相关实验视频
Updated: Jul 22, 2026

10:23
Self-assembly of Complex Two-dimensional Shapes from Single-stranded DNA Tiles
Published on: May 8, 2015
单个DNA复合体的分子结构具有带正电荷的树状聚合物
Illdiko Gössl1, Lijin Shu, A Dieter Schlüter
1Department of Physics, Humboldt University Berlin, 10099 Berlin, Germany.
Journal of the American Chemical Society
|June 13, 2002
概括
带正电荷的树化聚合物与DNA复合,形成圆柱形的纳米物体. DNA包裹在这些聚合物周围,显示出非病毒基因传递系统的潜力.
科学领域:
- 聚合物化学 聚合物化学
- 纳米技术纳米技术
- 生物物理学的生物物理.
背景情况:
- 凝结聚合物是圆柱状的纳米物体,具有可调节的半径和电荷密度.
- 这些聚合物具有质子胺组,导致正电荷.
- 与DNA的复合是潜在的基因传递应用的关键步骤.
研究的目的:
- 为了研究DNA与不同代的树聚合物的复杂化.
- 分析这些DNA聚合物复合物的结构特征.
- 评估这些复合体作为非病毒基因传递系统的潜力.
主要方法:
- 合成具有不同树突代的正电荷树突化聚合物.
- 聚合物的复合与DNA.
- 复合物的吸附在基板上.
- 使用扫描力显微镜 (SFM) 进行分析.
主要成果:
- DNA围绕着树化聚合物,形成复合物.
- 包裹DNA的距离被测定为2.30 ± 0.27 nm (第二代) 和2.16 ± 0.27 nm (第四代).
- DNA-dendronized聚合物复合物 (第二代) 呈现出负电荷,支持自发过电的理论.
结论:
- 凝结聚合物有效地与DNA复合,形成有序的结构.
- 观察到的DNA包裹和过电现象对宏分子复杂设计具有重要意义.
- 这些DNA-dendronized聚合物复合物显示出开发先进的非病毒基因传递载体的前景.
相关概念视频
The DNA Helix
Overview
The DNA Helix
Overview
Noncovalent Attractions in Biomolecules
Noncovalent attractions are associations within and between molecules that influence the shape and structural stability of complexes. These interactions differ from covalent bonding in that they do not involve sharing of electrons.
Four types of noncovalent interactions are hydrogen bonds, van der Waals forces, ionic bonds, and hydrophobic interactions.
Hydrogen bonding results from the electrostatic attraction of a hydrogen atom covalently bonded to a strong-electronegative atom like oxygen,...
Four types of noncovalent interactions are hydrogen bonds, van der Waals forces, ionic bonds, and hydrophobic interactions.
Hydrogen bonding results from the electrostatic attraction of a hydrogen atom covalently bonded to a strong-electronegative atom like oxygen,...
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...
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...
Nucleic Acid Structure
The pentose sugar in DNA is deoxyribose, while in RNA the pentose sugar is ribose. The difference between the sugars is the presence of the hydroxyl group on the ribose's second carbon and a hydrogen on the deoxyribose's second carbon. The phosphate residue attaches to the hydroxyl group of the 5′ carbon of one sugar and the hydroxyl group of the 3′ carbon of the sugar of the next nucleotide, which forms a 5′ to 3′ phosphodiester linkage.
DNA Structure
DNA has a double-helix structure. The...
DNA Structure
DNA has a double-helix structure. The...

