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相关概念视频

The Replisome03:01

The Replisome

33.2K
DNA replication is carried out by a large complex of proteins that act in a coordinated matter to achieve high-fidelity DNA replication. Together this complex is known as the DNA replication machinery or the replisome.
The synthesis of the leading and lagging strands is a highly coordinated process. To explain this, the “Trombone model” was proposed by Bruce Alberts in 1980. The DNA loop formation starts when a primer is synthesized on the parent lagging strand. The loop grows with...
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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

DNA Topoisomerases

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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 Replication Fork01:02

The DNA Replication Fork

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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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Replication in Eukaryotes02:31

Replication in Eukaryotes

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Overview
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Extraction: Partition and Distribution Coefficients01:14

Extraction: Partition and Distribution Coefficients

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The distribution law or Nernst's distribution law is the law that governs the distribution of a solute between two immiscible solvents. This law, also known as the partition law, states that if a solute is added to the mixture of two immiscible solvents at a constant temperature, the solute is distributed between the two solvents in such a way that the ratio of solute concentrations in the solvents remains constant at equilibrium.
For extracting a solute from an aqueous phase into an...
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High-Speed Magnetic Tweezers for Nanomechanical Measurements on Force-Sensitive Elements
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High-Speed Magnetic Tweezers for Nanomechanical Measurements on Force-Sensitive Elements

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工作分配用于解压过程的分工.

Peter Werner1, Alexander K Hartmann1, Satya N Majumdar2

  • 1<a href="https://ror.org/033n9gh91">Institut für Physik, Universität Oldenburg</a>, 26111 Oldenburg, Germany.

Physical review. E
|September 19, 2024
PubMed
概括
此摘要是机器生成的。

本研究引入了DNA和RNA结构的拉链模型,分析了在外部力下相位过渡和工作分布. 这些发现揭示了关键力的不同行为,并提供了通过模拟验证的分析工作分布.

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Author Spotlight: Unraveling the Dynamics of Eukaryotic DNA Replication Through Single-Molecule Visualization
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A Simple, Robust, and High Throughput Single Molecule Flow Stretching Assay Implementation for Studying Transport of Molecules Along DNA
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科学领域:

  • 统计力学就是统计力学.
  • 生物物理学的生物物理.
  • 软物质物理学 软物质物理学

背景情况:

  • 一个简化的拉链模型代表生物结构,如DNA和RNA针头.
  • 这些系统在热波动和外力下进行分析.

研究的目的:

  • 介绍和分析DNA和RNA发针结构的拉链模型.
  • 研究在外力和温度下的相位过渡和工作分布.
  • 为长度和工作分布提供分析表达式.

主要方法:

  • 开发了一种拉链模型,与热浴和外部力量相结合.
  • 在热力学极限中的自由长度分布P (L) 的分析计算.
  • 在使用线性力协议的准静态过程中,推导工作分布P(W).

主要成果:

  • 一个第一阶段的拉链-解锁相位过渡发生在一个临界力f_{c}(T).
  • 自由长度分布P (L) 显示了临界力以下,临界力和临界力以上的力有明显的定性差异.
  • 为工作分布P(W) 衍生出分析表达式,并对大偏差的数值模拟进行验证.

结论:

  • 拉链模型有效地捕捉了生物巨分子中的相变.
  • 对长度和工作分布的分析预测是准确的,即使对于极小的概率.
  • 这项研究为了解生物聚合物中强力诱导过渡的统计力学提供了一个框架.