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相关概念视频

Replication in Prokaryotes01:32

Replication in Prokaryotes

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DNA replication has three main steps: initiation, elongation, and termination. Replication in prokaryotes begins when initiator proteins bind to the single origin of replication (ori) on the cell's circular chromosome. Replication then proceeds around the entire circle of the chromosome in each direction from the two replication forks, resulting in two DNA molecules.
Many Proteins Work Together to Replicate the Chromosome
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Replication in Eukaryotes01:29

Replication in Eukaryotes

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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.
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Recombinant DNA

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Overview
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The Replisome03:01

The Replisome

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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...
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Conservative Site-specific Recombination and Phase Variation02:53

Conservative Site-specific Recombination and Phase Variation

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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.
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Updated: May 24, 2025

Plasmid-derived DNA Strand Displacement Gates for Implementing Chemical Reaction Networks
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工程等离子体具有复制的合成起源.

Baiyang Liu1, Xiao Peng1, Matthew R Bennett2,3,4

  • 1Graduate Program in Systems, Synthetic, and Physical Biology, Rice University, Houston, 77005, TX, USA.

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概括

研究人员为等离子体设计了复制的合成起源 (SynORI),使可定制的复制数和模块化控制成为可能. 这一进步为微生物中的合成生物学应用提供了一个新的生物技术.

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科学领域:

  • 合成生物学 合成生物学
  • 分子生物学分子生物学
  • 生物技术是生物技术.

背景情况:

  • 等离子体对于将工程DNA传递给微生物至关重要,但受到自然复制机制的限制.
  • 由于依赖固有的复制过程,现有的等离子体缺乏可调性,兼容性和模块性.

研究的目的:

  • 为了提高塑体控制,重新构建自然的pMB1复制起源.
  • 开发可定制和独立控制的复制号码的合成复制起源 (SynORI).
  • 为了证明SynORI在生物技术应用中的模块化和信号响应性.

主要方法:

  • 重构复制的pMB1起源以创建可调节组件.
  • 设计合成RNA调节器,以独立控制原产地活动.
  • 工程 SynORI 响应各种环境信号,用于多重报告.
  • 在大肠杆菌中构建和维护一个直角SynORI等离子体库.

主要成果:

  • 可定制的等离子体拷贝数是通过调整重构组件来实现的.
  • 使用合成RNA调节器创建了与独立复制控制相容的起源.
  • 赛诺瑞展示了模块化工程,用于响应信号的,基于副本的报告.
  • 一个六个正交的SynORI等离子体库在大肠杆菌中成功共存了一个星期.

结论:

  • 复制的合成起源 (SynORI) 为合成生物学提供了一个可行的和强大的新生物技术.
  • 重构和合成起源为基于等离子体的系统提供了增强的可调性,兼容性和模块化.
  • SynORI能够精确控制等离子体复制数,并促进复杂的遗传电路设计.