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相关概念视频

DNA as a Genetic Template02:05

DNA as a Genetic Template

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Two structural features of the DNA molecule provide a basis for the mechanisms of heredity: the four nucleotide bases and its double-stranded nature. The Watson-Crick model of double-helical DNA structure, proposed in 1952, drew heavily upon the X-ray crystallography work of researchers Rosalind Franklin and Maurice Wilkins. Watson, Crick, and Wilkins jointly received the Nobel Prize in Physiology or Medicine for their work in 1962. Franklin was, controversially, excluded from the prize for...
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DNA Helicases00:55

DNA Helicases

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DNA unwinding helicase enzymes are a type of motor protein. Motor proteins can translocate along filaments or polymers using energy generated from ATP hydrolysis. Helicases are involved in all the important cellular processes where DNA unwinding is required, such as DNA replication, repair, recombination, and transcription. They are present in all living organisms, but vary in their structure, function, and mechanism of action. For example, in prokaryotes, DnaB helicase binds and translocates...
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DNA Topoisomerases02:02

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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. ...
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The DNA Helix01:16

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The DNA Replication Fork01:02

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An organism’s genome needs to be duplicated in an efficient and error-free manner for its growth and survival. The replication fork is a Y-shaped active region where two strands of DNA are separated and replicated continuously. The coupling of DNA unzipping and complementary strand synthesis is a characteristic feature of a replication fork.   Organisms with small circular DNA, such as E. coli, often have a single origin of replication; therefore, they have only two replication...
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相关实验视频

Updated: Sep 14, 2025

Studying DNA Looping by Single-Molecule FRET
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取决于温度的状DNA折叠景观.

Marc Rico-Pasto1,2, Marco Ribezzi-Crivellari3, Felix Ritort4,5,6

  • 1Unit of Biophysics and Bioengineering, Department of Biomedicine, School of Medicine and Health Sciences, University of Barcelona, C/Casanoves 143, 08036 Barcelona, Spain.

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概括

这项研究研究了DNA发针折叠,为GC和AT基对量化热容量变化 (ΔCp). 研究结果显示,过渡状态具有较低的配置,支持道式的核酸杂交的能量景观模型.

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科学领域:

  • 生物物理学的生物物理.
  • 分子生物学分子生物学
  • 热力学是一种热力学.

背景情况:

  • 核酸杂交对生物过程至关重要.
  • 凝聚力-的补偿效应使得理解DNA双重组的形成变得复杂.
  • 热容量变化 (ΔCp) 是量化这些效应的关键.

研究的目的:

  • 为了研究DNA的发针折叠,热力学和动力学.
  • 为了确定GC和AT债券的每个基数对的热容量变化 (ΔCp).
  • 分析过渡状态在核酸折叠景观中的作用.

主要方法:

  • 用一个温度跳跃的光学陷进行实验.
  • 应用运动分析和Clausius-Clapeyron方程的有效性.
  • 在温度范围 (5-40°C) 中研究了具有不同茎序列和循环大小的DNA针头.

主要成果:

  • 衍生 ΔCp 值为 GC 的 36 ± 3 卡路里/mol K 和 AT 基对的 29 ± 3 卡路里/mol K.
  • 在GC和AT基对形成时观察到类似的自由度.
  • 发现过渡状态与原始状态相比具有较高的自由能量和较低的 ΔCp 值.

结论:

  • 过渡状态表现出较低的配置,与道式的能源景观假设保持一致.
  • 该研究验证了核酸杂交和折叠的一般原则.
  • 过渡状态的 ΔCp 值对于理解这些过程至关重要.