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相关概念视频

Translesion DNA Polymerases02:10

Translesion DNA Polymerases

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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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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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Eukaryotic RNA Polymerases00:58

Eukaryotic RNA Polymerases

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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.
All three eukaryotic RNAPs require specific transcription factors, of which the...
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RNA Polymerase II Accessory Proteins02:36

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Proteins that regulate transcription can do so either via direct contact with RNA Polymerase or through indirect interactions facilitated by adaptors, mediators, histone-modifying proteins, and nucleosome remodelers. Direct interactions to activate transcription is seen in bacteria as well as in some eukaryotic genes. In these cases, upstream activation sequences are adjacent to the promoters, and the activator proteins interact directly with the transcriptional machinery. For example, in...
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DNA as a Genetic Template02:05

DNA as a Genetic Template

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Two structural features of the DNA molecule provide a basis for the mechanisms of heredity: the four nucleotide bases and its double-stranded nature. The Watson-Crick model of double-helical DNA structure, proposed in 1952, drew heavily upon the X-ray crystallography work of researchers Rosalind Franklin and Maurice Wilkins. Watson, Crick, and Wilkins jointly received the Nobel Prize in Physiology or Medicine for their work in 1962. Franklin was, controversially, excluded from the prize for...
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相关实验视频

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Genome-wide Purification of Extrachromosomal Circular DNA from Eukaryotic Cells
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循环顺序工程提高了Bst DNA聚合酶的放大效率.

Rong Xiang1, GuangYi Liu2, YanRu Wang1

  • 1School of Food Science and Engineering, South China University of Technology, Guangzhou, 510640, China.

International journal of biological macromolecules
|February 13, 2026
PubMed
概括

研究人员设计了一种新的DNA聚合酶 (CP-G23),用于增强核酸检测. 这种聚合酶简化了原料设计,并消除了循环介导同热放大 (LAMP) 试验中逆转录酶的需要.

关键词:
Bst DNA 聚合酶是一种循环变换是一个循环变换.抑制剂的耐受性 抑制剂的耐受性循环介导的同热放大 (LAMP)反转录LAMP (RT-LAMP) 是一个反转录LAMP.

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科学领域:

  • 分子生物学分子生物学
  • 生物技术是生物技术.
  • 诊断检测试验 诊断检测试验

背景情况:

  • 化学Bst DNA聚合酶 (HpStBL) 显示出核酸检测的希望,但面临着局限性.
  • 复杂的原料设计和不特定的放大阻碍了HpStBL在循环介导同热放大 (LAMP) 中的更广泛应用.

研究的目的:

  • 为循环介导同热放大 (LAMP) 和逆转录LAMP (RT-LAMP) 开发改进的DNA聚合酶.
  • 创建一个简化,快速的核酸检测方法,提高性能.

主要方法:

  • 通过改变HpStBL.BL的Hp47-Sto7d域,产生了四种循环变异 (CP) Bst DNA聚合酶突变体.
  • 评估了突变者的DNA合成和逆转录酶活性.
  • 开发了一种使用CP-G23突变体和Thermus thermophilus重组酶的核酸检测系统.

主要成果:

  • 循环变异改变了蛋白质的疏水性和DNA亲和性,产生了具有DNA合成和逆转录酶活性的突变物.
  • 突变CP-G23表现出卓越的放大性能,检测到低至10副本/μL的天体病毒等离子体DNA.
  • 基于CP-G23的系统成功地在45分钟内使用单一的原始对扩大了Astroviruses DNA和SARS-CoV-2 RNA,而不需要逆转录酶.

结论:

  • 循环顺序是改善LAMP试验中的DNA聚合酶性能的一个有效策略.
  • 新型CP-G23聚合酶和相关检测方法为DNA/RNA检测提供了一种简化,快速和敏感的方法.
  • 这种方法在临床诊断和分子测试方面具有重大潜力.