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相关概念视频

Bacterial RNA Polymerase00:43

Bacterial RNA Polymerase

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Unlike eukaryotes, bacteria use a single RNA Polymerase (RNAP) to transcribe all genes. The different subunits of bacterial RNAPhave distinct functions. The multisubunit structure of the bacterial RNAP helps the enzyme to maintain catalytic function, facilitate assembly, interact with DNA and RNA, and self-regulate its activity.
In most genes, the transcription site is a single base present upstream of the coding sequence. Though RNAP is a catalytically efficient enzyme, it does not recognize...
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Translesion DNA Polymerases02:10

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Translesion (TLS) polymerases rescue stalled DNA polymerases at sites of damaged bases by replacing the replicative polymerase and installing a nucleotide across the damaged site. Doing so, TLS allows additional time for the cell to repair the damage before resuming regular DNA replication.
TLS polymerases are found in all three domains of life - archaea, bacteria, and eukaryotes. Of the different classes of TLS polymerases, members of the Y family are fitted with specialized structures that...
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Genomic DNA in Eukaryotes00:58

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Eukaryotes have large genomes compared to prokaryotes. To fit their genomes into a cell, eukaryotic DNA is packaged extraordinarily tightly inside the nucleus. To achieve this, DNA is tightly wound around proteins called histones, which are packaged into nucleosomes that are joined by linker DNA and coil into chromatin fibers. Additional fibrous proteins further compact the chromatin, which is recognizable as chromosomes during certain phases of cell division.
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Overview
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RNA Polymerase (RNAP) is conserved in all animals, with bacterial, archaeal, and eukaryotic RNAPs sharing significant sequence, structural, and functional similarities. Among the three eukaryotic RNAPs, RNA Polymerase II is most similar to bacterial RNAP in terms of both structural organization and folding topologies of the enzyme subunits. However, these similarities are not reflected in their mechanism of action.
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RNA polymerase (RNAP) carries out DNA-dependent RNA synthesis in both bacteria and eukaryotes. Bacteria do not have a membrane-bound nucleus. So, transcription and translation occur simultaneously, on the same DNA template.
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Strand-Specific Analysis of Proteins at Replicating DNA Strands by Enrichment and Sequencing of Protein-Associated Nascent DNA Method
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在公开的单细胞转录组数据中选尤格伦诺佐亚特异性的DNA聚合酶.

Ryo Harada1, Yuji Inagaki2

  • 1Graduate School of Life and Environmental Sciences, University of Tsukuba, Japan.

Protist
|December 1, 2023
PubMed
概括
此摘要是机器生成的。

研究人员利用新的转录组数据在Euglenozoa中探索了家族A DNA聚合酶 (famA DNAPs). 这项研究揭示了这一类的深层进化分支中的新奇的famA DNAP多样性.

关键词:
这是一种双烯.尤格莱尼达 (Euglenida) 是一个基内托塑 (Kinetoplastea) 是一种有机物.侧向基因转移是指侧向基因转移.菌体是一种菌体.这是Symbiontida.

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科学领域:

  • 分子生物学分子生物学
  • 进化生物学 进化生物学
  • 基因组学就是基因组学.

背景情况:

  • 甲家族DNA聚合酶 (famA DNAPs) 是各种生物体 (包括真核生物) 中发现的关键酶,通常在有机体中起作用.
  • 尤格莱诺动物表现出多种不同的famA DNAP类型 (PolIA,PolIBCD+,POP,eugPolA),但由于序列数据有限,它们的进化历史,特别是基底系,仍然不太清楚.
  • 之前的研究缺乏在Euglenozoa的多样性中进行全面的抽样,这在理解famA DNAP演变方面留下了空白.

研究的目的:

  • 研究Euglenozoa.phylum中的A家族DNA聚合酶 (famA DNAPs) 的进化历史和多样性.
  • 通过分析单细胞转录组数据来解决深分支Euglenozoa中缺乏序列数据的问题.
  • 为了提供一个最新的了解famA DNAP在Euglenozoa.

主要方法:

  • 利用了来自类欧格林类和共生类的单细胞转录组数据.
  • 鉴定和分析了16个新的家族A DNA聚合酶 (famA DNAP) 序列.
  • 进行了比较分析,重建了Euglenozoa中famA DNAPs的进化模式.

主要成果:

  • 从新分析的转录组数据中发现了16个新的famA DNAP序列.
  • 扩大了已知的famA DNAPs的多样性,在以前代表性不足的基底Euglenozoa血统中.
  • 提供了新的分子数据,以填补Euglenozoa.famA DNAPs进化记录中的空白.

结论:

  • 这项研究显著提高了我们对famA DNAP多样性和Euglenozoa进化的理解.
  • 来自菌和共生欧格莱尼的新数据揭示了这些关键酶在早期分离的血统中的进化轨迹.
  • 这项研究有助于更完整地了解真核细胞DNA聚合酶进化.