相关实验视频
Updated: Jun 25, 2026
14:23
Recombineering Homologous Recombination Constructs in Drosophila
Published on: July 13, 2013
催化高区域和立体选择性分子间还原性基因与合基因的合
Chun-Chih Wang1, Pao-Shun Lin, Chien-Hong Cheng
1Department of Chemistry, Tsing Hua University, Hsinchu, Taiwan 300, China.
Journal of the American Chemical Society
|August 15, 2002
概括
一种新的催化反应使得和的还原性合成为可能,产生具有高区域和立体选择性的特定产品. 这个过程为复杂的有机分子提供了一条新的合成路线.
科学领域:
- 有机化学 有机化学
- 催化剂是一种催化剂.
- 合成方法论 合成方法论
背景情况:
- 在有机合成中,开发高效和选择性的碳-碳键形成方法至关重要.
- 催化还原性合反应提供了一种强大的方法来构建复杂的分子架构.
- 现有的方法往往缺乏所需的区域和立体选择性,限制了它们的合成效用.
研究的目的:
- 开发各种基和缺电子基之间的新型催化还原合反应.
- 调查这个新开发的ene-yne催化反应的区域和立体选择性.
- 通过同位素标记研究来阐明反应机制.
主要方法:
- 多种基因与缺电子基因在催化剂 (Co(PPh3) 2I2),三 (PPh3),水和粉在乙中反应.
- 使用标准有机化学技术对反应产物的分析,以确定产量,区域和立体选择性.
- 使用D2O进行标记实验,以追踪产品中特定原子的起源并了解反应机制.
主要成果:
- 催化还原合顺利进行,以相当到优异的产量提供所需的产品.
- 该反应表现出高的区域和立体选择性,每个转换只观察到一个同位素.
- 同位素标记证实了特定位置的化,为反应途径提供了洞察力.
结论:
- 已经建立了一种新且高效的基和缺电子基的催化还原合.
- 该反应显示出对区域和立体选择性的极佳控制,使其成为一种有价值的合成工具.
- 拟议的机制提供了对这种选择性能量催化过程的机制理解.
相关概念视频
02:31Homologous 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...
02:08Gene Conversion
Other than maintaining genome stability via DNA repair, homologous recombination plays an important role in diversifying the genome. In fact, the recombination of sequences forms the molecular basis of genomic evolution. Random and non-random permutations of genomic sequences create a library of new amalgamated sequences. These newly formed genomes can determine the fitness and survival of cells. In bacteria, homologous and non-homologous types of recombination lead to the evolution of new...
02:53Conservative 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...
The recognition sites for Cre recombinase called LoxP...
02:08Gene Conversion
Other than maintaining genome stability via DNA repair, homologous recombination plays an important role in diversifying the genome. In fact, the recombination of sequences forms the molecular basis of genomic evolution. Random and non-random permutations of genomic sequences create a library of new amalgamated sequences. These newly formed genomes can determine the fitness and survival of cells. In bacteria, homologous and non-homologous types of recombination lead to the evolution of new...
01:30Crossing Over
Crossing over is the exchange of genetic information between homologous chromosomes during prophase I of meiosis I. Genetic recombination gives rise to allelic diversity in the newly formed daughter cells. In humans, crossing over produces genetically distinct haploid egg and sperm cells that undergo fertilization to produce unique offspring. Before cell division starts, the germ cell’s chromosome(s) undergo duplication in the S phase of the cell cycle. As the cells enter prophase I, duplicated...