka University, Sonipat, Haryana, India.
Frontiers in molecular biosciences
|June 26, 2023
概括
在Entamoeba histolytica中,DNA复制涉及多个发源在情节性rDNA和各种聚合酶上进行修复. 像EhRad51和EhDmc1这样的特征蛋白表明同源的重组组合.
科学领域:
- 分子生物学分子生物学
- 寄生虫学的寄生虫学
- 遗传学 是一个遗传学.
背景情况:
- Entamoeba histolytica会导致氨核病.
- 早期的研究重点在于在病例循环上的核糖体RNA基因.
- 这些rDNA循环缺乏固定的起源,复制从多个地点开始.
研究的目的:
- 研究Entamoeba histolytica中的DNA复制和重组机制.
- 识别和描述参与这些过程的关键蛋白质.
- 探索寄生虫生长,阶段转换和药物向中的潜在作用.
主要方法:
- 序列分析以确定复制和重组蛋白质的同类.
- 鉴定出蛋白质的生物化学表征,包括DNA聚合酶和结合酶.
- 测试聚合酶活性,链位移,转化合成和链交换.
- 使用反向重复序列和应力条件对重组的研究.
主要成果:
- 在情节性rDNA上确定了多个复制起源,根据生长条件而有所不同.
- 发现了真核DNA聚合酶 (α, δ, ε, Rev1, Rev3,家族A, B2) 和DNA结合酶I的同类.
- 生物化学分析证实了聚合酶和外核酶活动,以及转化合成能力.
- 鉴定了EhRad51和EhDmc1的重组酶,表明可能发生化.
- 在压力下和在Entamoeba invadens. encystation期间,同源重组增强.
结论:
- Entamoeba histolytica 具有复杂的DNA复制和重组机制.
- 同源性重组可能在寄生虫生长和阶段转换中起着至关重要的作用.
- 鉴定出来的蛋白质代表了新型抗阿梅比克药物开发的有价值的目标.
相关概念视频
Replication in Eukaryotes
14.0K
In eukaryotic cells, DNA replication is highly conserved and tightly regulated. Multiple linear chromosomes must be duplicated with high fidelity before cell division, so there are many proteins that fulfill specialized roles in the replication process. Replication occurs in three phases: initiation, elongation, and termination, and ends with two complete sets of chromosomes in the nucleus.
Many Proteins Orchestrate Replication at the Origin
Eukaryotic replication follows many of the same...
Many Proteins Orchestrate Replication at the Origin
Eukaryotic replication follows many of the same...
14.0K
Replication in Prokaryotes
87.7K
Overview
87.7K
DNA Replication
49.9K
DNA replication involves the separation of the two strands of the double helix, with each strand serving as a template from which the new complementary strand is copied. After replication, each double-stranded DNA includes one parental or “old” strand and one “new” strand. This is known as semiconservative replication. The resulting DNA molecules have the same sequence and are divided equally into the two daughter cells.
Replication in Prokaryotes
DNA replication...
Replication in Prokaryotes
DNA replication...
49.9K
Chromosome Replication
8.8K
Before a cell can divide, it must accurately replicate all of its chromosomes, including the DNA and its associated histone and non-histone proteins. This process begins at numerous origins of replication during the S phase of the cell cycle in each of a cell’s chromosomes simultaneously. Certain nucleotides can act as origins of replication, but these sequences are not well defined - especially in complex, multi-cellular, eukaryotic species. The length of DNA that spans an origin...
8.8K
Homologous Recombination
50.7K
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...
50.7K
The Replisome
33.9K
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 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...
33.9K


