热力学不稳定性和结构适应性2'-Alkoxy/Fluoro-N3-甲基胺核酸在siRNA增强RNA干扰活动
Avijit Sahoo1, Shalini Gupta2, Gourav Das1
1Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur, West Bengal 721302, India.
Journal of medicinal chemistry
|July 30, 2025
概括
小型干扰RNAs (siRNAs) 中的新型2'-alkoxy/fluoro-m3C修饰增强了RNA干扰 (RNAi) 的活性和稳定性. 这些修改后的siRNAs显示出改善的核酶抗性,并保持无免疫刺激作用的沉默效果.
科学领域:
- 核酸化学的核酸化学
- 分子生物学分子生物学
- 生物化学 生物化学
背景情况:
- 小干扰RNAs (siRNAs) 对于基因沉默至关重要.
- 化学修改可以提高siRNA的稳定性和有效性.
- 了解修改对siRNA结构和功能的影响对于治疗开发至关重要.
研究的目的:
- 为了合成和评估2个ac-alkoxy/fluoro-m3C色胺酸,用于siRNA的整合.
- 评估这些修改对siRNA热稳定性,核酶抵抗性和RNA干扰 (RNAi) 活性的影响.
- 通过分子建模研究这些修饰的结构基础和功能后果.
主要方法:
- 合成了2个ac-alkoxy/fluoro-m3C的酸.
- 改造核酸的纳入siRNAs.
- 热变质化研究 (Tm分析).
- 外核酶抗性测试. 外核酶抗性测试.
- 基因沉默测试 (RNAi活动).
- 对siRNA-蛋白相互作用的分子建模 (hAgo2 MID域).
主要成果:
- 中心修改导致热不稳定,原因是破坏了结.
- 2ac-alkoxy-m3C增强了对5ac-和3ac-外核酶的抗性.
- 在特定位置的内置 (乘客链切割,3ac-end) 将RNAi活性增加了约2倍.
- 在g7位置的修改 (种子不匹配) 保持了沉默功效.
- 没有观察到不良的免疫刺激反应,细胞毒性或生物可用性丧失.
结论:
- 2 ac-alkoxy/fluoro-m3C 修改是提高siRNA疗法的有希望的策略.
- 这些修改改善了siRNA的稳定性和功效,同时保持了有利的安全性.
- 来自分子建模的结构洞察力解释了这些修改的功能结果.
更多相关视频
09:20Identification of RNA Fragments Resulting from Enzymatic Degradation using MALDI-TOF Mass Spectrometry
Published on: April 11, 2022
3.4K
09:04Sequence-specific and Selective Recognition of Double-stranded RNAs over Single-stranded RNAs by Chemically Modified Peptide Nucleic Acids
Published on: September 21, 2017
9.6K
相关概念视频
RNA Stability
33.9K
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...
33.9K
RNA Interference
26.5K
RNA interference (RNAi) is a process in which a small non-coding RNA molecule blocks the post-transcriptional expression of a gene by binding to its messenger RNA (mRNA) and preventing the protein from being translated.
This process occurs naturally in cells, often through the activity of genomically-encoded microRNAs. Researchers can take advantage of this mechanism by introducing synthetic RNAs to deactivate specific genes for research or therapeutic purposes. For example, RNAi could be used...
This process occurs naturally in cells, often through the activity of genomically-encoded microRNAs. Researchers can take advantage of this mechanism by introducing synthetic RNAs to deactivate specific genes for research or therapeutic purposes. For example, RNAi could be used...
26.5K
Translational Regulation
98
Translational regulation in prokaryotes ensures efficient protein synthesis by controlling ribosome access to mRNA. This regulation is mediated by secondary RNA structures, including translational riboswitches, RNA thermometers, and small RNAs (sRNAs), which respond to intracellular and environmental signals to modulate gene expression.Translational RiboswitchesRiboswitches in the leader region of mRNAs can regulate translation by altering the accessibility of the Shine-Dalgarno (SD) sequence,...
98
Types of RNA
64.9K
Overview
Three main types of RNA are involved in protein synthesis: messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). These RNAs perform diverse functions and can be broadly classified as protein-coding or non-coding RNA. Non-coding RNAs play important roles in the regulation of gene expression in response to developmental and environmental changes. Non-coding RNAs in prokaryotes can be manipulated to develop more effective antibacterial drugs for human or animal use.
RNA...
Three main types of RNA are involved in protein synthesis: messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). These RNAs perform diverse functions and can be broadly classified as protein-coding or non-coding RNA. Non-coding RNAs play important roles in the regulation of gene expression in response to developmental and environmental changes. Non-coding RNAs in prokaryotes can be manipulated to develop more effective antibacterial drugs for human or animal use.
RNA...
64.9K
mRNA Stability and Gene Expression
5.7K
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
5.7K
siRNA - Small Interfering RNAs
17.0K
Small interfering RNAs, or siRNAs, are short regulatory RNA molecules that can silence genes post-transcriptionally, as well as the transcriptional level in some cases. siRNAs are important for protecting cells against viral infections and silencing transposable genetic elements.
In the cytoplasm, siRNA is processed from a double-stranded RNA, which comes from either endogenous DNA transcription or exogenous sources like a virus. This double-stranded RNA is then cleaved by the...
In the cytoplasm, siRNA is processed from a double-stranded RNA, which comes from either endogenous DNA transcription or exogenous sources like a virus. This double-stranded RNA is then cleaved by the...
17.0K
