相关实验视频

Updated: May 10, 2025

Tools to Study the Role of Architectural Protein HMGB1 in the Processing of Helix Distorting, Site-specific DNA Interstrand Crosslinks

Tools to Study the Role of Architectural Protein HMGB1 in the Processing of Helix Distorting, Site-specific DNA Interstrand Crosslinks

Published on: November 10, 2016

奥利戈利增强和抑制DNA凝聚物的形成

Hiroaki Ohno¹, Junko Kijima², Yosuke Ochi³

¹Department of Intelligent and Control Systems, Kyushu Institute of Technology 680-4 Kawazu, Iizuka, Fukuoka 820-8502, Japan.

|April 28, 2025

概括

阴离子寡聚氨酸可以增强或抑制DNA纳米结构的凝结物形成. 这些效应取决于素电荷 (L/P比) 和长度,为设计人工生物分子凝聚剂提供了洞察力.

科学领域:

生物分子化学生物分子化学
纳米技术纳米技术
合成生物学合成生物学

背景情况:

生物分子凝聚物通过相位分离形成,对细胞功能至关重要.
设计的DNA纳米结构允许研究凝结物形成机制和创造人工凝结物.
在形成DNA纳米结构成凝聚物方面存在挑战,这促使对混合系统的研究.

研究的目的:

通过使用Y形DNA纳米结构,研究阴离子寡聚氨酸对DNA凝聚物形成的影响.
确定电荷比率 (L/P) 和寡聚氨酸残留数如何影响DNA凝聚剂组件.
探索DNA/混合凝聚物的潜力,用于人工细胞和分子机器人的应用.

主要方法:

组装的Y形DNA纳米结构.
引入具有不同残留数量的阴离子寡聚氨酸.
在不同素与酸盐 (L/P) 比率下对凝结物形成的分析.
对纳米结构完整性和特定序列相互作用的评估.

主要成果:

寡聚氨酸在最佳L/P比率下增强了DNA凝聚物形成,五种残留寡聚氨酸保留了DNA序列相互作用.
相反,其他L/P比率和残留物数量导致了抑制凝结物形成.
纳米结构由寡聚氨酸的变形被确定为抑制的原因.
酸的数量和长度都显著影响了分支DNA纳米结构的自我组装.

结论:

这项研究强调了阴性特性 (数量和长度) 在调节DNA纳米结构自我组装和凝结物形成中的关键作用.
这些发现为设计先进的DNA/混合凝聚剂提供了指导.
这项研究有助于开发功能性人工冷凝剂,用于合成生物学和纳米技术的应用.

更多相关视频

Gene-therapy Inspired Polycation Coating for Protection of DNA Origami Nanostructures

Gene-therapy Inspired Polycation Coating for Protection of DNA Origami Nanostructures

Published on: January 19, 2019

Chemical Dimerization-Induced Protein Condensates on Telomeres

Chemical Dimerization-Induced Protein Condensates on Telomeres

Published on: April 12, 2021

相关概念视频

DNA Topoisomerases

DNA Topoisomerases

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. ...

Condensins

Condensins

Condensins are large protein complexes that use ATP to fuel the assembly of chromosomes during mitosis. They transform the tangled, shapeless mass of post-interphase DNA into individualized chromosomes by compacting, organizing, and segregating chromosomal DNA.
The plant and animal cells contain two types of condensin complexes—condensin I and condensin II. Both complexes have five subunits: two SMC (Structural Maintenance of Chromosomes) subunits, a kleisin subunit, and two HEAT-repeat...

Single-Strand DNA Binding Proteins

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...

Translesion DNA Polymerases

Translesion DNA Polymerases

Translesion (TLS) polymerases rescue stalled DNA polymerases at sites of damaged bases by replacing the replicative polymerase and installing a nucleotide across the damaged site. Doing so, TLS allows additional time for the cell to repair the damage before resuming regular DNA replication.
TLS polymerases are found in all three domains of life - archaea, bacteria, and eukaryotes. Of the different classes of TLS polymerases, members of the Y family are fitted with specialized structures that...

Homologous Recombination

Homologous Recombination

The basic reaction of homologous recombination (HR) involves two chromatids that contain DNA sequences sharing a significant stretch of identity. One of these sequences uses a strand from another as a template to synthesize DNA in an enzyme-catalyzed reaction. The final product is a novel amalgamation of the two substrates. To ensure an accurate recombination of sequences, HR is restricted to the S and G2 phases of the cell cycle. At these stages, the DNA has been replicated already and the...

Nucleic Acid Structure

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...