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相关概念视频

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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DNA Packaging

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Molecular Shape and Polarity

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Dipole Moment of a Molecule
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The intrinsic polarity of cells can be primarily attributed to two factors- i) the asymmetric accumulation of mobile components such are regulatory molecules and subcellular components across the cell and ii) the orientation of polar cytoskeletal filaments that make up the cytoskeletal networks, specifically microfilaments, and microtubules arranged along the axis of polarity. Interactions between the cytoskeletal filaments are crucial for the establishment and maintenance of the polar nature...
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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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相关实验视频

Updated: Sep 9, 2025

Stable DNA Motifs, 1D and 2D Nanostructures Constructed from Small Circular DNA Molecules
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Stable DNA Motifs, 1D and 2D Nanostructures Constructed from Small Circular DNA Molecules

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在DNA微圆中可视化极形方向

Tony Lemos1, Harold D Kim1

  • 1School of Physics, Georgia Institute of Technology, Atlanta, GA 30332-0430, USA.

bioRxiv : the preprint server for biology
|September 2, 2025
PubMed
概括
此摘要是机器生成的。

研究人员通过实验证实了DNA微圆采用特定的内向外方向,称为极形方向. 这一发现使用原子力显微镜可视化,验证了DNA微圆动态的理论预测.

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Magnetic Tweezers for the Measurement of Twist and Torque
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相关实验视频

Last Updated: Sep 9, 2025

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科学领域:

  • 分子生物学
  • 生物物理
  • 结构生物学

背景情况:

  • 从短双链DNA (dsDNA) 结合的端到端形成DNA小圈.
  • 理论模型预测依赖于序列的非均曲动能导致DNA小圆采用偏好的极形方向.
  • 这种预测的DNA小圆方向的实验证据一直缺乏.

研究的目的:

  • 通过实验可视化和确认DNA小圆的偏角方向.
  • 提供支持DNA小圆结构理论预测的经验证据.
  • 为了研究特定序列的DNA小圆形状.

主要方法:

  • 使用原子力显微镜 (AFM) 开发单分子方法.
  • 用单个生物素标记在不同的位置构建DNA微圆.
  • 与DNA小圈相对的生物结NeutrAvidin的成像以确定方向.
  • 使用粗粒模拟模型并与实验结果进行比较.

主要成果:

  • 通过NeutrAvidin位置的相位变化,观察到两种不同的DNA序列的分离方向.
  • AFM结果与粗粒度模拟结果一致,这些模拟结果显示了狭窄分布的极形方向.
  • 实验数据证实了DNA小圆的预测依赖序列的偏好方向.

结论:

  • 这项研究首次实验证实了DNA迷你圆的偏向.
  • 这些发现为循环DNA的内在动力学和形状偏好提供了宝贵的见解.
  • 这项研究弥合了DNA结构生物学中的理论预测和实验观察之间的差距.