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相关概念视频

DNA Base Pairing02:27

DNA Base Pairing

Erwin Chargaff’s rules on DNA equivalence paved the way for the discovery of base pairing in DNA. Chargaff’s rules state that in a double-stranded DNA molecule,
Inheritance of Chromatin Structures03:17

Inheritance of Chromatin Structures

Epigenetics is the study of inherited changes in a cell's phenotype without changing the DNA sequences. It provides a form of memory for the differential gene expression pattern to maintain cell lineage, position-effect variegation, dosage compensation, and maintenance of chromatin structures such as telomeres and centromeres. For example, the structure and location of the centromere on chromosomes are epigenetically inherited. Its functionality is not dictated or ensured by the underlying DNA...
Homologous Recombination02:31

Homologous Recombination

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

Conservative Site-specific Recombination and Phase Variation

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...
Base-pairing and DNA Repair02:27

Base-pairing and DNA Repair

Erwin Chargaff’s rules on DNA equivalence paved the way for the discovery of base pairing in DNA. Chargaff’s rules state that in a double-stranded DNA molecule,
Homologous Recombination02:31

Homologous Recombination

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...

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相关实验视频

Updated: May 8, 2026

Analyzing and Building Nucleic Acid Structures with 3DNA
16:24

Analyzing and Building Nucleic Acid Structures with 3DNA

Published on: April 26, 2013

在整子重组中广泛的DNA特异性的结构基础.

Douglas MacDonald1, Gaëlle Demarre, Marie Bouvier

  • 1Laboratoire de Biochimie et Biophysique des Macromolécules, Département de Biologie Structurale et Chimie, CNRS URA 2171, Institut Pasteur, 75724 Paris Cedex 15, France.

Nature
|April 28, 2006
PubMed
概括

整合子整合酶通过识别DNA结构而不是序列来促进细菌DNA转移. 这种机制解释了细菌如何通过交换遗传物质来适应,比如耐药性基因.

科学领域:

  • 分子生物学分子生物学
  • 遗传学 是一个遗传学.
  • 微生物学 微生物学

背景情况:

  • 侧向DNA转移对于细菌的进化和适应至关重要.
  • 整合子整合酶在移动基因盒中的attI和attC位点之间调解DNA重组.
  • AttC站点缺乏序列保存,这表明结构识别机制.

研究的目的:

  • 阐明了对attC DNA的整合子整合酶识别的结构基础.
  • 了解细菌如何识别和结合外来遗传物质.

主要方法:

  • 结晶结构确定与attC基质结合的整合子整合酶.
  • 对DNA-蛋白相互作用和重组的结构决定因素的分析.

主要成果:

  • 整合酶通过结构特征来识别attC站点,特别是两个翻出来的基地.
  • DNA目标部位的识别和组装是独立于正规DNA序列的.
  • 在attC中不完美的二对称性导致基点翻转和识别.

结论:

  • 提出了一种用于细菌中序列退化DNA识别的新机制.
  • 这种结构识别机制促进了移动遗传元素的交换,影响了细菌的适应和进化.

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