在siRNA指南链中的5'-酸有机基:在Argonaute 2中控制定和代谢稳定的结构功能关系
bioRxiv : the preprint server for biology
|February 23, 2026
概括
新的5'-酸盐模仿剂通过增强Argonaute2结合来稳定RNA干扰的导向链. 这些修改后的模仿物抵御退化,提高了治疗潜力.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 化学生物学 化学生物学
背景情况:
- 有效的RNA干扰 (RNAi) 取决于引导链加载到Argonaute2 (AGO2),需要5'-酸盐 (5'-P).
- 在体内,5'-P是代谢不稳定的,限制了RNAi的有效性.
- 对与AGO2和降解酶相互作用的5'-P模拟物的结构理解尚不完整.
研究的目的:
- 系统地合成和表征新的有机5'-酸盐 (5'-POR) 模仿剂.
- 为了研究AGO2相互作用和对酶降解的抵抗的结构基础.
- 扩大5'-P模拟的化学空间,以改善RNAi疗法.
主要方法:
- 一个由35种5'-酸有机衍生物 (5'-POR) 组成的多样化面板的合成和表征.
- 在细胞测定中评估AGO2兼容性.
- 对酸酶和5'-外核酶降解的耐药性的评估.
- 在AGO2.2内的5'-PO-PhPrp导线的X射线晶体学.
主要成果:
- 甲基 (Me) 和基 (PhPrp) 替代的5'-POR模仿物被AGO2耐受得很好.
- 5'-酸 (5'-PS) 和5'-酸 (5'-MsPA) 也显示出AGO2的兼容性.
- 所有测试的模仿剂都抵抗酸酶降解;5'-POR和5'-PS-PhPrp抵抗5'-外核酶.
- 晶体结构揭示了PhPrp和AGO2 MID域疏水口袋之间的π-π相互作用.
结论:
- 有机5'-酸盐模仿剂为导丝提供了增强的代谢稳定性.
- 这些模仿者通过新的疏水和π-π相互作用来改善AGO2的定.
- 这些发现为开发更有效的基于RNAi的疗法提供了新的策略.
相关概念视频
RNA Stability
35.9K
Intact DNA strands can be found in fossils, while scientists sometimes struggle to keep RNA intact under laboratory conditions. The structural variations between RNA and DNA underlie the differences in their stability and longevity. Because DNA is double-stranded, it is inherently more stable. The single-stranded structure of RNA is less stable but also more flexible and can form weak internal bonds. Additionally, most RNAs in the cell are relatively short, while DNA can be up to 250 million...
35.9K
Nucleic Acid Structure
9.6K
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...
DNA Structure
DNA...
9.6K
RNA Structure
7.9K
The basic structure of RNA consists of a string of ribonucleotides attached by phosphodiester bonds. 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) involved in protein synthesis: messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). All three...
Different Types of RNA Have the Same Basic Structure
There are three main types of ribonucleic acid (RNA) involved in protein synthesis: messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). All three...
7.9K
RNA Structure
79.4K
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...
79.4K
Conservation of Protein Domains Over Different Proteins
14.8K
Protein domains are small structurally independent units that are part of a single amino acid chain. Although these domains are often structurally independent, they may rely on synergistic effects to perform their functions as part of a larger protein. Protein domains may be conserved within the same organism, as well as across different organisms.
A limited set of protein domains often duplicate and recombine during evolution. These domains can be organized in different combinations to...
A limited set of protein domains often duplicate and recombine during evolution. These domains can be organized in different combinations to...
14.8K
mRNA Stability and Gene Expression
6.7K
The structure and stability of mRNA molecules regulates gene expression, as mRNAs are a key step in the pathway from gene to protein. In eukaryotes, the half-life of mRNA varies from a few minutes up to several days. mRNA stability is essential in growth and development. The absence of the proteins regulating its stability, such as tristetraprolin in mice, can cause systemic issues, including bone marrow overgrowth, inflammation, and autoimmunity.
Cis-acting Elements involved in mRNA stability
Cis-acting Elements involved in mRNA stability
6.7K


