相关实验视频

Updated: May 2, 2026

DNA Nanotubes as a Versatile Tool to Study Semiflexible Polymers

DNA Nanotubes as a Versatile Tool to Study Semiflexible Polymers

Published on: October 25, 2017

凝聚DNA聚合物刷的树突和纳米线组件

Dan Bracha¹, Roy H Bar-Ziv

¹Department of Materials and Interfaces, The Weizmann Institute of Science , Rehovot 76100, Israel.

Journal of the American Chemical Society

|March 7, 2014

概括

当DNA聚合物刷子暴露于三价子阴离子的精子胺时,它们会凝结成碎形域. 这个由DNA密度控制的过程为基于DNA的合成系统和DNA事务的空间调节提供了新的方法.

科学领域:

生物物理学的生物物理.
材料科学材料科学材料科学
纳米技术纳米技术

背景情况:

DNA聚合物刷在生物系统和纳米技术中至关重要.
了解DNA结构变化是控制其行为的关键.
众所周知,精子胺可诱导DNA的凝结.

研究的目的:

为了研究DNA聚合物刷子对精子胺诱导的凝结的集体形状反应.
为了探索DNA刷崩的机制和特征.
评估对DNA凝聚的空间控制的潜力.

主要方法:

使用了千基基对长度的DNA聚合物刷子.
使用三价定子精氨酸的诱导凝结.
分析过渡使用技术观察碎形树突形态和相位过渡的标志.
操纵DNA密度和表面图案以控制核和生长.

主要成果:

DNA刷转化为宏观领域,具有碎形树突形态.
凝结是通过焦点核形成启动的,并以连锁反应级联的方式传播.
过渡显示了第一阶段过渡的特征,包括hysteresis.
扩展的DNA构造对于树突域形成至关重要.
确定了关键的DNA密度,在此以上,核和生长率急剧增加.
通过模拟DNA刷来实现对凝结的空间控制,从而使纳米线形成.

结论:

DNA凝结是一种可控制的过程,在合成系统中具有潜在的应用.
DNA密度是调节DNA凝结的一个关键因素.
精子胺诱导的DNA刷凝结为构建基于DNA的材料提供了一个新的工具.
这些发现表明,DNA架构蛋白对DNA交易调节的潜在体内机制.
凝结的空间控制为制造纳米级DNA结构提供了一种方法.

更多相关视频

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

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

Published on: April 12, 2019

Self-assembly of Complex Two-dimensional Shapes from Single-stranded DNA Tiles

Self-assembly of Complex Two-dimensional Shapes from Single-stranded DNA Tiles

Published on: May 8, 2015

相关概念视频

Assembly of Complex Microtubule Structures

Assembly of Complex Microtubule Structures

Complex microtubule structures are present in resting cells and in dividing cells. In resting cells, they are responsible for maintaining the cellular architecture, tracks for intracellular transport, positioning of organelles, assembly of cilia and flagella. They mediate the bipolar spindle assembly for chromosomal segregation and positioning of the cell division plate in dividing cells. The formation of microtubule complex structures depends on the cell type, cell stage, and cell function.

Chromatin Packaging

Chromatin Packaging

Each human somatic cell contains 6 billion base pairs of DNA. Each base pair is 0.34 nm long, meaning each diploid cell contains a staggering 2 meters of DNA. This long DNA strand is packed inside a nucleus measuring only 10-20 microns in diameter with the help of specialized DNA-binding proteins called histones. Together they form a compact DNA-protein complex called chromatin. The chromatin is further compacted into higher-order structures. The highest level of compaction is achieved during...

Chromatin Packaging

Chromatin Packaging

Each human somatic cell contains 6 billion base-pairs of DNA. Each base-pair is 0.34 nm long, which means that each diploid cell contains a staggering 2 meters of DNA. How is such a long DNA strand packed inside a nucleus measuring only 10 - 20 microns in diameter?
The chromatin
In combination with specialized DNA binding protein called Histones, the DNA double helix forms a compact DNA: protein complex called chromatin. The chromatin itself is further compacted into higher-order...

DNA Packaging

DNA Packaging

The DNA Helix

The DNA Helix

Deoxyribonucleic acid, or DNA, is the genetic material responsible for passing traits from generation to generation in all organisms and most viruses. DNA is composed of two strands of nucleotides that wind around each other to form a spring-like structure called a double helix. However, the double helix is not perfectly symmetrical. Instead, there are regularly occurring grooves in the structure. The major groove occurs where the sugar-phosphate backbones are relatively far apart. This space...

The DNA Helix

The DNA Helix