基于纳米孔的实时单分子探测i-Motif结构动力学和有针对性的PNA破坏
Adina Cimpanu1, Jonggwan Park2, Loredana Mereuta1
1Department of Physics, Alexandru I. Cuza University, 700506 Iasi, Romania.
Nano letters
|February 2, 2026
概括
我们开发了一种纳米孔方法来研究DNAi-motifs,揭示了不同的折叠行为. 这种技术可以监测i-motif动态和相互作用,为针对基因调节的新治疗策略铺平了道路.
科学领域:
- 生物物理学的生物物理.
- 纳米技术纳米技术
- 基因组学就是基因组学.
背景情况:
- i-motif是一个非正规的DNA结构,对基因调节至关重要.
- 探测i-motif动力学和相互作用仍然是分子生物学中的一个重大挑战.
研究的目的:
- 开发一种单分子方法来感知人类端粒i-motif折叠和动态.
- 为了研究核酸 (PNA) 与i-motifs的相互作用.
主要方法:
- 使用野生类型的α-hemolysin (α-HL) 纳米孔检测i-motif折叠事件.
- 描述了两个不同的传感范式:来自碰撞的短暂电流签名和来自前厅陷的准永久封锁.
- 采用6分子核酸 (PNA) 作为反意义开关来破坏i动机的稳定性.
主要成果:
- 证明了i-motif动态的两个不同的纳米孔传感模式:碰撞和前厅第一入口.
- 实现了纳米孔内pH取决体积变化的高分辨率 (nm3尺度) 监测.
- 展示了PNA在可控地入侵和破坏i-motifs的能力,特别是在绑定之前折叠时.
结论:
- 建立了一个强大的单分子工具,用于研究i-motif结构及其相互作用.
- 突出了针对i-motif介导基因调控元素的PNA设计原则.
- 开辟了开发基于i-motif调制的治疗策略的新途径.
相关概念视频
Real Time RT-PCR
65.1K
Real-time reverse transcription-polymerase chain reaction, or Real-time RT-PCR, is an analytical tool used to determine the expression level of target genes. The method involves converting mRNA to complementary DNA with the help of an enzyme known as reverse transcriptase, followed by the PCR amplification of the cDNA. These two processes can be performed simultaneously in a single tube or separately as a two-step reaction.
The real-time quantification of the number of amplified products is...
The real-time quantification of the number of amplified products is...
65.1K
Structures of Solids
17.7K
Solids in which the atoms, ions, or molecules are arranged in a definite repeating pattern are known as crystalline solids. Metals and ionic compounds typically form ordered, crystalline solids. A crystalline solid has a precise melting temperature because each atom or molecule of the same type is held in place with the same forces or energy. Amorphous solids or non-crystalline solids (or, sometimes, glasses) which lack an ordered internal structure and are randomly arranged. Substances that...
17.7K
Additional Subnuclear Structures
5.4K
The eukaryotic nucleus is a double membrane-bound organelle that contains nearly all of the cell’s genetic material in the form of chromosomes. It is rightly called the “brain” of the cell as it shoulders the responsibility of responding to various physiological processes, stress, altered metabolic conditions, and other cellular signals.
The nucleus contains many membrane-less subnuclear organelles or nuclear bodies, such as nucleoli, Cajal bodies, speckles,...
The nucleus contains many membrane-less subnuclear organelles or nuclear bodies, such as nucleoli, Cajal bodies, speckles,...
5.4K
Structure of Lipids
98.8K
Lipids include a diverse group of compounds that are largely nonpolar in nature. This is because they are hydrocarbons that include mostly nonpolar carbon-carbon or carbon-hydrogen bonds. Non-polar molecules are hydrophobic (“water fearing”), or insoluble in water. Lipids perform many different functions in a cell. Cells store energy for long-term use in the form of fats. Lipids also provide insulation from the environment for plants and animals. For example, they help keep aquatic...
98.8K
RNA Structure
79.1K
Overview
The basic structure of RNA consists of a five-carbon sugar and one of four nitrogenous bases. Although most RNA is single-stranded, it can form complex secondary and tertiary structures. Such structures play essential roles in the regulation of transcription and translation.
Different Types of RNA Have the Same Basic Structure
There are three main types of ribonucleic acid (RNA): messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). All three RNA types consist of a...
The basic structure of RNA consists of a five-carbon sugar and one of four nitrogenous bases. Although most RNA is single-stranded, it can form complex secondary and tertiary structures. Such structures play essential roles in the regulation of transcription and translation.
Different Types of RNA Have the Same Basic Structure
There are three main types of ribonucleic acid (RNA): messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). All three RNA types consist of a...
79.1K
Molecules and Compounds
68.7K
Atoms and Molecules
68.7K


