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相关概念视频

Fixing Double-strand Breaks02:04

Fixing Double-strand Breaks

The double-stranded structure of DNA has two major advantages. First, it serves as a safe repository of genetic information where one strand serves as the back-up in case the other strand is damaged. Second, the double-helical structure can be wrapped around proteins called histones to form nucleosomes, which can then be tightly wound to form chromosomes. This way, DNA chains up to 2 inches long can be contained within microscopic structures in a cell. A double-stranded break not only damages...
DNA Topoisomerases02:02

DNA Topoisomerases

Topoisomerases are enzymes that relax overwound DNA molecules during various cell processes, including DNA replication and transcription. These enzymes regulate positive and negative DNA supercoiling without changing the nucleotide sequence. DNA overwinding in a clockwise direction results in positively supercoiled DNA, whereas underwinding in a counterclockwise direction produces negatively supercoiled DNA.
Types and Mechanism of action
Topoisomerases are divided into two main types.  Type I...
Single-Strand DNA Binding Proteins01:03

Single-Strand DNA Binding Proteins

For successful DNA replication, the unwinding of double-stranded DNA must be accompanied by stabilization and protection of the separated single strands of the DNA. This crucial task is performed by single-strand DNA-binding (SSB) proteins. They bind to the DNA in a sequence-independent manner, which means that the nitrogenous bases of the DNA need not be present in a specific order for binding of SSB proteins to it. The binding of SSB proteins straightens single-stranded DNA (ssDNA) and makes...
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...
Mismatch Repair01:20

Mismatch Repair

Organisms are capable of detecting and fixing nucleotide mismatches that occur during DNA replication. This sophisticated process requires identifying the new strand and replacing the erroneous bases with correct nucleotides. Mismatch repair is coordinated by many proteins in both prokaryotes and eukaryotes.
The Mutator Protein Family Plays a Key Role in DNA Mismatch Repair
The human genome has more than 3 billion base pairs of DNA per cell. Prior to cell division, that vast amount of genetic...
Mismatch Repair01:36

Mismatch Repair

Overview

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相关实验视频

Updated: Jun 8, 2026

Sequence-specific and Selective Recognition of Double-stranded RNAs over Single-stranded RNAs by Chemically Modified Peptide Nucleic Acids
09:04

Sequence-specific and Selective Recognition of Double-stranded RNAs over Single-stranded RNAs by Chemically Modified Peptide Nucleic Acids

Published on: September 21, 2017

对双重和三重DNA的非核酸环替代物的结构优化.

Squire Rumney1, Eric T Kool

  • 1Department of Chemistry, University of Rochester, Rochester, New York 14627.

Journal of the American Chemical Society
|September 28, 2010
PubMed
概括
此摘要是机器生成的。

乙烯糖醇寡合物稳定了DNA双重复和三重复. 优化的连接器比预期更长,提高了诊断探针和治疗剂的热稳定性.

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科学领域:

  • 合成生物学 合成生物学
  • 核酸化学的核酸化学
  • 生物物理化学 生物物理化学

背景情况:

  • 核酸环对于DNA结构和功能至关重要.
  • 现有的非核酸循环替代具有稳定性的局限性.
  • 乙烯糖醇 (EG) 寡合体具有作为稳定DNA链接体的潜力.

研究的目的:

  • 探索乙烯糖醇 (EG) 寡合体作为DNA中的非核酸环替代物的结构效应.
  • 为了合成和表征新的,结构优化的基于EG的链接器.
  • 评估这些链接器在DNA双重和三重复合中的稳定作用.

主要方法:

  • 用于自动化DNA合成的EG寡合物的合成,其衍生为光胺.
  • 将EG链接器纳入DNA双重和三重序列.
  • 热变性 (Tm) 分析以测量螺旋体稳定性.

主要成果:

  • 乙烯基醇) 连接器在双重体中提供了最大的热稳定性,性能优于自然的T4) 循环.
  • 八基 (乙烯基醇) (EG) 连接器在各种方向和目标丝长度的三重连接中显示出最高的稳定性.
  • 在某些三重配置中,EG(8) 连接的链表现出与自然T(5) 环相比或超过的结合亲和力.

结论:

  • 优化的乙烯糖醇寡合体作为有效的,稳定DNA中的非核酸循环替代.
  • 连接器长度至关重要,最佳长度超过了简单的几何预测.
  • 这些发现对于设计用于诊断,研究和治疗的合成核酸非常有价值.