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相关概念视频

Catalytically Perfect Enzymes01:07

Catalytically Perfect Enzymes

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The theory of catalytically perfect enzymes was first proposed by W.J. Albery and J. R. Knowles in 1976. These enzymes catalyze biochemical reactions at high-speed. Their catalytic efficiency values range from 108-109 M-1s-1. These enzymes are also called 'diffusion-controlled' as the only rate-limiting step in the catalysis is that of the substrate diffusion into the active site. Examples include triose phosphate isomerase, fumarase, and superoxide dismutase.
 
Most enzymes...
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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.
The recognition sites for Cre recombinase called LoxP...
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相关实验视频

Updated: May 30, 2025

Directed Evolution Method in Saccharomyces cerevisiae: Mutant Library Creation and Screening
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过氧化酶DNA酶的定向进化通过基于功能的方法.

Soubhagya K Bhuyan1,2, Weisi He1, Jingyu Cui1

  • 1School of Biomedical Sciences, LKS Faculty of Medicine, The University of Hong Kong, Hong Kong SAR, P.R. China.

Biology methods & protocols
|January 31, 2025
PubMed
概括

研究人员开发了一种新的实验室进化方法来增强过氧化酶DNA酶 (催化DNA分子). 这种技术提高了它们的催化率,克服了在医学和化学领域更广泛应用的局限性.

关键词:
这些DNAzymes是DNAzymes.在G-quadruplex中使用.催化核酸的催化核酸.进化 演化 演化 演化 演化 演化 演化 演化过氧化酶是DNA酶的一种.自己生物化DNA的DNA.自己生物化反应的反应.

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科学领域:

  • 生物化学 生物化学
  • 分子生物学分子生物学
  • 合成生物学 合成生物学

背景情况:

  • 过氧化酶DNA酶是具有催化活性的G-四重复结构,具有稳定性和易于合成等优势.
  • 目前对催化速率的限制阻碍了它们在医学,生物学和化学中的应用.
  • 现有的选择方法往往将亲和力优先于动力学,这使得更快的DNAzymes的进化变得复杂.

研究的目的:

  • 介绍基于功能的实验室进化方法的详细协议,以增强过氧化酶DNA酶.
  • 为了使DNAzyme变体的发现能够获得更好的催化速率.
  • 为了促进未来的实验室实验室实施催化DNA的定向进化.

主要方法:

  • 一种利用内在过氧化酶活性催化自生物化的定向进化方法,用于DNA酶选择.
  • 基于光的DNA池的实时监测,以跟踪和丰富催化活性.
  • 进化选择循环捕获和放大催化活性DNA分子.

主要成果:

  • 成功进化了一种新的过氧化酶DNA酶 (mSBDZ-X-3),具有增强的催化性能.
  • 进化的mSBDZ-X-3DNA酶表现出一个平行G-四重复结构.
  • 与先前进化的DNAzyme变体相比,证明了更好的催化性能.

结论:

  • 提出的协议使得从各种核酸库中发现改进的过氧化酶DNAzyme/RNAzyme变体.
  • 这种基于功能的进化方法可用于在各种定向分子进化环境中选择催化活动.
  • 该方法克服了传统选择压力的局限性,专注于动力增强.